十個Java自動化腳本，開發(fā)效率倍增
作者：學研君
Java 不僅是非常強大的應用開發(fā)語言，更是自動化的利器。本文分享10個能讓你事半功倍的 Java 腳本，助你一臂之力，提高工作效率。
Java 不僅是非常強大的應用開發(fā)語言，更是自動化的利器。本文分享10個能讓你事半功倍的 Java 腳本，助你一臂之力，提高工作效率。
1.文件重復查找器
存儲空間不足？重復文件可能是罪魁禍首。這里有一個 Java 腳本，用于識別和刪除那些煩人的重復文件：
import java.io.*;
import java.nio.file.*;
import java.security.*;
import java.util.*;
publicclass DuplicateFileFinder {
public static String hashFile(Path file) throws Exception {
MessageDigest md = MessageDigest.getInstance("MD5");
try (InputStream is = Files.newInputStream(file)) {
byte[] buffer = newbyte[8192];
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
md.update(buffer, 0, bytesRead);
}
}
byte[] digest = md.digest();
return Base64.getEncoder().encodeToString(digest);
}
public static void findDuplicates(String directory) throws Exception {
Map<String, List<Path>> hashes = new HashMap<>();
Files.walk(Paths.get(directory)).filter(Files::isRegularFile).forEach(path -> {
try {
String hash = hashFile(path);
hashes.computeIfAbsent(hash, k -> new ArrayList<>()).add(path);
} catch (Exception ignored) {}
});
hashes.values().stream().filter(list -> list.size() > 1).forEach(list -> {
System.out.println("Duplicate files: " + list);
});
}
}2.自動文件整理器
如果你的下載文件夾亂七八糟，這個腳本可以幫助按文件類型進行整理，將文檔、圖片等放入不同的文件夾。
import java.io.File;
import java.nio.file.*;
publicclass FileOrganizer {
public static void organizeDirectory(String directory) {
File folder = new File(directory);
for (File file : folder.listFiles()) {
if (file.isFile()) {
String extension = getExtension(file.getName());
Path targetDir = Paths.get(directory, extension.toUpperCase());
try {
Files.createDirectories(targetDir);
Files.move(file.toPath(), targetDir.resolve(file.getName()), StandardCopyOption.REPLACE_EXISTING);
} catch (Exception e) {
System.out.println("Error moving file: " + file.getName());
}
}
}
}
private static String getExtension(String filename) {
int lastIndex = filename.lastIndexOf('.');
return (lastIndex == -1) ? "Unknown" : filename.substring(lastIndex + 1);
}
}3.每日備份系統(tǒng)
安排一個 Java 腳本，每天自動備份重要文件到指定位置。設置好文件路徑，讓它自動運行！
import java.io.*;
import java.nio.file.*;
import java.text.SimpleDateFormat;
import java.util.Date;
publicclass DailyBackup {
public static void backupDirectory(String sourceDir, String backupDir) throws IOException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String today = sdf.format(new Date());
Path backupPath = Paths.get(backupDir, "backup-" + today);
Files.createDirectories(backupPath);
Files.walk(Paths.get(sourceDir)).forEach(source -> {
try {
Path destination = backupPath.resolve(Paths.get(sourceDir).relativize(source));
Files.copy(source, destination, StandardCopyOption.REPLACE_EXISTING);
} catch (IOException e) {
System.out.println("Error backing up file: " + source);
}
});
}
}4.數(shù)據(jù)庫清理
使用此腳本定期清除舊記錄或不必要的數(shù)據(jù)。設置按計劃刪除過時的條目，以保持數(shù)據(jù)庫優(yōu)化。
import java.sql.*;
public class DatabaseCleanup {
public static void cleanupDatabase(String jdbcUrl, String user, String password) {
String sql = "DELETE FROM your_table WHERE your_column < DATE_SUB(NOW(), INTERVAL 30 DAY)";
try (Connection conn = DriverManager.getConnection(jdbcUrl, user, password);
Statement stmt = conn.createStatement()) {
int rowsDeleted = stmt.executeUpdate(sql);
System.out.println("Deleted " + rowsDeleted + " old records.");
} catch (SQLException e) {
System.out.println("Database cleanup failed.");
}
}
}5.郵件自動化
如果需要定期發(fā)送報告，這個 Java 腳本與 SMTP 服務器集成，實現(xiàn)電子郵件的自動發(fā)送，節(jié)省時間。
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;
publicclass EmailAutomation {
public static void sendEmail(String recipient, String subject, String body) {
