該程序通過提交數據給服務器，服務器通過servlet驗證后，返回信息給客戶端。

先上效果圖吧：此登錄的客戶端Demo是通過下載的源碼，服務器端我自己寫的。

登錄成功后效果：

1、Android客戶端的代碼為：

[java]?view plaincopy

package?com.loulijun.logindemo;??

??

import?java.security.MessageDigest;??

import?java.util.ArrayList;??

import?java.util.List;??

??

import?org.apache.http.HttpResponse;??

import?org.apache.http.NameValuePair;??

import?org.apache.http.client.HttpClient;??

import?org.apache.http.client.entity.UrlEncodedFormEntity;??

import?org.apache.http.client.methods.HttpPost;??

import?org.apache.http.impl.client.DefaultHttpClient;??

import?org.apache.http.message.BasicNameValuePair;??

import?org.apache.http.params.BasicHttpParams;??

import?org.apache.http.params.HttpConnectionParams;??

import?org.apache.http.protocol.HTTP;??

import?org.apache.http.util.EntityUtils;??

??

import?android.app.Activity;??

import?android.app.AlertDialog;??

import?android.app.ProgressDialog;??

import?android.content.Context;??

import?android.content.DialogInterface;??

import?android.content.Intent;??

import?android.content.SharedPreferences;??

import?android.content.SharedPreferences.Editor;??

import?android.net.ConnectivityManager;??

import?android.net.NetworkInfo.State;??

import?android.os.Bundle;??

import?android.os.Handler;??

import?android.os.Message;??

import?android.provider.Settings;??

import?android.view.View;??

import?android.widget.Button;??

import?android.widget.CheckBox;??

import?android.widget.CompoundButton;??

import?android.widget.EditText;??

import?android.widget.Toast;??

??

public?class?LoginDemoActivity?extends?Activity?{??

????/**?Called?when?the?activity?is?first?created.?*/??

????private?Button?loginBtn;??

????private?Button?registerBtn;??

????private?EditText?inputUsername;??

????private?EditText?inputPassword;??

????private?ProgressDialog?mDialog;??

????private?String?responseMsg?=?"";??

????private?static?final?int?REQUEST_TIMEOUT?=?5*1000;//設置請求超時10秒鐘????

????private?static?final?int?SO_TIMEOUT?=?10*1000;??//設置等待數據超時時間10秒鐘????

????private?static?final?int?LOGIN_OK?=?1;??

??????

??

????@Override??

????public?void?onCreate(Bundle?savedInstanceState)?{??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.login);??

????????loginBtn?=?(Button)findViewById(R.id.login_btn_login);??

????????registerBtn?=?(Button)findViewById(R.id.login_btn_zhuce);??

????????inputUsername?=?(EditText)findViewById(R.id.login_edit_account);??

????????inputPassword?=?(EditText)findViewById(R.id.login_edit_pwd);??

??????????????????

????????//登錄??

????????loginBtn.setOnClickListener(new?Button.OnClickListener()??

????????{??

??

????????????@Override??

????????????public?void?onClick(View?arg0)?{??

????????????????mDialog?=?new?ProgressDialog(LoginDemoActivity.this);??

????????????????mDialog.setTitle("登陸");??

????????????????mDialog.setMessage("正在登陸服務器，請稍后...");??

????????????????mDialog.show();??

????????????????Thread?loginThread?=?new?Thread(new?LoginThread());??

??????????????????

????????????????loginThread.start();??

??

????????????}??

??????????????

????????});??

??????????

????????registerBtn.setOnClickListener(new?Button.OnClickListener()??

????????{??

??

????????????@Override??

????????????public?void?onClick(View?arg0)?{??

????????????????Intent?intent?=?new?Intent();??

????????????????intent.setClass(LoginDemoActivity.this,?RegisterActivity.class);??

????????????????startActivity(intent);??

????????????}??

??????????????

????????});??

????}??

??????

??????

????private?boolean?loginServer(String?username,?String?password)??

????{??

????????boolean?loginValidate?=?false;??

????????//使用apache?HTTP客戶端實現??

????????String?urlStr?=?"http://10.0.2.2:8080/Login/Login";??

????????HttpPost?request?=?new?HttpPost(urlStr);??

????????//如果傳遞參數多的話，可以對傳遞的參數進行封裝??

????????List<NameValuePair>?params?=?new?ArrayList<NameValuePair>();??

????????//添加用戶名和密碼??

????????params.add(new?BasicNameValuePair("username",username));??

????????params.add(new?BasicNameValuePair("password",password));??

????????try??

????????{??

????????????//設置請求參數項??

????????????request.setEntity(new?UrlEncodedFormEntity(params,?HTTP.UTF_8));??

????????????HttpClient?client?=?getHttpClient();??

????????????//執行請求返回相應??

????????????HttpResponse?response?=?client.execute(request);??

