midlet.java

我做的毕业设计

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

public class Midlet extends MIDlet implements CommandListener ,Runnable{
    Display display; 
    String tf1Str,tf2Str;
    TextField tf1,tf2;
    Form scen,inputForm,returnForm;
    Command cmdSend,cmdBack,cmdExit,con;
    String defaultURL;
    String query=null;
  public Midlet(){

       tf1=new TextField("   学号", "", 10, TextField.NUMERIC); 
       tf2=new TextField("   密码", "", 10, TextField.PASSWORD);
       con=new Command("进入",Command.SCREEN, 1);
       cmdExit=new Command("退出", Command.EXIT, 0);
       cmdSend=new Command("确认", Command.SCREEN, 1);
       cmdBack=new Command("返回", Command.SCREEN, 1);
       Ticker tk=new Ticker("欢迎使用学生成绩查询系统");
       scen=new Form("           众志成城   战胜灾难");
       inputForm=new Form("                     用户登陆"); 

       try{ Image img=Image.createImage("/1.png");
               Image img2=Image.createImage("/3.jpg");
               inputForm.append(img); 
               scen.append(img2);
            }catch(IOException e){ System.out.println("图象加载出错 : "+e.getMessage());}

        inputForm.append("                   "); 
        inputForm.append(tf1); 
        inputForm.append(tf2); 
       inputForm.setTicker(tk);
       scen.addCommand(cmdExit);
       scen.addCommand(con);
       inputForm.addCommand(cmdExit);
       inputForm.addCommand(cmdSend);
       inputForm.setCommandListener(this);
       scen.setCommandListener(this);

  }
  
  public void startApp() throws MIDletStateChangeException {
      display=Display.getDisplay(this);
      display.setCurrent(scen);      
  }
    public void pauseApp(){}
    public void destroyApp(boolean unconditional){
    notifyDestroyed();
    }
   
    public void commandAction(Command c,Displayable d){
     if(c==cmdExit){destroyApp(true);}
     if(c==con){display.setCurrent(inputForm);}
     if(c==cmdBack){display.setCurrent(inputForm);}
     if(c==cmdSend){
                               query="";
                               defaultURL="http://localhost:8080/ServletApp";
                               tf1Str=tf1.getString();
                               tf2Str=tf2.getString();
                               query="num="+tf1Str+"&"+"code="+tf2Str;
                               defaultURL+="?"+query;
        try{
            Thread t=new Thread(this);
            t.start();
           System.out.println("线程运行正常吗 ： " +t.isAlive());
           System.out.println("手机传递给SERVLET的查询参数为："+tf1Str+"\n"); 
        } catch(Exception e) {System.out.println(e.getMessage());}
     }
    }      
 public void run(){
       try{ invokeServlet(defaultURL);
          }catch(Exception ee){ ee.printStackTrace();}
            }
    
      public void invokeServlet(String url) throws IOException{
      HttpConnection hc=null;
      DataInputStream dis=null;
      StringBuffer sb=null;
      try{
          hc=(HttpConnection) Connector.open(url,Connector.READ_WRITE);
          hc.setRequestMethod(HttpConnection.GET);
          hc.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0");
          hc.setRequestProperty("Content-Language", "en-CA");
          hc.setRequestProperty("Content-Type", "application/GBK");
         dis= (DataInputStream) hc.openDataInputStream();       
try
   {
 	    int ch;
  	    sb=new StringBuffer();
                      while((ch=dis.read())!=-1)   {
	         sb.append((char)ch);
	    }              
   }
   catch(EOFException e)
   {//如果此输入流在读取所有字节之前到达末尾
    System.out.println("str is null,exit!---" +e.getMessage());
    }
  
         System.out.println("手机接收到SERVLET传来的查询结果为："+sb.toString()+"\n");
         String str=new String(sb.toString().getBytes("ISO8859_1"),"gb2312");
         System.out.println("转换后的查询结果为 ："+str);
         returnForm=new Form("以下是您查询的结果");
         Ticker tik=new Ticker("书山有路勤为径");
         returnForm.setTicker(tik);
        if(str.equals("false")){
             str="\n"+"            对不起，您输入的密码或用户名有误"+"          "+"请核对后重新输入";
        }
         returnForm.append(str);
         returnForm.addCommand(cmdBack);
         returnForm.setCommandListener(this);     
      }
      finally{
          if (dis!=null){dis.close();
      }
          if(hc!=null){hc.close();
          }
          display.setCurrent(returnForm);
      }
  }
}