httpget.java

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package com.j2medev.ch6.get;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class HttpGET extends MIDlet implements CommandListener{
    
    private Display display = null;
    private Form mainForm = null;
    private HttpThread http = null;
    private TextField user = new TextField("用户名：", "", 20, TextField.ANY);
    private TextField password = new TextField("密 码：", "",20, TextField.PASSWORD);
    private Command loginCommand = new Command("登录",Command.OK, 1);
    private Command exitCommand = new Command("退出",Command.EXIT,2);
    
    public void startApp() {
        if(display == null){
            display = Display.getDisplay(this);
            mainForm = new Form("登录界面");
            mainForm.append(user);
            mainForm.append(password);
            mainForm.addCommand(loginCommand);
            mainForm.addCommand(exitCommand);
            mainForm.setCommandListener(this);
            http = new HttpThread(this);
            new Thread(http).start();
            display.setCurrent(mainForm);
        }else{
            display.setCurrent(mainForm);
        }
    }
    //根据服务器端返回的int类型数据判断是否登录成功
    public void displayResult(int result){
        if(result == 100){
            Form success = new Form("登录成功");
            success.append("恭喜您，成功登录了服务器！");
            display.setCurrent(success);
        }else{
            Alert alert = new Alert("错误");
            alert.setString("用户密码错误！");
            alert.setType(AlertType.ERROR);
            alert.setTimeout(2000);
            display.setCurrent(alert, mainForm);
        }
    }
    
    public void pauseApp() {
    }
    
    public void destroyApp(boolean unconditional) {
    }
    
    public void exit(){
        destroyApp(false);
        notifyDestroyed();
    }
    
    public void commandAction(Command cmd,Displayable displayable){
        if(cmd == loginCommand){
            String userName = user.getString();
            String pass = password.getString();
            String urlData = "username="+userName+"&password="+pass;
            System.out.println(urlData);
            http.setURLData(urlData);
            synchronized(this){
                notify();
            }
        }else if(cmd == exitCommand){
            exit();
        }
    }
}