騎豬闖天下

[J2ME] J2ME客戶端用戶登錄驗證

J2ME用戶登錄驗證


[說明]
        J2ME用戶登錄驗證，一直沒有搞定怎么回事，網(wǎng)上搜到 [J2ME/J2EE實現(xiàn)用戶登錄交互] ,還是不能運(yùn)行，問題主要出在Servlet上，沒有看過，不會配置，很是郁悶，前天在同學(xué)SpringChen的指點(diǎn)下，學(xué)會了配置，今天終于搞懂了J2ME用戶登錄驗證機(jī)制，非常高興，隨把調(diào)試的程序貼出來，以備以后查閱。
        代碼中，修改了原程序不合理及條例不清楚的部分，故升級為2.0版本，特此聲明。


[代碼部分]
實現(xiàn)功能:
用手機(jī)客戶端進(jìn)行登錄服務(wù)器，然后服務(wù)器返回消息進(jìn)行交互。


服務(wù)器代碼：
需要配置Servlet，首先熟悉Servlet相關(guān)知識。
LoginServlet：

package packageOne;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/** *//**
 * 服務(wù)器端代碼, 需配置Servlet.
 * Time: 2008 09 03 .
 */
public class LoginServlet extends HttpServlet 
{
    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        this.doPost(request, response);
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        // 得到客戶端傳入的數(shù)據(jù)(用戶名和密碼)
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        
        // 構(gòu)建輸出流
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        
        // 邏輯操作(這里寫你的邏輯判斷)
        if (username.equals("dcf") && password.equals("admin"))
        {
            // 響應(yīng)數(shù)據(jù)
            dos.writeUTF("true");
        } else
        {
            // 響應(yīng)數(shù)據(jù)
            dos.writeUTF("false");
        }
        
        //獲得寫入的字節(jié)數(shù)組流
        byte[] data = baos.toByteArray();
        
        // 設(shè)置服務(wù)器響應(yīng)參數(shù)
        response.setStatus(HttpServletResponse.SC_OK);
        response.setContentLength(data.length);
        response.setContentType("application/octet-stream");
        
        // 構(gòu)建輸出流, 寫入要返回給客戶端的數(shù)據(jù)
        OutputStream os = response.getOutputStream();        
        os.write(data);
        
        os.close();
    }

}

package com;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

/** *//**
 * 用Http  Post方式與服務(wù)器交互
 * 修改了轉(zhuǎn)貼源代碼中不合理的部分
 * @author Du Changfeng 2008 09 03
 * @version 2.0 
 */
public class LoginForm extends MIDlet implements CommandListener
{
    private Form form = null;
    private Display display = Display.getDisplay(this);;
    private Command login = null;
    private Command exit = null;
    private TextField username = null;
    private TextField password = null;
    private Alert alert = null;
    private Alert error = null;

    public LoginForm()
    {
        form = new Form("用戶登錄");
        display.setCurrent(form);
        login = new Command("登錄", Command.SCREEN, 1);
        exit = new Command("退出", Command.EXIT, 1);
        form.addCommand(login);
        form.addCommand(exit);

        username = new TextField("用戶名", "", 20, TextField.ANY);
        password = new TextField("密  碼", "", 20, TextField.PASSWORD);

        form.append(username);
        form.append(password);
        form.setCommandListener(this);
    }

    public void initAlertOK()
    {
        alert = new Alert("提示", "登錄成功 !\r\n您的用戶名為:" + username.getString()
                + "\r\n密碼為:" + password.getString(), null, AlertType.INFO);
        alert.setTimeout(Alert.FOREVER);
        display.setCurrent(alert);
    }

    public void initAlertError()
    {
        error = new Alert("提示", "登錄失敗,用戶名或密碼錯誤", null, AlertType.ERROR);
        display.setCurrent(error);
    }

    protected void startApp() throws MIDletStateChangeException
    {

    }

    /** *//** 
     * 事件處理
     */
    public void commandAction(Command cmd, Displayable dis)
    {
        // 點(diǎn)擊退出按鈕事件
        if (cmd.getCommandType() == Command.EXIT)
        {
            System.out.println("exit");
            this.notifyDestroyed();
        }
        if (cmd == login)
        {
            // 必須開啟獨(dú)立線程來處理Http請求,否則會造成死鎖
            new Thread(new Runnable()
            {
                public void run()
                {
                    try
                    {
                        inTurnServer();
                    } catch (Exception e)
                    {
                        e.printStackTrace();
                    }
                }
            }).start();

