在struts2中提供了一些常用的拦截器，其中就包括对异常处理的拦截器，我们直接声明使用即可，下面来看个例子。
struts.xml
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!-- 对默认拦截器的引入 -->
<include file="struts-default.xml" />
<package name="eticket" extends="struts-default">
<!-- 全局异常映射 -->
<global-exception-mappings>
<exception-mapping result="error" exception="java.lang.Exception">
</exception-mapping>
</global-exception-mappings>
<action name="airTicketAction" class="AirTicketAction">
<result>airticket/airticket.jsp</result>
<result name="detail">airticket/airticketdetail.jsp</result>
<result name="order">airticket/airticketorder.jsp</result>
<result name="error">error.jsp</result>
<!-- 局部异常映射 -->
<exception-mapping result="nullPoint" exception="java.lang.NullPointerException"></exception-mapping>
<result name="nullPoint">error.jsp</result>
</action>
</package>
</struts>
下面是一个action，产生一个异常，用于测试
AirTicketAction.java
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class AirTicketAction extends ActionSupport {
@Override
public String execute() throws Exception {
// TODO 自动生成方法存根
//产生一个除数为0的异常
int i = 1/0;
return SUCCESS;
}
}
用于显示的jsp页面
error.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title><s:text name="login.title"></s:text></title>
</head>
<body>
<h1>出错了！</h1>
<s:property value="exception.message" />
<s:property value="exceptionStack" />
</body>
</html>
很简单，配置完成可以使用了。
文章出处：http://www.diybl.com/course/3_program/java/javajs/2008827/137748_2.html