android 之手机客户端登陆

今天要学的例子是通过android 手机客户端登陆到服务器。验证是否登陆成功。

首先：我们在myEclipse 中新建一个web项目提供手机客户端的登陆请求，并做出响应，我们使用struts2.1.8。做一个简单的示例。

这个web服务可以接收post |get 的请求。代码如下：

package com.hkrt.action;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.Action;public class LoginCheckAction implements Action{            private String userName;      private String password;            public String execute() throws Exception {                    HttpServletRequest request = ServletActionContext.getRequest();          InputStream is = request.getInputStream();        byte [] result = readIS(is);        if(result.length>0){         Map<String,String> resuestMap = getRequestParams(new String(result));             if(!resuestMap.isEmpty()){              userName = resuestMap.get("userName");              password = resuestMap.get("password");             }        }else{          userName = request.getParameter("userName");                password = request.getParameter("password");          }        System.out.println("userName:"+userName+"\tpassword:"+password);        HttpServletResponse response = ServletActionContext.getResponse();          OutputStream os = response.getOutputStream();            if(!"zs".equals(userName) || !"123".equals(password)){              os.write(new String("-1").getBytes());          } else {              os.write(new String("1").getBytes());          }                    response.setStatus(HttpServletResponse.SC_OK);          System.out.println("数据访问");                      return null;        }      public static byte[] readIS(InputStream is) throws IOException {ByteArrayOutputStream bos = new ByteArrayOutputStream();byte[] buff = new byte[1024];int length = 0;while ((length = is.read(buff)) != -1) {bos.write(buff, 0, length);}return bos.toByteArray();}    // 以Post 请求时，返回请求一个map的请求参数    private Map<String,String> getRequestParams(String requestStr){    Map<String,String> maps = new HashMap<String, String>();String [] strs = requestStr.split("&");List<String> list = new ArrayList<String>();for(String st:strs){list.add(st);}for(String lis:list){maps.put(lis.split("=")[0],lis.split("=")[1]);}return maps;    }    public String getUserName() {          return userName;      }        public void setUserName(String userName) {          this.userName = userName;      }        public String getPassword() {          return password;      }        public void setPassword(String password) {          this.password = password;      } }

配置strus.xml 文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <package name="default" namespace="/actions" extends="struts-default">        <!-- 登陆 action -->    <action name="LoginCheckAction" class="com.hkrt.action.LoginCheckAction"/>    </package></struts>

现在服务器代码就写完了，没有与数据库进行交互。

以下。我们实现android 客户端登陆的代码：

页面如下：很难看...

