JAVA基础一大堆0813Web项目
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说起来太麻烦了，直接上图。
服务器代码
import java.io.IOException;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;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 MyTestServlet */@WebServlet("/MyTestServlet")public class MyTestServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public MyTestServlet() { super(); } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String json = request.getParameter("json"); if (json != null) { System.out.println(json); JSONObject obj=JSONObject.fromObject(json);//jar包要放在WebContent/WEB-INF/lib包里！ String type = obj.getString("type"); String back=""; if (type.equals(Config.REGISTER)) { JSONObject data = obj.getJSONObject("data"); String userName = data.getString("username"); String password = data.getString("password"); System.out.println(userName + password); back=SQLOperate.newInstance().register(userName, password); // 让浏览器以UTF-8编码格式解析 response.setHeader("Content-type", "text/html;charset=UTF-8"); response.getWriter().append(back);// 输出，返回给客户端 }else if(type.equals(Config.SIGN_IN)){ JSONObject data = obj.getJSONObject("data"); String userName = data.getString("username"); String password = data.getString("password"); System.out.println(userName + password); back=SQLOperate.newInstance().signIn(userName, password); }else if(type.equals(Config.SELECT_ALL)){ back=SQLOperate.newInstance().selectAll(); } response.setHeader("Content-type", "text/html;charset=UTF-8"); response.getWriter().append(back);// 输出，返回给客户端 } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}//configpublic class Config { public static final String REGISTER="register"; public static final String SELECT_ALL="selectall"; public static final String SIGN_IN="signin";}//封装的方法import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import org.eclipse.jdt.internal.compiler.lookup.PackageBinding;import net.sf.json.JSONArray;import net.sf.json.JSONObject;public class SQLOperate { public static final int SUCCESS = 0; public static final int FAIL = 1; public static final int ERROR = 2; private SQLOperate() { } private static SQLOperate operate; public static synchronized SQLOperate newInstance() { if (operate == null) { operate = new SQLOperate(); } return operate; } /** * 实现客户端在服务器的注册 * * @param userName * 传入客户端输入的用户名 * @param password * 传入客户端输入的密码 * @return 返回发送给客户端的字符串 */ public String register(String userName, String password) { JSONObject obj = new JSONObject(); String back = ""; Connection conn = SQLManager.newInstance().getConnection(); try { PreparedStatement state1 = conn.prepareStatement("select * from user where name=?"); state1.setString(1, userName); ResultSet set = state1.executeQuery(); set.last(); int num = set.getRow(); System.out.println(num); if (num == 1) { obj.put("code", ERROR); obj.put("result", "该账号已注册"); } else { //必须加else，不加的话就算是已经注册的账户，下面的程序继续执行重复添加 PreparedStatement state = conn.prepareStatement("insert into user(name,password)values(?,?)"); state.setString(1, userName); state.setString(2, password); state.execute(); obj.put("code", SUCCESS); obj.put("result", "注册成功"); } } catch (SQLException e1) { obj.put("code", FAIL); obj.put("result", "注册失败"); e1.printStackTrace(); } return obj.toString(); } /** * 登录服务器 * * @param userName * 传入客户端的用户名 * @param password * 传入客户端的密码 * @return 返回服务器传出的数据 */ public String signIn(String userName, String password) { JSONObject obj = new JSONObject(); Connection conn = SQLManager.newInstance().getConnection(); try { PreparedStatement state = conn.prepareStatement("select * from user where name=?"); state.setString(1, userName); ResultSet set = state.executeQuery(); set.last(); int num = set.getRow(); if (num == 0) { obj.put("code", ERROR); obj.put("result", "用户名错误"); } //这个就不必加else语句了，因为找不到相应的用户，所以下面的程序不会执行 PreparedStatement state1 = conn.prepareStatement("select * from user where name=? and password=?"); state1.setString(1, userName); state1.setString(2, password); ResultSet set1 = state1.executeQuery(); set1.last(); int num1 = set1.getRow(); if (num1 == 1) { obj.put("code", SUCCESS); obj.put("result", "登录成功"); } } catch (SQLException e) { obj.put("code", FAIL); obj.put("result", "登录失败"); e.printStackTrace(); } return obj.toString(); } /** * 输出服务器数据库的所有内容 */ public String selectAll() { JSONObject obj = new JSONObject(); Connection conn = SQLManager.newInstance().getConnection(); try { PreparedStatement state = (PreparedStatement) conn.prepareStatement("select * from user"); ResultSet set = state.executeQuery(); set.first(); JSONArray array = new JSONArray(); while (!set.isAfterLast()) { JSONObject item = new JSONObject(); item.put("username", set.getString("name")); item.put("password", set.getString("password")); array.add(item); set.next(); obj.put("code", SUCCESS); obj.put("message", "查询成功"); obj.put("data", array); } } catch (SQLException e) { obj.put("code", FAIL); obj.put("message", "查询失败"); e.printStackTrace(); } return obj.toString(); }}客户端代码