String senderEmail = "your-email@example.com";
String senderPassword = "your-password";
Properties properties = new Properties();
properties.put("mail.smtp.auth", "true");
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", "smtp.example.com");
properties.put("mail.smtp.port", "587");
Session session = Session.getInstance(properties, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
returnnew PasswordAuthentication(senderEmail, senderPassword);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(senderEmail));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(recipient));
message.setSubject(subject);
message.setText(body);
Transport.send(message);
System.out.println("Email sent successfully");
} catch (MessagingException e) {
System.out.println("Failed to send email");
}
}
}6.網(wǎng)站狀態(tài)檢查器
若需要監(jiān)控網(wǎng)站的正常運行時間，這個腳本可以實現(xiàn)定期向你的網(wǎng)站發(fā)送請求，并在網(wǎng)站宕機時通知到你。
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
publicclass WebsiteChecker {
public static void checkWebsite(String siteUrl) {
try {
URL url = new URL(siteUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == 200) {
System.out.println(siteUrl + " is up and running!");
} else {
System.out.println(siteUrl + " is down. Response code: " + responseCode);
}
} catch (IOException e) {
System.out.println("Could not connect to " + siteUrl);
}
}
}7.天氣查詢器
集成天氣 API，在終端獲取每日天氣預報?？梢愿鶕?jù)位置定制特定更新。
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;
publicclass WeatherRetriever {
public static void getWeather(String apiUrl) {
try {
URL url = new URL(apiUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
InputStream responseStream = connection.getInputStream();
Scanner scanner = new Scanner(responseStream);
StringBuilder response = new StringBuilder();
while (scanner.hasNext()) {
response.append(scanner.nextLine());
}
System.out.println(response.toString());
scanner.close();
} catch (IOException e) {
System.out.println("Failed to retrieve weather data.");
}
}
}8.自動密碼生成器
使用此腳本生成安全、隨機的密碼。你可以指定長度、復雜性，甚至批量輸出密碼列表。
import java.security.SecureRandom;
publicclass PasswordGenerator {
privatestaticfinal String CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%&*";
public static String generatePassword(int length) {
SecureRandom random = new SecureRandom();
StringBuilder password = new StringBuilder(length);
for (int i = 0; i < length; i++) {
int index = random.nextInt(CHARACTERS.length());
password.append(CHARACTERS.charAt(index));
}
return password.toString();
}
}9.PDF 文件合并器
處理 PDF 文檔時，這個 Java 腳本將多個 PDF 文件合并為一個，使文件管理更簡單。
import java.io.*;
import java.util.*;
import org.apache.pdfbox.multipdf.PDFMergerUtility;
publicclass PDFMerger {
public static void mergePDFs(List<String> pdfPaths, String outputFilePath) throws IOException {
PDFMergerUtility merger = new PDFMergerUtility();
for (String pdfPath : pdfPaths) {
merger.addSource(pdfPath);
}
merger.setDestinationFileName(outputFilePath);
merger.mergeDocuments(null);
System.out.println("PDFs merged into: " + outputFilePath);
}
}10.屏幕截圖捕獲器
程序化地捕獲屏幕截圖。使用它來創(chuàng)建屏幕快照或自動化需要視覺文檔的工作流程。
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
publicclass ScreenCapture {
public static void takeScreenshot(String savePath) {
try {
Robot robot = new Robot();
Rectangle screenRect = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
BufferedImage screenShot = robot.createScreenCapture(screenRect);
ImageIO.write(screenShot, "png", new File(savePath));
System.out.println("Screenshot saved to " + savePath);
} catch (Exception e) {
System.out.println("Failed to take screenshot.");
}
}
}責任編輯：武曉燕
來源：
Java學研大本營
