1 package  zhenyu.tools.file;
  2
 3 import  java.io. * ;
  4
 5 import  java.util. * ;
  6 import  java.util.zip. * ;
  7
 8
 9 public   class  Unzip  {
 10      public  Unzip()  {
 11     }
12
13      public   static   void  main(String[] args)  {
 14         Unzip unzip  =   new  Unzip();
 15         unzip.UnzipFile( " D:\\tmp.zip " ,  " e:\\tmp " );
 16     }
17
18      public   static   final   void  copyInputStream(InputStream in, OutputStream out)
 19          throws  IOException  {
 20          byte [] buffer  =   new   byte [ 1024 ];
 21          int  len;
 22
23          while  ((len  =  in.read(buffer))  >=   0 )
 24             out.write(buffer,  0 , len);
 25
26         in.close();
 27         out.close();
 28     }
29
30      private   void  UnzipFile(String from, String to)  {
 31         Enumeration entries;
 32         ZipFile zipFile;
 33
34          if  (from  ==   null )  {
 35             System.err.println( " Usage: Unzip zipfile " );
 36
37              return ;
 38         }
39
40          try   {
 41             zipFile  =   new  ZipFile(from);
 42             entries  =  zipFile.entries();
 43
44              while  (entries.hasMoreElements())  {
 45                 ZipEntry entry  =  (ZipEntry) entries.nextElement();
 46                 System.out.println(entry.getName());
 47
48                  if  (entry.getName().lastIndexOf( " \\ " )  !=   - 1 )  {
 49
50                     System.out.println( " Extracting directory:  "   +  to  +
51                         File.separator  +  entry.getName());
 52
53                     String txt;
 54                     StringTokenizer st  =   new  StringTokenizer(entry.getName(),
 55                              " \\ " );
 56                      for  ( int  i  =   0 ; st.hasMoreTokens() && i < st.countTokens(); i ++ )  {
 57                         txt  =  st.nextToken().trim();
 58                          if  (to.endsWith( " \\ " ))  {
 59                             File myFilePath  =   new  File(to  +  txt);
 60
61                              if  ( ! myFilePath.exists())  {
 62                                 myFilePath.mkdir();
 63                             }
64                         }   else   {
 65                             File myFilePath  =   new  File(to  +  File.separator  +
66                                     txt);
 67
68                              if  ( ! myFilePath.exists())  {
 69                                 myFilePath.mkdir();
 70                             }
71                         }
72                     }
73                 }
74
75                 System.out.println( " Extracting file:  "   +  to  +  File.separator  +
76                     entry.getName());
 77                 System.out.println( " -------------------------------------- " );
 78
79                                 copyInputStream(zipFile.getInputStream(entry),
 80                                      new  BufferedOutputStream(
 81                                          new  FileOutputStream(to  +  File.separator  +  entry.getName())));
 82             }
83
84             zipFile.close();
 85         }   catch  (IOException ioe)  {
 86             System.err.println( " Unhandled exception: " );
 87             ioe.printStackTrace();
 88
89              return ;
 90         }
91     }
92 }
93
压缩包文件结构：
|-tem
       |-folderA
                   |-filea
                   |-fileb
                   |-filec
       |-filed
解压后文件结构：
|-tem
       |-folderA
                   |-filea
                   |-fileb
                   |-filec
       |-filed