springMVC 异常
0.依赖（不只是本次案例所需）
<?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.gxeom</groupId>
<artifactId>bookshop</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies><!--1.servlet-api jsp-api 2个jar包--><!--作用：
1. Springmvc 当中要用servlet对象 request session
2. Springmvc web.xml配置 dispatcherServlet 继承httpServlet
3.Springmvc 的注解 -->
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/jsp-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency><!--2.数据库 3个jar包 --> <!-- mysql的连接驱动 版本要和自己的数据库版本相匹配 -->
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<!-- 连接池的依赖-->
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency>
<!-- 我为了使用JdbcTemplate 所以我们要导入spring-jdbc-->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency> <!--3.spring核心 3个jar包（SpEL）不必须导入 --> <!-- spring 核心依赖 beans core context SpEL(不是必须导入)-->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.5.RELEASE</version>
</dependency> <!--4. Spring-web+ Spring-mvc+json 3个jar包--> <!-- 要和web相结合 spring-web-->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!-- Spring mvc -->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!-- springmvc配套的第三方json依赖-->
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency> <!--5.aop+aspectj 3个jar包--> <!-- AOP ASPECTJ-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<!--aop切点-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.6.11</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.6.11</version>
</dependency>
<!--动态代理-->
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib</artifactId>
<version>2.1</version>
</dependency> <!-- 6.jstl标签 2个jar包
作用： 页面上去掉 scriptlet(脚本) 页面上获值并输出--> <!--jstl+standard-->
<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/taglibs/standard -->
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency> <!--7.图片上传 2个jar包-->
<!--字节流+图片-->
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
</dependencies></project>
1.xml配置（WEB-INF下）
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0"> <!--转发控制器-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!-- 配置classpath contextConfigLocation
默认classpath WEB-INF-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:Spring-MVC.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- <error-page>-->
<!-- <error-code>404</error-code>-->
<!-- <location>/fristex.do</location>-->
<!-- </error-page>--> <servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping><!-- <servlet-mapping>-->
<!-- <servlet-name>default</servlet-name>-->
<!-- <url-pattern>*.js</url-pattern>-->
<!-- <url-pattern>*.css</url-pattern>-->
<!-- <url-pattern>*.map</url-pattern>-->
<!-- <url-pattern>*.jpg</url-pattern>-->
<!-- <url-pattern>*.png</url-pattern>-->
<!-- </servlet-mapping>--></web-app>
2.spring-mvc配置
<?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: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
">
<!-- <mvc:resources mapping="/js/**" location="js/"></mvc:resources>--><!-- mvc驱动-->
<mvc:annotation-driven></mvc:annotation-driven>
<context:component-scan base-package="com.tjetc.*"></context:component-scan>
<bean id="sysExceptionResolver" class="com.tjetc.exeception.SysExetionResolve"></bean>
3.SysExeption类
package com.tjetc.exeception;public class SysExeption extends Exception{ private String message; public SysExeption(String message) {
this.message = message;
} @Override
public String getMessage() {
return message;
} public void setMessage(String message) {
this.message = message;
}
}
4.SysExetionResolve
package com.tjetc.exeception;import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class SysExetionResolve implements HandlerExceptionResolver { @Override
public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception ex) {
SysExeption e = null;
if ( ex instanceof SysExeption){
e= (SysExeption)ex;
}else {
e=new SysExeption("系统正在维护。。");
}
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("errorMsg",e.getMessage());
modelAndView.setViewName("error.jsp");
return modelAndView;
}
}
5.FristController
package com.tjetc.controller;import com.tjetc.exeception.SysExeption;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;@Controller
public class FristController {
@RequestMapping("fristex.do")
public String fristEX() throws SysExeption {
try {
System.out.println(1/0);
}catch (Exception e){
e.printStackTrace();
throw new SysExeption("查询出错了。。。");
}
return "success.jsp";
}
}
6.error.jsp
<%--
Created by IntelliJ IDEA.
User: sun
Date: 2020/6/8
Time: 11:24
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>
${errorMsg}
</body>
</html>
