好用java开源zip压缩解压类库Zip4j

Zip4j比jdk自带的zip类的好处是支持密码，操作更加简单，而且只要导入1个jar，不依赖于其他类库，所以使用非常方便：

1.最简单的方式压缩一堆文件到zip里：

try {
	// Initiate ZipFile object with the path/name of the zip file.
	// Zip file may not necessarily exist. If zip file exists, then 
	// all these files are added to the zip file. If zip file does not
	// exist, then a new zip file is created with the files mentioned
	ZipFile zipFile = new ZipFile("c:\\ZipTest\\AddFilesDeflateComp.zip");
	
	// Build the list of files to be added in the array list
	// Objects of type File have to be added to the ArrayList
	ArrayList filesToAdd = new ArrayList();
	filesToAdd.add(new File("c:\\ZipTest\\sample.txt"));
	filesToAdd.add(new File("c:\\ZipTest\\myvideo.avi"));
	filesToAdd.add(new File("c:\\ZipTest\\mysong.mp3"));
	
	// Initiate Zip Parameters which define various properties such
	// as compression method, etc. More parameters are explained in other
	// examples
	ZipParameters parameters = new ZipParameters();
	parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE); // set compression method to deflate compression
	
	// Set the compression level. This value has to be in between 0 to 9
	// Several predefined compression levels are available
	// DEFLATE_LEVEL_FASTEST - Lowest compression level but higher speed of compression
	// DEFLATE_LEVEL_FAST - Low compression level but higher speed of compression
	// DEFLATE_LEVEL_NORMAL - Optimal balance between compression level/speed
	// DEFLATE_LEVEL_MAXIMUM - High compression level with a compromise of speed
	// DEFLATE_LEVEL_ULTRA - Highest compression level but low speed
	parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL); 
	
	// Now add files to the zip file
	// Note: To add a single file, the method addFile can be used
	// Note: If the zip file already exists and if this zip file is a split file
	// then this method throws an exception as Zip Format Specification does not 
	// allow updating split zip files
	zipFile.addFiles(filesToAdd, parameters);
} catch (ZipException e) {
	e.printStackTrace();
} 

 2.在zip中添加文件夹，把文件压缩到里面：

		try {
			ZipFile zipFile = new ZipFile("c:\\ZipTest\\AddFilesDeflateComp.zip");
			
			ArrayList filesToAdd = new ArrayList();
			filesToAdd.add(new File("c:\\ZipTest\\sample.txt"));
			filesToAdd.add(new File("c:\\ZipTest\\myvideo.avi"));
			filesToAdd.add(new File("c:\\ZipTest\\mysong.mp3"));
			
			ZipParameters parameters = new ZipParameters();
			parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE); // set compression method to deflate compression
			
			parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
			
			// Sets the folder in the zip file to which these new files will be added.
			// In this example, test2 is the folder to which these files will be added.
			// Another example: if files were to be added to a directory test2/test3, then
			// below statement should be parameters.setRootFolderInZip("test2/test3/");
			parameters.setRootFolderInZip("test2/");
			
			// Now add files to the zip file
			zipFile.addFiles(filesToAdd, parameters);
		} catch (ZipException e) {
			e.printStackTrace();
		} 

 3.给压缩文件加密码：

			// Set the encryption flag to true
			// If this is set to false, then the rest of encryption properties are ignored
			parameters.setEncryptFiles(true);
			
			// Set the encryption method to AES Zip Encryption
			parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_AES);
			
			// Set AES Key strength. Key strengths available for AES encryption are:
			// AES_STRENGTH_128 - For both encryption and decryption
			// AES_STRENGTH_192 - For decryption only
			// AES_STRENGTH_256 - For both encryption and decryption
			// Key strength 192 cannot be used for encryption. But if a zip file already has a
			// file encrypted with key strength of 192, then Zip4j can decrypt this file
			parameters.setAesKeyStrength(Zip4jConstants.AES_STRENGTH_256);
			
			// Set password
			parameters.setPassword("test123!");
			
