十万火急，org.apache.tools.zip 解压错误
import   java.util.*;
import   java.util.zip.*;
import   java.io.*;

public   class   TryUnzip   {
public   TryUnzip()   {
}

/**
  *  
  *   解压处理
  *  
  *   @param   zipFileName
  *                         要进行压缩处理的文件(d:\\aa.zip ")
  *   @param   outputDirectory
  *                         压缩处理后的文件路径(d:\\)
  */
public   void   unzip(String   zipFileName,   String   outputDirectory)
throws   Exception   {
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;

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);
System.out.println( "输出路径： "   +   outputDirectory
+   File.separator   +   name);
File   f   =   new   File(outputDirectory   +   File.separator   +   name);
f.mkdir();
System.out.println( "创建目录： "   +   outputDirectory
+   File.separator   +   name);

}   else   {
File   f   =   new   File(outputDirectory   +   File.separator
+   zipEntry.getName());
f.createNewFile();
InputStream   in   =   zipFile.getInputStream(zipEntry);
FileOutputStream   out   =   new   FileOutputStream(f);
//   --------解决了图片失真的情况
int   c;
byte[]   by   =   new   byte[1024];
while   ((c   =   in.read(by))   !=   -1)   {
out.write(by,   0,   c);
}
out.close();
in.close();
}
}

}   catch   (Exception   ex)   {

}

}

public   static   void   main(String[]   args)   {
try   {
TryUnzip   test   =   new   TryUnzip();
test.unzip( "e:\\ok.zip ",   "e:\\ ");
}   catch   (Exception   e)   {
e.printStackTrace(System.out);
}
}

}


这个源码是在网上找的，有很多回帖的人说可以用。ant.jar是在自己机器上搜的，里面有ZipFile这个类，可是就不不成功。
Exception   in   thread   "main "   java.lang.NoSuchMethodError:   org.apache.tools.zip.ZipEntry:   method   <init> ()V   not   found
at   org.apache.tools.zip.ZipFile.populateFromCentralDirectory(ZipFile.java:253)
at   org.apache.tools.zip.ZipFile. <init> (ZipFile.java:142)
at   org.apache.tools.zip.ZipFile