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：

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：

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）

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