揭秘Apache生态圈:盘点必备的30个核心Jar包,助你轻松构建高效应用

揭秘Apache生态圈:盘点必备的30个核心Jar包,助你轻松构建高效应用

Apache生态圈是一个庞大的开源软件项目集合,它提供了丰富的Java库和框架,用于解决开发者在编程过程中遇到的各种问题。以下是Apache生态圈中30个必备的核心Jar包,它们将帮助你轻松构建高效的应用程序。

1. Apache Commons Lang

Apache Commons Lang提供了许多Java编程语言中常用但标准库中未包含的类,如StringUtils、ArrayUtils、CollectionUtils等。

import org.apache.commons.lang3.StringUtils;

public class LangExample {

public static void main(String[] args) {

String text = "Hello, World!";

System.out.println("Original: " + text);

System.out.println("Uppercase: " + StringUtils.upperCase(text));

}

}

2. Apache Commons BeanUtils

BeanUtils提供了对JavaBean进行操作的类,如属性复制、属性设置等。

import org.apache.commons.beanutils.BeanUtils;

public class BeanUtilsExample {

public static void main(String[] args) throws Exception {

Person person = new Person("John", "Doe");

Person clone = (Person) BeanUtils.cloneBean(person);

System.out.println("Original: " + person);

System.out.println("Clone: " + clone);

}

}

class Person {

private String name;

private String surname;

public Person(String name, String surname) {

this.name = name;

this.surname = surname;

}

@Override

public String toString() {

return "Person{" +

"name='" + name + '\'' +

", surname='" + surname + '\'' +

'}';

}

}

3. Apache Commons Collections

Collections提供了对Java集合框架的扩展,包括不可变集合、集合操作等。

import org.apache.commons.collections4.ListUtils;

import java.util.Arrays;

public class CollectionsExample {

public static void main(String[] args) {

List list = Arrays.asList("a", "b", "c");

List reversed = ListUtils.reverseList(list);

System.out.println("Original: " + list);

System.out.println("Reversed: " + reversed);

}

}

4. Apache Commons IO

IO提供了文件读写、文件压缩等操作的工具类。

import org.apache.commons.io.FileUtils;

public class IOExample {

public static void main(String[] args) throws IOException {

File file = new File("example.txt");

FileUtils.write(file, "Hello, World!");

System.out.println("Content: " + FileUtils.readFileToString(file));

}

}

5. Apache Commons Math

Math提供了数学计算的工具类,如概率、统计等。

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;

public class MathExample {

public static void main(String[] args) {

double[] values = {1, 2, 3, 4, 5};

DescriptiveStatistics stats = new DescriptiveStatistics(values);

System.out.println("Mean: " + stats.getMean());

System.out.println("Standard Deviation: " + stats.getStandardDeviation());

}

}

6. Apache Commons Validator

Validator提供了客户端和服务器端的数据验证框架。

import org.apache.commons.validator.routines.EmailValidator;

public class ValidatorExample {

public static void main(String[] args) {

String email = "user@example.com";

boolean isValid = EmailValidator.getInstance().isValid(email);

System.out.println("Is valid email? " + isValid);

}

}

7. Apache Commons DBCP

DBCP提供了数据库连接池服务,提高数据库连接的效率。

import org.apache.commons.dbcp2.BasicDataSource;

public class DBCPExample {

public static void main(String[] args) {

BasicDataSource dataSource = new BasicDataSource();

dataSource.setUrl("jdbc:mysql://localhost:3306/mydb");

dataSource.setUsername("user");

dataSource.setPassword("password");

// 使用连接池中的连接

try (Connection connection = dataSource.getConnection()) {

// 执行数据库操作

}

}

}

8. Apache Commons Email

Email提供了对Java Mail API的封装,简化邮件发送和接收操作。

import org.apache.commons.mail.Email;

import org.apache.commons.mail.EmailException;

import org.apache.commons.mail.SimpleEmail;

public class EmailExample {

public static void main(String[] args) {

Email email = new SimpleEmail();

email.setSubject("Test Email");

email.setFrom("user@example.com");

email.setTo("recipient@example.com");

email.setMsg("This is a test email.");

try {

email.send();

System.out.println("Email sent successfully!");

} catch (EmailException e) {

System.err.println("Failed to send email: " + e.getMessage());

}

}

}

9. Apache Commons FileUpload

FileUpload提供了文件上传功能,适用于Web应用程序。

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.File;

import java.io.IOException;

import java.util.List;

public class FileUploadExample extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

if (ServletFileUpload.isMultipartContent(request)) {

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

List items = upload.parseRequest(request);

for (FileItem item : items) {

if (!item.isFormField()) {

String fileName = item.getName();

File storeFile = new File(getServletContext().getRealPath("/") + "uploads/" + fileName);

item.write(storeFile);

item.delete();

}

}

}

}

}

10. Apache Commons HTTPClient

HTTPClient提供了HTTP客户端与服务器的各种通讯操作。

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

public class HttpClientExample {

public static void main(String[] args) throws IOException {

CloseableHttpClient httpClient = HttpClients.createDefault();

