ZipBean


1   /*
2    * ZipBean.java
3    *
4    * Created on 18. August 2003, 14:06
5    */
6   
7   package org.contineo.core;
8   
9   import java.io.BufferedOutputStream  ;
10  import java.io.File  ;
11  import java.io.FileOutputStream  ;
12  import java.io.InputStream  ;
13  import java.util.Enumeration  ;
14  
15  import org.apache.log4j.Level;
16  import org.apache.log4j.Logger;
17  import org.apache.tools.zip.ZipEntry;
18  import org.apache.tools.zip.ZipFile;
19  /**
20   * This class is for handling with zip-files.
21   * @author  Michael Scholz
22   * @version 1.0
23   */
24  public class ZipBean {
25   
26      /**
27       * This method extracts all entries of a zip-file.
28       * @param zipsource Path of the zip-file.
29       * @param target Path of the extracted files.
30       * @return True if successfully extracted.
31       */    
32      public static boolean unzip(String   zipsource, String   target) {
33          boolean result = true;
34          try {
35              if(!target.endsWith("/"))
36                  target = target + "/";       
37              ZipFile zip = new ZipFile(zipsource);
38              Enumeration   entries = zip.getEntries();
39              
40              while (entries.hasMoreElements()) {
41                  ZipEntry entry = (ZipEntry) entries.nextElement();
42                  saveEntry(target, zip, entry);
43              }
44  
45              zip.close();
46          }
47          catch (Exception   e) {
48              result = false;
49              logError(e.getMessage());
50          }
51          return result;
52      }
53      
54      /**
55       * This method extracts one entry of a zip-file.
56       * @param zipsource Path of the zip-file.
57       * @param target Path of the extracted files.
58       * @param entry Name of the entry to be extracted.
59       * @return True if successfully extracted.
60       */    
61      public static boolean unzip(String   zipsource, String   target, String   entry) {
62          boolean result = true;
63          try {
64              if(!target.endsWith("/"))
65                  target = target + "/";
66              ZipFile zip = new ZipFile(zipsource);
67              ZipEntry zipe = new ZipEntry(entry);
68              saveEntry(target, zip, zipe);
69          }
70          catch (Exception   e) {
71              result = false;
72              logError(e.getMessage());
73          }
74          return result;
75      }
76      
77      /**
78       * Extracts an entry from a zip file to a target directory.
79       * @param target the base directory the entry should be extracted to
80       * @param zip the ZIP file
81       * @param entry the to be extracted entry in the ZIP file
82       */
83      private static void saveEntry(String   target, ZipFile zip, ZipEntry entry) throws Exception   {
84          String   targetFileName = target + entry.getName();
85          
86          if (entry.isDirectory()) {
87              File   dir = new File  (targetFileName);
88              dir.mkdirs();                   
89          } else {
90              File   file = new File  (targetFileName);
91              File   dir = new File  (file.getParent());
92              dir.mkdirs();
93              dir = null;
94              file = null;
95              
96              InputStream   in = zip.getInputStream(entry);
97              BufferedOutputStream   bos = new BufferedOutputStream  (new FileOutputStream  (targetFileName));
98              byte[] buffer = new byte[1024];
99              int len;
100             while ((len = in.read(buffer)) > 0) {
101                 bos.write(buffer, 0, len);
102             }
103             in.close();
104             bos.close();
105         }
106     }
107     
108     private static void logError(String   message) {
109         Logger logger = LoggingManager.getLogger(org.contineo.core.ZipBean.class);
110         if (logger.isEnabledFor(Level.ERROR))
111             logger.error(message);
112     }   
113 }
114 
115
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