mobileservlet.java

手机客户端和servlet的通讯

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
import java.io.DataInputStream;

public class MobileServlet extends MIDlet implements CommandListener 
{
Display display; 

TextField tf1,tf2;  
String tf1Str,tf2Str;
Form inputForm,returnForm;
Command cmdSend,cmdBack;
private static String defaultURL = "http://192.167.0.12:8080/MobileServlet/ms_servlet";
public MobileServlet()
{

display = Display.getDisplay(this);
tf1 = new TextField("input first param:","卢东方",20,TextField.ANY);
tf2 = new TextField("input second param:","王桃群",20,TextField.ANY);
cmdSend = new Command("Send",Command.SCREEN,1);
cmdBack = new Command("Back",Command.SCREEN,1);
inputForm = new Form("pls input the param:");
inputForm.append(tf1);
inputForm.append(tf2);
inputForm.addCommand(cmdSend);		
inputForm.setCommandListener(this);	
tf1Str = tf1.getString();
tf2Str = tf2.getString();
}

public void startApp() throws MIDletStateChangeException
{
//display.setCurrent(inputForm);	
try{ invokeServlet(defaultURL);
}catch(Exception e)
	{System.out.println(e.getMessage());}

}

public void invokeServlet(String url) throws IOException 
{

HttpConnection hc = null; 
DataOutputStream dos = null;
DataInputStream dis = null; 

try{
hc = (HttpConnection)Connector.open(url,Connector.READ_WRITE);


//设置请求属性
hc.setRequestMethod(HttpConnection.POST);
 //设置为POST请求方式,默认的请求方式是GET

hc.setRequestProperty("IF-Modified-Since","15 Oct 2003 08:47:14 GMT");
hc.setRequestProperty("User-Agent","Profile/MIDP-1.0 Configuration/CLDC-1.0");
hc.setRequestProperty("Content-Language","en-CA");
hc.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
hc.setRequestProperty("Connection","Keep-Alive");

//Connection头可以控制MIDlet和Web服务器之间保持"keep alive"特色。
//"keep alive"特色是指在MIDlet和Web服务器间始终使用同一个HTTP连接来多次传递数据
//（在通常情况下，HTTP是无连接的协议，每次数据传输完毕后都将断开连接，
//而下次传递数据之前将重新建立连接） 
//发送请求参数到servlet

dos = hc.openDataOutputStream();
hc.setRequestProperty("Content_Length",Integer.toString(tf1Str.length()));
dos.writeUTF(tf1Str); 
hc.setRequestProperty("Content_Length",Integer.toString(tf2Str.length()));
dos.writeUTF(tf2Str);

//用于发送请求参数给servlet
System.out.println("手机传递给servlet的第一个参数为:"+ tf1Str);

//主要起调试的作用，调试的结果将显示在WTK的控制台中
System.out.println("手机传递给servlet的第一个参数为:"+ tf2Str);	

dos.flush();
dos.close();

dis = new DataInputStream(hc.openInputStream());
System.out.println("测试成功测试成功!");
int rc = hc.getResponseCode();
if(rc == HttpConnection.HTTP_OK)
	{
//接收servlet响应数据


String return1Str = dis.readUTF(); 
String return2Str = dis.readUTF();
System.out.println("手机接收到servlet端传来的第一个参数为:" + return1Str);
//主要起调试的作用，调试的结果将显示在WTK的控制台中
System.out.println("手机接收到servlet端传来的第二个参数为:" + return2Str);

returnForm = new Form("返回的结果");
returnForm.append(return1Str);
returnForm.append("\n");
//将返回的结果append到resultForm中

returnForm.append(return2Str);
returnForm.addCommand(cmdBack);
returnForm.setCommandListener(this);	
}  else{System.out.println(rc);}	
}finally{
if (dis != null) 
	{dis.close();} 
if (dos != null) 
	{dos.close();}
if (hc != null) 
	{hc.close();}
}
display.setCurrent(returnForm);   
}

public void pauseApp(){}

public void destroyApp(boolean unconditional){}

public void commandAction(Command c,Displayable d){
if(c == cmdBack)
	{display.setCurrent(inputForm);}
if(c == cmdSend)
	{tf1Str = tf1.getString(); 
     tf2Str = tf2.getString();
//try{ invokeServlet(defaultURL);
//}catch(Exception e)
//	{System.out.println(e.getMessage());}
}

}
}