hibernatefilter.java

客户关系管理系统主要管理新老客户的一些信息并可以发现潜在客户

package com.qrsx.qrsxcrm.web;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.ObjectDeletedException;
import org.hibernate.exception.ConstraintViolationException;
import org.hibernate.exception.GenericJDBCException;

import com.qrsx.qrsxcrm.dao.HibernateUtil;



/**
 * 用于进行Hibernate事务处理的Servlet过滤器
 * 
 * @author galaxy
 */
@SuppressWarnings("serial")
public class HibernateFilter implements Filter  {

    private static Log log = LogFactory.getLog(HibernateFilter.class);

    /**
     * 过滤器的主要方法 用于实现Hibernate事务的开始和提交
     */
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        
        try {
            // 开始一个新的事务
            log.debug("Starting a database transaction");
            
            //HibernateUtil.getSession().beginTransaction();
            HibernateUtil.getSession().beginTransaction();
            	  chain.doFilter(request, response);
            

          

            // 提交事务
            HibernateUtil.getSession().getTransaction().commit();
            	  //tx.commit();

        }
        catch( ConstraintViolationException e )
        {
        	e.printStackTrace();
        	HttpSession session = ((HttpServletRequest) request).getSession();
        	session.setAttribute("wrong","错误信息");
        	
        	System.out.print(session.getAttribute("wrong"));
        	System.out.print("++++++++++++++++++++++");
//        	return;
        }
        catch(ObjectDeletedException e3)
        {
//        	HttpSession session = ((HttpServletRequest) request).getSession();
//        	session.setAttribute("wrong","错误信息");
//        	
//        	System.out.print(session.getAttribute("wrong"));
//        	System.out.print("++++++++++++++++++++++");
        	e3.printStackTrace();
        	System.out.print("HibernateFilter 发生异常现象！");
        	HttpSession session = ((HttpServletRequest) request).getSession();
        	session.invalidate();
        	String js = "<Script>alert('对不起，操作有误，请重新启动服务器！');location.href='/qrsxcrm/logon.jsp';</Script>";
			response.getWriter().print(js);
        }
//        
//        catch(GenericJDBCException e )
//        {
//        	System.out.print("HibernateFilter 发生异常现象！");
//        	HttpSession session = ((HttpServletRequest) request).getSession();
//        	session.invalidate();
//        	String js = "<Script>alert('对不起，操作有误，请重新登录！');location.href='/qrsxcrm/logon.jsp';</Script>";
//			response.getWriter().print(js);
//        }
        catch (Throwable ex) {
            ex.printStackTrace();
            try {
                HibernateUtil.getSession().getTransaction().rollback();
            	//tx.rollback();
            } catch (Throwable rbEx) {
                log.error("Could not rollback transaction after exception!",
                        rbEx);
            }

            // 抛出异常
            throw new ServletException(ex);
        }
    }

    /**
     * Servlet过滤器的初始化方法 可以读取配置文件中设置的配置参数
     */
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    /**
     * Servlet的销毁方法 用于释放过滤器所申请的资源
     */
    public void destroy() {
    }

}