From 9a5f8c7a9022b03b1ca4cc3d00b99f0aa7a0c2ff Mon Sep 17 00:00:00 2001 From: Xi Xu Date: Tue, 2 Jul 2024 15:17:40 +0800 Subject: [PATCH] a --- src/client/Client.java | 4 +- src/server/Server.java | 20 ++-- src/server/dao/UserDAO.java | 52 +++++----- src/server/thread/HandleThread.java | 107 ++++++++------------ src/server/tools/DBConnection.java | 29 +++--- src/server/tools/ExportToCSV.java | 45 ++++---- src/server/tools/ExportToXLS.java | 55 +++++----- src/server/tools/crawling/Book.java | 3 +- src/server/tools/crawling/CrawlerTools.java | 58 +++-------- src/server/tools/crawling/Driver.java | 33 ++++-- src/server/tools/crawling/NewsThread.java | 87 +++++++--------- src/server/vo/User.java | 5 - 12 files changed, 230 insertions(+), 268 deletions(-) diff --git a/src/client/Client.java b/src/client/Client.java index 1da79b5..0ff86d4 100644 --- a/src/client/Client.java +++ b/src/client/Client.java @@ -79,10 +79,10 @@ public class Client { update(); break; case 6: - ExportToCSV.to(); + ExportToCSV.to("output.csv", "select * from book"); break; case 7: - ExportToXLS.to(); + ExportToXLS.to("select * from book", "output.xls"); break; default: break; diff --git a/src/server/Server.java b/src/server/Server.java index ad5af49..a04911b 100644 --- a/src/server/Server.java +++ b/src/server/Server.java @@ -6,14 +6,18 @@ import java.net.Socket; import server.thread.HandleThread; public class Server { - public static void main(String[] args) throws Exception { - int port = 9999; - ServerSocket server = new ServerSocket(port); - System.out.println("The server is listening for client connection requests on port " + port + "."); - while (true) { - Socket socket = server.accept(); - System.out.println("Client " + socket.getInetAddress().getHostAddress() + " successfully connected!"); - new HandleThread(socket).start(); + private static final int PORT = 9999; + + public static void main(String[] args) { + try (ServerSocket server = new ServerSocket(PORT)) { + System.out.println("Server listening on port " + PORT); + while (true) { + Socket clientSocket = server.accept(); + System.out.println("Client connected: " + clientSocket.getInetAddress().getHostAddress()); + new Thread(new HandleThread(clientSocket)).start(); + } + } catch (Exception e) { + System.err.println("Server exception: " + e.getMessage()); } } } diff --git a/src/server/dao/UserDAO.java b/src/server/dao/UserDAO.java index 4a8b85e..62a856a 100644 --- a/src/server/dao/UserDAO.java +++ b/src/server/dao/UserDAO.java @@ -10,38 +10,36 @@ import server.vo.User; public class UserDAO { public static User get(String userName) throws Exception { - User user = null; - Connection con = DBConnection.getConnection(); - String sql = "select * from user where userName=?"; - PreparedStatement pst = con.prepareStatement(sql); - pst.setString(1, userName); - ResultSet rs = pst.executeQuery(); - while (rs.next()) { - user = new User(); - user.setUserName(rs.getString("userName")); - user.setPassword(rs.getString("password")); - user.setName(rs.getString("name")); - user.setRole(rs.getString("role")); + String sql = "SELECT * FROM user WHERE userName=?"; + try (Connection con = DBConnection.getConnection(); + PreparedStatement pst = con.prepareStatement(sql)) { + pst.setString(1, userName); + try (ResultSet rs = pst.executeQuery()) { + if (rs.next()) + return createUserFromResultSet(rs); + } } - DBConnection.close(con, pst); - return user; + return null; } public static ArrayList query(User userCondition) throws Exception { - ArrayList list = new ArrayList(); - Connection con = DBConnection.getConnection(); - String sql = "*******"; - PreparedStatement pst = con.prepareStatement(sql); - ResultSet rs = pst.executeQuery(); - while (rs.next()) { - User user = new User(); - user.setUserName(rs.getString("userName")); - user.setPassword(rs.getString("password")); - user.setName(rs.getString("name")); - user.setRole(rs.getString("role")); - list.add(user); + ArrayList list = new ArrayList<>(); + String