public class Util { private static final String TAG = "Util"; public static final int CODE_WRITEFILE = 102; /** * 按钮可用和不可用状态 * @param btn 按钮对象 * @param flag true 可用 */ public static void enabled(Button btn, boolean flag){ if(flag){ btn.setEnabled(true); btn.setAlpha(1); }else{ btn.setEnabled(false); btn.setAlpha(0.4f); } }

SM3Util.gz_SM3_SM3Util_SMSutil_国密_国密算法

private static native void update(byte[] input, int offset, int length); // 最终计算并获取哈希值 private static native byte[] digest(); // 公开API，对外提供服务 public static byte[] sm3Digest...

mdast-util-to-string:实用程序以获取mdast节点的纯文本内容

mdast-util-to-string 实用程序，用于获取节点的纯文本内容。安装该软件包：需要使用Node 12+才能使用它，并且必须将其import而不是require d。： npm install mdast-util-to-string 用 import unified from '...

package util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class Util { private static final String URL = "jdbc:mysql://localhost:3306/_library"; private static final String USERNAME = "root"; private static final String PASSWORD = "root"; public static Connection getConnection() { try { return DriverManager.getConnection(URL, USERNAME, PASSWORD); } catch (SQLException e) { System.out.println("无法建立数据库连接：" + e.getMessage()); return null; } } }

在你的代码片段中，包名是 util，类名是 Util。如果你在其他地方使用了这个类，需要确保你的引用是正确的。 3. 编译错误：你需要确保你的代码能够成功编译。如果你在编译时遇到了错误，则需要解决这些错误。 ...

package db; import java.sql.*; public class Shujuku { private static final String URL = "jdbc:mysql://localhost:3306/?db_student"; private static final String USERNAME = "root"; private static final String PASSWORD = "123456"; private static final String DRIVER_CLASS = "com.mysql.jdbc.Driver"; public void kk(){ try{ Class.forName(DRIVER_CLASS); Connection conn = DriverManager.getConnection(URL, USERNAME, PASSWORD); Statement statement=conn.createStatement(); System.out.println("已经成功连接到数据库！"); } catch (Exception e) { throw new RuntimeException(e); } }}优化

private static DataSource ds; static { try { InputStream is = DatabaseUtil.class.getClassLoader().getResourceAsStream("db.properties"); Properties props = new Properties(); props.load(is); ds =...

package com.shichuang.util; public class Constants { public final static String USER_SESSION = "userSession"; public final static String SYS_MESSAGE = "message"; public final static int pageSize = 5; }

这段代码定义了一个名为Constants的工具类，其中包含了一些常量。具体解释如下： 1. USER_SESSION：表示用户会话的常量，用于在会话中存储用户信息。...您可以根据自己的需求使用这些常量来存储和访问相关数据。

import java.util.Scanner; ////计算两个整数的和 public class Java_modi1 { public static void main(String[] args) { //*****Found Scanner sc = new Scanner(); //Found int x = ; //Found**** int y = __; int result = x*y; System.out.println(result); System.exit(0); } }

public static void main(String[] args) { Scanner sc = new Scanner(System.in); // 使用System.in作为输入源 int x = sc.nextInt(); // 读取输入的整数x int y = sc.nextInt(); // 读取输入的整数y int ...

