Spring中的异常处理机制

springMvc/src/main/java/com/controller/DataResponseController.java

@@ -1,5 +1,7 @@
 package com.controller;
 
+import com.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -15,6 +17,8 @@ import java.io.IOException;
 
 @Controller
 public class DataResponseController {
+    @Autowired
+    UserService userService;
     // 返回 modelAndView
     @RequestMapping("/modelView1")
     public ModelAndView modelView1() {
@@ -37,6 +41,7 @@ public class DataResponseController {
     // 可以单独设置 Model
     @RequestMapping("/modelView3")
     public String modelView3(Model model) {
+        userService.saveUser();
         model.addAttribute("name","modelName");
         return "template/index.jsp";
     }

springMvc/src/main/java/com/controller/ExceptionTestController.java

@@ -1,7 +1,21 @@
 package com.controller;
 
+import com.exception.MyException;
 import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.util.HashMap;
+import java.util.Map;
 
 @Controller
 public class ExceptionTestController {
+    @RequestMapping("/exception1")
+    @ResponseBody // 异常测试
+    public Map exception1() {
+        HashMap stringStringHashMap = new HashMap<String, String>();
+        stringStringHashMap.put("1","2");
+        throw new MyException();
+//        return stringStringHashMap;
+    }
 }

springMvc/src/main/java/com/controller/UserController.java

@@ -59,7 +59,7 @@ public class UserController {
     public Map save4() {
         HashMap<String, String> stringStringHashMap = new HashMap<String, String>();
         stringStringHashMap.put("1","2");
-
+        int  a = 1/0;
         return stringStringHashMap;
     }
 

springMvc/src/main/java/com/exception/MyException.java

@@ -0,0 +1,5 @@
+package com.exception;
+
+public class MyException extends RuntimeException{
+
+}

springMvc/src/main/java/com/exception_resolver/MyExceptionResolver.java

@@ -0,0 +1,20 @@
+package com.exception_resolver;
+
+import com.exception.MyException;
+import org.springframework.stereotype.Component;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+@Component
+public class MyExceptionResolver implements HandlerExceptionResolver {
+    @Override
+    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
+        ModelAndView modelAndView = new ModelAndView();
+        String message = e instanceof MyException ? "自定义异常":"非自定义的异常";
+        modelAndView.addObject("message",message);
+        modelAndView.setViewName("my_error");
+        return modelAndView;
+    }
+}

springMvc/src/main/resources/Spring-mvc.xml

@@ -53,14 +53,13 @@
             <property name="defaultEncoding" value="UTF-8"></property>
         </bean>
 <!--        配置简单映射异常处理器器-->
-        <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
-            <property name="defaultErrorView" value="error"></property>
-            <property name="exceptionMappings">
-                <map>
-<!--                    <entry key="">-->
-
-<!--                    </entry>-->
-                </map>
-            </property>
-        </bean>
+<!--        <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">-->
+<!--&lt;!&ndash;            <property name="defaultErrorView" value="error"></property>&ndash;&gt;-->
+<!--            <property name="exceptionMappings">-->
+<!--                <map>-->
+<!--                    <entry key="java.lang.RuntimeException" value="runtime_error"></entry>-->
+<!--                    <entry key="com.exception.MyException" value="my_error"></entry>-->
+<!--                </map>-->
+<!--            </property>-->
+<!--        </bean>-->
 </beans>

springMvc/src/main/webapp/template/my_error.jsp

@@ -0,0 +1,16 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: 77179
+  Date: 2022/5/25
+  Time: 20:31
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>Title</title>
+</head>
+<body>
+<h1>${message}</h1>
+</body>
+</html>

springMvc/src/main/webapp/template/runtime_error.jsp

@@ -0,0 +1,16 @@
+<%--
+  Created by IntelliJ IDEA.
+  User: 77179
+  Date: 2022/5/25
+  Time: 20:31
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>Title</title>
+</head>
+<body>
+<h1>runtime_error</h1>
+</body>
+</html>