??????????????

????????????//判斷是否請求成功??

????????????if(response.getStatusLine().getStatusCode()==200)??

????????????{??

????????????????loginValidate?=?true;??

????????????????//獲得響應信息??

????????????????responseMsg?=?EntityUtils.toString(response.getEntity());??

????????????}??

????????}catch(Exception?e)??

????????{??

????????????e.printStackTrace();??

????????}??

????????return?loginValidate;??

????}??

??????

?????

??????

????//初始化HttpClient，并設置超時??

????public?HttpClient?getHttpClient()??

????{??

????????BasicHttpParams?httpParams?=?new?BasicHttpParams();??

????????HttpConnectionParams.setConnectionTimeout(httpParams,?REQUEST_TIMEOUT);??

????????HttpConnectionParams.setSoTimeout(httpParams,?SO_TIMEOUT);??

????????HttpClient?client?=?new?DefaultHttpClient(httpParams);??

????????return?client;??

????}??

??

????//Handler??

????Handler?handler?=?new?Handler()??

????{??

????????public?void?handleMessage(Message?msg)??

????????{??

????????????switch(msg.what)??

????????????{??

????????????case?0:??

????????????????mDialog.cancel();??

??

????????????????Toast.makeText(getApplicationContext(),?"登錄成功！",?Toast.LENGTH_SHORT).show();??

????????????????Intent?intent?=?new?Intent();??

????????????????intent.setClass(LoginDemoActivity.this,?MainActivity.class);??

????????????????startActivity(intent);??

????????????????finish();??

????????????????break;??

????????????case?1:??

????????????????mDialog.cancel();??

????????????????Toast.makeText(getApplicationContext(),?"密碼錯誤",?Toast.LENGTH_SHORT).show();??

????????????????break;??

????????????case?2:??

????????????????mDialog.cancel();??

????????????????Toast.makeText(getApplicationContext(),?"URL驗證失敗",?Toast.LENGTH_SHORT).show();??

????????????????break;??

??????????????

????????????}??

??????????????

????????}??

????};??

??????

????//LoginThread線程類??

????class?LoginThread?implements?Runnable??

????{??

??

????????@Override??

????????public?void?run()?{??

????????????String?username?=?inputUsername.getText().toString();??

????????????String?password?=?inputPassword.getText().toString();?????

????????????System.out.println("username="+username+":password="+password);??

??????????????????

????????????//URL合法，但是這一步并不驗證密碼是否正確??

????????????boolean?loginValidate?=?loginServer(username,?password);??

????????????System.out.println("----------------------------bool?is?:"+loginValidate+"----------response:"+responseMsg);??

????????????Message?msg?=?handler.obtainMessage();??

????????????if(loginValidate)??

????????????{??

????????????????if(responseMsg.equals("success"))??

????????????????{??

????????????????????msg.what?=?0;??

????????????????????handler.sendMessage(msg);??

????????????????}else??

????????????????{??

????????????????????msg.what?=?1;??

????????????????????handler.sendMessage(msg);??

????????????????}??

??????????????????

????????????}else??

????????????{??

????????????????msg.what?=?2;??

????????????????handler.sendMessage(msg);??

????????????}??

????????}??

??????????

????}??

?????

??????

}??

2、服務器端的主要代碼為：

由于只是一個測試Demo，所以該測試并沒有通過數據庫的查詢，而是直接在程序中寫上固定的用戶名和密碼進行匹配。

[java]?view plaincopy

public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)??

????????????throws?ServletException,?IOException??

????{??

????????//response.setContentType("text/html");??

????????PrintWriter?out?=?response.getWriter();??

????????request.setCharacterEncoding("utf-8");??

??????????

????????String?name?=?request.getParameter("username");??

????????//out.print(name);??

????????String?pass?=?request.getParameter("password");??

????????//out.print(pass);??

????????if(("zlf").equals(name)&&"123456".equals(pass))??

????????{??

????????????out.print("success");??

????????}??

????????else???

????????{??

????????????out.print("failed");??

????????}??

????}??

??

????/**?

?????*?The?doPost?method?of?the?servlet.?<br>?

?????*?

?????*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?post.?

?????*??

?????*?@param?request?the?request?send?by?the?client?to?the?server?

?????*?@param?response?the?response?send?by?the?server?to?the?client?

?????*?@throws?ServletException?if?an?error?occurred?

?????*?@throws?IOException?if?an?error?occurred?

?????*/??

????public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)??

????????????throws?ServletException,?IOException??

????{??

????????doGet(request,?response);??

????}??

如有需要，下載源碼為：

改源碼有下載的別人的源碼，然后我自己沒進行數據庫連接，因此我改寫了一下。在源碼中，有一個android客戶端文件夾，一個Login文件夾，一個LoginServlet文件夾。Login文件夾是我自己改寫的servlet，測試可以正常運行

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