Android+Apache+Servlet+MySQL简易粗糙Mini登录器实现

private Button login;

login.setOnClickListener(new View.OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
login();
}

});

private static final String ServletUri= http://XXX.XXX.XXX.XXX:8080/MyClub/Login;[/code] 其中ServletUri中的MyClub是下文建立Servlet的Web Project项目工程名，Login是Servlet名称，这都是默认的，你可以改的，保持大小写哟~

public void login(){
post = new HttpPost(ServletUri);
List<NameValuePair> param = new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("username",userName.getText().toString()));
param.add(new BasicNameValuePair("userpwd",userPwd.getText().toString()));
try {
post.setEntity(new UrlEncodedFormEntity(param,HTTP.UTF_8));
try {
HttpResponse response = new DefaultHttpClient().execute(post);
if(response.getStatusLine().getStatusCode() == 201){
Toast.makeText(MainActivity.this, "登录成功", Toast.LENGTH_LONG).show();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

先不要怀疑response.getStatusLine().getStatusCode() == 201 为什么为201 这是我乱设的哈~

③新建一个Web Project工程，我取名为MyClub，记住你的机器要安装Apache Tomcat哟

添加一个Servlet，我取名为Login

如果你发现你新建的web project工程里诸如这种

package com.xj.servlet;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class Login
*/
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String DRIVER = "com.mysql.jdbc.Driver";
private static final String CONNECT = "jdbc:MySQL://localhost:3306/XXX";    //XXX为你的数据库名称
private String baseName = "XXX";       //XXX为你的数据库账号
private String basePwd = "XXX";   //XXX为你的数据库密码
private Connection con;
private Statement statement;
/**
* @see HttpServlet#HttpServlet()
*/
public Login() {
super();
// TODO Auto-generated constructor stub
try {
Class.forName(DRIVER);
con = DriverManager.getConnection(CONNECT,baseName,basePwd);
statement = con.createStatement();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String username = request.getParameter("username");
String userpwd = request.getParameter("userpwd");
try {
ResultSet rs = statement.executeQuery("select * from user where username='" + username +"' and userpwd='" + userpwd + "'");
rs.beforeFirst();
if(rs.next()){
response.setStatus(201);    //这个201就是与上面那个login()方法那个乱设的201的编码相对应啦~
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}


import javax.servlet.http.HttpServlet;导入说找不到你可以在你web project下WebContent/WEB-INF/lib下添加这两个库jsp-api.jarservlet-api.jar这两个库在\Tomcat 6.0\lib\下呆着呢

④这时候设计数据库了，我用的是MySQL，用Navicat For MySQL可视化操作MySQL快点

账号密码就是③中的XXX啦

新建连接->新建数据库XXX->新建一张表，我的表名叫user

username                       int                          5                      0            主键          自动递增      无符号      填充0

userpwd                        varchar                  10                     0

⑤OK，这时候Run一下这个Web Project，然后运行下Android工程吧，如果账户密码符合就会有个Toast告诉你登陆成功哟！