上传/下载文件 <form method="post" action="/file/upload" enctype="multipart/form-data"> <input type="file" name="file" id="fileInput"/> <input type="submit" value="上传" /> </form>
<form method="post" action="/file/download" > <input type="text" name="fileName" placeholder="请输入文件名" /> <input type="submit" value="下载" id="downloadBtn" /> </form> public class SFTPUtil { private static final String host = "10.60.0.160"; private static final int port = 22; private static final String username = "root"; private static final String password = "Z20"; private static Session session = null; public static void connect() throws Exception { } public static void upload(MultipartFile file, String path, String fileName) throws Exception { } public static boolean download(HttpServletResponse response, String path, String fileName) throws Exception { } @Controller @RequestMapping("/file") public class FileController { private static final String UPLOAD_PATH = "/data/sftp/adtuser1/upload/winbidding/"; private static final String DOWNLOAD_PATH = "/data/sftp/adtuser1/upload/winbidding/"; @PostMapping("/upload") @ResponseBody public ModelAndView upload(@RequestParam("file") MultipartFile file) { } @PostMapping("/download") public ModelAndView download(@RequestParam("fileName") String fileName, HttpServletResponse response) throws Exception { } 数据库有host port username password UPLOAD_PATH DOWNLOAD_PATH csmc字段，把上边写死的改成数据库查询，前台页面增加csmc字段下拉框，根据csmc字段把查出来的配置数据完成上传下载功能，用的mysql数据库，把代码改好写出来

public SFTPUtil(String host, int port, String username, String password, String uploadPath, String downloadPath) { this.host = host; this.port = port; this.username = username; this.password = ...

mport java.util.Scanner; public class Gomoku { private static final int BOARD_SIZE = 15; private static final int EMPTY = 0; private static final int PLAYER = 1; private static final int COMPUTER = 2; private static final int[] DX = {0, 1, 1, 1}; private static final int[] DY = {1, 0, 1, -1}; private static int[][] board = new int[BOARD_SIZE][BOARD_SIZE]; private static boolean isGameOver = false; private static int winner = EMPTY; private static Scanner scanner = new Scanner(System.in); private static void initBoard() { for (int i = 0; i < BOARD_SIZE; i++) { for (int j = 0; j < BOARD_SIZE; j++) { board[i][j] = EMPTY; } } }

这段代码是一个五子棋游戏的Java实现，其中定义了一些常量，如棋盘大小（15x15）、空白格（EMPTY）、玩家棋子（PLAYER）、电脑...isGameOver和winner变量用于记录游戏是否结束和胜利者。Scanner对象用于获取玩家输入。

public class JCEMapper { /** {@link org.apache.commons.logging} logging facility */ private static java.util.logging.Logger log = java.util.logging.Logger.getLogger(JCEMapper.class.getName()); private static Map<String, Algorithm> algorithmsMap = new ConcurrentHashMap<String, Algorithm>(); private static String providerName = null;

其中，静态变量algorithmsMap是一个线程安全的ConcurrentHashMap，用于存储算法名称和对应的Algorithm对象。 providerName变量用于指定使用的加密服务提供者的名称，如未指定，则使用默认的提供者。该类主要提供...

根据提示，在右侧编辑器编写代码，使用PreparedStatement 接口完成查询已知数据表的记录，要求根据键盘输入的 ID 找到该记录。package step1; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.io.; public class JdbcTestFour{ public static final String DBDRIVER="com.mysql.jdbc.Driver"; public static final String DBURL="jdbc:mysql://localhost:3306/school"; public static final String DBUSER="root"; public static final String PASSWORD="123123"; public static void main(String[] args) throws Exception{ int id=0; String name=null; int age=0; String note=null; BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); String sql="SELECT id,name,age,note FROM member WHERE id=?"; Connection conn=null; //每一个Connection 对象表示一个数据库连接 PreparedStatement pstmt=null; //数据库操作对象 / begin / //加载驱动程序 //根据参数DBURL、DBUSER、PASSWORD 创建连接对象conn / end / pstmt=conn.prepareStatement(sql); //执行SQL 语句 System.out.println("请输入学号"); id=Integer.parseInt(br.readLine()); pstmt.setInt(1,id); / begin / ResultSet rs; //查询操作 / end / / begin / //显示查询数据 / end / pstmt.close(); //关闭操作，如果不关闭操作，关闭连接也是一样的 conn.close(); //关闭连接 } }package step1; import java.sql.; public class Insert { public void createDatabase() { try { // 加载数据库驱动程序 Class.forName("com.mysql.jdbc.Driver"); // 建立数据库连接 Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/", "root", "123123"); // 创建 Statement 对象 Statement stmt = conn.createStatement(); // 执行 SQL 语句创建数据库 String sql = "CREATE DATABASE school;"; stmt.executeUpdate(sql); // 关闭 Statement 对象和 Connection 对象 stmt.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } }

public static final String DBURL="jdbc:mysql://localhost:3306/school"; public static final String DBUSER="root"; public static final String PASSWORD="123123"; public static void main(String[] ...

