Java基础-实现zip解压缩

可实现: 文件、文件夹的解压缩操作

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.Enumeration;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 文件压缩工具类
 */
public class ZipUtil {
	private static final int BUFFER_SIZE = 2 * 1024;
	/**
	 * 是否保留原来的目录结构
	 * true:  保留目录结构;
	 * false: 所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)
	 */
	private static final boolean KeepDirStructure = true;
	private static final Logger log = LoggerFactory.getLogger(ZipUtil.class);
	
	public static void main(String[] args) {
		try {
			toZip("E:/app1", "E:/app.zip",true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 压缩成ZIP
	 * @param srcDir         压缩 文件/文件夹 路径
	 * @param outPathFile    压缩 文件/文件夹 输出路径+文件名 D:/xx.zip
	 * @param isDelSrcFile   是否删除原文件: 压缩前文件
	 */
	public static void toZip(String srcDir, String outPathFile,boolean isDelSrcFile) throws Exception {
		long start = System.currentTimeMillis();
		FileOutputStream out = null; 
		ZipOutputStream zos = null;
		try {
			out = new FileOutputStream(new File(outPathFile));
			zos = new ZipOutputStream(out);
			File sourceFile = new File(srcDir);
			if(!sourceFile.exists()){
				throw new Exception("需压缩文件或者文件夹不存在");
			}
			compress(sourceFile, zos, sourceFile.getName());
			if(isDelSrcFile){
				delDir(srcDir);
			}
			log.info("原文件:{}. 压缩到:{}完成. 是否删除原文件:{}. 耗时:{}ms. ",srcDir,outPathFile,isDelSrcFile,System.currentTimeMillis()-start);
		} catch (Exception e) {
			log.error("zip error from ZipUtils: {}. ",e.getMessage());
			throw new Exception("zip error from ZipUtils");
		} finally {
			try {
				if (zos != null) {zos.close();}
				if (out != null) {out.close();}
			} catch (Exception e) {}
		}
	}

	/**
	 * 递归压缩方法
	 * @param sourceFile 源文件
	 * @param zos zip输出流
	 * @param name 压缩后的名称
	 */
	private static void compress(File sourceFile, ZipOutputStream zos, String name)
			throws Exception {
		byte[] buf = new byte[BUFFER_SIZE];
		if (sourceFile.isFile()) {
			zos.putNextEntry(new ZipEntry(name));
			int len;
			FileInputStream in = new FileInputStream(sourceFile);
			while ((len = in.read(buf)) != -1) {
				zos.write(buf, 0, len);
			}
			zos.closeEntry();
			in.close();
		} else {
			File[] listFiles = sourceFile.listFiles();
			if (listFiles == null || listFiles.length == 0) {
				if (KeepDirStructure) {
					zos.putNextEntry(new ZipEntry(name + "/"));
					zos.closeEntry();
				}
			} else {
				for (File file : listFiles) {
					if (KeepDirStructure) {
						compress(file, zos, name + "/" + file.getName());
					} else {
						compress(file, zos, file.getName());
					}
				}
			}
		}
	}
	
	/**
	 * 解压文件到指定目录
	 */
	@SuppressWarnings({ "rawtypes", "resource" })
	public static void unZipFiles(String zipPath, String descDir) throws IOException {
		log.info("文件:{}. 解压路径:{}. 解压开始.",zipPath,descDir);
		long start = System.currentTimeMillis();
		try{
			File zipFile = new File(zipPath);
			System.err.println(zipFile.getName());
			if(!zipFile.exists()){
				throw new IOException("需解压文件不存在.");
			}
			File pathFile = new File(descDir);
			if (!pathFile.exists()) {
				pathFile.mkdirs();
			}
			ZipFile zip = new ZipFile(zipFile, Charset.forName("GBK"));
			for (Enumeration entries = zip.entries(); entries.hasMoreElements();) {
				ZipEntry entry = (ZipEntry) entries.nextElement();
				String zipEntryName = entry.getName();
				System.err.println(zipEntryName);
				InputStream in = zip.getInputStream(entry);
				String outPath = (descDir + File.separator + zipEntryName).replaceAll("\\*", "/");
				System.err.println(outPath);
				// 判断路径是否存在,不存在则创建文件路径
				File file = new File(outPath.substring(0, outPath.lastIndexOf('/')));
				if (!file.exists()) {
					file.mkdirs();
				}
				// 判断文件全路径是否为文件夹,如果是上面已经上传,不需要解压
				if (new File(outPath).isDirectory()) {
					continue;
				}
				// 输出文件路径信息
				OutputStream out = new FileOutputStream(outPath);
				byte[] buf1 = new byte[1024];
				int len;
				while ((len = in.read(buf1)) > 0) {
					out.write(buf1, 0, len);
				}
				in.close();
				out.close();
			}
			log.info("文件:{}. 解压路径:{}. 解压完成. 耗时:{}ms. ",zipPath,descDir,System.currentTimeMillis()-start);
		}catch(Exception e){
			log.info("文件:{}. 解压路径:{}. 解压异常:{}. 耗时:{}ms. ",zipPath,descDir,e,System.currentTimeMillis()-start);
			throw new IOException(e);
		}
	}
	
	// 删除文件或文件夹以及文件夹下所有文件
	public static void delDir(String dirPath) throws IOException {
		log.info("删除文件开始:{}.",dirPath);
		long start = System.currentTimeMillis();
		try{
			File dirFile = new File(dirPath);
			if (!dirFile.exists()) {
				return;
			}
			if (dirFile.isFile()) {
				dirFile.delete();
				return;
			}
			File[] files = dirFile.listFiles();
			if(files==null){
				return;
			}
			for (int i = 0; i < files.length; i++) {
				delDir(files[i].toString());
			}
			dirFile.delete();
			log.info("删除文件:{}. 耗时:{}ms. ",dirPath,System.currentTimeMillis()-start);
		}catch(Exception e){
			log.info("删除文件:{}. 异常:{}. 耗时:{}ms. ",dirPath,e,System.currentTimeMillis()-start);
			throw new IOException("删除文件异常.");
		}
	}
}