checkpopmail.java

使用你的手机发送和接受邮件

/* *********************************************************
* Title:        J2ME POP3 Email Retreival	   	
* Version:      1.0    					   		
* Copyright:    Copyright (c) 1999 -2000  
* Author:       Sudhir					    
* Email:        [e-mail] 		   	
* URL :         http://www.nextel.com/		   	
*							   	
********************************************************** */


import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.io.*;
import java.io.InputStream;
import java.io.PrintStream;


public class CheckPopMail extends MIDlet implements CommandListener  {

  private String MAIL_SERVER_URL = "http://168.73.26.198:156/servlet/J2MePop3?";  
  private int MAX_LIST_SIZE = 10; //At any time max 10 messages will be shown 
    
  Display display = null;
  List menu = null; 
  List dmenu = null; 
  TextBox input = null;
  String[] msgs = new String[MAX_LIST_SIZE]; 
  String user = null;
  
  int status = 0; 
        // 0 : Very starting screen
        // 1 : Showing Email Subjects List
 
  
  static final Command backCommand = new Command("Back", Command.BACK, 0);
  static final Command submitCommand = new Command("Submit", Command.OK, 2);
  static final Command exitCommand = new Command("Exit", Command.STOP, 3);
  
  public CheckPopMail() { }

  public void startApp()  throws MIDletStateChangeException 
  {
    display = Display.getDisplay(this);
    defaultMenu();
  }

  public void pauseApp() { }

  public void destroyApp(boolean unconditional) {
    notifyDestroyed();
  }

  // handle events.
  public void commandAction(Command c,  Displayable d) {
    String label = c.getLabel();

    if(label.equals("Exit")) {
      destroyApp(true);
    } else if (label.equals("Back")) {
      handleBack();
    } else if (label.equals("Submit")) {
      user = input.getString();
      retreiveMail(0, null);
    } else if (d == dmenu) {
            handleDMenu(); // Handle Default Menu
    } else if (d == menu) {
            handleMMenu(); // Handle Main Menu which has list of Messages
    } else
      loginUsr();     
  }

  private void defaultMenu() {    
    dmenu = new List("POP3 Email", Choice.IMPLICIT); //2, Change Order    
    dmenu.append("Check Email", null); //2, Change Order
    
    if (user == null) 
        dmenu.append("Login", null); //1 
    else     
        dmenu.append("Logout", null); //1 // If user already logged in, show Logout
        
    dmenu.append("Send Mail", null); //3
    
    dmenu.addCommand(exitCommand);
    dmenu.setCommandListener(this);
    display.setCurrent(dmenu);
    status = 0;
  }

  //Prompt the user to input his/her name.
  private void loginUsr() {
    input = new TextBox("Enter Login Name/Password (Seperate by /) :", "test/test", 25, TextField.ANY);
    input.addCommand(submitCommand);
    input.addCommand(backCommand);
    input.setCommandListener(this);
    input.setString("");
    display.setCurrent(input);
  }  
  
  /*
    param s can have the following values,
    0 = User is trying to Login
    1 = Retreive Subject List
    2 = Retreive a particular message
  */
  
  private void retreiveMail(int s, String msgNum)
  {
	// This menu can be easily constructed. It's more costly to
	// keep it initialized
	// remove only after user log's in
	
	//dmenu = null; 
	
	String popURL = MAIL_SERVER_URL + "u=" + user;
	
	if (s == 1) 
	    popURL = popURL + "&s=" + msgNum + "&a=l"; // List messages starting from msgNum
	else if (s == 2) 
	    popURL = popURL + "&i=" + msgNum + "&a=r"; // retreive message with id = msgNum

    //System.out.println("Connecting to URL " + popURL);

	StreamConnection c = null;
	InputStream is=null;
	StringBuffer sb = null;	
	String err = null;
	
	try {	    
	    c = (StreamConnection)Connector.open(popURL, Connector.READ_WRITE);
        is = c.openInputStream();
        int ch;
        sb = new StringBuffer();
        while ((ch = is.read()) != -1) {
            sb.append((char)ch);            
        }
    }
    catch(Exception ex){ err = ex.getMessage(); }
    finally {
      try {
        if(is!= null) {is.close(); }
        if(c != null) {c.close(); }
      }
      catch(Exception exp) { err = exp.getMessage(); }  
	}
	
	//System.out.print(sb.toString());
	
	if (err == null) 
	{        
        if (s == 0) {
            user = sb.toString();                                    
            
            if (user.indexOf("INVALIDUSR") >= 0) {
            //if ((user.length() >= 10) && (user.substring(0,10).equals("INVALIDUSR"))) {                
                //System.out.print("Matches with invalid user length");
                user = null;
                showAlert("Invalid User Name and Password");                                
            }            
            else {               
               // Until user log's out and tries to login again, 
               // this object can be removed
               input = null; 
               dmenu = null;
               defaultMenu(); 
            }
        }    
        
        else if (s == 1) // For retreiving the list    
            showMList(sb.toString());                        
        else // s ==2, show Message   
            showMsg(sb.toString()); // Keep message limited to first 2000 characters               
    }
    else     
       showAlert(err); // Need to Show Error Page
  }
  
  
  private void showMsg(String msg) {
    StringBuffer buffer = new StringBuffer(200);
        
    // Enable this part when the new line character works good.
    /*int delim = '