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转载/Struts2拦截器实现异常处理机制

2016-04-21 07:55 501 查看

创建ErrorInterceptor.java

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;

import org.apache.struts2.StrutsStatics;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

public class ErrorInterceptor implements Interceptor {
private static final long serialVersionUID = 1L;
public void init() {

}

public String intercept(ActionInvocation actioninvocation){

// Action的返回值

String result = null;

try {

// 运行被拦截的Action,期间如果发生异常会被catch住

result = actioninvocation.invoke();

return result;

} catch (Exception e) {

//处理异常

String errorMsg = "出现错误信息，请查看日志！";

//通过instanceof判断到底是什么异常类型

if (e instanceof RuntimeException) {

//未知的运行时异常

RuntimeException runtimeException = (RuntimeException) e;

errorMsg = runtimeException.getMessage().trim();

}

//把自定义错误信息

HttpServletRequest request = (HttpServletRequest) actioninvocation.getInvocationContext().get(StrutsStatics.HTTP_REQUEST);



//发送错误消息到页面

request.setAttribute("errorMsg", errorMsg);

//log4j记录日志

Logger logger = Logger.getLogger(actioninvocation.getAction().getClass());

logger.error(errorMsg, e);

return "errorMsg";

}

}

public void destroy() {

}

}
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导入jstl-1.0.jar和standard-1.0.jar包

创建errorMsg.jsp文件，并添加JSTL标签，JSTL异常参考http://blog.csdn.net/isiah_zhou/article/details/51205363。

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt"%>

<!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>Error Message</title>

</head>
<body>
<c:if test="${requestScope.errorMsg == null}">
<p>对不起，系统发生了未知的错误，请查看日志</p>
</c:if>
<c:if test="${requestScope.errorMsg ne null}">
<p>${requestScope.errorMsg}</p>
</c:if>
</body>

</html>

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配置web.xml

<interceptors>



<interceptor name="errorInterceptor" class="com.shenzhen.management.util.exception.ErrorInterceptor" />



<interceptor-stack name="myErrorInterceptor">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="errorInterceptor" />

</interceptor-stack>
</interceptors>

<default-interceptor-ref name="myErrorInterceptor"/>

<global-results>

  <result name="errorMsg">/WEB-INF/page/errorMsg.jsp</result>

</global-results>

<global-exception-mappings>

<exception-mapping result="errorMsg" exception="java.lang.Exception"></exception-mapping>

</global-exception-mappings>

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原文链接：http://bbs.itcast.cn/thread-10364-1-1.html

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标签： 异常处理

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