Java 小例子：读取和解压 zip 压缩包

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
 
/**
 * ZIP 压缩包读取和解压示例
 *
 * @author yiding.he
 */
public class ZipFileDemo {
 
    public static void main(String[] args) throws IOException {
        ZipFile zip = new ZipFile("junit.jar");
        Enumeration<? extends ZipEntry> entries = zip.entries();
 
        // 遍历压缩包
        while (entries.hasMoreElements()) {
            ZipEntry entry = entries.nextElement();
 
            if (!entry.isDirectory()) {
                // 输出被压缩的文件信息
                System.out.print(entry.getName() +
                        "   (compressed from " + entry.getSize() +
                        " to " + entry.getCompressedSize() + ")...");
 
                // 解压缩文件
                InputStream is = zip.getInputStream(entry);
                FileOutputStream fos = new FileOutputStream(getFile("junit", entry.getName()));
                copyStream(is, fos);
                System.out.println("decompressed.");
            }
        }
    }
 
    private static File getFile(String root, String path) {
        File file = new File(root + "/" + path);
        if (!file.exists()) {
            file.getParentFile().mkdirs();
        }
        return file;
    }
 
    private static void copyStream(InputStream is, OutputStream os) {
        try {
            byte[] buffer = new byte[10240];
            int size = 0;
 
            while ((size = is.read(buffer)) != -1) {
                os.write(buffer, 0, size);
            }
 
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException ex) {
                // nothing to do
            }
            try {
                os.close();
            } catch (IOException ex) {
                // nothing to do
            }
        }
 
    }
}