Java 解压zip和rar文件

一、解压rar文件。
　　由于WinRAR 是共享软件，并不是开源的，所以解压rar文件的前提是系统已经安装了winrar，比如本人的安装路径是：
　　C:\\Program Files\\WinRAR\\winrar.exe
　　然后运用java.lang.Process 的相关知识来运行系统命令行来实现解压的。
　　winrar 命令行相关参数自己可以搜索下的网上资料很多
　　Java代码：

import java.io.BufferedReader;import java.io.InputStreamReader;/** * 解压rar文件(需要系统安装Winrar 软件) *  * @author Michael sun */public class UnRarFile{/** * 解压rar文件 *  * @param targetPath * @param absolutePath */public void unRarFile(String targetPath, String absolutePath){try{// 系统安装winrar的路径String cmd = "C:\\Program Files\\WinRAR\\winrar.exe";String unrarCmd = cmd + " x -r -p- -o+ " + absolutePath + " "+ targetPath;Runtime rt = Runtime.getRuntime();Process pre = rt.exec(unrarCmd);InputStreamReader isr = new InputStreamReader(pre.getInputStream());BufferedReader bf = new BufferedReader(isr);String line = null;while ((line = bf.readLine()) != null){line = line.trim();if ("".equals(line)){continue;}System.out.println(line);}bf.close();}catch (Exception e){System.out.println("解压发生异常");}}public static void main(String[] args){String targetPath = "D:\\test\\unrar\\";String rarFilePath = "D:\\test\\test.rar";UnRarFile unrar = new UnRarFile();unrar.unRarFile(targetPath, rarFilePath);}}

二、解压zip文件
　　由于zip是免费的，所以在jdk里提供了相应的类对zip文件的实现：
　　java.util.zip.*,详细情况可以参考java API
　　Java代码：

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.util.zip.ZipEntry;import java.util.zip.ZipInputStream;/** * 解压zip文件 *  * @author Michael sun */public class UnzipFile{/** * 解压zip文件 *  * @param targetPath * @param zipFilePath */public void unzipFile(String targetPath, String zipFilePath){try{File zipFile = new File(zipFilePath);InputStream is = new FileInputStream(zipFile);ZipInputStream zis = new ZipInputStream(is);ZipEntry entry = null;System.out.println("开始解压:" + zipFile.getName() + "...");while ((entry = zis.getNextEntry()) != null){String zipPath = entry.getName();try{if (entry.isDirectory()){File zipFolder = new File(targetPath + File.separator+ zipPath);if (!zipFolder.exists()){zipFolder.mkdirs();}}else{File file = new File(targetPath + File.separator+ zipPath);if (!file.exists()){File pathDir = file.getParentFile();pathDir.mkdirs();file.createNewFile();}FileOutputStream fos = new FileOutputStream(file);int bread;while ((bread = zis.read()) != -1){fos.write(bread);}fos.close();}System.out.println("成功解压:" + zipPath);}catch (Exception e){System.out.println("解压" + zipPath + "失败");continue;}}zis.close();is.close();System.out.println("解压结束");}catch (Exception e){e.printStackTrace();}}public static void main(String[] args){String targetPath = "D:\\test\\unzip";String zipFile = "D:\\test\\test.zip";UnzipFile unzip = new UnzipFile();unzip.unzipFile(targetPath, zipFile);}}