org.hibernate.LazyInitializationException: could not initialize proxy - no Session

最新推荐文章于 2025-02-13 09:38:46 发布

原创最新推荐文章于 2025-02-13 09:38:46 发布 · 386 阅读

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本文介绍如何在Web应用中配置自定义的OpenSessionInViewFilter，以实现通过过滤器管理Hibernate会话生命周期的方法。该过滤器能确保在每个请求开始时开启一个Hibernate会话，并在请求结束时关闭。

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先在WEB.XML里面配置

        <filter-name>openSessionInView</filter-name>
        <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
          <filter-name>openSessionInView</filter-name>
          <url-pattern>/*</url-pattern>

</filter-mapping>

具体的类

package com.sxt.ktbank.filter;

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 org.hibernate.SessionFactory;
import org.springframework.context.ApplicationContext;

public class MyOpenSessionInViewFilter implements Filter {
     private ApplicationContext context=null;

   @Override
   public void destroy() {
       // TODO Auto-generated method stub

   }

   @Override
   public void doFilter(ServletRequest req, ServletResponse resp,
           FilterChain chain) throws IOException, ServletException {
       SessionFactory factory=(SessionFactory) context.getBean("SessionFactory");
       factory.getCurrentSession().beginTransaction();
       try{
       chain.doFilter(req, resp);
       factory.getCurrentSession().beginTransaction().commit();
       }catch(Exception e){
           factory.getCurrentSession().beginTransaction().rollback();
       }
       factory.getCurrentSession().close();
   }

   @Override
   public void init(FilterConfig config) throws ServletException {
       Object o=config.getServletContext().getAttribute("org.springframework.web.context.WebApplicationContext.ROOT");
       System.out.println(o.getClass().getName());
       this.context=(ApplicationContext) o;
   }


}

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