文件的解压和压缩
package com.kehwa.me17.util;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.Enumeration;/*import java.util.zip.ZipEntry;import java.util.zip.ZipFile;import java.util.zip.ZipOutputStream;*/import org.apache.tools.zip.ZipOutputStream;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipFile;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;/** * 用ZIP压缩和解压缩文件或目录 */public class CompressUtil {private final static Log log = LogFactory.getLog(CompressUtil.class);/** * 压缩文件或者目录 * @param baseDirName压缩的根目录 * @param fileName根目录下待压缩的文件或文件夹名， * 星号*表示压缩根目录下的全部文件。 * @param targetFileName目标ZIP文件 */public static void zipFile(String baseDirName,String targetFileName) {//检测根目录是否存在if (baseDirName == null){log.info("压缩失败，根目录不存在：" + baseDirName);return;}File file = new File(baseDirName);if (!file.exists()){log.info("压缩失败，文件不存在：" + baseDirName);return;}String baseDirPath = file.getAbsolutePath();//目标文件File targetFile = new File(targetFileName);try{//创建一个zip输出流来压缩数据并写入到zip文件 ZipOutputStream out =new ZipOutputStream(new FileOutputStream(targetFile)); if (file.isFile()){CompressUtil.fileToZip(baseDirPath, file, out);} else {CompressUtil.dirToZip(baseDirPath, file, out);}out.close(); log.info("压缩文件成功，目标文件名：" + targetFileName);} catch (IOException e){log.info("压缩失败：" + e);e.printStackTrace();}}/** * 解压缩ZIP文件，将ZIP文件里的内容解压到targetDIR目录下 * @param zipName待解压缩的ZIP文件名 * @param targetBaseDirName目标目录 */public static void upzipFile(String zipFileName, String targetBaseDirName){if (!targetBaseDirName.endsWith(File.separator)){targetBaseDirName += File.separator;} try { //根据ZIP文件创建ZipFile对象 ZipFile zipFile = new ZipFile(zipFileName); ZipEntry entry = null; String entryName = null; String targetFileName = null; byte[] buffer = new byte; int bytes_read; //获取ZIP文件里所有的entry Enumeration entrys = zipFile.getEntries(); //遍历所有entry while (entrys.hasMoreElements()) { entry = (ZipEntry)entrys.nextElement(); //获得entry的名字 entryName =entry.getName(); System.out.println(entryName); targetFileName = targetBaseDirName + entryName; if (entry.isDirectory()){ //如果entry是一个目录，则创建目录 new File(targetFileName).mkdirs(); continue; } else { //如果entry是一个文件，则创建父目录 new File(targetFileName).getParentFile().mkdirs(); } File targetFile = new File(targetFileName); FileOutputStream os = new FileOutputStream(targetFile); InputStreamis = zipFile.getInputStream(entry); while ((bytes_read = is.read(buffer)) != -1){ os.write(buffer, 0, bytes_read); } //关闭流 os.close( ); is.close( ); } log.info("解压缩文件成功！"); } catch (IOException err) { System.err.println("解压缩文件失败: " + err); }}/** * 将目录压缩到ZIP输出流。 */private static void dirToZip(String baseDirPath, File dir, ZipOutputStream out){if (dir.isDirectory()){//列出dir目录下所有文件File[] files= dir.listFiles();// 如果是空文件夹if (files.length == 0){ZipEntry entry = new ZipEntry(getEntryName(baseDirPath, dir));//存储目录信息try {out.putNextEntry(entry);out.closeEntry();} catch (IOException e) {e.printStackTrace();}return;}for (int i=0; i<files.length; i++){if (files.isFile()){//如果是文件，调用fileToZip方法CompressUtil.fileToZip(baseDirPath, files, out);} else {//如果是目录，递归调用CompressUtil.dirToZip(baseDirPath, files, out);}}}}/** * 将文件压缩到ZIP输出流 */private static void fileToZip(String baseDirPath, File file, ZipOutputStream out){FileInputStream in = null;ZipEntry entry = null;//创建复制缓冲区byte[] buffer = new byte; int bytes_read; if (file.isFile()){try {// 创建一个文件输入流in = new FileInputStream(file);//做一个ZipEntryentry = new ZipEntry(getEntryName(baseDirPath, file));//存储项信息到压缩文件out.putNextEntry(entry);//复制字节到压缩文件while((bytes_read = in.read(buffer)) != -1){out.write(buffer, 0, bytes_read); }out.closeEntry();in.close(); log.info("添加文件" + file.getAbsolutePath() + "被到ZIP文件中！");} catch (IOException e){e.printStackTrace();}}}/** * 获取待压缩文件在ZIP文件中entry的名字。即相对于跟目录的相对路径名 * @param baseDirPath * @param file * @return */private static String getEntryName(String baseDirPath, File file){if (!baseDirPath.endsWith(File.separator)){baseDirPath += File.separator;}String filePath = file.getAbsolutePath();// 对于目录，必须在entry名字后面加上"/"，表示它将以目录项存储。if (file.isDirectory()){filePath += "/";}int index = filePath.indexOf(baseDirPath);return filePath.substring(index + baseDirPath.length());}public static void main(String[] args) {//压缩C盘下的temp目录，压缩后的文件是C:/temp.zip/*String baseDirName = "C:/";String fileName = "temp/";String zipFileName = "C:/temp.zip";*/String baseDirName = "E:/plat";String zipFileName = "E:/aa.zip";//CompressUtil.upzipFile("e:/ME3.zip", "E:/");CompressUtil.zipFile("e:/123", "e:/123.zip");//将刚创建的ZIP文件解压缩到D盘的temp目录下//System.out.println();/*String zipFileName = "E:/plat.zip";String fileName = "E:/plat1";upzipFile(zipFileName,fileName);*///CompressUtil.zipFile(baseDirName, fileName, zipFileName);}}补充说明一点，使用java.util.zip包时，是以UTF-8编码格式读取的文件名，因此在中文windows操作系统（Windows操作系统默认字符集为：GBK）中使用时会导致文件名解析错误，因此需要使用org.apache.tools.zip.ZipEntry和 org.apache.tools.zip.ZipOutputStream类来解决这一问题。
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