我用ThreadLocal管理session,出现中文问题? 奇怪!

我参照的ThreadLocal管理session的代码是如下网址:
http://www.mail-archive.com/hibernate-devel@lists.sourceforge.net/msg01715.html

我得实现方式是:Struts+DAO+hibernate.
另外,为了解决中文问题,实现了一个filter类,来设置request的encoding.
所有的Action都用filter过滤.

在没有用ThreadLocal管理之前,我是在DAO里,每个方法都开一个session,完了之后关闭,这样没有出现中文问题.

但是参照以上网址修改我得程序,主要是把我得SetCharacterEncodingFilter类修改成在filter里管理session.
我在jsp页面用
<%@ page contentType="text/html; charset=gb2312" %>
但是这样取出的中文都变成????.改为iso8859_1编码,输出正常.

不知上面是什末原因,请大家指教,先谢了!

在对程序逐层分析之后,问题范围也逐步缩小了:

我的运行环境为:win2000,resin2.1.6,mysql3.23.56,hibernate2.0.1

以下源码是我的程序,:

package com.dao.mysql;

// EXPLICIT IMPORTS
import com.dao.UserDAO;
import com.persistent.User;
import net.sf.hibernate.*;
import net.sf.hibernate.cfg.Configuration;

import java.util.Collection;
import java.util.List;
import java.util.ArrayList;


/**
 * UserDAOImpl.java Description:
 *
 * @see
 * @author   <a href="mailto:udbihcel@163.com">Steven Zheng</a>.
 * @version	1.0
 */
public class UserDAOImpl1 {
    // Constants-------------------------------

    // Attributes------------------------------
    private static SessionFactory sessionFactory;
    private static Configuration conf = null;
    // Static----------------------------------

    public UserDAOImpl1(); throws Exception{
         init();;
    }
    // Public Methods----------------------------------
    
    
    /**
     * 根据User的ID取出user对象
     * @param     user        操作员的持久类.
     * @return    User        如果成功,返回带有信息的user,
     *                        否则返回null。
     * @throws HibernateException
     */
    public User findByUserID(User user); throws HibernateException{
        try{
            session = sessionFactory.openSession();;
            user = (User);session.load(User.class,user.getUserId(); );;
            
            /******************************************
               System.err.println(user.getUserName(););;  //在此取出中文的userName
            /******************************************
            
            session.flush();;
        }catch(HibernateException he);{
            user = null;
            throw he;  //抛出异常
        }
        return user;
    }

    //Private-----------------------------------
    //初始化sessionFactory  
    private static synchronized void init(); throws Exception {
	if (sessionFactory != null); {   //如果已经初始化,返回.
		return;
	}
        try {
            /*************************************************
            //如果在次全部载入*.hbm.xml文件,classpath已经有hibernate.cfg.xml文件
            //会出现上面findByUserID(User user);取出的中文userName为????乱码.
            //数据库中为正常中文.
             conf = new  Configuration();.configure();;    
            /*************************************************
            
            /*************************************************
                //如果只是单独载入User,则取出的中文userName正常显示
                conf = new  Configuration();.addClass(User.class);;
            /*************************************************
            
            sessionFactory = conf.buildSessionFactory();;
        } catch (MappingException me); {
            throw me;
        } catch (HibernateException he); {
            throw he;
        }
}
   private Transaction tx = null;
   private Session session = null;
}

*******************************************************

以下贴出hibernate.cfg.xml文件内容:

<?xml version='1.0' encoding='utf-8'?> 
<!DOCTYPE hibernate-configuration PUBLIC 
        "-//Hibernate/Hibernate Configuration DTD 2.0//EN" 
 "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd"> 
<hibernate-configuration> 
    <!-- a SessionFactory instance listed as /jndi/name --> 
    <session-factory  name="hibernate/SessionFactory"> 
        <!-- properties --> 
        <property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property> 
        <property name="show_sql">true</property> 
        <property name="use_outer_join">false</property> 
         
