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转载/Struts2拦截器实现异常处理机制

2016-04-22 14:56 489 查看

创建ErrorInterceptor.javaimport 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() {

}
}
-----------------------------------------------------------默默无闻的分割线-----------------------------------------------------------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>
-----------------------------------------------------------默默无闻的分割线-----------------------------------------------------------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> -----------------------------------------------------------默默无闻的分割线-----------------------------------------------------------原文链接：http://bbs.itcast.cn/thread-10364-1-1.html

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