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HomeJavajavaTutorialDetailed explanation of compression and decompression examples in java ant package

这篇文章主要介绍了java ant包中的org.apache.tools.zip实现压缩和解压缩实例详解的相关资料,需要的朋友可以参考下

java ant包中的org.apache.tools.zip实现压缩和解压缩实例详解

其实apache中的ant包(请自行GOOGLE之ant.jar)中有一个更好的类,已经支持中文了,我们就不重复制造轮子了,拿来用吧,
这里最主要的功能是实现了 可以指定多个文件 到同一个压缩包的功能

用org.apache.tools.zip压缩/解压缩zip文件的例子,用来解决中文乱码问题。

实例代码:

import Java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;
import java.util.zip.Deflater;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

/**
 * 功能:使用Apache Ant里提供的org.apache.tools.zip实现zip压缩和解压 (支持中文文件名)
 * 解决了由于java.util.zip包不支持汉字的问题。 使用java.util.zip包时,当zip文件中有名字为中文的文件时,
 * 就会出现异常:"Exception in thread "main " java.lang.IllegalArgumentException at
 * java.util.zip.ZipInputStream.getUTF8String(ZipInputStream.java:285)
 * 
 * @author 夏明龙 E-mail:邮箱
 * @version 创建时间:2013-3-22 上午10:40:21 类说明:
 */
public class AntZipUtil {
 private static List list = new ArrayList();

 private static List listFile(String path) {
 File file = new File(path);
 String[] array = null;
 String sTemp = "";

 if (!file.isDirectory()) {
  return null;
 }
 array = file.list();
 if (array.length > 0) {
  for (int i = 0; i < array.length; i++) {
  sTemp = path + array[i];
  file = new File(sTemp);
  if (file.isDirectory()) {
   listFile(sTemp + "/");
  } else
   list.add(sTemp);
  }
 } else {
  return null;
 }

 return list;
 }

 public static void zip(String needtozipfilepath, String zipfilepath){
 try {
  byte[] b = new byte[512];

  File needtozipfile = new File(needtozipfilepath);

  if (!needtozipfile.exists()) {
  System.err.println("指定的要压缩的文件或目录不存在.");
  return;
  }

  String zipFile = zipfilepath;
  File targetFile = new File(zipFile.substring(0, zipFile.indexOf("\\") + 1));

  if (!targetFile.exists()) {
  System.out.println("指定的目标文件或目录不存在.");
  return;
  }

  String filepath = needtozipfilepath;
  List fileList = listFile(filepath);
  FileOutputStream fileOutputStream = new FileOutputStream(zipFile);
  CheckedOutputStream cs = new CheckedOutputStream(fileOutputStream,new CRC32());
  ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(cs));

  for (int i = 0; i < fileList.size(); i++) {
  InputStream in = new FileInputStream((String) fileList.get(i));
  String fileName = ((String) fileList.get(i)).replace(File.separatorChar, &#39;/&#39;);
  fileName = fileName.substring(fileName.indexOf("/") + 1);
  ZipEntry e = new ZipEntry(fileName);
  out.putNextEntry(e);
  int len = 0;
  while ((len = in.read(b)) != -1) {
   out.write(b, 0, len);
  }
  out.closeEntry();
  }
  out.close();
 } catch (Exception e) {
  e.printStackTrace();
 }
 }

 // ///////////////////////////////////////
 /**
 * 压缩文件 或者 文件夹
 * 
 * @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
 * @param targetFileName
 *      目标ZIP 文件 星号 "*" 表示压缩根目录下的全部文件
 * 
 */
 public static boolean zip(String baseDirName, String[] fileNames,
  String targetFileName, String encoding) {
 boolean flag = false;
 try {
  // 判断 "压缩的根目录"是否存在! 是否是一个文件夹!
  File baseDir = new File(baseDirName);
  if (!baseDir.exists() || (!baseDir.isDirectory())) {
  System.err.println("压缩失败! 根目录不存在: " + baseDirName);
  return false;
  }

  // 得到这个 "压缩的根目录" 的绝对路径
  String baseDirPath = baseDir.getAbsolutePath();

  // 由这个 "目标 ZIP 文件" 文件名得到一个 压缩对象 ZipOutputStream
  File targetFile = new File(targetFileName);
  ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
   targetFile));
  // 中文有乱码,引进下面的改造类
  // CnZipOutputStream out = new CnZipOutputStream(new
  // FileOutputStream(targetFile),encoding);

  // 设置压缩编码Apache Ant有个包专门处理ZIP文件,可以指定文件名的编码方式。由此可以解决问题。例如:用
  // org.apache.tools.zip.ZipOutputStream代替java.util.zip.ZipOutputStream。ZipOutputStream
  // out = .....; out.setEncoding("GBK");
  // out.setEncoding("GBK");//设置为GBK后在windows下就不会乱码了,如果要放到Linux或者Unix下就不要设置了
  out.setEncoding(encoding);