sql = "SELECT * FROM user"; // 示例SQL，实际应根据userCondition调整 + try (Connection con = DBConnection.getConnection(); + PreparedStatement pst = con.prepareStatement(sql); + ResultSet rs = pst.executeQuery()) { + while (rs.next()) + list.add(createUserFromResultSet(rs)); } - DBConnection.close(con, pst); return list; } + + private static User createUserFromResultSet(ResultSet rs) throws Exception { + User user = new User(); + user.setUserName(rs.getString("userName")); + user.setPassword(rs.getString("password")); + user.setName(rs.getString("name")); + user.setRole(rs.getString("role")); + return user; + } } diff --git a/src/server/thread/HandleThread.java b/src/server/thread/HandleThread.java index f6ff056..6782de6 100644 --- a/src/server/thread/HandleThread.java +++ b/src/server/thread/HandleThread.java @@ -1,9 +1,7 @@ package server.thread; import java.io.BufferedReader; -import java.io.InputStream; import java.io.InputStreamReader; -import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.Socket; @@ -11,98 +9,81 @@ import java.util.HashMap; import java.util.Map; import com.google.gson.Gson; -import com.google.gson.JsonElement; import com.google.gson.JsonObject; -import com.google.gson.JsonParser; import server.dao.UserDAO; import server.vo.User; public class HandleThread extends Thread { private Socket socket; - private BufferedReader buf; - private PrintWriter write; public HandleThread(Socket socket) { - super(); this.socket = socket; - try { - InputStream is = socket.getInputStream(); - buf = new BufferedReader(new InputStreamReader(is, "utf-8")); - OutputStream os = socket.getOutputStream(); - write = new PrintWriter(new OutputStreamWriter(os, "utf-8")); - } catch (Exception e) { - e.printStackTrace(); - } } @Override public void run() { - while (true) { - try { - String receiveStr = buf.readLine(); + try (BufferedReader buf = new BufferedReader(new InputStreamReader(socket.getInputStream(), "utf-8")); + PrintWriter write = new PrintWriter(new OutputStreamWriter(socket.getOutputStream(), "utf-8"))) { + String receiveStr; + while ((receiveStr = buf.readLine()) != null) { System.out.println("Receive the client's request data: " + receiveStr); - JsonElement element = JsonParser.parseString(receiveStr); - JsonObject obj = element.getAsJsonObject(); + JsonObject obj = new Gson().fromJson(receiveStr, JsonObject.class); int code = obj.get("code").getAsInt(); - if (code == 8) { - close(); + if (code == 8) break; - } String data = obj.get("data").getAsString(); - String response = ""; - switch (code) { - case 0: - response = loginHandle(data); - break; - case 1: - break; - case 2: - break; - default: - System.out.println("Invalid command!"); - break; - } + String response = handleRequest(code, data); write.println(response); write.flush(); - } catch (Exception e) { - e.printStackTrace(); } + } catch (Exception e) { + e.printStackTrace(); + } finally { + System.out.println("Client exited!"); + closeResources(); } - System.out.println("Client exited!"); } - public void close() throws Exception { - if (write != null) - write.close(); - if (buf != null) - buf.close(); - if (socket != null) - socket.close(); + private String handleRequest(int code, String data) throws Exception { + switch (code) { + case 0: + return loginHandle(data); + case 1: + // Handle other cases + return ""; + case 2: + // Handle other cases + return ""; + default: + System.out.println("Invalid command!"); + return ""; + } } - public String loginHandle(String str) throws Exception { + private String loginHandle(String str) throws Exception { User loginUser = new Gson().fromJson(str, User.class); User user = UserDAO.get(loginUser.getUserName()); - String responseData = ""; + Map map = new HashMap<>(); if (user == null) { - Map map = new HashMap<>(); map.put("code", 0); map.put("data", "Username does not exist!"); - responseData = new Gson().toJson(map); + } else if (loginUser.getPassword().equals(user.getPassword())) { + map.put("code", 