httpsample.java

http连接的客户端程序

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

import java.io.*;

public class HttpSample extends MIDlet implements CommandListener{
	private static String defaultURL = "http://localhost:8080/MobileServlet/httpsample";
	private Display myDisplay = null;
	private Form mainScreen ;
	private TextField requestField ;

	private Form resultScreen;
	private StringItem resultField;

	Command sendCommand = new Command("SEND",Command.OK,1);
	Command backCommand = new Command("BACK",Command.OK,1);

	public HttpSample(){
		myDisplay = Display.getDisplay(this);
		mainScreen = new Form("Type in a String :");
		requestField = new TextField("null","Hello Word !",100,TextField.ANY);
		mainScreen.append(requestField);
		mainScreen.addCommand(sendCommand);
		mainScreen.setCommandListener(this);
		
	}
	public void startApp(){
		myDisplay.setCurrent(mainScreen);
	}

	public void pauseApp(){
	
	}
	public void destroyApp(boolean b){
	
	}

	public void commandAction(Command c,Displayable s){
	
	if(c == sendCommand){
		System.out.println("Hello Word !");
		String requeststring = requestField.getString();
		
		String resultString = sendPostRequest(requeststring);
		resultScreen = new Form("Result String:");
		resultField = new StringItem(null,resultString);
		resultScreen.append(resultField);
		resultScreen.addCommand(backCommand);
		resultScreen.setCommandListener(this);
		myDisplay.setCurrent(resultScreen);

	}else if(c == backCommand ){
		requestField.setString("SOMETHING GOOD !");
		myDisplay.setCurrent(mainScreen);
	}
	
}

public String sendPostRequest(String requeststring){
	
	HttpConnection hc = null;
	DataInputStream dis = null;
	DataOutputStream dos = null;
	StringBuffer messagebuffer = new StringBuffer();
	try{
		hc = (HttpConnection)Connector.open(defaultURL,Connector.READ_WRITE);
		System.out.println("hello word !");
		hc.setRequestMethod(HttpConnection.POST);
		dos = hc.openDataOutputStream();
		byte[] request_body = requeststring.getBytes();
		for(int i = 0;i<request_body.length;i++){
			dos.writeByte(request_body[i]);
		}
		dos.flush();
		dos.close();

		dis = new DataInputStream(hc.openInputStream());
		int ch;

		long len = hc.getLength();
		if(len != -1){
			for (int i = 0 ;i<len;i++)
			
				if((ch=dis.read())!=-1)
					messagebuffer.append((char)ch);
		}else{
			while((ch=dis.read())!=-1){
			messagebuffer.append((char)ch);
			}
		}
		dis.close();
			
		}catch(IOException ioe){
			messagebuffer = new StringBuffer("ERROR!");

		}finally{
			try{
				System.out.println("hello word !");
				if (hc != null) hc.close();
				
			}catch(IOException ignored){}
			//try{
				if(dis != null) dis = null;
			//}//catch(IOException ignored){}
			//try{
				if (dos != null){
					dos = null;}
			//	}catch(IOException ignored){}
			
			}
			return messagebuffer.toString();
	
}

}