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793 lines
20 KiB
793 lines
20 KiB
# Spring HandlerMapping
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- Author: [HuiFer](https://github.com/huifer)
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- 源码阅读仓库: [SourceHot-spring](https://github.com/SourceHot/spring-framework-read)
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- 源码路径: `org.springframework.jms.annotation.EnableJms`
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- `org.springframework.web.servlet.HandlerMapping`
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- HandlerMapping 处理映射关系, 通过请求转换成对象`HandlerExecutionChain`
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```java
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public interface HandlerMapping {
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HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception;
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// 其他静态变量省略
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}
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```
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```java
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@Override
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@Nullable
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public final HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
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// 转换成handler
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Object handler = getHandlerInternal(request);
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if (handler == null) {
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// 获取默认的 handler
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handler = getDefaultHandler();
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}
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if (handler == null) {
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return null;
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}
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// Bean name or resolved handler?
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if (handler instanceof String) {
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// handler 是beanName 直接从容器中获取
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String handlerName = (String) handler;
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handler = obtainApplicationContext().getBean(handlerName);
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}
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HandlerExecutionChain executionChain = getHandlerExecutionChain(handler, request);
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if (logger.isTraceEnabled()) {
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logger.trace("Mapped to " + handler);
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}
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else if (logger.isDebugEnabled() && !request.getDispatcherType().equals(DispatcherType.ASYNC)) {
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logger.debug("Mapped to " + executionChain.getHandler());
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}
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if (hasCorsConfigurationSource(handler) || CorsUtils.isPreFlightRequest(request)) {
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CorsConfiguration config = (this.corsConfigurationSource != null ? this.corsConfigurationSource.getCorsConfiguration(request) : null);
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CorsConfiguration handlerConfig = getCorsConfiguration(handler, request);
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config = (config != null ? config.combine(handlerConfig) : handlerConfig);
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executionChain = getCorsHandlerExecutionChain(request, executionChain, config);
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}
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return executionChain;
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}
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```
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- `getHandlerInternal`方法是一个抽象方法
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```JAVA
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@Nullable
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protected abstract Object getHandlerInternal(HttpServletRequest request) throws Exception;
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```
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存在的实现方法
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- 先看`org.springframework.web.servlet.handler.AbstractHandlerMethodMapping#getHandlerInternal`方法是怎么一回事.
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```java
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@Override
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protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {
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// 获取当前请求路径
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String lookupPath = getUrlPathHelper().getLookupPathForRequest(request);
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// 设置属性
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request.setAttribute(LOOKUP_PATH, lookupPath);
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// 上锁
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this.mappingRegistry.acquireReadLock();
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try {
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// 寻找 handler method
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HandlerMethod handlerMethod = lookupHandlerMethod(lookupPath, request);
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return (handlerMethod != null ? handlerMethod.createWithResolvedBean() : null);
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}
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finally {
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// 释放锁
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this.mappingRegistry.releaseReadLock();
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}
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}
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```
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## UrlPathHelper
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- 全路径:`org.springframework.web.util.UrlPathHelper`
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- 几个属性
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```java
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/**
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* 是否全路径标记
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*/
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private boolean alwaysUseFullPath = false;
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/**
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* 是否需要 decode
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*/
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private boolean urlDecode = true;
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private boolean removeSemicolonContent = true;
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/**
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* 默认的encoding编码格式
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*/
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private String defaultEncoding = WebUtils.DEFAULT_CHARACTER_ENCODING;
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```
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### getPathWithinApplication
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```java
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public String getPathWithinApplication(HttpServletRequest request) {
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// 获取 context path
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String contextPath = getContextPath(request);
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// 获取 uri
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String requestUri = getRequestUri(request);
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String path = getRemainingPath(requestUri, contextPath, true);
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if (path != null) {
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// Normal case: URI contains context path.