帮我优化这段代码，谢谢package com.neutech.utils; import java.sql.*; import java.util.ArrayList; import java.util.List; public class Jdbcutil { private static final String DRIVERNAME = "org.apache.hive.jdbc.HiveDriver"; private static final String URL = "jdbc:hive2://192.168.44.199:10000/test"; private static final String USERNAME = "root"; private static final String PASSWORD = "200812"; public static Connection getConnection() throws ClassNotFoundException { Class.forName(DRIVERNAME); Connection connection = null; try { connection = DriverManager.getConnection(URL,USERNAME,PASSWORD); } catch (SQLException throwables) { throwables.printStackTrace(); } return connection; } public static <T> List<T> execuetQuery(String sql, RowMap<T> rowMap, Object... objs) throws ClassNotFoundException, SQLException { // 建立连接 Connection connection = getConnection(); PreparedStatement preparedStatement = connection.prepareStatement(sql); // 注入额外条件 if(objs != null){ for(int i = 0;i <= objs.length;i++){ preparedStatement.setObject(i + 1,objs[i]); } } ResultSet resultSet = preparedStatement.executeQuery(); ArrayList<T> list = new ArrayList<>(); while(resultSet.next()){ T t = rowMap.RowMapping(resultSet); list.add(t); } return list; } public static void close(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet) throws SQLException { connection.close(); preparedStatement.close(); resultSet.close(); } }

private static final String CONFIG_FILE = "jdbc.properties"; private static Properties properties = new Properties(); private static String driverName; private static String url; private static ...

import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexMatches { private static final String REGEX = "\\bcat\\b"; private static final String INPUT = "cat cat cat cattie cat"; public static void main( String[] args ){ Pattern p = Pattern.compile(REGEX); Matcher m = p.matcher(INPUT); // 获取 matcher 对象 int count = 0; while(m.find()) { count++; System.out.println("Match number "+count); System.out.println("start(): "+m.start()); System.out.println("end(): "+m.end()); } } }

首先，代码导入了java.util.regex包下的Matcher和Pattern类。接下来，创建了一个名为RegexMatches的类。在类中，定义了一个名为REGEX的常量，它表示要匹配的正则表达式，这里的正则表达式是"\bcat\b"，表示匹配...

import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int num1 = sc.nextInt(); int num2 = sc.nextInt(); /***** Begin / System.out.println(num1/num2); / End *****/ } }

public static void main(String[] args) { Scanner sc = new Scanner(System.in); int num1 = sc.nextInt(); int num2 = sc.nextInt(); try { /********* Begin *********/ System.out.println(num1 / num2)...

改写为连接SQl server数据库：package lemon.util; import com.mysql.cj.jdbc.MysqlDataSource; import lemon.exception.SystemException; import javax.sql.DataSource; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class DBUtil { private static final String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=book"; private static final String USERNAME = "sa"; private static final String PASSWORD = "123456"; private static volatile DataSource DATA_SOURCE; private DBUtil(){} private static DataSource getDataSource(){ if(DATA_SOURCE == null){ synchronized (DBUtil.class){ if(DATA_SOURCE == null){ DATA_SOURCE = new MysqlDataSource(); ((MysqlDataSource) DATA_SOURCE).setURL(URL); ((MysqlDataSource) DATA_SOURCE).setUser(USERNAME); ((MysqlDataSource) DATA_SOURCE).setPassword(PASSWORD); } } } return DATA_SOURCE; } public static Connection getConnection(){ try { return getDataSource().getConnection(); } catch (SQLException e) { throw new SystemException("000001", "获取数据库连接失败", e); } } public static void close(Connection c, Statement s){ close(c, s, null); } public static void close(Connection c, Statement s, ResultSet r){ try { if(r != null) r.close(); if(s != null) s.close(); if(c != null) c.close(); } catch (SQLException e) { throw new SystemException("000002", "释放数据库资源出错", e); } } }

