登录注册代码
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- 服务器的建立
- 服务器中的代码
- 浏览器代码
- MyHttpManager代码
- Main代码
- 注册界面的代码
文本文档流程图
服务器的建立
1、右键在web里面找到Dynamic web project，建立一个服务器，在Java Resources中建一个一个包，写入需要用到的代码，还需要在这个包里建一个servlet(里面包含了DoGet和DoPost的方法)然后导入所需的jar包。在这个程序中需要导入json_jar包和mysql_jdbc.jar包(导入到WebContent下的WEB-INF下的lib里面)。
服务器中的代码
**********************SQLManager***************public class SQLManager { private static SQLManager manager; private Connection connection; public Connection getConnection() { return connection; } public static synchronized SQLManager newInstance(){ if(manager==null){ manager=new SQLManager(); } return manager; } private SQLManager(){ String driver="com.mysql.jdbc.Driver"; String url="jdbc:mysql://localhost:3306/clazz"; String user="root"; String password="654321"; try { Class.forName(driver); connection=DriverManager.getConnection(url, user, password); connection.createStatement(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } } *************************SQLOperate***************** public class SQLOperate { public static final int SUCESS=0; public static final int ERRO=1; private SQLOperate(){ } private static SQLOperate operate; public static synchronized SQLOperate newInstance(){ if(operate==null){ operate=new SQLOperate(); } return operate; } public String register(String userName,String password){ JSONObject obj=new JSONObject(); Connection conn=SQLManager.newInstance().getConnection(); try { PreparedStatement state=conn.prepareStatement("select * from user where user_name=?"); state.setString(1, userName); ResultSet set=state.executeQuery(); set.last(); int num=set.getRow(); if(num>0){ obj.put("code", 1); obj.put("message", "该用户名已被注册"); return obj.toString(); } PreparedStatement state1=conn.prepareStatement("insert into user (user_name,user_password)values(?,?)"); state1.setString(1, userName); state1.setString(2, password); state1.execute(); obj.put("code", 0); obj.put("message", "成功注册"); } catch (SQLException e) { obj.put("code", 1); obj.put("message", "注册失败"); e.printStackTrace(); } return obj.toString(); } public String login(String userName,String password){ System.out.println("服务器查询数据库"+userName+password); JSONObject obj=new JSONObject(); Connection conn=SQLManager.newInstance().getConnection(); try { PreparedStatement state=conn.prepareStatement("select * from user where user_name=?"); state.setString(1, userName); ResultSet set=state.executeQuery(); set.last(); int num=set.getRow(); if(num==0){ obj.put("code", 1); obj.put("message", "用户名错误"); return obj.toString(); } PreparedStatement state2=conn.prepareStatement("select * from user where user_name=? and user_password=?"); state2.setString(1, userName); state2.setString(2, password); ResultSet set2=state2.executeQuery(); set2.last(); int num2=set2.getRow(); if(num2>0){ obj.put("code", 0); obj.put("message", "登录成功"); return obj.toString(); } } catch (SQLException e) { obj.put("code", 1); obj.put("message", "登录失败"); e.printStackTrace(); } return obj.toString(); } public String select(){ JSONObject obj=new JSONObject(); Connection conn=SQLManager.newInstance().getConnection(); try { PreparedStatement state=conn.prepareStatement("select * from user"); ResultSet set=state.executeQuery(); set.first(); JSONArray array=new JSONArray(); while(!set.isAfterLast()){ JSONObject item=new JSONObject(); item.put("password",set.getString("user_password")); item.put("username", set.getString("user_name")); array.add(item); set.next(); } obj.put("code", 0); obj.put("message", "查询成功"); obj.put("data", array); } catch (SQLException e) { obj.put("code", 1); obj.put("message", "查询失败"); e.printStackTrace(); } return obj.toString(); } *************************Register****************** public class Register {public void register(){ }}********************MyTestServerlet********************import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import net.sf.json.JSONObject;/** * Servlet implementation class MyTestServerlet */@WebServlet("/MyTestServerlet")public class MyTestServerlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public MyTestServerlet() { super(); // TODO Auto-generated constructor stub } /** * @see/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String json=request.getParameter("json"); String back="";// {type:"register",data:{username:"zhangsan",password:"123456"}} System.out.println("得到的数据:"+json); //创建json对象，传入json数据 JSONObject obj=JSONObject.fromObject(json); String type=obj.getString("type"); if(type.equals(Config.REGISTER)){ JSONObject data=obj.getJSONObject("data"); String userName=data.getString("username"); String