一、服务器端实现
（1）创建动态服务器项目
个部分代码如下：
package com.lc.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnectionUtil {
/**
* 打开连接
*
* @return
*/
public static Connection open() {
// 1.url
// 2.driver
// 3.username
// 4.password
// 配置文件xml 属性文件Properties
String driver = "com.mysql.jdbc.Driver";
String url = "jdbc:mysql://localhost:3306/wiressorder?useUnicode=true&characterEncoding=gbk";
String username = "xuuu";
String password = "1234567890";
try {
Class.forName(driver);
return DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
/**
* 关闭连接
*
* @param conn
*/
public static void close(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
package com.lc.dao;
/*
* 对应数据库中的user表
*
* Entity Class或者是JavaBean---UserTabl ORM
*/
public class User {
private String username;
private String password;
private int id;
/*
* 无参的构造方法
*/
public User() {
super();
}
/*
* 有参的构造方法
*/
public User(String username, String password, int id) {
super();
this.username = username;
this.password = password;
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
}
package com.lc.dao;
/*
* UserDao接口
*
* 定义于User有关的方法
*/
public interface UserDao {
// 实现用户登录
public User login(String username, String password);
}
package com.lc.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
/*
* 用于实现UserDao中定义的方法
*
* 接口的实现类
*/
public class UserDaoImpl implements UserDao {
@Override
public User login(String username, String password) {
Connection connection = ConnectionUtil.open();
String sql = "select id,username,password from UserTbl where username=? and password=?";
try {
// 预查寻
PreparedStatement pstmt = connection.prepareStatement(sql);
pstmt.setString(1, username);
pstmt.setString(2, password);
ResultSet rs = pstmt.executeQuery();
if (rs.next()) {
int id = rs.getInt(1); // 获得一个用户的id
User user = new User();
// 设置数据
user.setId(id);
user.setUsername(username);
user.setPassword(password);
return user;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
ConnectionUtil.close(connection);
}
return null;
}
}
package com.lc.servlet;
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;
import com.lc.dao.User;
import com.lc.dao.UserDao;
import com.lc.dao.UserDaoImpl;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginServlet() {
super();
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response); // 都执行dopost
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=utf8"); // 设置编码方式
PrintWriter out = response.getWriter();
// 获得登录的请求信息
String username = request.getParameter("username");
String password = request.getParameter("password");
// 打印出来测试：http://localhost:8080/WiressOrderServer/LoginServlet?username=tom&password=123
// System.out.println("username:" + username + "password:" + password);
UserDao userDao = new UserDaoImpl();
User user = userDao.login(username, password);
if (user != null) {
System.out.println("username:" + user.getUsername() + "password:"+ user.getPassword());
out.println("username:" + user.getUsername() + "password:"+ user.getPassword());
} else {
System.out.println("没有你所要的用户，登录失败！");
out.println("没有你所要的用户，登录失败！");
}
out.flush();
out.close();
}
}
二、客户端实现
布局文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/tv_username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/login_password" />
<EditText
android:id="@+id/ed_username"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName" />
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/tv_password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/login_username" />
<EditText
android:id="@+id/ed_password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword" >
<requestFocus />
</EditText>
</LinearLayout>
<Button
android:id="@+id/login_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/login_loginbutton" />
</LinearLayout>
package com.xuliugen.wiressorderclient;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
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.util.EntityUtils;
public class HttpUtil {
public static String doPost(String url, List<NameValuePair> list) {
HttpPost post = new HttpPost(url);
HttpEntity entity = null;
if (list != null) {
try {
entity = new UrlEncodedFormEntity(list, "gbk");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
post.setEntity(entity);
}
HttpClient client = new DefaultHttpClient();
try {
HttpResponse response = client.execute(post);
if (response.getStatusLine().getStatusCode() == 200) {
String result = EntityUtils.toString(response.getEntity());
// save SharedPre...
result = new String(result.getBytes("iso-8859-1"), "gbk");
System.out.println(result);
return result;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
package com.xuliugen.wiressorderclient;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity {
private EditText usernameEditText, passwordEditText;
private Button login_button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
usernameEditText = (EditText) this.findViewById(R.id.ed_username);
passwordEditText = (EditText) this.findViewById(R.id.ed_password);
login_button = (Button) this.findViewById(R.id.login_button);
login_button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String url = "http://172.23.252.89:8080/WiressOrderServer/LoginServlet";
// 执行异步任务
new MyTask().execute(url);
}
});
}
String doLogin(String url) {
String username = usernameEditText.getText().toString();
String password = passwordEditText.getText().toString();
// 1.apache client
List<NameValuePair> list = new ArrayList<NameValuePair>();
NameValuePair p1 = new BasicNameValuePair("username", username);
NameValuePair p2 = new BasicNameValuePair("password", password);
list.add(p1);
list.add(p2);
String msg = HttpUtil.doPost(url, list);
return msg;
}
// 多线程的使用：hander、Asynctask
class MyTask extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... params) {
String url = params[0];
String result = doLogin(url);
return result;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// 1.保存信息
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT)
.show();
}
}
}
时间： 2024-08-08 17:16:24