安卓应用服务器端开发基础示例----基于severlet的登陆验证

安卓应用服务器端开发。如果没有服务端，那么安卓应用就少了一条腿。

最近在做一个自动化办公的app,因此需要将手机端的数据存储到服务器端。所以在此详细记录下学习过程，供大家参考。

因为安卓的开发者大部分熟悉JAVA语言，我也不例外。所以我选择了TOMCAT+Severlet来搭建我的服务端。

在myeclipse 新建一个severlet ,并发布到tomcat服务器。安卓应用端通过http协议进行数据交互。

下面是实现登陆验证的详细过程。

服务器端：

package mySeverlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Severlet1 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//response.setContentType("text/html;charset=UTF-8");          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(name.equals("luozhanwei")&&pass.equals("123456"))          {              out.print("success");                      }          else           {              out.println("failed");                       }  }public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//通常将dopost和doget合二为一doGet(request, response);}}

安卓端：

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;//设置请求超时10秒钟        private static final int SO_TIMEOUT = 10*1000;  //设置等待数据超时时间10秒钟        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);                            //登录          loginBtn.setOnClickListener(new Button.OnClickListener()          {                @Override              public void onClick(View arg0) {                  mDialog = new ProgressDialog(LoginDemoActivity.this);                  mDialog.setTitle("登陆");                  mDialog.setMessage("正在登陆服务器，请稍后...");                  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客户端实现          String urlStr = "http://10.0.2.2:8080/Login/Login";          HttpPost request = new HttpPost(urlStr);          //如果传递参数多的话，可以对传递的参数进行封装          List<NameValuePair> params = new ArrayList<NameValuePair>();          //添加用户名和密码          params.add(new BasicNameValuePair("username",username));          params.add(new BasicNameValuePair("password",password));          try          {              //设置请求参数项              request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));              HttpClient client = getHttpClient();              //执行请求返回相应              HttpResponse response = client.execute(request);                            //判断是否请求成功              if(response.getStatusLine().getStatusCode()==200)              {                  loginValidate = true;                  //获得响应信息                  responseMsg = EntityUtils.toString(response.getEntity());              }          }catch(Exception e)          {              e.printStackTrace();          }          return loginValidate;      }                       //初始化HttpClient，并设置超时      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(), "登录成功！", 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(), "密码错误", Toast.LENGTH_SHORT).show();                  break;              case 2:                  mDialog.cancel();                  Toast.makeText(getApplicationContext(), "URL验证失败", Toast.LENGTH_SHORT).show();                  break;                            }                        }      };            //LoginThread线程类      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，但是这一步并不验证密码是否正确              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);              }          }                }             }