//主界面import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.util.ArrayList;import java.util.concurrent.TimeUnit;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.StatusLine;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.HttpClientBuilder;import org.apache.http.message.BasicNameValuePair;import net.sf.json.JSONObject;import javax.swing.JTextField;import javax.swing.JButton;public class SignInDoPost extends JFrame { private JPanel contentPane; private JTextField textFieldName; private JTextField textFieldPassword; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { SignInDoPost frame = new SignInDoPost(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public SignInDoPost() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 445, 349); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textFieldName = new JTextField(); textFieldName.setBounds(131, 42, 156, 45); contentPane.add(textFieldName); textFieldName.setColumns(10); textFieldPassword = new JTextField(); textFieldPassword.setBounds(131, 97, 156, 41); contentPane.add(textFieldPassword); textFieldPassword.setColumns(10); JButton btnSignIn = new JButton("登录"); btnSignIn.setBounds(131, 157, 156, 23); contentPane.add(btnSignIn); btnSignIn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String userName = textFieldName.getText(); String password = textFieldPassword.getText(); String message=DoPostMethod.newInstance().signIn(userName, password); System.out.println(message); } }); JButton btnRegister = new JButton("注册"); btnRegister.setBounds(131, 190, 156, 23); contentPane.add(btnRegister); btnRegister.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { EventQueue.invokeLater(new Runnable() { public void run() { try { RegisterDoPost frame = new RegisterDoPost(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } }); JButton btnUpdatePassword = new JButton("全部显示"); btnUpdatePassword.setBounds(131, 223, 156, 23); contentPane.add(btnUpdatePassword); btnUpdatePassword.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String message=DoPostMethod.newInstance().selectAll(); System.out.println(message); } }); }}
//注册界面import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.util.ArrayList;import java.util.concurrent.TimeUnit;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.xml.crypto.dsig.keyinfo.KeyValue;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.StatusLine;import org.apache.http.client.ClientProtocolException;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.HttpClientBuilder;import org.apache.http.message.BasicNameValuePair;import net.sf.json.JSONObject;import javax.swing.JButton;import javax.swing.JTextField;import javax.swing.JLabel;public class RegisterDoPost extends JFrame { private JPanel contentPane; private JTextField textFieldUserName; private JTextField textFieldPassword; public RegisterDoPost() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 438, 321); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JButton btnSignIn = new JButton("注册"); btnSignIn.setBounds(136, 144, 136, 23); contentPane.add(btnSignIn); btnSignIn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String userName = textFieldUserName.getText(); String password = textFieldPassword.getText(); String message=DoPostMethod.newInstance().register(userName, password); System.out.println(message); } }); textFieldUserName = new JTextField(); textFieldUserName.setBounds(136, 52, 136, 36); contentPane.add(textFieldUserName); textFieldUserName.setColumns(10); textFieldPassword = new JTextField(); textFieldPassword.setBounds(136, 98, 136, 36); contentPane.add(textFieldPassword); textFieldPassword.setColumns(10); JLabel lblNewLabel = new JLabel("用户名"); lblNewLabel.setBounds(64, 62, 67, 15); contentPane.add(lblNewLabel); JLabel lblNewLabel_1 = new JLabel("密码"); lblNewLabel_1.setBounds(64, 108, 73, 15); contentPane.add(lblNewLabel_1); }}
//封装的方法import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.util.ArrayList;import java.util.concurrent.TimeUnit;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.StatusLine;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.HttpClientBuilder;import org.apache.http.message.BasicNameValuePair;import net.sf.json.JSONObject;public class DoPostMethod { private DoPostMethod() { } private static DoPostMethod method; public static synchronized DoPostMethod newInstance() { if (method == null) { method = new DoPostMethod(); } return method; } /** * 客户端注册方法 * @param userName 传递客户端的账户名 * @param password 传递客户端的密码 * @return 返回客户端读入的信息 */ public String register(String userName, String password) { String urlString = "http://localhost:8080/MyServiceTest/MyTestServlet"; // 创建HttpClient对象 HttpClientBuilder builder = HttpClientBuilder.create(); // HttpClient HttpClient client = builder.build(); // 设置延时时间 builder.setConnectionTimeToLive(30000, TimeUnit.MILLISECONDS); JSONObject obj = new JSONObject(); obj.put("type", "register"); JSONObject data = new JSONObject(); data.put("username", userName); data.put("password", password); obj.put("data", data); String json = obj.toString(); // 设置传入的数据 NameValuePair pair1 = new BasicNameValuePair("json", json); // NameValuePair pair2 = new BasicNameValuePair("password", // "123456"); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); // params.add(pair2); try { // 设置Post方法 HttpPost post = new HttpPost(urlString); // 设置传递的参数格式 post.setEntity(new UrlEncodedFormEntity(params, "UTF-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // 执行post方法获得服务器返回的所有数据 HttpResponse response = client.execute(post); // HttpClient获得服务器返回的表头。 