        }
    }

    /** *//***********************************************
     * 用Post與服務(wù)器交互相關(guān)代碼
     */
    public void inTurnServer()
    {
        // 服務(wù)器請求地址
        String url = "http://localhost:80/testLogin/login";
        // 用戶輸入的用戶名
        String username = this.username.getString();
        // 用戶輸入的密碼
        String password = this.password.getString();
        // 要發(fā)送的數(shù)據(jù)
        String formData = "username=" + username + "&password=" + password;
        // 轉(zhuǎn)換顯字節(jié)流
        byte[] data = formData.getBytes();
        
        try {            
            // 用url建立一個Http連接(安全的)
            HttpConnection conn = (HttpConnection) Connector.open(url);
            
            /** *//****以下為 設(shè)置連接屬性****/
            // 設(shè)置請求類型為POST
            conn.setRequestMethod(HttpConnection.POST);            
            // 設(shè)置一般的請求屬性
            conn.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");
            conn.setRequestProperty("User-Agent",
                    "Profile/MIDP-1.0 Configuration/CLDC-1.0");
            conn.setRequestProperty("Content-Language", "en-US");
            conn.setRequestProperty("Accept", "application/octet-stream");
            conn.setRequestProperty("Connection", "close");
            // 設(shè)置寫入流的長度
            conn.setRequestProperty("Content-Length", Integer
                    .toString(data.length));

            // 新建輸出流，對數(shù)據(jù)流進(jìn)行操作
            OutputStream os = conn.openOutputStream();
            // 寫入要Post的數(shù)據(jù)
            os.write(data);
            os.close();
            
            // 得到Http響應(yīng)代碼
            int rc = conn.getResponseCode();
            if (rc == HttpConnection.HTTP_OK)
            {
                // 構(gòu)建輸入流
                DataInputStream dism = new DataInputStream(conn
                        .openInputStream());
                
                // 讀取服務(wù)器返回的字節(jié)流
                String result = dism.readUTF();
                dism.close();
                
                // 判斷
                if (result.equals("true"))
                {
                    // 顯示登錄成功
                    this.initAlertOK();
                }
                if (result.equals("false"))
                {
                    // 顯示登錄失敗
                    this.initAlertError();
                    // 將輸入框置空
                    this.username.delete(0, this.username.getString().length());
                    this.password.delete(0, this.password.getString().length());
                }
            }
        } catch (IOException e)
        {
            e.printStackTrace();
            System.out.println("聯(lián)網(wǎng)出錯。");
            //如果請求路徑不正確，或?qū)傩栽O(shè)置錯誤，或服務(wù)器端的問題導(dǎo)致無法正確聯(lián)網(wǎng)
            error = new Alert("提示", "聯(lián)網(wǎng)出錯", null, AlertType.ERROR);
            display.setCurrent(error);
        }
    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException
    {

    }

    protected void pauseApp()
    {

    }

}

附一：服務(wù)器端Web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
    xmlns="http://java.sun.com/xml/ns/j2ee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    
  <servlet>     
  <servlet-name>LoginServlet</servlet-name>
  <servlet-class>packageOne.LoginServlet</servlet-class>
  </servlet>  
  
  <servlet-mapping>   
  <servlet-name>LoginServlet</servlet-name>   
  <url-pattern>/login</url-pattern>   
  </servlet-mapping>      
    
</web-app>

附二：服務(wù)器端index.jsp配置(可選內(nèi)容)

    <FORM  action="<%=request.getContextPath()%>/login" method="post" name="99">
    <input type="text" name="username" />
    <input type="text" name="password" />
    <INPUT type="submit" name="toLogin" value="登錄">
      </FORM>

<End>

posted on 2008-09-03 17:37 騎豬闖天下 閱讀(987) 評論(1)  編輯  收藏