Add desktop Zip4j examples from zip4j website.

Zip4jExamples/src/net/lingala/zip4j/examples/extract/ExtractAllFiles.java

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+/*
+* Copyright 2010 Srikanth Reddy Lingala  
+* 
+* Licensed under the Apache License, Version 2.0 (the "License"); 
+* you may not use this file except in compliance with the License. 
+* You may obtain a copy of the License at 
+* 
+* http://www.apache.org/licenses/LICENSE-2.0 
+* 
+* Unless required by applicable law or agreed to in writing, 
+* software distributed under the License is distributed on an "AS IS" BASIS, 
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+* See the License for the specific language governing permissions and 
+* limitations under the License. 
+*/
+
+package net.lingala.zip4j.examples.extract;
+
+import net.lingala.zip4j.core.ZipFile;
+import net.lingala.zip4j.exception.ZipException;
+
+/**
+ * Demonstrates extracting all files from a zip file
+ * 
+ * @author Srikanth Reddy Lingala
+ *
+ */
+public class ExtractAllFiles {
+
+	public ExtractAllFiles() {
+
+		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();
+		}
+
+	}
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		new ExtractAllFiles();
+	}
+
+}

Zip4jExamples/src/net/lingala/zip4j/examples/extract/ExtractAllFilesWithInputStreams.java

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+/*
+ * Copyright 2010 Srikanth Reddy Lingala  
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License. 
+ * You may obtain a copy of the License at 
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0 
+ * 
+ * Unless required by applicable law or agreed to in writing, 
+ * software distributed under the License is distributed on an "AS IS" BASIS, 
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+ * See the License for the specific language governing permissions and 
+ * limitations under the License. 
+ */
+
+package net.lingala.zip4j.examples.extract;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.List;
+
+import net.lingala.zip4j.core.ZipFile;
+import net.lingala.zip4j.exception.ZipException;
+import net.lingala.zip4j.io.ZipInputStream;
+import net.lingala.zip4j.model.FileHeader;
+import net.lingala.zip4j.unzip.UnzipUtil;
+
+/**
+ * Example demonstrating the use of InputStreams 
+ * to extract files from the ZipFile
+ */
+public class ExtractAllFilesWithInputStreams {
+
+	private final int BUFF_SIZE = 4096;
+
+	public ExtractAllFilesWithInputStreams() {
+
+		ZipInputStream is = null;
+		OutputStream os = null;
+
+		try {
+			// Initiate the ZipFile
+			ZipFile zipFile = new ZipFile("C:\\ZipTest\\ExtractAllFilesWithInputStreams.zip");
+			String destinationPath = "c:\\ZipTest";
+
+			// If zip file is password protected then set the password
+			if (zipFile.isEncrypted()) {
+				zipFile.setPassword("password");
+			}
+
+			//Get a list of FileHeader. FileHeader is the header information for all the
+			//files in the ZipFile
+			List fileHeaderList = zipFile.getFileHeaders();
+
+			// Loop through all the fileHeaders
+			for (int i = 0; i < fileHeaderList.size(); i++) {
+				FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
+				if (fileHeader != null) {
+
+					//Build the output file
+					String outFilePath = destinationPath + System.getProperty("file.separator") + fileHeader.getFileName();
+					File outFile = new File(outFilePath);
+
+					//Checks if the file is a directory
+					if (fileHeader.isDirectory()) {
+						//This functionality is up to your requirements
+						//For now I create the directory
+						outFile.mkdirs();
+						continue;
+					}
+
+					//Check if the directories(including parent directories)
+					//in the output file path exists
+					File parentDir = outFile.getParentFile();
+					if (!parentDir.exists()) {
+						parentDir.mkdirs();
+					}
+
+					//Get the InputStream from the ZipFile
+					is = zipFile.getInputStream(fileHeader);
+					//Initialize the output stream
+					os = new FileOutputStream(outFile);
+
+					int readLen = -1;
+					byte[] buff = new byte[BUFF_SIZE];
+
+					//Loop until End of File and write the contents to the output stream
+					while ((readLen = is.read(buff)) != -1) {
+						os.write(buff, 0, readLen);
+					}
+
+					//Please have a look into this method for some important comments
+					closeFileHandlers(is, os);
+
+					//To restore File attributes (ex: last modified file time, 
+					//read only flag, etc) of the extracted file, a utility class
+					//can be used as shown below
+					UnzipUtil.applyFileAttributes(fileHeader, outFile);
+
+					System.out.println("Done extracting: " + fileHeader.getFileName());
+				} else {
+					System.err.println("fileheader is null. Shouldn't be here");
+				}
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		} finally {
+			try {
+				closeFileHandlers(is, os);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	private void closeFileHandlers(ZipInputStream is, OutputStream os) throws IOException{
+		//Close output stream
+		if (os != null) {
+			os.close();
+			os = null;
+		}
+
+		//Closing inputstream also checks for CRC of the the just extracted file.
+		//If CRC check has to be skipped (for ex: to cancel the unzip operation, etc)
+		//use method is.close(boolean skipCRCCheck) and set the flag,
+		//skipCRCCheck to false
+		//NOTE: It is recommended to close outputStream first because Zip4j throws 
+		//an exception if CRC check fails
+		if (is != null) {
+			is.close();
+			is = null;
+		}
+	}
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		new ExtractAllFilesWithInputStreams();
+	}
+
+}