StatusLine statusLine = response.getStatusLine(); // 获得状态码 int code = statusLine.getStatusCode(); System.out.println(code); if (code == HttpURLConnection.HTTP_OK) { // 得到数据的实体。 HttpEntity entity = response.getEntity(); // 得到数据的输入流。 InputStream is = entity.getContent(); 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();//缓冲 while(line!=null){ buffer.append(line);//追加// System.out.println(line); line=br.readLine(); } return buffer.toString();// JSONObject back = JSONObject.fromObject(s);// int backCode = back.getInt("code");// System.out.println(backCode);// if (backCode == 0) {// String succ = back.getString("result");// System.out.println(succ);// } else if (backCode == 1) {// String fall = back.getString("result");// System.out.println(fall);// } else if (backCode == 2) {// String exists = back.getString("result");// System.out.println(exists);// } } } catch (UnsupportedEncodingException e2) { e2.printStackTrace(); } catch (UnsupportedOperationException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } return null; } /** * 客户端登录的方法 * @param userName 传递客户端输入的用户名 * @param password 传递客户端输入的密码 * @return */ public String signIn(String userName, String password) { String urlString = "http://localhost:8080/MyServiceTest/MyTestServlet"; // 创建HttpClient对象 HttpClientBuilder builder = HttpClientBuilder.create(); // HttpClient HttpClient client = builder.build(); // 设置延时时间 builder.setConnectionTimeToLive(30000, TimeUnit.MILLISECONDS); JSONObject obj = new JSONObject(); obj.put("type", "signin"); JSONObject data = new JSONObject(); data.put("username", userName); data.put("password", password); obj.put("data", data); String json = obj.toString(); // 设置传入的数据 NameValuePair pair1 = new BasicNameValuePair("json", json); // NameValuePair pair2 = new BasicNameValuePair("password", // "123456"); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); // params.add(pair2); try { // 设置Post方法 HttpPost post = new HttpPost(urlString); // 设置传递的参数格式 post.setEntity(new UrlEncodedFormEntity(params, "UTF-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // 执行post方法获得服务器返回的所有数据 HttpResponse response = client.execute(post); // HttpClient获得服务器返回的表头。 StatusLine statusLine = response.getStatusLine(); // 获得状态码 int code = statusLine.getStatusCode(); System.out.println(code); if (code == HttpURLConnection.HTTP_OK) { // 得到数据的实体。 HttpEntity entity = response.getEntity(); // 得到数据的输入流。 InputStream is = entity.getContent(); 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 e2) { e2.printStackTrace(); } catch (UnsupportedOperationException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } return null; } /** * 查询服务器中指定数据库的所有内容 * @return */ public String selectAll() { String urlString = "http://localhost:8080/MyServiceTest/MyTestServlet"; // 创建HttpClient对象 HttpClientBuilder builder = HttpClientBuilder.create(); // HttpClient HttpClient client = builder.build(); // 设置延时时间 builder.setConnectionTimeToLive(30000, TimeUnit.MILLISECONDS); JSONObject obj = new JSONObject(); obj.put("type", "selectall"); String json = obj.toString(); // 设置传入的数据 NameValuePair pair1 = new BasicNameValuePair("json", json); // NameValuePair pair2 = new BasicNameValuePair("password", // "123456"); ArrayList<NameValuePair> params = new ArrayList<>(); params.add(pair1); // params.add(pair2); try { // 设置Post方法 HttpPost post = new HttpPost(urlString); // 设置传递的参数格式 post.setEntity(new UrlEncodedFormEntity(params, "UTF-8")); post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // 执行post方法获得服务器返回的所有数据 HttpResponse response = client.execute(post); // HttpClient获得服务器返回的表头。 StatusLine statusLine = response.getStatusLine(); // 获得状态码 int code = statusLine.getStatusCode(); System.out.println(code); if (code == HttpURLConnection.HTTP_OK) { // 得到数据的实体。 HttpEntity entity = response.getEntity(); // 得到数据的输入流。 InputStream is = entity.getContent(); 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 e2) { e2.printStackTrace(); } catch (UnsupportedOperationException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } return null; }} 本人较懒333，最后的客户端输入JSON解析没有写，命令结果显示在界面上也没有写╮(╯▽╰)╭
最终效果…动态图太大没法显示，也是醉了。不是说好的2M么，怎么1.5M都传不了=。=,试了好多次终于是传上来了，不容易啊╮(╯▽╰)╭
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