Java如何压缩和解压缩zip文件

本示例演示如何使用Java进行zip文件的压缩和解压缩，利用JDK自带的java.util.zip.ZipInputStream和java.util.zip.ZipOutputStream实现文件压缩和解压缩功能。

// 压缩文件示例代码
import java.io.*;
import java.util.zip.*;

public class ZipDemo {
    public static void main(String[] args) {
        String sourcePath = "source/";
        String zipPath = "example.zip";
        try {
            // 创建FileOutputStream对象
            FileOutputStream fileOutputStream = new FileOutputStream(zipPath);
            // 创建ZipOutputStream对象
            ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
            // 循环遍历文件夹中的文件
            File file = new File(sourcePath);
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++) {
                // 创建FileInputStream对象
                FileInputStream fileInputStream = new FileInputStream(files[i]);
                // 将文件读入InputStream，并添加到指定ZipEntry中
                // 设置ZipEntry的名称
                zipOutputStream.putNextEntry(new ZipEntry(files[i].getName()));
                // 写入拷贝到ZipEntry的InputStream上
                int length;
                byte[] buffer = new byte[4096];
                while ((length = fileInputStream.read(buffer)) > 0) {
                    zipOutputStream.write(buffer, 0, length);
                }
                // 关闭当前ZipEntry并扫描下一个
                zipOutputStream.closeEntry();
                // 关闭FileInputStream
                fileInputStream.close();
            }
            // 关闭ZipOutputStream
            zipOutputStream.close();
            // 关闭FileOutputStream
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

// 解压文件示例代码
import java.io.*;
import java.util.zip.*;

public class UnZipDemo {
    public static void main(String[] args) {
        String zipPath = "example.zip";
        String targetPath = "target/";
        try {
            // 创建FileInputStream对象
            FileInputStream fileInputStream = new FileInputStream(zipPath);
            // 创建ZipInputStream对象
            ZipInputStream zipInputStream = new ZipInputStream(fileInputStream);
            // 读取ZipEntry并进行解压缩
            ZipEntry zipEntry;
            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                // 创建FileOutputStream对象
                FileOutputStream fileOutputStream = new FileOutputStream(targetPath + zipEntry.getName());
                // 读取当前ZipEntry的内容并写入OutputStream
                int length;
                byte[] buffer = new byte[4096];
                while ((length = zipInputStream.read(buffer)) > 0) {
                    fileOutputStream.write(buffer, 0, length);
                }
                // 关闭当前FileOutputStream
                fileOutputStream.close();
                // 关闭当前ZipEntry并扫描下一个
                zipInputStream.closeEntry();
            }
            // 关闭ZipInputStream
            zipInputStream.close();
            // 关闭FileInputStream
            fileInputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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