ajax 的一个很简单问题

好像不是我说的那样
我现在这个项目也用AJAX，也在学习
楼主看看下面的帖子也许有帮助
http://blog.csdn.net/voff12/archive/2007/06/03/1636344.aspx
好像是数据量过大的原因。

DAO.javapackage com.zcq.dao;import javax.transaction.Transaction;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;import sun.print.resources.serviceui;
public class Dao {
  public Session session=null;
public Dao()
{
Configuration config=new Configuration().configure();
SessionFactory factory=config.buildSessionFactory();
session=factory.openSession();

}
public  void  closeSession()
{
    try {
if(session!=null)
{
session.close();
session=null;
}
} catch (Exception e) {
e.printStackTrace();
}
}
}Test.javapackage com.zcq.Servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.hibernate.Query;
import org.hibernate.Session;import com.zcq.dao.Asdas;
import com.zcq.dao.Dao;public class Test extends HttpServlet { /**
* Constructor of the object.
*/
public Test() {
super();
} /**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
} /**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
response.setContentType("text/xml;charset=gbk");

Dao dao=new Dao();
Session session=dao.session;
Query q=session.createQuery("from Asdas ");
List list=q.list();

StringBuffer buff=new StringBuffer("<b>");

for (Iterator iterator = list.iterator(); iterator.hasNext();) {
Asdas a= (Asdas) iterator.next();
buff.append("<zcqzcq>");
buff.append("<zcq>");
buff.append(a.getZcq());
buff.append("</zcq>");
buff.append("<bb>");
buff.append(a.getUnitno());
buff.append("</bb>");
buff.append("</zcqzcq>");

}

buff.append("</b>");
dao.closeSession();

        out.println(buff.toString());

        System.out.println(buff.toString());
out.flush();
out.close();
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doGet(request, response);
} /**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}}
index.jsp<%@ page   language="java" import="java.util.*" pageEncoding="gbk" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>


    <title>My JSP 'index.jsp' starting page</title>
<script type="text/javascript">
  var xmlhttp;

function createHttpRequest()
{

   if(window.ActiveXObject)
   {
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
   else if(window.XMLHttpRequest)
   {
     xmlhttp=new XMLHttpRequest();
   }
}
function asd()
{

createHttpRequest();
xmlhttp.onreadystatechange=handechange;

xmlhttp.open("post","Test");
xmlhttp.send("action=a");
}
function handechange()
{
    if(xmlhttp.readyState==4)
    {
       if(xmlhttp.status==200)
       {
           clarChilad();
          var property=null;
          var result=xmlhttp.responseXML;
       var zcqs= result.getElementsByTagName("zcqzcq");



          for(var i=0;i<zcqs.length;i++)
          {
           property=zcqs[i];
           var zcq1=property.getElementsByTagName('zcq')[0].firstChild.nodeValue;
           var bb=property.getElementsByTagName('bb')[0].firstChild.nodeValue;

            table(zcq1,bb);

           document.getElementById('sp').innerHTML=" <font color='#00FF66'>加载成功</font> "
          }

       }
    }
    else
    {
      document.getElementById('sp').innerHTML="<font color='red'>加载中..</font> "
    }


}
function clarChilad()
{

while(tb.childNodes.length>0)
{
     tb.removeChild(tb.childNodes[0]);
}
}function table(txt,txt2)
{

  var tb=document.getElementById('tb');

var tr=document.createElement('tr');

  var td=document.createElement('td');
  var tn=document.createTextNode(txt);

   var td2=document.createElement('td');
  var tn2=document.createTextNode(txt2);

  td.appendChild(tn);
  td2.appendChild(tn2);
  tr.appendChild(td);
tr.appendChild(td2);
  tb.appendChild(tr);
}

</script>
  </head>

  <body>
   <input type="text"  id="zcq" name="name" />

   <input type="button" value="dianji" onclick="asd()"  />
   <span id="sp"></span>


     <span id="aaa"></span>


   <table    border="1" >
     <tbody id="tb"></tbody>

   </table>
  </body>
</html>

对你的DAO 做了一下修改，试下看。public class Dao {
  static SessionFactory factory=null;
  private Session session=null;    static{
       Configuration config=new Configuration().configure();
       factory=config.buildSessionFactory();    }    public Dao()
    {

         session=factory.openSession();

    }
    public Session getSession()
    {
       return session;
    }
    public  void  closeSession()
    {
        try {
            if(session!=null)
            {
                session.close();
                session=null;
            }
        } catch (Exception e) {
             e.printStackTrace();
        }
    }
}Test中
Dao dao=new Dao();
        Session session=dao.getSession();

<property name="hibernate.c3p0.max_size">20</property>
这不是AJAX的问题，而是你的c3p0配置有问题
只配置了一个最大连接数
但没有配置自动关闭连接

问题解决了 10楼说的很对.. 不过少了一点就是在关闭连接的时候刷新下session 速度就很快了

调试易

ajax 的一个很简单问题

解决方案 »