HttpGet httpGet = new HttpGet("http://example.com");

CloseableHttpResponse response = httpClient.execute(httpGet);

String responseBody = EntityUtils.toString(response.getEntity());

System.out.println("Response: " + responseBody);

}

}

11. Apache Commons Lang

Lang提供了Java基本对象方法的工具类包,如StringUtils、ArrayUtils等。

import org.apache.commons.lang3.StringUtils;

public class LangExample {

public static void main(String[] args) {

String text = "Hello, World!";

System.out.println("Original: " + text);

System.out.println("Uppercase: " + StringUtils.upperCase(text));

}

}

12. Apache Commons Logging

Logging提供了Java的日志接口,支持多种日志实现。

import org.apache.logging.log4j.LogManager;

import org.apache.logging.log4j.Logger;

public class LoggingExample {

private static final Logger logger = LogManager.getLogger(LoggingExample.class);

public static void main(String[] args) {

logger.info("This is an info message.");

logger.error("This is an error message.");

}

}

13. Apache Commons Validator

Validator提供了客户端和服务器端的数据验证框架。

import org.apache.commons.validator.routines.EmailValidator;

public class ValidatorExample {

public static void main(String[] args) {

String email = "user@example.com";

boolean isValid = EmailValidator.getInstance().isValid(email);

System.out.println("Is valid email? " + isValid);

}

}

14. Apache Commons Configuration

Configuration提供了Java应用程序的配置管理类库,支持properties和xml文件。

import org.apache.commons.configuration.PropertiesConfiguration;

public class ConfigurationExample {

public static void main(String[] args) {

PropertiesConfiguration config = new PropertiesConfiguration("config.properties");

String username = config.getString("username");

String password = config.getString("password");

System.out.println("Username: " + username);

System.out.println("Password: " + password);

}

}

15. Apache Commons Compress

Compress提供了文件打包、压缩类库,支持多种压缩格式。

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;

import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;

import org.apache.commons.compress.compressors.gzip.GzipCompressorOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

public class CompressExample {

public static void main(String[] args) throws IOException {

File tarFile = new File("example.tar.gz");

TarArchiveOutputStream tarOutputStream = new TarArchiveOutputStream(new GzipCompressorOutputStream(new FileOutputStream(tarFile)));

TarArchiveEntry entry = new TarArchiveEntry("example.txt");

entry.setSize(10);

tarOutputStream.putArchiveEntry(entry);

tarOutputStream.write("Hello, World!".getBytes());

tarOutputStream.closeArchiveEntry();

tarOutputStream.close();

}

}

16. Apache Commons Pool

Pool提供了对象池管理,提高资源利用率。

import org.apache.commons.pool2.impl.GenericObjectPool;

import org.apache.commons.pool2.impl.GenericObjectPoolConfig;

public class PoolExample {

public static void main(String[] args) {

GenericObjectPoolConfig config = new GenericObjectPoolConfig();

config.setMaxTotal(5);

GenericObjectPool pool = new GenericObjectPool<>(new SomeClassFactory(), config);

SomeClass instance = pool.borrowObject();

// 使用实例

pool.returnObject(instance);

}

}

class SomeClassFactory implements PoolableObjectFactory {

public SomeClass create() throws Exception {

return new SomeClass();

}

public void destroy(SomeClass object) throws Exception {

// 销毁实例

}

public boolean validate(Object object) {

return true;

}

public void activate(Object object) throws Exception {

// 激活实例

}

public void passivate(Object object) throws Exception {

// 使实例处于待用状态

}

}

17. Apache Commons DBUtils

DBUtils提供了对JDBC的操作封装,简化数据查询和记录读取操作。

import org.apache.commons.dbutils.QueryRunner;

import org.apache.commons.dbutils.ResultSetHandler;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.List;

public class DBUtilsExample {

public static void main(String[] args) throws SQLException {

Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "user", "password");

QueryRunner runner = new QueryRunner();

String sql = "SELECT * FROM users";

ResultSetHandler> handler = new ResultSetHandler>() {

public List handle(ResultSet rs) throws SQLException {

List users = new ArrayList<>();

while (rs.next()) {

User user = new User();

user.setId(rs.getInt("id"));

user.setName(rs.getString("name"));

users.add(user);

}

return users;

}

};

List users = runner.query(connection, sql, handler);

System.out.println("Users: " + users);

}

}

class User {

private int id;

private String name;

// Getters and setters

}

18. Apache Commons CSV

CSV提供了读写CSV格式文件的Java类库。

import org.apache.commons.csv.CSVFormat;

import org.apache.commons.csv.CSVParser;

import org.apache.commons.csv.CSVPrinter;

import org.apache.commons.csv.CSVRecord;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

public class CSVExample {

public static void main(String[] args) throws IOException {

// 读取CSV文件

CSVParser parser = new CSVParser(new FileReader("example.csv"), CSVFormat.DEFAULT);

for (CSVRecord record : parser) {

System.out.println(record.get(0) + ", " + record.get(1));

}

parser.close();