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return (StringUtils.hasText(path) ? path : "/");
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}
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else {
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return requestUri;
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}
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}
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```
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1. 从 request 中获取 context-path
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1. 从属性中直接获取
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2. 从request中调用 getContextPath 获取
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3. 判断是否是**`/`**
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4. decode request string
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2. 从 request 中虎丘 request-uri
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1. 从属性中获取
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2. 从 request 中调用 getRequestURI 获取
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3. decode
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3. 获取剩余路径
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### getContextPath
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- 获取 context-path 地址
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```java
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public String getContextPath(HttpServletRequest request) {
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// 从 request 获取 context path
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String contextPath = (String) request.getAttribute(WebUtils.INCLUDE_CONTEXT_PATH_ATTRIBUTE);
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if (contextPath == null) {
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contextPath = request.getContextPath();
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}
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if ("/".equals(contextPath)) {
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// Invalid case, but happens for includes on Jetty: silently adapt it.
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contextPath = "";
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}
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// decode context path
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return decodeRequestString(request, contextPath);
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}
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```
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### decodeRequestString
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- 判断是否需要编码, 需要编码就做编码操作，不需要就直接返回
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```java
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public String decodeRequestString(HttpServletRequest request, String source) {
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// 判断是否需要编码
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if (this.urlDecode) {
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// 进行编码
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return decodeInternal(request, source);
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}
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return source;
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}
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```
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### decodeInternal
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- 编码方法
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```java
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@SuppressWarnings("deprecation")
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private String decodeInternal(HttpServletRequest request, String source) {
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// 确定编码方式
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String enc = determineEncoding(request);
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try {
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// 将 source 编译成 enc 的编码方式
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return UriUtils.decode(source, enc);
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}
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catch (UnsupportedCharsetException ex) {
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if (logger.isWarnEnabled()) {
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logger.warn("Could not decode request string [" + source + "] with encoding '" + enc +
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"': falling back to platform default encoding; exception message: " + ex.getMessage());
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}
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// 直接编码,JDK底层编码
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return URLDecoder.decode(source);
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}
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}
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```
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### determineEncoding
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- 确认编码
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```java
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protected String determineEncoding(HttpServletRequest request) {
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// 从 request 中获取编码方式
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String enc = request.getCharacterEncoding();
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if (enc == null) {
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// 默认编码
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enc = getDefaultEncoding();
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}
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return enc;
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}
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```
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### getRequestUri
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- 获取 uri 地址
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```java
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public String getRequestUri(HttpServletRequest request) {
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// 从属性中获取
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String uri = (String) request.getAttribute(WebUtils.INCLUDE_REQUEST_URI_ATTRIBUTE);
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if (uri == null) {
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// 调用方法获取
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uri = request.getRequestURI();
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}
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//编码和清理数据
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return decodeAndCleanUriString(request, uri);
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}
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```
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### decodeAndCleanUriString
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- 编码和清理数据
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```java
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private String decodeAndCleanUriString(HttpServletRequest request, String uri) {
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// 去掉分号
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uri = removeSemicolonContent(uri);
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// decoding
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uri = decodeRequestString(request, uri);
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// 去掉 // 双斜杠
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uri = getSanitizedPath(uri);
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return uri;
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}
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```
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### shouldRemoveTrailingServletPathSlash
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- 是否删除 servlet path 后的斜杠
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- 默认是 false .
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- 代码流程
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1. 通过 classLoader 加载 `"com.ibm.ws.webcontainer.WebContainer"`
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2. 调用方法 `"getWebContainerProperties"`
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3. 从方法结果中取`"getWebContainerProperties"`
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```java
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private boolean shouldRemoveTrailingServletPathSlash(HttpServletRequest request) {
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if (request.getAttribute(WEBSPHERE_URI_ATTRIBUTE) == null) {
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// Regular servlet container: behaves as expected in any case,
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// so the trailing slash is the result of a "/" url-pattern mapping.
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// Don't remove that slash.
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return false;
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}
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Boolean flagToUse = websphereComplianceFlag;
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if (flagToUse == null) {
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ClassLoader classLoader = UrlPathHelper.class.getClassLoader();
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String className = "com.ibm.ws.webcontainer.WebContainer";
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String methodName = "getWebContainerProperties";
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String propName = "com.ibm.ws.webcontainer.removetrailingservletpathslash";
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boolean flag = false;
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try {
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Class<?> cl = classLoader.loadClass(className);
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Properties prop = (Properties) cl.getMethod(methodName).invoke(null);
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flag = Boolean.parseBoolean(prop.getProperty(propName));
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}
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catch (Throwable ex) {
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if (logger.isDebugEnabled()) {
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logger.debug("Could not introspect WebSphere web container properties: " + ex);
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}
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}
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flagToUse = flag;
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websphereComplianceFlag = flag;
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}
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// Don't bother if WebSphere is configured to be fully Servlet compliant.
