Java解压缩Zip和RAR文件示例

package com.tservice.mrn.common;

import java.io.*;
import java.util.Enumeration;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Expand;
import org.apache.tools.zip.*;

import com.github.junrar.Archive;
import com.github.junrar.rarfile.FileHeader;

public abstract class ZipUtils {

 private static final int BUFFEREDSIZE = 1024;

 /**
  * @SuppressWarnings({ "rawtypes", "resource" }) public static String
  *                     unzip(File zipFile, String unzipDir, String
  *                     zipFileName) throws IOException { ZipFile zf = new
  *                     ZipFile(zipFile); Enumeration enu = zf.entries();
  *                     String result = ""; while (enu.hasMoreElements()) {
  *                     ZipEntry entry = (ZipEntry) enu.nextElement(); String
  *                     name = entry.getName(); //
  *                     如果解压entry是目录，直接生成目录即可，不用写入，如果是文件，要将文件写入 String
  *                     pathParent = unzipDir + "/" + zipFileName; if (!(new
  *                     File(pathParent).exists())) new
  *                     File(pathParent).mkdirs(); String path = pathParent +
  *                     "/" + name; result = result + path + "<br/>
  *                     "; File file = new File(path); if
  *                     (entry.isDirectory()) { file.mkdir(); } else { //
  *                     建议使用如下方式创建流和读取字节，不然会有乱码 InputStream is =
  *                     zf.getInputStream(entry); byte[] buf1 = new
  *                     byte[1024]; int len; if (!file.exists()) {
  *                     file.getParentFile().mkdirs(); file.createNewFile();
  *                     } OutputStream out = new FileOutputStream(file);
  *                     while ((len = is.read(buf1)) > 0) { String buf = new
  *                     String(buf1, 0, len); out.write(buf1, 0, len); } } }
  *                     result = "文件解压成功，解压文件：/n" + result; return result; }
  **/

 /**
  * 解压zip或者rar包的内容到指定的目录下，可以处理其文件夹下包含子文件夹的情况
  *
  * @param zipFilename
  *            要解压的zip或者rar包文件
  * @param outputDirectory
  *            解压后存放的目录
  *
  */
 public static void unzipZipRar(String zipFilename, String outputDirectory)
   throws Exception {
  File outFile = new File(outputDirectory);
  if (!outFile.exists()) {
   outFile.mkdirs();
  }

  ZipFile zipFile = new ZipFile(zipFilename);
  @SuppressWarnings("rawtypes")
  Enumeration en = zipFile.getEntries();
  ZipEntry zipEntry = null;
  while (en.hasMoreElements()) {
   zipEntry = (ZipEntry) en.nextElement();
   if (zipEntry.isDirectory()) {
    // mkdir directory
    String dirName = zipEntry.getName();
    // System.out.println("=dirName is:=" + dirName + "=end=");
    dirName = dirName.substring(0, dirName.length() - 1);
    File f = new File(outFile.getPath() + File.separator + dirName);
    f.mkdirs();
   } else {
    // unzip file
    String strFilePath = outFile.getPath() + File.separator
      + zipEntry.getName();
    File f = new File(strFilePath);

    // 判断文件不存在的话，就创建该文件所在文件夹的目录
    if (!f.exists()) {
     String[] arrFolderName = zipEntry.getName().split("/");
     String strRealFolder = "";
     for (int i = 0; i < (arrFolderName.length - 1); i++) {
      strRealFolder += arrFolderName[i] + File.separator;
     }
     strRealFolder = outFile.getPath() + File.separator
       + strRealFolder;
     File tempDir = new File(strRealFolder);
     // 此处使用.mkdirs()方法，而不能用.mkdir()
     tempDir.mkdirs();
    }
    // the codes remedified by can_do on 2010-07-02 =end=
    f.createNewFile();
    InputStream in = zipFile.getInputStream(zipEntry);
    FileOutputStream out = new FileOutputStream(f);
    try {
     int c;
     byte[] by = new byte[BUFFEREDSIZE];
     while ((c = in.read(by)) != -1) {
      out.write(by, 0, c);
     }
     // out.flush();
    } catch (IOException e) {
     throw e;
    } finally {
     out.close();
     in.close();
    }
   }
  }
 }

 /**
 /**
  * 解压zip格式压缩包 对应的是ant.jar
  */
 private static void unzip(String sourceZip, String destDir)
   throws Exception {
  try {
   Project p = new Project();
   Expand e = new Expand();
   e.setProject(p);
   e.setSrc(new File(sourceZip));
   e.setOverwrite(false);
   e.setDest(new File(destDir));
   /*
    * ant下的zip工具默认压缩编码为UTF-8编码， 而winRAR软件压缩是用的windows默认的GBK或者GB2312编码
    * 所以解压缩时要制定编码格式
    */
   e.setEncoding("gbk");
   e.execute();
  } catch (Exception e) {
   throw e;
  }
 }

 /**
  * 解压rar格式压缩包。
  * 对应的是java-unrar-0.3.jar，但是java-unrar-0.3.jar又会用到commons-logging-1.1.1.jar
  */
 private static void unrar(String sourceRar, String destDir)
   throws Exception {
  Archive a = null;
  FileOutputStream fos = null;
  try {
   a = new Archive(new File(sourceRar));
   FileHeader fh = a.nextFileHeader();
   while (fh != null) {
    if (!fh.isDirectory()) {
     // 1 根据不同的操作系统拿到相应的 destDirName 和 destFileName
     String compressFileName = fh.getFileNameString().trim();
     String destFileName = "";
     String destDirName = "";
     // 非windows系统
     if (File.separator.equals("/")) {
      destFileName = destDir
        + compressFileName.replaceAll("\\\\", "/");
      destDirName = destFileName.substring(0,
        destFileName.lastIndexOf("/"));
      // windows系统
     } else {
      destFileName = destDir
        + compressFileName.replaceAll("/", "\\\\");
      destDirName = destFileName.substring(0,
        destFileName.lastIndexOf("\\"));
     }
     // 2创建文件夹
     File dir = new File(destDirName);
     if (!dir.exists() || !dir.isDirectory()) {
      dir.mkdirs();
     }
     // 3解压缩文件
     fos = new FileOutputStream(new File(destFileName));
     a.extractFile(fh, fos);
     fos.close();
     fos = null;
    }
    fh = a.nextFileHeader();
   }
   a.close();
   a = null;
  } catch (Exception e) {
   throw e;
  } finally {
   if (fos != null) {
    try {
     fos.close();
     fos = null;
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
   if (a != null) {
    try {
     a.close();
     a = null;
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
  }
 }

 /**
  * 解压缩
  */
 public static void deCompress(String sourceFile, String destDir)
   throws Exception {
  // 保证文件夹路径最后是"/"或者"\"
  char lastChar = destDir.charAt(destDir.length() - 1);
  if (lastChar != '/' && lastChar != '\\') {
   destDir += File.separator;
  }
  // 根据类型，进行相应的解压缩
  String type = sourceFile.substring(sourceFile.lastIndexOf(".") + 1);
  if (type.equals("zip")) {
   ZipUtils.unzip(sourceFile, destDir);
  } else if (type.equals("rar")) {
   ZipUtils.unrar(sourceFile, destDir);
  } else {
   throw new Exception("只支持zip和rar格式的压缩包！");
  }
 }

}