SpringMVC的异常处理

最新推荐文章于 2024-06-20 01:17:21 发布

原创最新推荐文章于 2024-06-20 01:17:21 发布 · 195 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#springmvc #异常 #异常处理 #自定义异常 #异常处理器

JAVA菜鸟文档专栏收录该内容

21 篇文章

订阅专栏

本文介绍如何在SpringMVC中实现自定义异常处理器，通过创建MyExceptionHandler类处理NullPointerException等异常，配置springmvc.xml启用异常处理器，并在error.jsp显示异常信息。

springmvc在处理请求过程中出现异常信息交由异常处理器进行处理，自定义异常处理器可以实现一个系统的异常处理。

1 MyExceptionHandler代码如下:

package com.sea.ssm.exceptions;

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

import org.apache.log4j.Logger;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

public class MyExceptionHandler implements HandlerExceptionResolver {
	Logger logger = Logger.getLogger(MyExceptionHandler.class);

	@Override
	public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
			Exception ex) {
		if (ex instanceof NullPointerException) {
			logger.error("空指针异常");
			logger.error(ex.getMessage());
		} else if (ex instanceof ClassCastException) {
			logger.error("类型转换异常");
			logger.error(ex.getMessage());
		} else if (ex instanceof NumberFormatException) {
			logger.error("数字格式转换异常");
			logger.error(ex.getMessage());
		}
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.setViewName("error");
		modelAndView.addObject("msg", "系统异常" + ex.getMessage());

		return modelAndView;
	}

}

2 springmvc.xml配置异常处理器:

<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

	<!-- 配置controller扫描包 -->
	<context:component-scan base-package="com.sea.ssm.controller" />
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<!-- 配置逻辑视图的前缀 -->
		<property name="prefix" value="/WEB-INF/jsp/" />
		<!-- 配置逻辑视图的后缀 -->
		<property name="suffix" value=".jsp" />
	</bean>
	
	<mvc:annotation-driven conversion-service="conversionService" />
	<!-- 配置自定义日期类型转换器 -->
	<bean id="conversionService"
		class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
		<property name="converters">
			<set>
				<bean class="com.sea.ssm.controller.DateConverter"></bean>
			</set>
		</property>
	</bean>
	<!-- 配置异常处理器 -->
	<bean class="com.sea.ssm.exceptions.MyExceptionHandler"></bean>
</beans>

3 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>Insert title here</title>
</head>
<body>
<h1>系统发生异常了！</h1>
	<br />
	<h1>异常信息</h1>
	<br />
	<h2>${msg }</h2>

</body>
</html>

4 log4j.properties配置（将异常的log存入e盘）

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=e:/mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=info, stdout,file