关于J2ME与Servlet通信中的一些有关问题，在线跪求答案

关于J2ME与Servlet通信中的一些问题，在线跪求答案
现在正在做J2ME与Servlet之间通信的程序，但是在发送的时候总是有异常。下面是我的代码，希望各位高手指导指导。
public   class   httpGet   extends   MIDlet   implements   CommandListener   {
public   void   commandAction(Command   cmd,   Displayable   dis)   {

if(cmd   ==   downloadCommand)   {
http.setName(nameF.getString());
http.setPass(passF.getString());
synchronized(this){
notify();
}
}
}

package   src;

import   java.io.*;
import   javax.microedition.io.*;

public     class   HttpThread   implements   Runnable{
//private   String   url   =   "   ";
private   httpGet   midlet   =   null;
private   boolean   done   =   false;
public   static   final   String   HOST   =   "http://192.168.44.88:8080/do/servlet/Select? ";
public   static   final   String   HOST1   =   "http://localhost:8080/server/servlet/server ";
public   static   final   String   HOST3   =   "http://192.168.44.88:8080 ";
public   String   name   =   null;
        public   String   PassWrod   =   null;
public   HttpThread(httpGet   midlet)   {
this.midlet   =   midlet;
}

//public   void   setURL   (String   url)   {
//this.url   =   url;
//}

public   HttpConnection   openConnection()   throws   IOException   {
HttpConnection   conn   =   (HttpConnection)Connector.open(HOST1,Connector.READ_WRITE);      
return   conn;
}

public   void   setName(String   name){
this.name   =   name;
}

public   void   setPass(String   pass){
this.PassWrod   =   pass;
}

public   void   run()   {
while(!done)   {
synchronized   (midlet)   {
try{
try   {
midlet.wait();
}   catch   (InterruptedException   e)   {
//   TODO   Auto-generated   catch   block
e.printStackTrace();
}
if(!done)   {
HttpConnection   conn   =   openConnection();
conn.setRequestMethod(HttpConnection.POST);      
                                       
                                        conn.setRequestProperty( "IF-Modified-Since ", "15       Oct       2003       08:47:14       GMT ");      
                                        conn.setRequestProperty( "User-Agent ", "Profile/MIDP-2.0       Configuration/CLDC-1.1 ");      
                                        conn.setRequestProperty( "Content-Language ", "en-CA ");      
                                        conn.setRequestProperty( "Content-Type ", "application/x-www-form-urlencoded ");      

                                        conn.setRequestProperty( "Connection ", "Keep-Alive ");  

                                        int   responseCode   =   conn.getResponseCode();
if(responseCode   !=   HttpConnection.HTTP_OK){
midlet.error();
}

DataOutputStream   dos   =   conn.openDataOutputStream();
dos.writeUTF(name);
                                        dos.writeUTF(PassWrod);      
                                        dos.flush();
                                        System.out.println( "send   massage   is: "   +   name);      
                                       
DataInputStream   dis   =   conn.openDataInputStream();
        int   result   =   dis.readInt();
        System.out.println( "resave   massage   is: "   +   result);
midlet.displayResult(result);
                                     
dis.close();
dos.close();
conn.close();

}
}
catch(Exception   e){
e.printStackTrace();
}

    }
  }
      }
}

运行的时候提示
java.lang.IllegalStateException:   Write   attempted   after   request   finished


[解决办法]
java.lang.IllegalStateException: Write attempted after request finished
对于http连接，仅能进行一次读写，并且要先写入完毕才能打开输入流进行读操作
[解决办法]
还有,在客户端POST的时候设置一下Content-Length:
conn.setRequestProperty( "Content-Length ", "数据长度 ");