自定义struts异常处理
思路：
1. 针对特定http状态码，返回到指定错误提示页面，例如：403、404、500……
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2. 配置全局异常拦截器，针对捕获的异常进行分类，并增加用户简洁错误信息和开发、维护 详细错误信息，并写入日志，最后 跳转到错误页面
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3. 对于某些特定异常部分不需要跳转到错误页面的，则自行进行捕获，不往上层抛出即可
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web.xml
<!-- 出错页面定义 --><error-page><exception-type>java.lang.Throwable</exception-type><location>/html/error_page.html</location></error-page><error-page><error-code>500</error-code><location>/html/error_page_500.html</location></error-page><error-page><error-code>404</error-code><location>/html/error_page_404.html</location></error-page><error-page><error-code>403</error-code><location>/html/error_page_403.html</location></error-page>
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struts.xml
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<interceptors><!-- 全局异常拦截器 --> <interceptor name="exceptionInterceptor" /> <interceptor-stack name="bussdefault"><interceptor-ref name="defaultStack"/><interceptor-ref name="exceptionInterceptor" /></interceptor-stack></interceptors><global-results><result name="forward">${callbackurl}</result><result name="freemarker" type="freemarker">${callbackurl}</result><result name="success" type="json"></result> <result name="error" type="freemarker">/html/error_page.html</result></global-results> <!-- 未到找Action指向页面 --><default-action-ref name="errorPage" /><action name="errorPage"><result type="redirect">/html/error_page_404.html</result></action>???
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ExceptionInterceptor.java
package com.hzp.exception;import java.io.IOException;import java.sql.SQLException;import javax.servlet.http.HttpServletRequest;import org.apache.commons.lang.xwork.StringUtils;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.apache.struts2.ServletActionContext;import org.springframework.dao.DataAccessException;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.AbstractInterceptor;/** * 全局异常拦截器 * 对捕捉到的异常进行分类，保存错误提示信息，并跳转到错误页面 * @author hzp * */public class ExceptionInterceptor extends AbstractInterceptor {private static final String ERROR="error";//日志protected static Log logger = LogFactory.getLog(ExceptionInterceptor.class);@Overridepublic String intercept(ActionInvocation actionInvocation) {logger.debug("########### 全局异常拦截器start #########");String result = "";String errorMsg=""; //给用户查看的简洁错误信息StringBuffer errorMsgDetail=null; //给开发或维护人员查看的详细错误信息StackTraceElement[] ste=null;HttpServletRequest request=ServletActionContext.getRequest();try {result = actionInvocation.invoke();} catch (DataAccessException ex) {errorMsg="数据库操作失败!";ste=ex.getStackTrace();result=ERROR;} catch (NullPointerException ex) {errorMsg="空指针，调用了未经初始化或者是不存在的对象!";ste=ex.getStackTrace();result=ERROR;} catch (IOException ex) {errorMsg="IO读写异常!";ste=ex.getStackTrace();result=ERROR;} catch (ClassNotFoundException ex) {errorMsg="指定的类不存在!";ste=ex.getStackTrace();result=ERROR;} catch (ArithmeticException ex) {errorMsg="数学运算异常!";ste=ex.getStackTrace();result=ERROR;} catch (ArrayIndexOutOfBoundsException ex) {errorMsg="数组下标越界!";ste=ex.getStackTrace();result=ERROR;} catch (IllegalArgumentException ex) {errorMsg="调用方法的参数错误!";ste=ex.getStackTrace();result=ERROR;} catch (ClassCastException ex) {errorMsg="类型强制转换错误!";ste=ex.getStackTrace();result=ERROR;} catch (SecurityException ex) {errorMsg="违背安全原则异常!";ste=ex.getStackTrace();result=ERROR;} catch (SQLException ex) {errorMsg="操作数据库异常!";ste=ex.getStackTrace();result=ERROR;} catch (NoSuchMethodError ex) {errorMsg="调用了未定义的方法!";ste=ex.getStackTrace();result=ERROR;} catch (InternalError ex) {errorMsg="Java虚拟机发生了内部错误!";ste=ex.getStackTrace();result=ERROR;} catch (Exception ex) {errorMsg="程序内部错误，操作失败!";ste=ex.getStackTrace();result=ERROR;}//捕获到异常时，保存用户查看的简洁异常信息if(StringUtils.isNotEmpty(errorMsg)){logger.error(errorMsg);//输出错误信息到日志request.setAttribute("errorMsg",errorMsg);}//捕获到异常时，保存开发或维护人员查看的详细异常信息if(null!=ste && ste.length>0){errorMsgDetail=new StringBuffer();for(StackTraceElement s:ste){errorMsgDetail.append(s.toString()).append("<br/>");}logger.error(errorMsgDetail);//输出错误信息到日志request.setAttribute("errorMsgDetail",errorMsgDetail.toString());}logger.debug("########### 全局异常拦截器end #########");return result;}}??
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error_page.html
<!DOCTYPE HTML PUBLIC "-//IETF//DTD LEVEL1//EN"><html> <head> <title>错误页面</title> </head> <body> <font color="red"> 服务器遇到错误<hr><br/> 信息提示：<br/>${errorMsg!}<br/><br/> <a href="javascript:void()" onclick="document.getElementById('detail').style.display='block'; ">点击查看详细信息</a> <div id="detail" style="display:none"> <hr><br/> 详细信息：<br/>${errorMsgDetail!} </div> </font> </body></html>