  // "*" 表示压缩包括根目录 baseDirName 在内的全部文件 到 targetFileName文件下
  if (fileNames.equals("*")) {
  AntZipUtil.dirToZip(baseDirPath, baseDir, out);
  } else {
  File[] files = new File[fileNames.length];
  for (int i = 0; i < files.length; i++) {
   // 根据 parent 抽象路径名和 child 路径名字符串创建一个新 File 实例。
   files[i] = new File(baseDir, fileNames[i]);
  }
  if (files[0].isFile()) {
   // 调用本类的一个静态方法 压缩一个文件
   // CompressUtil.fileToZip(baseDirPath, file, out);
   AntZipUtil.filesToZip(baseDirPath, files, out);
  }

  }
  out.close();
  // System.out.println("压缩成功! 目标文件名为: " + targetFileName);
  flag = true;
 } catch (FileNotFoundException e) {
  e.printStackTrace();
 } catch (IOException e) {
  e.printStackTrace();
 }
 return flag;
 }

 /**
 * 将文件压缩到Zip 输出流
 * 
 * @param baseDirPath
 *      根目录路径
 * @param file
 *      要压缩的文件
 * @param out
 *      输出流
 * @throws IOException
 */
 private static void fileToZip(String baseDirPath, File file,
  ZipOutputStream out) throws IOException {
 //
 FileInputStream in = null;
 org.apache.tools.zip.ZipEntry entry = null;
 // 创建复制缓冲区 1024*4 = 4K
 byte[] buffer = new byte[1024 * 4];
 int bytes_read = 0;
 if (file.isFile()) {
  in = new FileInputStream(file);
  // 根据 parent 路径名字符串和 child 路径名字符串创建一个新 File 实例
  String zipFileName = getEntryName(baseDirPath, file);
  entry = new org.apache.tools.zip.ZipEntry(zipFileName);
  // "压缩文件" 对象加入 "要压缩的文件" 对象
  out.putNextEntry(entry);
  // 现在是把 "要压缩的文件" 对象中的内容写入到 "压缩文件" 对象
  while ((bytes_read = in.read(buffer)) != -1) {
  out.write(buffer, 0, bytes_read);
  }
  out.closeEntry();
  in.close();
  // System.out.println("添加文件" + file.getAbsolutePath()+ "被添加到 ZIP
  // 文件中!");
 }
 }

 /**
 * 多个文件目录压缩到Zip 输出流
 * 
 * @param baseDirPath
 * @param files
 * @param out
 * @throws IOException
 */
 @SuppressWarnings("unused")
 private static void filesToZip(String baseDirPath, File[] files,
  ZipOutputStream out) throws IOException {
 // 遍历所有的文件 一个一个地压缩
 for (int i = 0; i < files.length; i++) {
  File file = files[i];
  if (file.isFile()) {
  // 调用本类的一个静态方法 压缩一个文件
  AntZipUtil.fileToZip(baseDirPath, file, out);
  } else {
  /*
   * 这是一个文件夹 所以要再次得到它下面的所有的文件 这里是自己调用自己..............递归..........
   */
  AntZipUtil.dirToZip(baseDirPath, file, out);
  }
 }
 }

 /**
 * 将文件目录压缩到Zip 输出流
 * 
 * @param baseDirPath
 * @param dir
 * @param out
 * @throws IOException
 */
 private static void dirToZip(String baseDirPath, File dir,
  ZipOutputStream out) throws IOException {
 // 得到一个文件列表 (本目录下的所有文件对象集合)
 File[] files = dir.listFiles();
 // 要是这个文件集合数组的长度为 0 , 也就证明了这是一个空的文件夹,虽然没有再循环遍历它的必要,但是也要把这个空文件夹也压缩到目标文件中去
 if (files.length == 0) {
  // 根据 parent 路径名字符串和 child 路径名字符串创建一个新 File 实例
  String zipFileName = getEntryName(baseDirPath, dir);
  org.apache.tools.zip.ZipEntry entry = new org.apache.tools.zip.ZipEntry(
   zipFileName);
  out.putNextEntry(entry);
  out.closeEntry();
 } else {
  // 遍历所有的文件 一个一个地压缩
  for (int i = 0; i < files.length; i++) {
  File file = files[i];
  if (file.isFile()) {
   // 调用本类的一个静态方法 压缩一个文件
   AntZipUtil.fileToZip(baseDirPath, file, out);
  } else {
   /*
   * 这是一个文件夹 所以要再次得到它下面的所有的文件
   * 这里是自己调用自己..............递归..........
   */
   AntZipUtil.dirToZip(baseDirPath, file, out);
  }
  }
 }
 }