1); + map.put("data", new Gson().toJson(user)); } else { - if (loginUser.getPassword().equals(user.getPassword())) { - Map map = new HashMap<>(); - map.put("code", 1); - map.put("data", new Gson().toJson(user)); - responseData = new Gson().toJson(map); - } else { - Map map = new HashMap<>(); - map.put("code", 0); - map.put("data", "Wrong password!"); - responseData = new Gson().toJson(map); - } + map.put("code", 0); + map.put("data", "Wrong password!"); } - return responseData; + return new Gson().toJson(map); } -} + + private void closeResources() { + try { + if (socket != null) + socket.close(); + } catch (Exception e) { + e.printStackTrace(); + } + } +} \ No newline at end of file diff --git a/src/server/tools/DBConnection.java b/src/server/tools/DBConnection.java index 4daf327..6a4a9cf 100644 --- a/src/server/tools/DBConnection.java +++ b/src/server/tools/DBConnection.java @@ -2,7 +2,6 @@ package server.tools; import java.sql.Connection; import java.sql.DriverManager; -import java.sql.PreparedStatement; import java.sql.SQLException; public class DBConnection { @@ -10,32 +9,32 @@ public class DBConnection { private final static String url = "jdbc:mysql://localhost:3306/lda?allowPublicKeyRetrieval=true&useSSL=false"; private final static String user = "root"; private final static String password = "516849"; + static { try { Class.forName(driverName); - } catch (Exception e) { - e.printStackTrace(); + } catch (ClassNotFoundException e) { + throw new ExceptionInInitializerError(e); } } public static Connection getConnection() { - Connection connection = null; try { - connection = DriverManager.getConnection(url, user, password); + return DriverManager.getConnection(url, user, password); } catch (SQLException e) { - e.printStackTrace(); + throw new RuntimeException("Failed to get database connection", e); } - return connection; } - public static void close(Connection con, PreparedStatement pst) { - try { - if (pst != null) - pst.close(); - if (con != null) - con.close(); - } catch (SQLException e) { - e.printStackTrace(); + public static void close(AutoCloseable... resources) { + for (AutoCloseable resource : resources) { + if (resource != null) { + try { + resource.close(); + } catch (Exception e) { + e.printStackTrace(); + } + } } } } diff --git a/src/server/tools/ExportToCSV.java b/src/server/tools/ExportToCSV.java index 62c38f4..704478f 100644 --- a/src/server/tools/ExportToCSV.java +++ b/src/server/tools/ExportToCSV.java @@ -8,29 +8,36 @@ import java.sql.SQLException; import java.sql.Statement; public class ExportToCSV { - public static void to() { - String outputFile = "Library Data.csv"; + public static void to(String outputFile, String query) { try (Connection connection = DBConnection.getConnection(); Statement statement = connection.createStatement(); - ResultSet resultSet = statement.executeQuery("SELECT * FROM book"); + ResultSet resultSet = statement.executeQuery(query); FileWriter fileWriter = new FileWriter(outputFile)) { - for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) { - fileWriter.append(resultSet.getMetaData().getColumnName(i)); - if (i < resultSet.getMetaData().getColumnCount()) - fileWriter.append(","); - } - fileWriter.append("\n"); - while (resultSet.next()) { - for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) { - fileWriter.append(resultSet.getString(i)); - if (i < resultSet.getMetaData().getColumnCount()) - fileWriter.append(","); - } - fileWriter.append("\n"); - } - System.out.println("Data exported successfully!"); + writeColumnNames(resultSet, fileWriter); + writeDataRows(resultSet, fileWriter); + System.out.println("Data exported successfully to " + outputFile); } catch (SQLException | IOException e) { e.printStackTrace(); } } -} + + private static void writeColumnNames(ResultSet resultSet, FileWriter fileWriter) throws SQLException, IOException { + for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) { + fileWriter.append(resultSet.getMetaData().getColumnName(i)); + if (i < resultSet.getMetaData().getColumnCount()) + fileWriter.append(","); + } + fileWriter.append("\n"); + } + + private static void writeDataRows(ResultSet resultSet, FileWriter fileWriter) throws SQLException, IOException { + while (resultSet.next()) { + for (int i = 1; i <= resultSet.getMetaData().getColumnCount(); i++) { + fileWriter.append(resultSet.getString(i)); + if (i < resultSet.getMetaData().getColumnCount()) + fileWriter.append(","); + } + fileWriter.append("\n"); + } + } +} \ No newline at end of file diff --git a/src/server/tools/ExportToXLS.java b/src/server/tools/ExportToXLS.java index 0b2a065..e3de09e 100644 --- a/src/server/tools/ExportToXLS.java +++ b/src/server/tools/ExportToXLS.java @@ -11,37 +11,38 @@ import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; public class ExportToXLS { - public static void to() { + public static void to(String query, String outputPath) { + String[] columnHeaders = { "title", "author", "publisher", "oldprice", "newprice", "href" }; try (Connection connection = DBConnection.getConnection(); Statement statement = connection.createStatement(); - ResultSet rs = statement.executeQuery("SELECT * FROM book");) { - WritableWorkbook book = Workbook.createWorkbook(new File("Library Data.xls")); - WritableSheet sheet = book.createSheet("sheet1", 0); - Label label = new Label(0, 0, "title"); - sheet.addCell(label); - label = new Label(1, 0, "author"); - sheet.addCell(label); - label = new Label(2, 0, "publisher"); - sheet.addCell(label); - label = new Label(3, 0, "oldprice"); - sheet.addCell(label); - label = new Label(4, 0, "newprice"); - sheet.addCell(label); - label = new Label(5, 0, "href"); - sheet.addCell(label); - int i = 1; - while (rs.next()) { - for (int j = 0; j <= 5; j++) { - label = new Label(j, i, rs.getString(j + 1)); - sheet.addCell(label); - } - i++; - } - book.write(); - book.close(); - System.out.println("Data exported successfully!"); + ResultSet rs = statement.executeQuery(query)) { + WritableWorkbook workbook = Workbook.createWorkbook(new File(outputPath)); + WritableSheet sheet = workbook.createSheet("Sheet1", 0); + createColumnHeaders(sheet, columnHeaders); + writeDataRows(sheet, rs); + workbook.write(); + workbook.close(); + System.out.println("Data exported successfully to " + outputPath); } catch (Exception e) { e.printStackTrace(); } } + + private static void createColumnHeaders(WritableSheet sheet, String[] columnHeaders) throws Exception { + for (int i = 0; i < columnHeaders.length; i++) { + Label label = new Label(i, 0, columnHeaders[i]); + sheet.addCell(label); + } + } + + private static void writeDataRows(WritableSheet sheet, ResultSet rs) throws Exception { + int rowIndex = 1; + while (rs.next()) { + for (int columnIndex = 0; columnIndex <= 5; columnIndex++) { + Label label = new Label(columnIndex, rowIndex, rs.getString(columnIndex + 1)); + sheet.addCell(label); + } + rowIndex++; + } + } } diff --git a/src/server/tools/crawling/Book.java b/src/server/tools/crawling/Book.java index 73208bd..30db740 100644 --- a/src/server/tools/crawling/Book.java +++ b/src/server/tools/crawling/Book.java @@ -69,6 +69,7 @@ public class Book { } public String toString() { - return "Title: " + this.title + ", Author: " + this.author + ", Publisher: " + this.publisher + ", Original Price: " + this.oldprice + ", Discounted Price: " + this.newprice + ", URL: " + this.href; + return "Title: " + this.title + ", Author: " + this.author + ", Publisher: " + this.publisher + + ", Original Price: " + this.oldprice + ", Discounted Price: " + this.newprice + ", URL: " + this.href; } } diff --git a/src/server/tools/crawling/CrawlerTools.java b/src/server/tools/crawling/CrawlerTools.java index f815501..f08c29e 100644 --- a/src/server/tools/crawling/CrawlerTools.java +++ b/src/server/tools/crawling/CrawlerTools.java @@ -2,9 +2,7 @@ package server.tools.crawling; 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.net.URL; import java.net.URLEncoder; @@ -12,43 +10,22 @@ import