自定义异常类
SysException.java
package com.zjw.exception;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
/**
* 自定义异常类
*/
@Getter
@Setter
@AllArgsConstructor
public class SysException extends Exception {
/**
* 存储提示信息
*/
private String message ;
}
异常处理器
实现
HandlerExceptionResolver接口。
SysExceptionResolver.java
package com.zjw.exception;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 异常处理器
*/
public class SysExceptionResolver implements HandlerExceptionResolver {
/**
* 处理异常业务逻辑
* @param request
* @param response
* @param handler
* @param ex
* @return
*/
@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
//获取到异常对象
SysException e = null;
if (ex instanceof SysException){
e = (SysException) ex;
}else {
e = new SysException("系统正在维护中");
}
ModelAndView mv = new ModelAndView();
mv.addObject("errorMsg",e.getMessage());
mv.setViewName("error");
return mv;
}
}
Controller
package com.zjw.controller;
import com.zjw.exception.SysException;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/user")
public class UserController {
@RequestMapping("/testException")
public String testException() throws SysException {
System.out.println("testException方法执行了。。。。");
try {
int a = 1/0 ;
} catch (Exception e) {
e.printStackTrace();
throw new SysException("查询所有用户出现错误了。。。");
}
return "success";
}
}
springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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">
<!--开启注解扫描-->
<context:component-scan base-package="com.zjw"/>
<!--配置视图解析器-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--前端控制器，哪些静态资源不拦截-->
<mvc:resources location="/css/" mapping="/css/**"/>
<mvc:resources location="/images/" mapping="/images/**"/>
<mvc:resources location="/js/" mapping="/js/**"/>
<!--配置异常处理器-->
<bean id="sysExceptionResolver" class="com.zjw.exception.SysExceptionResolver"/>
<!--开启SpringMVC框架注解的支持-->
<mvc:annotation-driven/>
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
version="5.0">
<display-name>Archetype Created Web Application</display-name>
<!--配置过滤器-->
<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>
<!--配置前端控制器-->
<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:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
error.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>error</title>
</head>
<body>
${errorMsg}
</body>
</html>