 /**
 * 获取 待压缩文件在 ZIP 文件中的 entry的名字,即相对于根目录的相对路径名
 * 
 * @param baseDirPath
 *      根目录
 * @param file
 * @return
 */
 private static String getEntryName(String baseDirPath, File file) {
 /**
  * 改变 baseDirPath 的形式 把 "C:/temp" 变成 "C:/temp/"
  */
 if (!baseDirPath.endsWith(File.separator)) {
  baseDirPath += File.separator;
 }
 String filePath = file.getAbsolutePath();
 /**
  * 测试此抽象路径名表示的文件是否是一个目录。 要是这个文件对象是一个目录 则也要变成 后面带 "/" 这个文件对象类似于
  * "C:/temp/人体写真/1.jpg" 要是这个文件是一个文件夹 则也要变成 后面带 "/"
  * 因为你要是不这样做,它也会被压缩到目标文件中 但是却不能正解显示 也就是说操作系统不能正确识别它的文件类型(是文件还是文件夹)
  */
 if (file.isDirectory()) {
  filePath += "/";
 }
 int index = filePath.indexOf(baseDirPath);
 return filePath.substring(index + baseDirPath.length());
 }

 // //////////////////////////解压缩////////////////////////////////////////
 /**
 * 调用org.apache.tools.zip实现解压缩,支持目录嵌套和中文名
 * 也可以使用java.util.zip不过如果是中文的话,解压缩的时候文件名字会是乱码。原因是解压缩软件的编码格式跟java.util.zip.ZipInputStream的编码字符集(固定是UTF-8)不同
 * 
 * @param zipFileName
 *      要解压缩的文件
 * @param outputDirectory
 *      要解压到的目录
 * @throws Exception
 */
 public static boolean unZip(String zipFileName, String outputDirectory) {
 boolean flag = false;
 try {
  org.apache.tools.zip.ZipFile zipFile = new org.apache.tools.zip.ZipFile(
   zipFileName);
  java.util.Enumeration e = zipFile.getEntries();
  org.apache.tools.zip.ZipEntry zipEntry = null;
  createDirectory(outputDirectory, "");
  while (e.hasMoreElements()) {
  zipEntry = (org.apache.tools.zip.ZipEntry) e.nextElement();
  // System.out.println("unziping " + zipEntry.getName());
  if (zipEntry.isDirectory()) {
   String name = zipEntry.getName();
   name = name.substring(0, name.length() - 1);
   File f = new File(outputDirectory + File.separator + name);
   f.mkdir();
   System.out.println("创建目录:" + outputDirectory
    + File.separator + name);
  } else {
   String fileName = zipEntry.getName();
   fileName = fileName.replace(&#39;\\&#39;, &#39;/&#39;);
   // System.out.println("测试文件1:" +fileName);
   if (fileName.indexOf("/") != -1) {
   createDirectory(outputDirectory, fileName.substring(0,
    fileName.lastIndexOf("/")));
   fileName = fileName.substring(
    fileName.lastIndexOf("/") + 1, fileName
     .length());
   }

   File f = new File(outputDirectory + File.separator
    + zipEntry.getName());

   f.createNewFile();
   InputStream in = zipFile.getInputStream(zipEntry);
   FileOutputStream out = new FileOutputStream(f);

   byte[] by = new byte[1024];
   int c;
   while ((c = in.read(by)) != -1) {
   out.write(by, 0, c);
   }
   out.close();
   in.close();
  }
  flag = true;
  }
 } catch (Exception ex) {
  ex.printStackTrace();
 }
 return flag;
 }

 /**
 * 创建目录
 * 
 * @param directory
 *      父目录
 * @param subDirectory
 *      子目录
 */
 private static void createDirectory(String directory, String subDirectory) {
 String dir[];
 File fl = new File(directory);
 try {
  if (subDirectory == "" && fl.exists() != true)
  fl.mkdir();
  else if (subDirectory != "") {
  dir = subDirectory.replace(&#39;\\&#39;, &#39;/&#39;).split("/");
  for (int i = 0; i < dir.length; i++) {
   File subFile = new File(directory + File.separator + dir[i]);
   if (subFile.exists() == false)
   subFile.mkdir();
   directory += File.separator + dir[i];
  }
  }
 } catch (Exception ex) {
  System.out.println(ex.getMessage());
 }
 }

 // /////////////////////////////////////

 public static void main(String[] temp) {
 // 压缩
 String baseDirName = "C:\\";
 String[] fileNames = { "中文1.doc", "中文2.doc" };
 String zipFileName = "c:\\中文.zip";
 // 压缩多个指定的文件 到ZIP
  System.out.println(AntZipUtil.zip(baseDirName, fileNames,zipFileName,"GBK"));

 //压缩一个文件夹 到ZIP
 String sourcePath = "c:\\test\\";
 String zipFilePath = "c:\\中文2.zip";
 AntZipUtil.zip(sourcePath, zipFilePath);

 //解压缩
 //System.out.println(AntZipUtil.unZip("c:\\中文.zip", "c:\\中文"));
 }

}

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