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 params = new ArrayList();  
        //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);  
            }  
        }  
          
    }  
     
      
}