diff --git a/src/main/java/cor/Filter.java b/src/main/java/cor/Filter.java
new file mode 100644
index 0000000..69d6a05
--- /dev/null
+++ b/src/main/java/cor/Filter.java
@@ -0,0 +1,5 @@
+package cor;
+
+public interface Filter {
+    void doFilter(Request request, Response response, FilterChain chain);
+}
diff --git a/src/main/java/cor/FilterChain.java b/src/main/java/cor/FilterChain.java
new file mode 100644
index 0000000..1cbbbc8
--- /dev/null
+++ b/src/main/java/cor/FilterChain.java
@@ -0,0 +1,21 @@
+package cor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class FilterChain{
+    List<Filter> filters = new ArrayList<>();
+    int index = 0;
+
+    public FilterChain add (Filter filter) {
+        filters.add(filter);
+        return this;
+    }
+
+    public void doFilter(Request request, Response response) {
+        if(index == filters.size()) return;
+        Filter f = filters.get(index);
+        index++;
+        f.doFilter(request, response, this);
+    }
+}
diff --git a/src/main/java/cor/HtmlFilter.java b/src/main/java/cor/HtmlFilter.java
new file mode 100644
index 0000000..cd5e684
--- /dev/null
+++ b/src/main/java/cor/HtmlFilter.java
@@ -0,0 +1,11 @@
+package cor;
+
+public class HtmlFilter implements Filter{
+
+    @Override
+    public void doFilter(Request request, Response response, FilterChain chain) {
+        request.req = request.req.replaceAll("<","[").replaceAll(">","]") + "-HtmlFilter";
+        chain.doFilter(request, response);
+        response.res += " -- HtmlFilter";
+    }
+}
diff --git a/src/main/java/cor/Main.java b/src/main/java/cor/Main.java
new file mode 100644
index 0000000..0d6425c
--- /dev/null
+++ b/src/main/java/cor/Main.java
@@ -0,0 +1,20 @@
+package cor;
+
+/*
+* .
+* 完全模拟servlet filterChain
+*
+* */
+public class Main {
+    public static void main(String[] args) {
+        FilterChain filterChain = new FilterChain();
+        Request request = new Request();
+        request.req = "大家好,<script> 欢迎来到996的公司.";
+        Response response = new Response();
+        response.res = "R";
+        filterChain.add(new HtmlFilter()).add(new SensitiveFilter());
+        filterChain.doFilter(request, response);
+        System.out.println(request.req);
+        System.out.println(response.res);
+    }
+}
diff --git a/src/main/java/cor/Request.java b/src/main/java/cor/Request.java
new file mode 100644
index 0000000..3466238
--- /dev/null
+++ b/src/main/java/cor/Request.java
@@ -0,0 +1,5 @@
+package cor;
+
+public class Request {
+    String req;
+}
diff --git a/src/main/java/cor/Response.java b/src/main/java/cor/Response.java
new file mode 100644
index 0000000..924456e
--- /dev/null
+++ b/src/main/java/cor/Response.java
@@ -0,0 +1,5 @@
+package cor;
+
+public class Response {
+    String res;
+}
diff --git a/src/main/java/cor/SensitiveFilter.java b/src/main/java/cor/SensitiveFilter.java
new file mode 100644
index 0000000..2a8d89c
--- /dev/null
+++ b/src/main/java/cor/SensitiveFilter.java
@@ -0,0 +1,11 @@
+package cor;
+
+public class SensitiveFilter implements Filter{
+
+    @Override
+    public void doFilter(Request request, Response response, FilterChain chain) {
+        request.req = request.req.replaceAll("996", "955") + "-sensitiveFilter";
+        chain.doFilter(request, response);
+        response.res += " -- sensitiveFilter";
+    }
+}