系统出错时写的的拦截器非常经典

package cn.com.css.common.interceptor;

import java.io.ioexception;

import java.sql.sqlexception;

import org.apache.commons.logging.log;

import org.apache.commons.logging.logfactory;

import org.springframework.dao.dataaccessexception;

import cn.com.css.common.exception.msipsysexception;

import cn.com.css.util.sysconstants;

import com.opensymphony.xwork2.actioninvocation;

import com.opensymphony.xwork2.interceptor.abstractinterceptor;

/**

 * 此类是struts2的拦截器当发生错误时<br/>

 * 由此类进行拦截并调用系统的异常处理类<br/>

 * 生成页面错误信息和打印log日志<br/>

 *

 * @version 1.0

 */

@suppresswarnings("serial")

public class msipsysexceptioninterceptor extends abstractinterceptor {

 //log4j实例名

 private static final log errorlog = logfactory.getlog(sysconstants.log_error);

 //构造方法

 private msipsysexceptioninterceptor() {

 }

 //初始化realpath只在服务器启动时执行一次

 @override

 public void init() {

 //主拦截方法,拦截常用的错误异常,当有异常发生时进行捕捉并打印log日志和生成页面的错误提示信息

 public string intercept(actioninvocation invocation) throws exception {

  string method=invocation.getproxy().getmethod();

  string namespace = invocation.getproxy().getnamespace().substring(invocation.getproxy().getnamespace().lastindexof("/")+1);

  string result = "";

  string mes = ""

    + "<br><br>namespace:" + invocation.getproxy().getnamespace()

    + "<br>action:" + invocation.getproxy().getaction()

    + "<br>method:" + invocation.getproxy().getmethod()

    + "<br><br>" + "具体的错误信息为:";

  try {

   result = invocation.invoke();

  } catch (dataaccessexception ex) {

   this.logging(method, namespace, ex);

   invocation.getinvocationcontext().put("invocationerror","数据库操作失败！" );

   throw new msipsysexception(mes+ ex.getmessage());

  } catch (nullpointerexception ex) {

   invocation.getinvocationcontext().put("invocationerror","调用了未经初始化的对象或者是不存在的对象！" );

   throw new msipsysexception(mes + ex.getmessage());

  } catch (ioexception ex) {

   invocation.getinvocationcontext().put("invocationerror","io异常！" );

  } catch (classnotfoundexception ex) {

   invocation.getinvocationcontext().put("invocationerror", "指定的类不存在！" );

  } catch (arithmeticexception ex) {

   invocation.getinvocationcontext().put("invocationerror", "数学运算异常！");

  } catch (arrayindexoutofboundsexception ex) {

   invocation.getinvocationcontext().put("invocationerror", "数组下标越界!" );

  } catch (illegalargumentexception ex) {

   invocation.getinvocationcontext().put("invocationerror", "方法的参数错误！");

  } catch (classcastexception ex) {

   invocation.getinvocationcontext().put("invocationerror","类型强制转换错误！");

  } catch (securityexception ex) {

   invocation.getinvocationcontext().put("invocationerror","违背安全原则异常！");

  } catch (sqlexception ex) {

   invocation.getinvocationcontext().put("invocationerror","操作数据库异常！" );

  } catch (nosuchmethoderror ex) {

   invocation.getinvocationcontext().put("invocationerror","方法末找到异常！" );

  } catch (internalerror ex) {

   invocation.getinvocationcontext().put("invocationerror","java虚拟机发生了内部错误" );

  } catch (exception ex) {

   invocation.getinvocationcontext().put("invocationerror","程序内部错误，操作失败！" );

  }

  return result;

 //打印log日志

 private void logging(string method,string namespace,exception ex)

 {

   errorlog.debug("-------------------"+namespace+"提交的method="+method+"---------------\n");

   errorlog.fatal("错误提示:"+ex.getmessage(),ex);

  } catch (exception e) {

   errorlog.debug("-------------------loggingmeg.xml文件解析错误---------------\n");

 private void logging(string method,string namespace,nosuchmethoderror ex)

 private void logging(string method,string namespace,internalerror ex)

}