			// Now add files to the zip file
			// Note: To add a single file, the method addFile can be used
			// Note: If the zip file already exists and if this zip file is a split file
			// then this method throws an exception as Zip Format Specification does not 
			// allow updating split zip files
			zipFile.addFiles(filesToAdd, parameters);

 可以通过语句

parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_STANDARD);

设置不同的加密算法。

 

4.将文件夹以及里面所有文件/文件夹添加到zip中：

try {
			// Initiate ZipFile object with the path/name of the zip file.
			ZipFile zipFile = new ZipFile("c:\\ZipTest\\AddFolder.zip");
			
			// Folder to add
			String folderToAdd = "c:\\FolderToAdd";
			
			// Initiate Zip Parameters which define various properties such
			// as compression method, etc.
			ZipParameters parameters = new ZipParameters();
			
			// set compression method to store compression
			parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
			
			// Set the compression level
			parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
			
			// Add folder to the zip file
			zipFile.addFolder(folderToAdd, parameters);
			
		} catch (ZipException e) {
			e.printStackTrace();
		}

 

这个方法简单又实用。

 

5.将流压缩到zip中：

		InputStream is = null;
		
		try {

			ZipFile zipFile = new ZipFile("c:\\ZipTest\\AddStreamToZip.zip");
			
			ZipParameters parameters = new ZipParameters();
			parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
			
			// below two parameters have to be set for adding content to a zip file 
			// directly from a stream
			
			// this would be the name of the file for this entry in the zip file
			parameters.setFileNameInZip("yourfilename.txt");
			
			// we set this flag to true. If this flag is true, Zip4j identifies that
			// the data will not be from a file but directly from a stream
			parameters.setSourceExternalStream(true);
			
			// For this example I use a FileInputStream but in practise this can be 
			// any inputstream
			is = new FileInputStream("filetoadd.txt");
			
			// Creates a new entry in the zip file and adds the content to the zip file
			zipFile.addStream(is, parameters);
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

 

6.压缩成多个分卷：

		try{
		ZipFile zipFile = new ZipFile("./iam.zip");
		
		ZipParameters parameters = new ZipParameters();
		
		zipFile.createZipFile(new File("Alec Finn - The Water Is Wide.mp3"), parameters,true, 65537);
		
		}catch (Exception e) {
			e.printStackTrace();
		}

 

 7.从文件创建压缩分卷：

		try {
			// Initiate ZipFile object with the path/name of the zip file.
			ZipFile zipFile = new ZipFile("c:\\ZipTest\\CreateSplitZipFileFromFolder.zip");
			
			// Initiate Zip Parameters which define various properties such
			// as compression method, etc.
			ZipParameters parameters = new ZipParameters();
			
			// set compression method to store compression
			parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
			
			// Set the compression level. This value has to be in between 0 to 9
			parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
			
			// Create a split file by setting splitArchive parameter to true
			// and specifying the splitLength. SplitLenth has to be greater than
			// 65536 bytes
			// Please note: If the zip file already exists, then this method throws an 
			// exception
			zipFile.createZipFileFromFolder("C:\\ZipTest", parameters, true, 10485760);
		} catch (ZipException e) {
			e.printStackTrace();
		}

 8.从输出流创建zip文件：

		ZipOutputStream outputStream = null;
		InputStream inputStream = null;
		
		try {
			// Prepare the files to be added
			ArrayList filesToAdd = new ArrayList();
			filesToAdd.add(new File("c:\\ZipTest\\sample.txt"));
			filesToAdd.add(new File("c:\\ZipTest\\myvideo.avi"));
			filesToAdd.add(new File("c:\\ZipTest\\mysong.mp3"));
			
			//Initiate output stream with the path/file of the zip file
			//Please note that ZipOutputStream will overwrite zip file if it already exists 
			outputStream = new ZipOutputStream(new FileOutputStream(new File("c:\\ZipTest\\CreateZipFileWithOutputStreams.zip")));
			
			// Initiate Zip Parameters which define various properties such
			// as compression method, etc. More parameters are explained in other
			// examples
			ZipParameters parameters = new ZipParameters();
			