private static final String URL = "jdbc:sqlserver://localhost:1433;databaseName=book"; private static final String USERNAME = "sa"; private static final String PASSWORD = "123456"; private static ...

import java.util.concurrent.;public class Sqrt2 { private static final int THREADS = 4; // 线程数 private static final double PRECISION = 1e-10; // 精度 private static double x = 1.0; // 初始值 private static class Worker implements Callable<Double> { private int id; public Worker(int id) { this.id = id; } public Double call() throws Exception { double delta = 1.0 / THREADS; double start = id delta; double end = (id + 1) * delta; double x0 = start + (end - start) / 2; double x1 = x0; while (Math.abs(x1 - x0) > PRECISION) { x0 = x1; double fx = x * x - 2; double fpx = 2 * x; x1 = x0 - fx / fpx; } return x1; } } public static void main(String[] args) throws Exception { ExecutorService executor = Executors.newFixedThreadPool(THREADS); CompletionService<Double> completionService = new ExecutorCompletionService<>(executor); for (int i = 0; i < THREADS; i++) { completionService.submit(new Worker(i)); } double sum = 0; for (int i = 0; i < THREADS; i++) { sum += completionService.take().get(); } double result = sum / THREADS; System.out.println("根号2的值为：" + result); executor.shutdown(); }} 为什么计算出来的根号2是0.5

private static final int THREADS = 4; // 线程数 private static final double PRECISION = 1e-10; // 精度 private static double x = 1.0; // 初始值 private static class Worker implements Callable...

package XXLChess; //import org.reflections.Reflections; //import org.reflections.scanners.Scanners; import processing.core.PApplet; import processing.core.PImage; import processing.data.JSONObject; import processing.data.JSONArray; import processing.core.PFont; import processing.event.MouseEvent; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.TimeUnit; import java.awt.Font; import java.io.; import java.util.; public class App extends PApplet { public static final int SPRITESIZE = 480; public static final int CELLSIZE = 48; public static final int SIDEBAR = 120; public static final int BOARD_WIDTH = 14; public static int WIDTH = CELLSIZEBOARD_WIDTH+SIDEBAR; public static int HEIGHT = BOARD_WIDTHCELLSIZE; public static final int FPS = 60; public String configPath; public App() { this.configPath = "config.json"; } /** * Initialise the setting of the window size. */ public void settings() { size(WIDTH, HEIGHT); } /** * Load all resources such as images. Initialise the elements such as the player, enemies and map elements. */ public void setup() { frameRate(FPS); // Load images during setup // PImage spr = loadImage("src/main/resources/XXLChess/"+...); // load config JSONObject conf = loadJSONObject(new File(this.configPath)); } /** * Receive key pressed signal from the keyboard. */ public void keyPressed(){ } /** * Receive key released signal from the keyboard. */ public void keyReleased(){ } @Override public void mouseClicked(MouseEvent e) { } @Override public void mouseDragged(MouseEvent e) { } /** * Draw all elements in the game by current frame. */ public void draw() { } // Add any additional methods or attributes you want. Please put classes in different files. public static void main(String[] args) { PApplet.main("XXLChess.App"); } }

- setup()：加载资源和配置文件等 - keyPressed()：接收键盘按下信号 - keyReleased()：接收键盘释放信号 - mouseClicked()：接收鼠标点击信号 - mouseDragged()：接收鼠标拖动信号 - draw()：绘制游戏元素最后，...

