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SpringMVC自定义异常处理器

SpringMVC自定义异常

项目结构

在这里插入图片描述

配置文件

  1. pom.xml

    <?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.xiaoge</groupId>
  <artifactId>springmvc_exception</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>springmvc_exception Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.version>5.0.2.RELEASE</spring.version>
  </properties>

  <dependencies>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring.version}</version>
  </dependency>

  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>${spring.version}</version>
  </dependency>

  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>${spring.version}</version>
  </dependency>


  <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    <scope>provided</scope>
  </dependency>

  <dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.0</version>
    <scope>provided</scope>
  </dependency>
  </dependencies>

  <build>
    <finalName>springmvc_exception</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

  2. web.xml**(重点:中文乱码的配置)**

    <!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!-- 前端控制器 -->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring.xml</param-value>
    </init-param>

    <!-- 当启动服务器的时候创建servlet对象 -->
    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!-- 配置解决中文乱码的过滤器 -->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

  3. spring.xml**(重点:配置自定义异常解析器)**

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 开启扫描注解 -->
    <context:component-scan base-package="com.xiaoge"></context:component-scan>

    <!-- 视图解析器 -->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 前端控制器, 那些静态资源不拦截 -->
    <!-- css目录下的所有资源不拦截 -->
    <mvc:resources  location="/css/" mapping="/css/**" />
    <!-- images目录下的所有资源不拦截 -->
    <mvc:resources  location="/images/" mapping="/images/**" />
    <!-- js目录下的所有资源不拦截 -->
    <mvc:resources  location="/js/" mapping="/js/**" />

    <!-- 配置异常处理器 -->
    <bean id="sysExceptionResolver" class="com.xiaoge.exception.SysExceptionResolver" />

    <!-- 开启SpringMVC注解 -->
    <mvc:annotation-driven ></mvc:annotation-driven>
</beans>

控制器

  1. UserController

    package com.xiaoge.controller;

import com.xiaoge.exception.SysException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @Author: 潇哥
 * @DateTime: 2020/4/24 下午8:18
 * @Description: 控制器
 */

@Controller
@RequestMapping("/user")
public class UserController {

    @RequestMapping("testException")
    public String testException() throws SysException {
        System.out.println("testException执行了....");

        try {
            // 模拟异常
            int a = 10 / 0;
        } catch(Exception e) {
            // 打印异常信息
            e.printStackTrace();
            // 抛出自定义异常信息
            throw new SysException("查询所有用户出现错误了...");
        }


        return "success";
    }

}

异常处理器和异常类

  1. SysException(异常类)

    package com.xiaoge.exception;

/**
 * @Author: 潇哥
 * @DateTime: 2020/4/24 下午8:42
 * @Description: TODO
 */
public class SysException extends Exception {

    // 存储提示信息的
    private String message;


    public SysException(String message) {
        this.message = message;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }


}

  2. SysExceptionResolver(自定义-异常处理器)

    package com.xiaoge.exception;

import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Author: 潇哥
 * @DateTime: 2020/4/24 下午8:59
 * @Description: 异常处理器
 */
public class SysExceptionResolver implements HandlerExceptionResolver {

    /**
     * 处理异常业务逻辑
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o 当前处理器对象
     * @param e 异常抛出的那个对象, 在这里是SysException对象
     * @return
     */
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        // 获取到异常对象
        SysException ex = null;

        // 如果e是SysException类型
        if (e instanceof SysException) {
            ex = (SysException)e;
        } else {
            ex = new SysException("系统正在维护.....");
        }

        // 创建ModelAndView对象
        ModelAndView mv = new ModelAndView();
        // 把这个键值对存到request域中
        mv.addObject("errorMsg", ex.getMessage());
        // 设置跳转的页面
        mv.setViewName("error");

        return mv;
    }
}

前台页面

  1. index.jsp

    <%--
  Created by IntelliJ IDEA.
  User: xiaoge
  Date: 2020/4/24
  Time: 下午9:09
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>异常处理</title>
</head>
<body>
<a href="user/testException">异常处理</a>
</body>
</html>

  2. success.jsp

    <%--
  Created by IntelliJ IDEA.
  User: xiaoge
  Date: 2020/4/24
  Time: 下午8:17
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>success</title>
</head>
<body>

</body>
</html>

  3. error.jsp

    <%--
  Created by IntelliJ IDEA.
  User: xiaoge
  Date: 2020/4/24
  Time: 下午8:17
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>error</title>
</head>
<body>
    ${errorMsg}
</body>
</html>
posted on 2020-04-25 18:08  gmlgxx  阅读(41)  评论(0)    收藏  举报
 
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