password=data.getString("password"); back=SQLOperate.newInstance().register(userName, password); }else if(type.equals("Login")){ JSONObject data=obj.getJSONObject("data"); String userName=data.getString("username"); String password=data.getString("password"); back=SQLOperate.newInstance().login(userName, password); }else if(type.equals("Select")){ back=SQLOperate.newInstance().select(); } response.setHeader("Content-type", "text/html;charset=UTF-8"); //让浏览器以utf-8编码格式解析 response.getWriter().append(back); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }******************Encoding*****************public class Encoding { public static String doEncoding(String string) { if(string==null){ return null; } try { byte[] array = string.getBytes("ISO-8859-1"); string = new String(array, "UTF-8"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } return string; } **************Config********************* public class Config { /**注册的类型*/ public static final String REGISTER="register";}浏览器代码
**************MyHttpMethod*************public class MyHttpMethod { private MyHttpMethod() { } private static MyHttpMethod manager; public static synchronized MyHttpMethod newInstance() { if (manager == null) { manager = new MyHttpMethod(); } return manager; } public String register(String username, String password) { String url = "http://localhost:8080/MyServerTest/MyTestServerlet"; HttpClientBuilder builder = HttpClientBuilder.create(); builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS); HttpClient client = builder.build(); HttpPost post = new HttpPost(url);// 设置为Post方法 JSONObject obj = new JSONObject();// {} obj.put("type", "register");// {type:"register"} JSONObject data = new JSONObject();// {} data.put("username", username);// {username:"zhangsan"} data.put("password", password);// {username:"zhangsan",password:"123456"} obj.put("data", data);// {type:"register",data:{username:"zhangsan",password:"123456"}} NameValuePair pair1 = new BasicNameValuePair("json", obj.toString()); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); try { post.setEntity(new UrlEncodedFormEntity(params, "utf-8")); // 设置服务器接收后数据的读取方式为UTF-8 post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); //执行Post方法得到服务器返回的所有数据都在response中 HttpResponse response = client.execute(post); int code = response.getStatusLine().getStatusCode();// 得到状态码 if (code == HttpURLConnection.HTTP_OK) { HttpEntity entity = response.getEntity();// 得到数据的实体 InputStream is = entity.getContent();// 得到输入流 BufferedReader br = new BufferedReader(new InputStreamReader(is)); String line = br.readLine(); //带有缓冲区的字符串是可变的，append方法是字符连接 StringBuffer buffer = new StringBuffer(); while (line != null) { buffer.append(line); System.out.println(line); line = br.readLine(); } return buffer.toString(); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (UnsupportedOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } public String login(String username, String password) { System.out.println("客户端传输"+username+password); String url = "http://localhost:8080/MyServerTest/MyTestServerlet"; HttpClientBuilder builder = HttpClientBuilder.create(); builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS); HttpClient client = builder.build(); HttpPost post = new HttpPost(url);// 设置为Post方法 JSONObject obj = new JSONObject();// {} obj.put("type", "Login");// {type:"Login"} JSONObject data = new JSONObject();// {} data.put("username", username);// {username:"zhangsan"} data.put("password", password);// {username:"zhangsan",password:"123456"} obj.put("data", data);// {type:"register",data:{username:"zhangsan",password:"123456"}} NameValuePair pair1 = new BasicNameValuePair("json", obj.toString()); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); try { post.setEntity(new UrlEncodedFormEntity(params, "utf-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); HttpResponse response = client.execute(post); int code = response.getStatusLine().getStatusCode();// 得到状态码 if (code == HttpURLConnection.HTTP_OK) { HttpEntity entity = response.getEntity();// 得到数据的实体 InputStream is = entity.getContent();// 得到输入流 BufferedReader br = new BufferedReader(new InputStreamReader(is)); String line = br.readLine(); StringBuffer buffer = new StringBuffer(); while (line != null) { buffer.append(line); System.out.println(line); line = br.readLine(); } return buffer.toString(); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (UnsupportedOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } public String select() { String url = "http://localhost:8080/MyServerTest/MyTestServerlet"; HttpClientBuilder builder = HttpClientBuilder.create(); builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS); HttpClient client = builder.build(); HttpPost post = new HttpPost(url); JSONObject obj = new JSONObject();// {} obj.put("type", "Select");// {type:"Select"} NameValuePair pair1 = new BasicNameValuePair("json", obj.toString()); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); try { post.setEntity(new UrlEncodedFormEntity(params, "utf-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); HttpResponse response = client.execute(post); int code = response.getStatusLine().getStatusCode();// 得到状态码 if (code == HttpURLConnection.HTTP_OK) { HttpEntity entity = response.getEntity();// 得到数据的实体 InputStream is = entity.getContent();// 得到输入流 BufferedReader br = new BufferedReader(new InputStreamReader(is)); String line = br.readLine(); StringBuffer buffer = new StringBuffer(); while (line != null) { buffer.append(line); System.out.println(line); line = br.readLine(); } return buffer.toString(); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (UnsupportedOperationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }}MyHttpManager代码
public class MyHttpManager { private MyHttpManager() { } private static MyHttpManager manager; public static synchronized MyHttpManager newInstance() { if (manager == null) { manager = new MyHttpManager(); } return manager; }}Main代码
package com.lingzhuo.register;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import com.lingzhuo.http.MyHttpMethod;import javax.swing.JTextField;import javax.swing.JLabel;import javax.swing.JButton;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;public class MainJFrame extends JFrame { private JPanel contentPane; private JTextField textField; private JTextField textField_1; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { MainJFrame frame = new MainJFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public MainJFrame() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 477, 343); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textField = new JTextField(); textField.setBounds(189, 54, 149, 47); contentPane.add(textField); textField.setColumns(10); textField_1 = new JTextField(); textField_1.setBounds(189, 165, 153, 47); contentPane.add(textField_1); textField_1.setColumns(10); JLabel lblNewLabel = new JLabel("用户名"); lblNewLabel.setBounds(89, 70, 70, 23); contentPane.add(lblNewLabel); JLabel lblNewLabel_1 = new JLabel("密码"); lblNewLabel_1.setBounds(89, 181, 82, 23); contentPane.add(lblNewLabel_1); JButton btnNewButton = new JButton("登录"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String message=MyHttpMethod.newInstance().login(textField.getText(),textField_1.getText());// System.out.println(message); } }); btnNewButton.setBounds(211, 233, 102, 31); contentPane.add(btnNewButton); JButton btnNewButton_1 = new JButton("注册"); btnNewButton_1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { EventQueue.invokeLater(new Runnable() { public void run() { try { Register frame = new Register(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } }); btnNewButton_1.setBounds(125, 274, 93, 23); contentPane.add(btnNewButton_1); JButton btnNewButton_2 = new JButton("忘记密码"); btnNewButton_2.setBounds(280, 274, 93, 23); contentPane.add(btnNewButton_2); JButton btnNewButton_3 = new JButton("查询所有用户"); btnNewButton_3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String message=MyHttpMethod.newInstance().select();// System.out.println(message); } }); btnNewButton_3.setBounds(358, 28, 93, 23); contentPane.add(btnNewButton_3); }}注册界面的代码
public class Register extends JFrame { private JPanel contentPane; private JTextField textField; private JTextField textField_1; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { Register frame = new Register(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public Register() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textField = new JTextField(); textField.setBounds(150, 44, 185, 51); contentPane.add(textField); textField.setColumns(10); textField_1 = new JTextField(); textField_1.setBounds(159, 138, 176, 45); contentPane.add(textField_1); textField_1.setColumns(10); JButton btnNewButton = new JButton("注册"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String message=MyHttpMethod.newInstance().register(textField.getText(), textField_1.getText());// System.out.println(message); } }); btnNewButton.setBounds(201, 209, 101, 29); contentPane.add(btnNewButton); JLabel lblNewLabel = new JLabel("用户名"); lblNewLabel.setBounds(64, 62, 76, 22); contentPane.add(lblNewLabel); JLabel lblNewLabel_1 = new JLabel("密码"); lblNewLabel_1.setBounds(62, 153, 78, 30); contentPane.add(lblNewLabel_1); }}注意：
先运行MyTestServerlet在运行 MainJFrame
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