feat:optimize quickstart feign examples.

spring-cloud-tencent-examples/quickstart-example/quickstart-callee-service-a/src/main/java/com/tencent/cloud/quickstart/callee/QuickstartCalleeController.java

@@ -65,9 +65,9 @@ public class QuickstartCalleeController {
 	 * @return sum
 	 */
 	@GetMapping("/sum")
-	public int sum(@RequestParam int value1, @RequestParam int value2) {
+	public String sum(@RequestParam int value1, @RequestParam int value2) {
 		LOG.info("Quickstart Callee Service [{}:{}] is called and sum is [{}].", ip, port, value1 + value2);
-		return value1 + value2;
+		return String.format("Quickstart Callee Service [%s:%s] is called and sum is [%s].", ip, port, value1 + value2);
 	}
 
 	/**

spring-cloud-tencent-examples/quickstart-example/quickstart-callee-service-b/src/main/java/com/tencent/cloud/quickstart/callee/QuickstartCalleeController.java

@@ -69,9 +69,9 @@ public class QuickstartCalleeController {
 	 * @return sum
 	 */
 	@GetMapping("/sum")
-	public int sum(@RequestParam int value1, @RequestParam int value2) {
+	public String sum(@RequestParam int value1, @RequestParam int value2) {
 		LOG.info("Quickstart Callee Service [{}:{}] is called and sum is [{}].", ip, port, value1 + value2);
-		return value1 + value2;
+		return String.format("Quickstart Callee Service [%s:%s] is called and sum is [%s].", ip, port, value1 + value2);
 	}
 
 	/**

spring-cloud-tencent-examples/quickstart-example/quickstart-caller-service/src/main/java/com/tencent/cloud/quickstart/caller/QuickstartCalleeService.java

@@ -37,5 +37,5 @@ public interface QuickstartCalleeService {
 	 * @return sum
 	 */
 	@GetMapping("/quickstart/callee/sum")
-	int sum(@RequestParam("value1") int value1, @RequestParam("value2") int value2);
+	String sum(@RequestParam("value1") int value1, @RequestParam("value2") int value2);
 }

spring-cloud-tencent-examples/quickstart-example/quickstart-caller-service/src/main/java/com/tencent/cloud/quickstart/caller/QuickstartCalleeServiceFallback.java

@@ -28,7 +28,7 @@ import org.springframework.stereotype.Component;
 public class QuickstartCalleeServiceFallback implements QuickstartCalleeService {
 
 	@Override
-	public int sum(int value1, int value2) {
+	public String sum(int value1, int value2) {
-		return 0;
+		return "sum is 0.";
 	}
 }

spring-cloud-tencent-examples/quickstart-example/quickstart-caller-service/src/main/java/com/tencent/cloud/quickstart/caller/QuickstartCallerController.java

@@ -62,7 +62,7 @@ public class QuickstartCallerController {
 	 * @return sum
 	 */
 	@GetMapping("/feign")
-	public int feign(@RequestParam int value1, @RequestParam int value2) {
+	public String feign(@RequestParam int value1, @RequestParam int value2) {
 		return quickstartCalleeService.sum(value1, value2);
 	}