java.util.regex.Matcher; import java.util.regex.Pattern; public class CrawlerTools { - public static String get(String urlStr, String charset) { - StringBuffer buf = new StringBuffer(); - HttpURLConnection con = null; - InputStream in = null; - BufferedReader read = null; - try { - URL url = new URL(urlStr); - con = (HttpURLConnection) url.openConnection(); - con.setRequestProperty("User-Agent", - "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53"); - int code = con.getResponseCode(); - if (code == 200) { - in = con.getInputStream(); - read = new BufferedReader(new InputStreamReader(in, charset)); - String info = ""; + public static String get(String urlStr, String charset) throws IOException { + StringBuilder buf = new StringBuilder(); + URL url = new URL(urlStr); + HttpURLConnection con = (HttpURLConnection) url.openConnection(); + con.setRequestProperty("User-Agent", + "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.53"); + if (con.getResponseCode() == 200) { + try (BufferedReader read = new BufferedReader(new InputStreamReader(con.getInputStream(), charset))) { + String info; while ((info = read.readLine()) != null) buf.append(info); - } else - System.out.println("Error! Response code: " + code + "."); - } catch (Exception e) { - e.printStackTrace(); - } finally { - if (read != null) - try { - read.close(); - } catch (IOException e) { - e.printStackTrace(); - } - if (in != null) - try { - in.close(); - } catch (IOException e) { - e.printStackTrace(); - } - if (con != null) - con.disconnect(); + } + } else { + System.out.println("Error! Response code: " + con.getResponseCode() + "."); } + con.disconnect(); return buf.toString(); } @@ -58,15 +35,12 @@ public class CrawlerTools { Matcher mat = pat.matcher(url); while (mat.find()) { String hanzi = mat.group(); - System.out.println(hanzi); - String encodehanzi = ""; try { - encodehanzi = URLEncoder.encode(hanzi, "utf-8"); - } catch (UnsupportedEncodingException e) { + url = url.replace(hanzi, URLEncoder.encode(hanzi, "utf-8")); + } catch (IOException e) { e.printStackTrace(); } - url = url.replaceAll(hanzi, encodehanzi); } return url; } -} +} \ No newline at end of file diff --git a/src/server/tools/crawling/Driver.java b/src/server/tools/crawling/Driver.java index 789f992..f03d7d7 100644 --- a/src/server/tools/crawling/Driver.java +++ b/src/server/tools/crawling/Driver.java @@ -1,19 +1,32 @@ package server.tools.crawling; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.TimeUnit; + public class Driver { + private static final String URL_PREFIX = "http://bang.dangdang.com/books/bestsellers/01.00.00.00.00.00-24hours-0-0-1-"; + public static void crawl() { + ExecutorService executor = Executors.newFixedThreadPool(5); try { - String url = "http://bang.dangdang.com/books/bestsellers/01.00.00.00.00.00-24hours-0-0-1-1"; - Thread thread1 = new Thread(new NewsThread(url)); - thread1.start(); - for (int i = 2; i <= 5; i++) { - String url2 = "http://bang.dangdang.com/books/bestsellers/01.00.00.00.00.00-24hours-0-0-1-" + i; - Thread thread2 = new Thread(new NewsThread(url2)); - thread2.start(); - Thread.sleep(10000); + for (int i = 1; i <= 5; i++) { + String url = URL_PREFIX + i; + executor.submit(new NewsThread(url)); + if (i > 1) + TimeUnit.SECONDS.sleep(10); + } + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + System.err.println("Thread was interrupted, Failed to complete operation"); + } finally { + executor.shutdown(); + try { + if (!executor.awaitTermination(800, TimeUnit.MILLISECONDS)) + executor.shutdownNow(); + } catch (InterruptedException e) { + executor.shutdownNow(); } - } catch (Exception e) { - e.printStackTrace(); } } } diff --git a/src/server/tools/crawling/NewsThread.java b/src/server/tools/crawling/NewsThread.java index 2ae7549..9204a05 100644 --- a/src/server/tools/crawling/NewsThread.java +++ b/src/server/tools/crawling/NewsThread.java @@ -1,7 +1,9 @@ package server.tools.crawling; +import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; +import