1. 
import java.io.File;
2. import java.io.FileInputStream;
3. import java.io.FileOutputStream;
4. import java.io.IOException;
5. import java.io.InputStream;
6. import java.io.OutputStream;
7. import java.util.zip.ZipEntry;
8. import java.util.zip.ZipFile;
9. import java.util.zip.ZipInputStream;
10. 
11. 
12. 
13. 
14. public class UnZipDemo
15. {
16. 
17.     public static void main(String [] args) throws IOException
18.     {
19.         File file = new File("F:"+File.separator+"SWT_Designer.zip");//要解压的文件
20. 
21.         File outFile = null;
22.         ZipFile zipFile = new ZipFile(file);//创建压缩文件对象
23.         ZipInputStream zi = null;
24. 
25.         InputStream is = null;
26.         OutputStream os = null;
27.         ZipEntry entry = null ; // 每一个压缩实体
28. 
29.         zi = new ZipInputStream(new FileInputStream(file));// 实例化ZIpInputStream
30. 
31.         String dir = file.getName().substring(0, file.getName().length()-3);//解压后的文件夹名和压缩文件名（不加拓展名）相同
32. 
33.         while((entry=zi.getNextEntry())!=null)//得到一个压缩实体
34.         {
35.             System.out.println("解压缩" + entry.getName() + "文件。") ;
36.             outFile = new File("F:"+ File.separator  + dir+ File.separator + entry.getName()) ; // 定义输出的文件路径
37. 
38.             if(!outFile.getParentFile().exists())       
39.             {
40.                 outFile.getParentFile().mkdir();
41.             }
42. 
43.             if(!outFile.exists())       
44.             {
45.                 if(outFile.isDirectory()||entry.isDirectory())
46.                 {
47.                     outFile.mkdir();
48.                 }else{
49.                     outFile.createNewFile();
50.                 }
51.             }
52. 
53. 
54. 
55. 
56. 
57.             is = zipFile.getInputStream(entry) ;    // 得到每一个实体的输入流
58. 
59. 
60.         if(outFile.isDirectory())
61.         {
62.             continue;
63.         }else
64.         {
65.             os = new FileOutputStream(outFile);
66.                 int len = 0;
67.                 byte [] buf = new byte[1024*10];
68.                 while((len = is.read(buf))!=-1) 
69.                 {
70.                     os.write(buf, 0, len);
71.                 }
72.                     is.close();
73.                     os.close();
74.                     entry.clone();
75. 
76. 
77. 
78.             }
79. 
80. 
81. 
82.         }
83.         zi.close();
84. 
85.     }
86. }