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// However, if it is not compliant, do remove the improper trailing slash!
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return !flagToUse;
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}
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```
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### decodeMatrixVariables
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- 编码修改方法
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```java
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public MultiValueMap<String, String> decodeMatrixVariables(
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HttpServletRequest request, MultiValueMap<String, String> vars) {
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// 判断是否需要重写编码
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if (this.urlDecode) {
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return vars;
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}
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else {
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// 需要重写编码的情况
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MultiValueMap<String, String> decodedVars = new LinkedMultiValueMap<>(vars.size());
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// 循环, 将 value 调用decodeInternal写到结果map返回
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vars.forEach((key, values) -> {
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for (String value : values) {
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decodedVars.add(key, decodeInternal(request, value));
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}
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});
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return decodedVars;
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}
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}
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```
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- 与这个方法对应的还有`decodePathVariables`
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### decodePathVariables
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```java
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public Map<String, String> decodePathVariables(HttpServletRequest request, Map<String, String> vars) {
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// 判断是否需要重写编码
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if (this.urlDecode) {
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return vars;
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}
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else {
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Map<String, String> decodedVars = new LinkedHashMap<>(vars.size());
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// 虚幻 decoding
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vars.forEach((key, value) -> decodedVars.put(key, decodeInternal(request, value)));
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return decodedVars;
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}
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}
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```
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- 回到`org.springframework.web.servlet.handler.AbstractHandlerMethodMapping#getHandlerInternal`
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```JAVA
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String lookupPath = getUrlPathHelper().getLookupPathForRequest(request);
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```
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- 设置属性上锁开锁就不具体展开了.
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## lookupHandlerMethod
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- `org.springframework.web.servlet.handler.AbstractHandlerMethodMapping#lookupHandlerMethod` 方法
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- 第一部分
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```java
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@Nullable
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protected HandlerMethod lookupHandlerMethod(String lookupPath, HttpServletRequest request) throws Exception {
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List<Match> matches = new ArrayList<>();
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// 从 MultiValueMap 获取
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List<T> directPathMatches = this.mappingRegistry.getMappingsByUrl(lookupPath);
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// 如果不为空
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if (directPathMatches != null) {
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// 添加匹配映射
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addMatchingMappings(directPathMatches, matches, request);
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}
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if (matches.isEmpty()) {
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// No choice but to go through all mappings...
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// 添加匹配映射
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addMatchingMappings(this.mappingRegistry.getMappings().keySet(), matches, request);
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}
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//...
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}
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```
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- 创建一个匹配list,将匹配结果放入
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```
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List<Match> matches = new ArrayList<>();
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```
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- 从 map 中获取数据
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```
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List<T> directPathMatches = this.mappingRegistry.getMappingsByUrl(lookupPath);
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```
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```JAVA
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@Nullable
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public List<T> getMappingsByUrl(String urlPath) {
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return this.urlLookup.get(urlPath);
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}
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```
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urlLookup 是`MultiValueMap`接口.
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key:url value:mapping
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- addMatchingMappings 方法
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```java
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if (directPathMatches != null) {
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// 添加匹配映射
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addMatchingMappings(directPathMatches, matches, request);
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}
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if (matches.isEmpty()) {
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// No choice but to go through all mappings...