java.sql.SQLException; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; @@ -14,63 +16,50 @@ public class NewsThread implements Runnable { private String urlPath; public NewsThread(String urlPath) { - super(); this.urlPath = urlPath; } @Override public void run() { - String content = CrawlerTools.get(urlPath, "GB2312"); - Document doc = Jsoup.parse(content); - Elements elements = doc.select(".bang_wrapper .bang_list_box ul li"); - Connection con = DBConnection.getConnection(); - PreparedStatement ps = null; - String sql = null; - int index = 0; - for (Element bookelement : elements) { - index++; - if (index >= 20) - break; - String title = bookelement.select(".name a").text(); - Elements publisherInfoElements = bookelement.select(".publisher_info"); - String author = null; - String publisher = null; - if (!publisherInfoElements.isEmpty()) { - Element firstPublisherInfoElement = publisherInfoElements.get(0); - Element secondPublisherInfoElement = publisherInfoElements.get(1); - author = firstPublisherInfoElement.select("a").text(); - publisher = secondPublisherInfoElement.select("a").text(); - } - String oprice = bookelement.select(".price_r").text(); - String nprice = bookelement.select(".price_n").first().text(); - String href = bookelement.select(".name a").attr("href"); - double oldprice = Double.parseDouble(oprice.substring(1)); - double newprice = Double.parseDouble(nprice.substring(1)); - sql = "insert into book values(?,?,?,?,?,?)"; - try { - ps = con.prepareStatement(sql); - ps.setString(1, title); - ps.setString(2, author); - ps.setString(3, publisher); - ps.setDouble(4, oldprice); - ps.setDouble(5, newprice); - ps.setString(6, href); - ps.executeUpdate(); - } catch (Exception e) { + try { + String content = CrawlerTools.get(urlPath, "GB2312"); + Document doc = Jsoup.parse(content); + Elements elements = doc.select(".bang_wrapper .bang_list_box ul li"); + try (Connection con = DBConnection.getConnection()) { + for (Element bookElement : elements.subList(0, Math.min(elements.size(), 20))) { + String title = bookElement.select(".name a").text(); + Elements publisherInfoElements = bookElement.select(".publisher_info"); + String author = publisherInfoElements.size() > 0 ? publisherInfoElements.get(0).select("a").text() + : null; + String publisher = publisherInfoElements.size() > 1 + ? publisherInfoElements.get(1).select("a").text() + : null; + String oprice = bookElement.select(".price_r").text(); + String nprice = bookElement.select(".price_n").first().text(); + String href = bookElement.select(".name a").attr("href"); + double oldprice = Double.parseDouble(oprice.substring(1)); + double newprice = Double.parseDouble(nprice.substring(1)); + insertBook(con, title, author, publisher, oldprice, newprice, href); + } + } catch (SQLException e) { e.printStackTrace(); } - System.out.println(title); - System.out.println(author); - System.out.println(publisher); - System.out.println(oldprice); - System.out.println(newprice); - System.out.println(href); - } - try { - ps.close(); - con.close(); - } catch (Exception e) { + } catch (IOException e) { e.printStackTrace(); } } + + private void insertBook(Connection con, String title, String author, String publisher, double oldprice, + double newprice, String href) throws SQLException { + String sql = "INSERT INTO book VALUES (?, ?, ?, ?, ?, ?)"; + try (PreparedStatement ps = con.prepareStatement(sql)) { + ps.setString(1, title); + ps.setString(2, author); + ps.setString(3, publisher); + ps.setDouble(4, oldprice); + ps.setDouble(5, newprice); + ps.setString(6, href); + ps.executeUpdate(); + } + } } diff --git a/src/server/vo/User.java b/src/server/vo/User.java index 734363e..6aca3c3 100644 --- a/src/server/vo/User.java +++ b/src/server/vo/User.java @@ -45,9 +45,4 @@ public class User { public void setRole(String role) { this.role = role; } - - @Override - public String toString() { - return userName + "\t" + password + "\t" + name + "\t" + role; - } }