        <!-- database properties --> 
        <property name="connection.datasource">java:comp/env/jdbc/mysql</property> 

        <!-- mapping files --> 
        <mapping resource="com/persistent/Boatbyday.hbm.xml" /> 
        <mapping resource="com/persistent/City.hbm.xml" /> 
        <mapping resource="com/persistent/Citysum.hbm.xml" /> 
        <mapping resource="com/persistent/Deceivesurvey.hbm.xml" /> 
        <mapping resource="com/persistent/Enter.hbm.xml" /> 
        <mapping resource="com/persistent/Enterprise.hbm.xml" /> 
        <mapping resource="com/persistent/Enterprisetype.hbm.xml" /> 
        <mapping resource="com/persistent/Putupbyday.hbm.xml" /> 
        <mapping resource="com/persistent/Sight.hbm.xml" /> 
        <mapping resource="com/persistent/Sightbyday.hbm.xml" /> 
        <mapping resource="com/persistent/Sightputday1.hbm.xml" /> 
        <mapping resource="com/persistent/Sightputday2.hbm.xml" /> 
        <mapping resource="com/persistent/Sightsum.hbm.xml" /> 
        <mapping resource="com/persistent/Trafficbyday.hbm.xml" /> 
        <mapping resource="com/persistent/Travelbyday.hbm.xml" /> 
        <mapping resource="com/persistent/User.hbm.xml" /> 
    </session-factory> 

</hibernate-configuration> 

************************************************************


另外,如果用ThreadLocal+filter来管理session,session是不是不用在每个DAO方法中关闭.
而是象http://www.mail-archive.com/hibernate-devel@lists.sourceforge.net/msg01715.html 中所介绍的,在filter中,在doFilter()方法之后来由ThreadLocal来管理关闭session.

在此先谢了!!!

这应该和如何用hibernate无关吧，只和你的database connection或datasource的encoding有关吧。

谢谢你的回复:)

请看我的web.xml文件:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">


<web-app>
    <filter>
        <filter-name>Set Character Encoding</filter-name>
        <filter-class>com.filters.SetCharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>GB2312</param-value>
        </init-param>
	<init-param>
            <param-name>ignore</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>Set Character Encoding</filter-name>
        <servlet-name>action</servlet-name>
    </filter-mapping>
    

 <resource-ref>
  <res-ref-name>jdbc/mysql</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <init-param driver-name="org.gjt.mm.mysql.Driver"/>
  <init-param url="jdbc:mysql://172.16.1.145/goldenweek?useUnicode=true;characterEncoding=GBK"/>
  <init-param user="root"/>
  <init-param password=""/>
  <init-param max-connections="20"/>
  <init-param max-idle-time="30"/>
</resource-ref>


 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
    <param-name>application</param-name>
    <param-value>ApplicationResources_zh</param-value>
  </init-param>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>validate</param-name>
      <param-value>true</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
</servlet>

  <!-- Standard Action Servlet Mapping -->
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
    <welcome-file-list>
      <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

</web-app>

因为所有的操作是先提交到Action中,中间用了filter,主要是设置request的encoding为gb2312.
连接数据库时,也指定了编码jdbc:mysql://172.16.1.145/goldenweek?useUnicode=true&characterEncoding=GBK
数据库中中文正常显示.

crazyren,你好,我一直这样用,没有问题,能把你的错误贴出来吗?

昨天,问题得到解决了,主要问题出在hibernate.cfg.xml文件中.
在我上面的帖子中,hibernate.cfg.xml内容有以下信息:

java:comp/env/jdbc/mysql数据源是在应用的web.xml文件中定义的.
<!-- database properties --> 
        <property name="connection.datasource">java:comp/env/jdbc/mysql</property> 
把此行信息删除,把web.xml中的数据源定义也删除掉.

重启resin服务,问题解决.
谢谢大家的解答.

两个地方的数据源定义都删除了，那你的数据源定义在哪里呢？