压缩文件工具类

男娘i 2023-06-20 12:56 10阅读 0赞

public class ZipUtils {
    
    	private static final int BUFFER_SIZE = 2 * 1024;
    
    	private static Logger logger = LoggerFactory.getLogger(ZipUtils.class);
    
    	/**
    	 * 压缩成ZIP
    	 *
    	 * @param srcDir
    	 *            压缩文件夹路径
    	 * @param out
    	 *            压缩文件输出流
    	 * @param KeepDirStructure
    	 *            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)
    	 * @throws RuntimeException
    	 *             压缩失败会抛出运行时异常
    	 */
    	public static void toZip(String srcDir, OutputStream out,
    			boolean KeepDirStructure) throws RuntimeException {
    		long start = System.currentTimeMillis();
    		ZipOutputStream zos = null;
    		try {
    			zos = new ZipOutputStream(out);
    			File sourceFile = new File(srcDir);
    			compress(sourceFile, zos, sourceFile.getName(), KeepDirStructure);
    			long end = System.currentTimeMillis();
    			System.out.println("压缩完成，耗时：" + (end - start) + " ms");
    		} catch (Exception e) {
    			throw new RuntimeException("zip error from ZipUtils", e);
    		} finally {
    			if (zos != null) {
    				try {
    					zos.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    
    	/**
    	 * 压缩成ZIP
    	 *
    	 * @param srcFiles
    	 *            需要压缩的文件列表
    	 * @param out
    	 *            压缩文件输出流
    	 * @throws RuntimeException
    	 *             压缩失败会抛出运行时异常
    	 */
    	public static void toZip(List<File> srcFiles, OutputStream out)
    			throws IOException {
    
    		long start = System.currentTimeMillis();
    
    		ZipOutputStream zos = null;
    
    		try {
    
    			zos = new ZipOutputStream(out);
    
    			for (File srcFile : srcFiles) {
    
    				byte[] buf = new byte[BUFFER_SIZE];
    
    				zos.putNextEntry(new ZipEntry(srcFile.getName()));
    
    				int len;
    
    				FileInputStream in = new FileInputStream(srcFile);
    
    				while ((len = in.read(buf)) != -1) {
    
    					zos.write(buf, 0, len);
    				}
    
    				zos.closeEntry();
    
    				in.close();
    			}
    
    			long end = System.currentTimeMillis();
    
    			logger.debug("Zip compress took：[{}] ms", (end - start));
    		} finally {
    			if (zos != null) {
    				try {
    					zos.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    	}
    
    	/**
    	 * 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
    	 * @param KeepDirStructure
    	 *            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)
    	 * @throws Exception
    	 */
    	private static void compress(File sourceFile, ZipOutputStream zos,
    			String name, boolean KeepDirStructure) throws Exception {
    		byte[] buf = new byte[BUFFER_SIZE];
    		if (sourceFile.isFile()) {
    			// 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
    			zos.putNextEntry(new ZipEntry(name));
    			// copy文件到zip输出流中
    			int len;
    			FileInputStream in = new FileInputStream(sourceFile);
    			while ((len = in.read(buf)) != -1) {
    				zos.write(buf, 0, len);
    			}
    			// Complete the entry
    			zos.closeEntry();
    			in.close();
    		} else {
    			File[] listFiles = sourceFile.listFiles();
    			if (listFiles == null || listFiles.length == 0) {
    				// 需要保留原来的文件结构时,需要对空文件夹进行处理
    				if (KeepDirStructure) {
    					// 空文件夹的处理
    					zos.putNextEntry(new ZipEntry(name + "/"));
    					// 没有文件，不需要文件的copy
    					zos.closeEntry();
    				}
    			} else {
    				for (File file : listFiles) {
    					// 判断是否需要保留原来的文件结构
    					if (KeepDirStructure) {
    						// 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
    						// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
    						compress(file, zos, name + "/" + file.getName(),
    								KeepDirStructure);
    					} else {
    						compress(file, zos, file.getName(), KeepDirStructure);
    					}
    				}
    
    			}
    
    		}
    	}
    
    	/**
    	 * 解压zip格式的压缩文件到指定位置
    	 *
    	 * @param zipFileName
    	 *            压缩文件
    	 * @param extPlace
    	 *            解压目录
    	 * @throws Exception
    	 */
    	public static boolean unZipFiles(String zipFileName, String extPlace) {
    		System.setProperty("sun.zip.encoding",
    				System.getProperty("sun.jnu.encoding"));
    		try {
    			(new File(extPlace)).mkdirs();
    			File f = new File(zipFileName);
    			ZipFile zipFile = new ZipFile(zipFileName, "GBK"); // 处理中文文件名乱码的问题
    			if ((!f.exists()) && (f.length() <= 0)) {
    				throw new Exception("要解压的文件不存在!");
    			}
    			String strPath, gbkPath, strtemp;
    			File tempFile = new File(extPlace);
    			strPath = tempFile.getAbsolutePath();
    			Enumeration<?> e = zipFile.getEntries();
    			while (e.hasMoreElements()) {
    				org.apache.tools.zip.ZipEntry zipEnt = (org.apache.tools.zip.ZipEntry) e
    						.nextElement();
    				gbkPath = zipEnt.getName();
    				if (zipEnt.isDirectory()) {
    					strtemp = strPath + File.separator + gbkPath;
    					File dir = new File(strtemp);
    					dir.mkdirs();
    					continue;
    				} else { // 读写文件
    					InputStream is = zipFile.getInputStream(zipEnt);
    					BufferedInputStream bis = new BufferedInputStream(is);
    					gbkPath = zipEnt.getName();
    					strtemp = strPath + File.separator + gbkPath;// 建目录
    					String strsubdir = gbkPath;
    					for (int i = 0; i < strsubdir.length(); i++) {
    						if (strsubdir.substring(i, i + 1)
    								.equalsIgnoreCase("/")) {
    							String temp = strPath + File.separator
    									+ strsubdir.substring(0, i);
    							File subdir = new File(temp);
    							if (!subdir.exists())
    								subdir.mkdir();
    						}
    					}
    					FileOutputStream fos = new FileOutputStream(strtemp);
    					BufferedOutputStream bos = new BufferedOutputStream(fos);
    					int c;
    					while ((c = bis.read()) != -1) {
    						bos.write((byte) c);
    					}
    					bos.close();
    					fos.close();
    				}
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return false;
    		}
    	}
    
    }