private static final String APP_ID = "wx4e9dd6b00777a990"; private static final String APP_SECRET = "bef72b5c47c5f4674375b3c86e2877e5"; private static final String TEMPLATE_ID = "_d3ZIliX-mL3pQXg3_jUdgBMZ834feovnvD_Jl-qSj4";使用配置文件，写出代码

private static final String CONFIG_FILE = "config.properties"; private static final Properties props = new Properties(); static { try (InputStream input = new FileInputStream(CONFIG_FILE)) { ...

package demo; import java.util.HashMap; import java.util.Scanner; public class exercise333 { private static Scanner scanner; /** * 学生信息集合 */ private static HashMap<String,Student> map; public static void main(String[] args) { // TODO Auto-generated method stub select(); } private static void select() { System.out.println("请输入学号："); Scanner sc = new Scanner(System.in); String nub = sc.nextLine(); Student student = map.get(nub); if(student == null) System.out.println("没有查询到该学生！"); else System.out.println(student.toString()); } } class Student{ private String sno; /** * 学号 */ private String name; /** * 姓名 */ private String major; /** * 专业 */ private String score; /** * 成绩 */ public String toString() { return "学生信息{"+ "学号='" + sno + '\'' + "姓名='" + name + '\'' + "专业='" + major + '\'' + "成绩='" + score + '\'' + '}'; } public String getSno() { return sno; } public void setSno(String sno) { this.sno = sno; } public String getName() { return name ; } public void setName(String name) { this.name = name; } public String getMajor() { return major; } public void setMajor(String major) { this.major = major; } public String getScore() { return score; } public void setScore(String score) { this.score =score; } public Student(String sno,String name,String major,String score) { this.sno = sno; this.name = name; this.major = major; this.score = score; } }

private static HashMap<String,Student> map = new HashMap<String,Student>(); 2. The toString method in the Student class is missing some plus signs to concatenate the strings. Fix it by adding...

package com.de.debook.bo; import java.util.HashMap; import java.util.Map; public class ResponseBean { private Map<String, Object> responseMap = new HashMap<>(); private static final Integer success = 0; private static final Integer error = -1; private static final String message = "ok"; // 默认应答成功 public ResponseBean() { responseMap.put("status", success); responseMap.put("message", message); } // 出错时消息 public void putError(String message) { responseMap.put("status", error); responseMap.put("message", message); } // 数据 public void putData(String key, Object value) { responseMap.put(key, value); } // 分页数据 public void putPageData(Object data, Object count){ responseMap.put("code", success); responseMap.put("data", data); responseMap.put("count", count); } public Map<String, Object> getResponseMap() { return responseMap; } }

其中包含了成功和失败的状态码、消息以及数据的相关方法。代码中使用了一个 HashMap 来存储返回的数据，可以通过 putData 方法来添加数据，也可以通过 putError 方法来添加出错时的消息。此外，还提供了一个 ...

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SM3Util.gz_SM3_SM3Util_SMSutil_国密_国密算法

mdast-util-to-string:实用程序以获取mdast节点的纯文本内容

package com.shichuang.util; public class Constants { public final static String USER_SESSION = "userSession"; public final static String SYS_MESSAGE = "message"; public final static int pageSize = 5; }

import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int num1 = sc.nextInt(); int num2 = sc.nextInt(); /********* Begin *********/ System.out.println(num1/num2); /********* End *********/ } }

private static final String APP_ID = "wx4e9dd6b00777a990"; private static final String APP_SECRET = "bef72b5c47c5f4674375b3c86e2877e5"; private static final String TEMPLATE_ID = "_d3ZIliX-mL3pQXg3_jUdgBMZ834feovnvD_Jl-qSj4";使用配置文件，写出代码

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import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int num1 = sc.nextInt(); int num2 = sc.nextInt(); /***** Begin / System.out.println(num1/num2); / End *****/ } }