package chapter03;   import java.io.*;   import java.util.Enumeration;   import java.util.zip.*;   public class Test07 {       static final int BUFFER = 2048;       public static void unZip()throws Exception{           String fileName = "E:\\jdbc.zip";           String filePath = "E:\\aaa\\";           ZipFile zipFile = new ZipFile(fileName);           Enumeration emu = zipFile.entries();           int i=0;           while(emu.hasMoreElements()){               ZipEntry entry = (ZipEntry)emu.nextElement();               //会把目录作为一个file读出一次，所以只建立目录就可以，之下的文件还会被迭代到。                              if (entry.isDirectory()){                   System.out.println("entry is a directory");                   new File(filePath + entry.getName()).mkdirs();                   continue;               }                              BufferedInputStream bis = new BufferedInputStream(zipFile.getInputStream(entry));               File file = new File(filePath + entry.getName());               //加入这个的原因是zipfile读取文件是随机读取的，这就造成可能先读取一个文件               //而这个文件所在的目录还没有出现过，所以要建出目录来。               //File parent = file.getParentFile();               //if(parent != null && (!parent.exists())){               //  parent.mkdirs();               //}               FileOutputStream fos = new FileOutputStream(file);               ObjectOutputStream bos = new ObjectOutputStream(fos);               int count;               byte data[] = new byte[BUFFER];               while ((count = bis.read(data, 0, BUFFER)) != -1){                   bos.write(data, 0, count);               }               bos.flush();               bos.close();               bis.close();           }           zipFile.close();         }       public static void main(String [] args) throws Exception{           String from="e:\\jdbc.zip";           String to="e:\\aaa\\";           unZip1(from,to);       }       public static void unZip1(String from,String to)throws Exception{           //String from="e:\\aaa.zip";           //String to="E:\\aaa\\";           if(!new File(to).exists()){               new File(to).mkdir();           }           ZipFile file=new ZipFile(from);           Enumeration e=file.entries();           int byte_read;           byte [] buffer=new byte[4096];           while(e.hasMoreElements()){               ZipEntry entry=(ZipEntry)e.nextElement();               if(entry.isDirectory()){                   //String filename=entry.getName();                   new File(to+entry.getName()).mkdirs();                   continue;               }               DataInputStream ois=new DataInputStream(file.getInputStream(entry));               File f=new File(to+entry.getName());               FileOutputStream fos=new FileOutputStream(f);               ObjectOutputStream oos=new ObjectOutputStream(fos);               while((byte_read=ois.read(buffer))!=-1){                   oos.write(buffer,0,byte_read);               }               oos.flush();               oos.close();               ois.close();           }                  }   }