Android使用jsp+sevlet+mysql实现简单的前后台登录系统

转载请注明出处：http://blog.csdn.net/dennisxzr/article/details/23847073（来自Dennis锐少的csdn博客）

简单的使用jsp+sevlet+mysql来创建android的服务端

实现客户端与服务端的交互

可以在此基础上练习添加其他功能

客户端代码：

[java]view plain copy
package com.android.cn;  
  
  
import org.apache.http.client.methods.HttpPost;  
  
  
import android.app.Activity;  
import android.app.AlertDialog;  
import android.content.DialogInterface;  
import android.content.Intent;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.EditText;  
  
  
public class AndroidDemosActivity extends Activity {  
  
  
        private Button cancelBtn, loginBtn;  
        private EditText userEditText, pwdEditText;  
  
  
        @Override  
        public void onCreate(Bundle savedInstanceState) {  
                super.onCreate(savedInstanceState);  
                setContentView(R.layout.main);  
  
  
                cancelBtn = (Button) findViewById(R.id.Canclebtn);  
                loginBtn = (Button) findViewById(R.id.Loginbtn);  
  
  
                userEditText = (EditText) findViewById(R.id.etUserName);  
                pwdEditText = (EditText) findViewById(R.id.etPassword);  
  
  
                cancelBtn.setOnClickListener(new OnClickListener() {  
                        public void onClick(View v) {  
                                finish();  
                        }  
                });  
  
  
                loginBtn.setOnClickListener(new OnClickListener() {  
                        public void onClick(View v) {  
                                HttpPost request = new HttpPost("http://www.baidu.com");  
                                if (validate()) {  
                                        if (login()) {  
                                                Intent intent = new Intent(AndroidDemosActivity.this,  
                                                                MainActivity.class);  
                                                startActivity(intent);  
                                        } else {  
                                                showDialog("用户名称或者密码错误，请重新输入！");  
                                        }  
                                }  
                        }  
                });  
        }  
  
  
        private boolean login() {  
                String username = userEditText.getText().toString();  
                String pwd = pwdEditText.getText().toString();  
                String result = query(username, pwd);  
                if (result != null && result.equals("1")) {  
                        return true;  
                } else {  
                        return false;  
                }  
        }  
  
  
        private boolean validate() {  
                String username = userEditText.getText().toString();  
                if (username.equals("") && username == null) {  
                        showDialog("用户名称是必填项！");  
                        return false;  
                }  
                String pwd = pwdEditText.getText().toString();  
                if (pwd.equals("")) {  
                        showDialog("用户密码是必填项！");  
                        return false;  
                }  
                return true;  
        }  
  
  
        private void showDialog(String msg) {  
                AlertDialog.Builder builder = new AlertDialog.Builder(this);  
                builder.setMessage(msg).setCancelable(false).setPositiveButton("确定",  
                                new DialogInterface.OnClickListener() {  
                                        public void onClick(DialogInterface dialog, int id) {  
                                        }  
                                });  
                AlertDialog alert = builder.create();  
                alert.show();  
        }  
  
  
        private String query(String username, String password) {  
                String queryString = "username=" + username + "&password=" + password;  
                String url = HttpUtil.BASE_URL + "servlet/ServiceTest?" + queryString;  
                return HttpUtil.queryStringForGet(url);  
        }  
}  

服务端的主要代码：

[java]view plain copy
package com.server.an;  
  
  
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;  
  
  
/** 
*  
* Android客户端发来的请求 
*/  
@SuppressWarnings("serial")  
public class ServiceTest extends HttpServlet {  
  
  
        public void doGet(HttpServletRequest request, HttpServletResponse response)  
                        throws ServletException, IOException {  
                System.out.println("do Get");  
                response.setContentType("text/html");  
                response.setCharacterEncoding("utf-8");  
                PrintWriter out = response.getWriter();  
                UserDao dao = new UserDaoImpl();  
                // 获得客户端请求参数  
                String username = request.getParameter("username");  
                String password = request.getParameter("password");  
  
  
                User u = dao.login(username, password);  
                if (u != null) {  
                        // 响应客户端内容，登录成功  
                        //out.print("登录成功");  
                        out.print("登录成功");  
                } else {  
                        // 响应客户端内容，登录失败  
                        out.print("登录失败");  
                }  
                out.flush();  
                out.close();  
        }  
  
  
        public void doPost(HttpServletRequest request, HttpServletResponse response)  
                        throws ServletException, IOException {  
                System.out.println("do Post");  
                String username = request.getParameter("username");  
                PrintWriter out = response.getWriter();  
                UserDao dao = new UserDaoImpl();  
                // 获得客户端请求参数  
                String password = request.getParameter("password");  
  
  
                User u = dao.login(username, password);  
                if (u != null) {  
                        // 响应客户端内容，登录成功  
                        //out.print("登录成功");  
                        response.sendRedirect("/AndroidServer/success.jsp");  
                } else {  
                        // 响应客户端内容，登录失败  
                        out.print("登录失败");  
                }  
                out.flush();  
                out.close();  
        }  
  
  
        public void init() throws ServletException {  
        }  
  
  
        public ServiceTest() {  
                super();  
        }  
  
  
        public void destroy() {  
                super.destroy();  
        }  
  
  
}  

源码下载： http://download.csdn.net/detail/xzr1526/7202127
转载请注明出处： http://blog.csdn.net/dennisxzr/article/details/23847073 （来自Dennis锐少的csdn博客）

Android使用jsp+sevlet+mysql实现简单的前后台登录系统

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