android 之手机客户端登陆_第1张图片

代码实现的功能：记录用户名和密码，以get或post 方式请求服务。线程之间的数据交互，对UI进行绘制。

package com.hkrt.activity;import java.io.BufferedInputStream;import java.io.ByteArrayOutputStream;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.ProtocolException;import java.net.URL;import java.net.URLEncoder;import android.app.Activity;import android.app.ProgressDialog;import android.content.Context;import android.content.Intent;import android.content.SharedPreferences;import android.content.SharedPreferences.Editor;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.CheckBox;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;import com.hkrt.R;public class LoginUserActivity extends Activity {   private static final String TAG_POST = "post 请求";   private EditText userNameEdit,passwordEdit;   private CheckBox checkPwd;//记录密码   private ImageButton login;//登陆按钮   private   SharedPreferences sharedPreferences ;//保存用户名和密码的文件   private Editor editor;//编辑   private ProgressDialog proDialog;  //进度条   private Handler loginHandler;//信息处理机   private String userName;   private String password;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.login_user_activity);initView();remberMe();login.setOnClickListener(submitListener);loginHandler = new Handler(){@Overridepublic void handleMessage(Message msg) {Bundle bundle = msg.getData();boolean loginResult = (Boolean)bundle.get("isNetError");//只获取登陆失败 if(proDialog != null){                  proDialog.dismiss();              }    boolean isNet =  isNetWorkAvailable(LoginUserActivity.this);    if(!isNet){       Toast.makeText(LoginUserActivity.this, "当前网络不可用",  Toast.LENGTH_SHORT).show();     }            if(!loginResult) {               Toast.makeText(LoginUserActivity.this, "错误的用户名或密码",  Toast.LENGTH_SHORT).show();              }  super.handleMessage(msg);}};}//查测网络是否连接 需要添加连网权限 返回true 表示联网 返回false 表示没有联网 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />public static boolean isNetWorkAvailable(Context context) {           ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);           NetworkInfo info = cm.getActiveNetworkInfo();          return info != null && info.isConnected();             } //初始化UI组件private void initView(){userNameEdit = (EditText)this.findViewById(R.id.username_edit);passwordEdit = (EditText)this.findViewById(R.id.password_edit);checkPwd = (CheckBox)this.findViewById(R.id.checkPwd);login = (ImageButton)this.findViewById(R.id.login);}//记录密码private void remberMe(){sharedPreferences= getSharedPreferences("login",Context.MODE_PRIVATE);editor = sharedPreferences.edit();//获取编辑器  String userName = sharedPreferences.getString("name","");String pwd = sharedPreferences.getString("pwd","");userNameEdit.setText(userName);passwordEdit.setText(pwd);if(userName!=null && !userName.equals("")){checkPwd.setChecked(true);}} //登陆事件   private OnClickListener submitListener = new OnClickListener() {                public void onClick(View v) {          userName = userNameEdit.getText().toString();        password=passwordEdit.getText().toString();        if(checkPwd.isChecked()){// 编辑配置  editor.putString("name",userName);  editor.putString("pwd",password);  editor.commit();//提交修改  }else{editor.putString("name",null);  editor.putString("pwd", null);  editor.commit();//提交修改  }            proDialog = ProgressDialog.show(LoginUserActivity.this,"请稍候","正在登陆...", true, true);     Thread loginThread = new Thread(new LoginFailureHandler());              loginThread.start();          }      };     // 验证是否登陆成功private class LoginFailureHandler implements Runnable{@Overridepublic void run() { boolean loginState = loginActionMethodPost(userName,password); if(loginState){ Intent intent = new Intent(LoginUserActivity.this,LoginUserSuccessActivity.class); Bundle bun = new Bundle(); bun.putString("userName",userName); bun.putString("password",password); intent.putExtras(bun); startActivity(intent);    proDialog.dismiss();   }else{Message message = new Message();Bundle bundle = new Bundle();              bundle.putBoolean("isNetError",loginState);              message.setData(bundle);  loginHandler.sendMessage(message);    }}}//请求登陆 get 方式 private boolean loginActionMethodGet(String name,String pwd){BufferedInputStream bufIn  = null;boolean login =false;   String validateURL="http://10.0.2.2:8080/androidService/actions/LoginCheckAction?userName=" + name + "&password=" +pwd; try {URL url = new URL(validateURL);HttpURLConnection httpConn =  (HttpURLConnection)url.openConnection();httpConn.setConnectTimeout(5000);  httpConn.setRequestMethod("GET");     httpConn.connect();  bufIn = new BufferedInputStream(httpConn.getInputStream());if(httpConn.getResponseCode()==HttpURLConnection.HTTP_OK){byte [] body = new byte [1];bufIn.read(body);String loginState  = new String(body);if(loginState.equals("1")){ //返回1登陆成功 -1登陆失败login =true;}else{login =false;}}} catch (MalformedURLException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{if(bufIn!=null){try {bufIn.close();} catch (IOException e) {e.printStackTrace();}}}return login;}// 登陆的 post 方式private boolean loginActionMethodPost(String name, String pwd) {boolean login = false;// Post方式请求String validateURL = "http://10.0.2.2:8080/androidService/actions/LoginCheckAction";// 请求的参数转换为byte数组String params;try {params = "userName=" + URLEncoder.encode(name, "UTF-8") + "&password=" + URLEncoder.encode(pwd,"UTF-8");byte[] postData = params.getBytes();// 新建一个URL对象URL url = new URL(validateURL);// 打开一个HttpURLConnection连接HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();// 设置连接超时时间urlConn.setConnectTimeout(5 * 1000);// Post请求必须设置允许输出urlConn.setDoOutput(true);// Post请求不能使用缓存urlConn.setUseCaches(false);// 设置为Post请求urlConn.setRequestMethod("POST");urlConn.setInstanceFollowRedirects(true);// 配置请求Content-TypeurlConn.setRequestProperty("Content-Type","application/x-www-form-urlencode");// 开始连接urlConn.connect();// 发送请求参数DataOutputStream dos = new DataOutputStream(urlConn.getOutputStream());dos.write(postData);dos.flush();dos.close();// 判断请求是否成功if (urlConn.getResponseCode() == HttpURLConnection.HTTP_OK) {// 获取返回的数据byte[] data = readIS(urlConn.getInputStream());if(data.length>0){String loginState = new String(data);if (loginState.equals("1")) {login = true;}Log.i(TAG_POST, "Post请求方式成功，返回数据如下：");Log.i(TAG_POST, new String(data, "UTF-8"));}} else {Log.i(TAG_POST, "Post方式请求失败");}} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (MalformedURLException e) {e.printStackTrace();} catch (ProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally{}return login;}//读取服务器返回的记录  public static byte[] readIS(InputStream is) throws IOException {ByteArrayOutputStream bos = new ByteArrayOutputStream();byte[] buff = new byte[1024];int length = 0;while ((length = is.read(buff)) != -1) {bos.write(buff, 0, length);}bos.flush();bos.close();return bos.toByteArray();}}

注：服务器的请求路径，由127.0.01 改成10.0.2.2

android 之手机客户端登陆_第2张图片 android 之手机客户端登陆_第3张图片

以上android 客户端登陆代码可以使用apache 公司的HttpClient.代码格式如下：

// 使用Apache 提供的httpClient 发送get 请求private boolean loginActionMethodHttpGet(String name,String pwd){BufferedInputStream bufIn  = null;boolean login =false;String validateURL="http://10.0.2.2:8080/androidService/actions/LoginCheckAction?userName=" + name + "&password=" +pwd; HttpGet get = new HttpGet(validateURL);HttpClient httpClient = new DefaultHttpClient();try {HttpResponse httpResponse = httpClient.execute(get);HttpEntity entity = httpResponse.getEntity();if(entity!=null){bufIn = new BufferedInputStream(entity.getContent());byte [] body = new byte [1];bufIn.read(body);String loginState  = new String(body);if(loginState.equals("1")){ //返回1登陆成功 -1登陆失败login =true;}else{login =false;}}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return login;}// 使用Apache 提供的httpClient 发送 post 请求private boolean loginActionMethodHttpPost(String name,String pwd){boolean login =false;String validateURL = "http://10.0.2.2:8080/androidService/actions/LoginCheckAction";HttpPost httpPost = new HttpPost(validateURL);List<NameValuePair> params = new ArrayList<NameValuePair>();HttpClient httpClient = new DefaultHttpClient();try {params.add(new BasicNameValuePair("userName", name));params.add(new BasicNameValuePair("password", pwd));httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));HttpResponse httpResponse = httpClient.execute(httpPost);if(httpResponse.getStatusLine().getStatusCode()==200){String loginState = EntityUtils.toString(httpResponse.getEntity());System.out.println("apache post:"+loginState);if(loginState.equals("1")){ //返回1登陆成功 -1登陆失败login =true;}else{login =false;}}} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return login;}

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