Zip4jExamples/src/net/lingala/zip4j/examples/extract/ExtractByLoopAllFiles.java

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+/*
+* Copyright 2010 Srikanth Reddy Lingala  
+* 
+* Licensed under the Apache License, Version 2.0 (the "License"); 
+* you may not use this file except in compliance with the License. 
+* You may obtain a copy of the License at 
+* 
+* http://www.apache.org/licenses/LICENSE-2.0 
+* 
+* Unless required by applicable law or agreed to in writing, 
+* software distributed under the License is distributed on an "AS IS" BASIS, 
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+* See the License for the specific language governing permissions and 
+* limitations under the License. 
+*/
+
+package net.lingala.zip4j.examples.extract;
+
+import java.util.List;
+
+import net.lingala.zip4j.core.ZipFile;
+import net.lingala.zip4j.exception.ZipException;
+import net.lingala.zip4j.model.FileHeader;
+
+/**
+ * Demonstrates extraction of files from a zip file by looping through
+ * all the files in the zip file
+ * 
+ * @author Srikanth Reddy Lingala
+ *
+ */
+
+public class ExtractByLoopAllFiles {
+
+	public ExtractByLoopAllFiles() {
+
+		try {
+			// Initiate ZipFile object with the path/name of the zip file.
+			ZipFile zipFile = new ZipFile("c:\\ZipTest\\ExtractByLoopAllFiles.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!");
+			}
+
+			// Get the list of file headers from the zip file
+			List fileHeaderList = zipFile.getFileHeaders();
+
+			// Loop through the file headers
+			for (int i = 0; i < fileHeaderList.size(); i++) {
+				FileHeader fileHeader = (FileHeader)fileHeaderList.get(i);
+				// Extract the file to the specified destination
+				zipFile.extractFile(fileHeader, "c:\\ZipTest\\");
+			}
+
+		} catch (ZipException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		new ExtractByLoopAllFiles();
+
+	}
+
+}

Zip4jExamples/src/net/lingala/zip4j/examples/extract/ExtractSelectFilesWithInputStream.java

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+package net.lingala.zip4j.examples.extract;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import net.lingala.zip4j.core.ZipFile;
+import net.lingala.zip4j.exception.ZipException;
+import net.lingala.zip4j.io.ZipInputStream;
+import net.lingala.zip4j.model.FileHeader;
+import net.lingala.zip4j.unzip.UnzipUtil;
+
+public class ExtractSelectFilesWithInputStream {
+
+	private final int BUFF_SIZE = 4096;
+
+	public ExtractSelectFilesWithInputStream() {
+
+		ZipInputStream is = null;
+		OutputStream os = null;
+
+		try {
+			// Initiate the ZipFile
+			ZipFile zipFile = new ZipFile("C:\\ZipTest\\ExtractAllFilesWithInputStreams.zip");
+			String destinationPath = "c:\\ZipTest";
+
+			// If zip file is password protected then set the password
+			if (zipFile.isEncrypted()) {
+				zipFile.setPassword("password");
+			}
+
+			//Get the FileHeader of the File you want to extract from the
+			//zip file. Input for the below method is the name of the file
+			//For example: 123.txt or abc/123.txt if the file 123.txt
+			//is inside the directory abc
+			FileHeader fileHeader = zipFile.getFileHeader("yourfilename");
+
+			if (fileHeader != null) {
+
+				//Build the output file
+				String outFilePath = destinationPath + System.getProperty("file.separator") + fileHeader.getFileName();
+				File outFile = new File(outFilePath);
+
+				//Checks if the file is a directory
+				if (fileHeader.isDirectory()) {
+					//This functionality is up to your requirements
+					//For now I create the directory
+					outFile.mkdirs();
+					return;
+				}
+
+				//Check if the directories(including parent directories)
+				//in the output file path exists
+				File parentDir = outFile.getParentFile();
+				if (!parentDir.exists()) {
+					parentDir.mkdirs(); //If not create those directories
+				}
+
+				//Get the InputStream from the ZipFile
+				is = zipFile.getInputStream(fileHeader);
+				//Initialize the output stream
+				os = new FileOutputStream(outFile);
+
+				int readLen = -1;
+				byte[] buff = new byte[BUFF_SIZE];
+
+				//Loop until End of File and write the contents to the output stream
+				while ((readLen = is.read(buff)) != -1) {
+					os.write(buff, 0, readLen);
+				}
+
+				//Closing inputstream also checks for CRC of the the just extracted file.
+				//If CRC check has to be skipped (for ex: to cancel the unzip operation, etc)
+				//use method is.close(boolean skipCRCCheck) and set the flag,
+				//skipCRCCheck to false
+				//NOTE: It is recommended to close outputStream first because Zip4j throws 
+				//an exception if CRC check fails
+				is.close();
+
+				//Close output stream
+				os.close();
+
+				//To restore File attributes (ex: last modified file time, 
+				//read only flag, etc) of the extracted file, a utility class
+				//can be used as shown below
+				UnzipUtil.applyFileAttributes(fileHeader, outFile);
+
+				System.out.println("Done extracting: " + fileHeader.getFileName());
+			} else {
+				System.err.println("FileHeader does not exist");
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * @param args
+	 */
+	public static void main(String[] args) {
+		new ExtractSelectFilesWithInputStream();
+	}
+
+}