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// 添加匹配映射
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addMatchingMappings(this.mappingRegistry.getMappings().keySet(), matches, request);
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}
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```
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```java
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private void addMatchingMappings(Collection<T> mappings, List<Match> matches, HttpServletRequest request) {
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for (T mapping : mappings) {
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// 抽象方法
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// 通过抽象方法获取 match 结果
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T match = getMatchingMapping(mapping, request);
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// 是否为空
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if (match != null) {
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// 从 mappingLookup 获取结果并且插入到matches中
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matches.add(new Match(match, this.mappingRegistry.getMappings().get(mapping)));
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}
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}
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}
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```
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- `getMatchingMapping` 方法是一个抽象方法
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```java
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protected abstract T getMatchingMapping(T mapping, HttpServletRequest request);
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```
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- `org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping#getMatchingMapping`
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```java
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@Override
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protected RequestMappingInfo getMatchingMapping(RequestMappingInfo info, HttpServletRequest request) {
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return info.getMatchingCondition(request);
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}
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```
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- 第二部分
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```java
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if (!matches.isEmpty()) {
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// 比较对象
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Comparator<Match> comparator = new MatchComparator(getMappingComparator(request));
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// 排序
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matches.sort(comparator);
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// 获取第一个 match 对象
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Match bestMatch = matches.get(0);
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if (matches.size() > 1) {
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if (logger.isTraceEnabled()) {
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logger.trace(matches.size() + " matching mappings: " + matches);
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}
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if (CorsUtils.isPreFlightRequest(request)) {
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return PREFLIGHT_AMBIGUOUS_MATCH;
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}
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Match secondBestMatch = matches.get(1);
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if (comparator.compare(bestMatch, secondBestMatch) == 0) {
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// 拿出 handlerMethod 进行比较
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Method m1 = bestMatch.handlerMethod.getMethod();
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Method m2 = secondBestMatch.handlerMethod.getMethod();
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String uri = request.getRequestURI();
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throw new IllegalStateException(
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"Ambiguous handler methods mapped for '" + uri + "': {" + m1 + ", " + m2 + "}");
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}
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}
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request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, bestMatch.handlerMethod);
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handleMatch(bestMatch.mapping, lookupPath, request);
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return bestMatch.handlerMethod;
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}
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else {
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return handleNoMatch(this.mappingRegistry.getMappings().keySet(), lookupPath, request);
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}
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```
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- 一行行开始分析
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```java
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Comparator<Match> comparator = new MatchComparator(getMappingComparator(request));
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```
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- 抽象方法`getMappingComparator`
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```java
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protected abstract Comparator<T> getMappingComparator(HttpServletRequest request);
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```
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- 实现方法
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```java
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@Override
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protected Comparator<RequestMappingInfo> getMappingComparator(final HttpServletRequest request) {
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return (info1, info2) -> info1.compareTo(info2, request);
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}
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```
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内部定义了 compareTo 方法
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- 执行完成比较方法后创建对象`MatchComparator`
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- 对象创建后进行排序，排序后取出第一个元素作为后续操作的基准对象
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```java
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// 排序
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matches.sort(comparator);
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// 获取第一个 match 对象
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Match bestMatch = matches.get(0);
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```
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```java
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if (matches.size() > 1) {
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if (logger.isTraceEnabled()) {
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logger.trace(matches.size() + " matching mappings: " + matches);
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}
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// 是否跨域请求
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if (CorsUtils.isPreFlightRequest(request)) {
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return PREFLIGHT_AMBIGUOUS_MATCH;
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}
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// 取出第二个元素.