// 写入CSV文件

CSVPrinter printer = new CSVPrinter(new FileWriter("output.csv"), CSVFormat.DEFAULT);

printer.printRecord("Name", "Age");

printer.printRecord("John", "30");

printer.printRecord("Jane", "25");

printer.close();

}

}

19. Apache Commons HttpClient

HttpClient提供了HTTP客户端与服务器的各种通讯操作。

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

public class HttpClientExample {

public static void main(String[] args) throws IOException {

CloseableHttpClient httpClient = HttpClients.createDefault();

HttpGet httpGet = new HttpGet("http://example.com");

CloseableHttpResponse response = httpClient.execute(httpGet);

String responseBody = EntityUtils.toString(response.getEntity());

System.out.println("Response: " + responseBody);

}

}

20. Apache Commons IO

IO提供了文件读写、文件压缩等操作的工具类。

import org.apache.commons.io.FileUtils;

public class IOExample {

public static void main(String[] args) throws IOException {

File file = new File("example.txt");

FileUtils.write(file, "Hello, World!");

System.out.println("Content: " + FileUtils.readFileToString(file));

}

}

21. Apache Commons Math

Math提供了数学计算的工具类,如概率、统计等。

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;

public class MathExample {

public static void main(String[] args) {

double[] values = {1, 2, 3, 4, 5};

DescriptiveStatistics stats = new DescriptiveStatistics(values);

System.out.println("Mean: " + stats.getMean());

System.out.println("Standard Deviation: " + stats.getStandardDeviation());

}

}

22. Apache Commons Validator

Validator提供了客户端和服务器端的数据验证框架。

import org.apache.commons.validator.routines.EmailValidator;

public class ValidatorExample {

public static void main(String[] args) {

String email = "user@example.com";

boolean isValid = EmailValidator.getInstance().isValid(email);

System.out.println("Is valid email? " + isValid);

}

}

23. Apache Commons DBCP

DBCP提供了数据库连接池服务,提高数据库连接的效率。

import org.apache.commons.dbcp2.BasicDataSource;

public class DBCPExample {

public static void main(String[] args) {

BasicDataSource dataSource = new BasicDataSource();

dataSource.setUrl("jdbc:mysql://localhost:3306/mydb");

dataSource.setUsername("user");

dataSource.setPassword("password");

// 使用连接池中的连接

try (Connection connection = dataSource.getConnection()) {

// 执行数据库操作

}

}

}

24. Apache Commons Email

Email提供了对Java Mail API的封装,简化邮件发送和接收操作。

import org.apache.commons.email.Email;

import org.apache.commons.email.EmailException;

import org.apache.commons.email.SimpleEmail;

public class EmailExample {

public static void main(String[] args) {

Email email = new SimpleEmail();

email.setSubject("Test Email");

email.setFrom("user@example.com");

email.setTo("recipient@example.com");

email.setMsg("This is a test email.");

try {

email.send();

System.out.println("Email sent successfully!");

} catch (EmailException e) {

System.err.println("Failed to send email: " + e.getMessage());

}

}

}

25. Apache Commons FileUpload

FileUpload提供了文件上传功能,适用于Web应用程序。

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.File;

import java.io.IOException;

import java.util.List;

public class FileUploadExample extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

if (ServletFileUpload.isMultipartContent(request)) {

DiskFileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

List items = upload.parseRequest(request);

for (FileItem item : items) {

if (!item.isFormField()) {

String fileName = item.getName();

File storeFile = new File(getServletContext().getRealPath("/") + "uploads/" + fileName);

item.write(storeFile);

item.delete();

}

}

}

}

}

26. Apache Commons HttpClient

HttpClient提供了HTTP客户端与服务器的各种通讯操作。

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

public class HttpClientExample {

public static void main(String[] args) throws IOException {

CloseableHttpClient httpClient = HttpClients.createDefault();

HttpGet httpGet = new HttpGet("http://example.com");

CloseableHttpResponse response = httpClient.execute(httpGet);

String responseBody = EntityUtils.toString(response.getEntity());

System.out.println("Response: " + responseBody);

}

}

27. Apache Commons IO

IO提供了文件读写、文件压缩等操作的工具类。

import org.apache.commons.io.FileUtils;

public class IOExample {

public static void main(String[] args) throws IOException {

File file = new File("example.txt");

FileUtils.write(file, "Hello, World!");

System.out.println("Content: " + FileUtils.readFileToString(file));

}

}

28. Apache Commons Math

Math提供了数学计算的工具类,如概率、统计等。

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;

public class MathExample {

public static void main(String[] args) {

double[] values = {1, 2, 3, 4, 5};

DescriptiveStatistics stats = new DescriptiveStatistics(values);

System.out.println("Mean: " + stats.getMean());

System.out.println("Standard Deviation: " + stats.getStandardDeviation());

}

}

29. Apache Commons Validator

Validator提供了客户端和服务器端的数据验证框架。

import org.apache.commons.validator.routines.EmailValidator;

public class ValidatorExample {

public static void main(String[] args) {

String email = "user@example.com";

boolean isValid = EmailValidator.getInstance().isValid(email);

System.out.println("Is valid email? " + isValid);

}

}

30. Apache Commons DBCP

DB

相关推荐