Spring MVC的@ExceptionHandler处理异常

矫情吗；* 2021-07-24 19:34 394阅读 0赞

**一 视图**

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html;  charset=UTF-8">
    <title>异常处理示例</title>
    <script type="text/javascript"  src="js/jquery-1.11.0.min.js"></script>
    </head>
    <body>
    <a href="test">@ExceptionHandler处理异常</a>
    
    <hr>
    <a href="login">UserController：父级Controller异常处理</a>
    
    <a href="find">BookController：父级Controller异常处理</a>
    
    </body>
    </html>

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"  "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html;  charset=UTF-8">
    <title>测试@ExceptionHandler注解</title>
    </head>
    <body>
    <h3>异常处理页面</h3>
    抛出异常信息：${requestScope.ex.message}
    </body>
    </html>

**二 控制器**

1 TestController

package org.fkit.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.servlet.ModelAndView;
    
    @Controller
    public class TestController{
    
        @GetMapping("/test")
        public String test() throws Exception{
            // 模拟异常
            int i = 5/0;
            return "success";
        }
        
        /**
         * 在异常抛出的时候，Controller会使用@ExceptionHandler注解的方法去处理异常
         * */
        @ExceptionHandler(value = Exception.class)
        public ModelAndView testErrorHandler(Exception e)  {
            ModelAndView mav = new ModelAndView();
            mav.setViewName("error");
            mav.addObject("ex", e);
            return mav;
        }
        
    }

2 BaseController

package org.fkit.controller;
    
    
    import org.springframework.web.bind.annotation.ExceptionHandler;
    import org.springframework.web.servlet.ModelAndView;
    
    public class BaseController {
    
        @ExceptionHandler(value = Exception.class)
        public ModelAndView defaultErrorHandler(Exception e) throws Exception {
            ModelAndView mav = new ModelAndView();
            mav.addObject("ex", e);
            mav.setViewName("error");
            return mav;
        }
    }

3 UserController

package org.fkit.controller;
    
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    
    @Controller
    public class UserController extends BaseController{
        
        @GetMapping("/login")
        public String login(String username) throws Exception{
            if(username == null ){
                throw new NullPointerException("用户名不存在!");
            }
            return "success";
        }
    }

4 BookController

package org.fkit.controller;
    
    
    import java.sql.SQLException;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    
    @Controller
    public class BookController extends BaseController{
        
        @GetMapping("/find")
        public String find() throws Exception{
            try {
                int i = 5/0;
                return "success";
            } catch (Exception e) {
                throw new SQLException("查找图书信息失败!");
            }
        }
    }

**三 配置文件**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
         xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans
             http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc.xsd     
            http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd">
            
        
        <context:component-scan base-package="org.fkit.controller"/>
        
        <mvc:annotation-driven/>
         
        <mvc:default-servlet-handler/>
        
        
         <bean id="viewResolver"
               class="org.springframework.web.servlet.view.InternalResourceViewResolver"
              p:prefix="/WEB-INF/content/" p:suffix=".jsp"/>
        
    </beans>

**四 测试**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/46fbb9706173452d8fef934a85264667.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3]: /images/20210724/da607c84ca8c49bb9704118fe0ee8e00.png