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Match secondBestMatch = matches.get(1);
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// 如果比较结果相同
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if (comparator.compare(bestMatch, secondBestMatch) == 0) {
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// 第二个元素和第一个元素的比较过程
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// 拿出 handlerMethod 进行比较
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Method m1 = bestMatch.handlerMethod.getMethod();
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Method m2 = secondBestMatch.handlerMethod.getMethod();
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String uri = request.getRequestURI();
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throw new IllegalStateException(
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"Ambiguous handler methods mapped for '" + uri + "': {" + m1 + ", " + m2 + "}");
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}
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}
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```
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- 取出第一个元素和第二个元素进行比较. 如果两个 match 相同, 出现异常
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最后两个方法
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```java
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// 设置属性
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request.setAttribute(BEST_MATCHING_HANDLER_ATTRIBUTE, bestMatch.handlerMethod);
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// 处理匹配的结果
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handleMatch(bestMatch.mapping, lookupPath, request);
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return bestMatch.handlerMethod;
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}
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else {
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// 处理没有匹配的结果
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return handleNoMatch(this.mappingRegistry.getMappings().keySet(), lookupPath, request);
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}
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```
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- `handleMatch`
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```java
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protected void handleMatch(T mapping, String lookupPath, HttpServletRequest request) {
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request.setAttribute(HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, lookupPath);
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}
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```
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设置一次属性
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这个方法子类会继续实现
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- `org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping#handleMatch`
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```java
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@Override
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protected void handleMatch(RequestMappingInfo info, String lookupPath, HttpServletRequest request) {
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super.handleMatch(info, lookupPath, request);
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String bestPattern;
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Map<String, String> uriVariables;
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// 匹配器
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Set<String> patterns = info.getPatternsCondition().getPatterns();
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// 如果空设置基本数据
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if (patterns.isEmpty()) {
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bestPattern = lookupPath;
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uriVariables = Collections.emptyMap();
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}
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else {
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// 取出一个匹配器
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bestPattern = patterns.iterator().next();
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// 地址匹配器比较 路由地址和匹配器比较
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uriVariables = getPathMatcher().extractUriTemplateVariables(bestPattern, lookupPath);
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}
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request.setAttribute(BEST_MATCHING_PATTERN_ATTRIBUTE, bestPattern);
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if (isMatrixVariableContentAvailable()) {
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// 处理多层参数, 带有;分号的处理
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Map<String, MultiValueMap<String, String>> matrixVars = extractMatrixVariables(request, uriVariables);
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request.setAttribute(HandlerMapping.MATRIX_VARIABLES_ATTRIBUTE, matrixVars);
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}
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// 编码url参数
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Map<String, String> decodedUriVariables = getUrlPathHelper().decodePathVariables(request, uriVariables);
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request.setAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, decodedUriVariables);
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if (!info.getProducesCondition().getProducibleMediaTypes().isEmpty()) {
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// 获取 media type
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Set<MediaType> mediaTypes = info.getProducesCondition().getProducibleMediaTypes();
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request.setAttribute(PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE, mediaTypes);
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}
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}
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```
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- `handleNoMatch` 也是同类型操作
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- `org.springframework.web.servlet.handler.AbstractHandlerMethodMapping#handleNoMatch`
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- `org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping#handleNoMatch`
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```java
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@Override
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protected HandlerMethod handleNoMatch(
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Set<RequestMappingInfo> infos, String lookupPath, HttpServletRequest request) throws ServletException {
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// 创建对象 PartialMatchHelper
|
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PartialMatchHelper helper = new PartialMatchHelper(infos, request);
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if (helper.isEmpty()) {
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return null;
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}
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// 函数是否匹配
|
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if (helper.hasMethodsMismatch()) {
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Set<String> methods = helper.getAllowedMethods();
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// 请求方式比较
|
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if (HttpMethod.OPTIONS.matches(request.getMethod())) {
|
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// handler 转换
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HttpOptionsHandler handler = new HttpOptionsHandler(methods);
|
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// 构建 handler method
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return new HandlerMethod(handler, HTTP_OPTIONS_HANDLE_METHOD);
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}
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throw new HttpRequestMethodNotSupportedException(request.getMethod(), methods);
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}
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|
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if (helper.hasConsumesMismatch()) {
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Set<MediaType> mediaTypes = helper.getConsumableMediaTypes();
|
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MediaType contentType = null;
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if (StringUtils.hasLength(request.getContentType())) {
|
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try {
|
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// 字符串转换成对象
|
|
contentType = MediaType.parseMediaType(request.getContentType());
|
|
}
|
|
catch (InvalidMediaTypeException ex) {
|
|
throw new HttpMediaTypeNotSupportedException(ex.getMessage());
|
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}
|
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}
|
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throw new HttpMediaTypeNotSupportedException(contentType, new ArrayList<>(mediaTypes));
|
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}
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|
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if (helper.hasProducesMismatch()) {
|
|
Set<MediaType> mediaTypes = helper.getProducibleMediaTypes();
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throw new HttpMediaTypeNotAcceptableException(new ArrayList<>(mediaTypes));
|
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}
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if (helper.hasParamsMismatch()) {
|
|
List<String[]> conditions = helper.getParamConditions();
|
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throw new UnsatisfiedServletRequestParameterException(conditions, request.getParameterMap());
|
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}
|
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|
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return null;
|
|
}
|
|
```
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