			//Deflate compression or store(no compression) can be set below
			parameters.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
			
			// Set the compression level. This value has to be in between 0 to 9
			// Several predefined compression levels are available
			// DEFLATE_LEVEL_FASTEST - Lowest compression level but higher speed of compression
			// DEFLATE_LEVEL_FAST - Low compression level but higher speed of compression
			// DEFLATE_LEVEL_NORMAL - Optimal balance between compression level/speed
			// DEFLATE_LEVEL_MAXIMUM - High compression level with a compromise of speed
			// DEFLATE_LEVEL_ULTRA - Highest compression level but low speed
			parameters.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
			
			//This flag defines if the files have to be encrypted.
			//If this flag is set to false, setEncryptionMethod, as described below,
			//will be ignored and the files won't be encrypted
			parameters.setEncryptFiles(true);
			
			//Zip4j supports AES or Standard Zip Encryption (also called ZipCrypto)
			//If you choose to use Standard Zip Encryption, please have a look at example
			//as some additional steps need to be done while using ZipOutputStreams with
			//Standard Zip Encryption
			parameters.setEncryptionMethod(Zip4jConstants.ENC_METHOD_AES);
			
			//If AES encryption is used, this defines the key strength
			parameters.setAesKeyStrength(Zip4jConstants.AES_STRENGTH_256);
			
			//self descriptive
			parameters.setPassword("YourPassword");
			
			//Now we loop through each file and read this file with an inputstream
			//and write it to the ZipOutputStream.
			for (int i = 0; i < filesToAdd.size(); i++) {
				File file = (File)filesToAdd.get(i);
				
				//This will initiate ZipOutputStream to include the file
				//with the input parameters
				outputStream.putNextEntry(file,parameters);
				
				//If this file is a directory, then no further processing is required
				//and we close the entry (Please note that we do not close the outputstream yet)
				if (file.isDirectory()) {
					outputStream.closeEntry();
					continue;
				}
				
				//Initialize inputstream
				inputStream = new FileInputStream(file);
				byte[] readBuff = new byte[4096];
				int readLen = -1;
				
				//Read the file content and write it to the OutputStream
				while ((readLen = inputStream.read(readBuff)) != -1) {
					outputStream.write(readBuff, 0, readLen);
				}
				
				//Once the content of the file is copied, this entry to the zip file
				//needs to be closed. ZipOutputStream updates necessary header information
				//for this file in this step
				outputStream.closeEntry();
				
				inputStream.close();
			}
			
			//ZipOutputStream now writes zip header information to the zip file
			outputStream.finish();
			
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (outputStream != null) {
				try {
					outputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

 9.解压所有文件：

		try {
			// Initiate ZipFile object with the path/name of the zip file.
			ZipFile zipFile = new ZipFile("c:\\ZipTest\\ExtractAllFiles.zip");
			
			// Extracts all files to the path specified
			zipFile.extractAll("c:\\ZipTest");
			
		} catch (ZipException e) {
			e.printStackTrace();
		}

 10.解压单个文件：

try {
			// Initiate ZipFile object with the path/name of the zip file.
			ZipFile zipFile = new ZipFile("c:\\ZipTest\\ExtractSingleFile.zip");
			
			// Check to see if the zip file is password protected 
			if (zipFile.isEncrypted()) {
				// if yes, then set the password for the zip file
				zipFile.setPassword("test123!");
			}
			
			// Specify the file name which has to be extracted and the path to which
			// this file has to be extracted
			zipFile.extractFile("Ronan_Keating_-_In_This_Life.mp3", "c:\\ZipTest\\");
			
			// Note that the file name is the relative file name in the zip file.
			// For example if the zip file contains a file "mysong.mp3" in a folder 
			// "FolderToAdd", then extraction of this file can be done as below:
			zipFile.extractFile("FolderToAdd\\myvideo.avi", "c:\\ZipTest\\");
			
		} catch (ZipException e) {
			e.printStackTrace();
		}

 例子来源于Zip4j，展开附件可以看到更多实例和源码。