分享非常有用的Java程序 (关键代码) (三)---创建ZIP和JAR文件

 

import java.util.zip.*;   

import java.io.*;       public class ZipIt {       public static void main(String args[]) throws IOException { if (args.length < 2) {              System.err.println("usage: java ZipIt Zip.zip file1 file2 file3");               System.exit(-1);           }           File zipFile = new File(args[0]);           if (zipFile.exists()) {               System.err.println("Zip file already exists, please try another");System.exit(-2);          }           FileOutputStream fos = new FileOutputStream(zipFile);           ZipOutputStream zos = new ZipOutputStream(fos);           int bytesRead;           byte[] buffer = new byte[1024];           CRC32 crc = new CRC32();           for (int i=1, n=args.length; i < n; i++) {               String name = args[i];               File file = new File(name);               if (!file.exists()) {                   System.err.println("Skipping: " + name);                   continue;               }               BufferedInputStream bis = new BufferedInputStream( new FileInputStream(file));               crc.reset();               while ((bytesRead = bis.read(buffer)) != -1) {                   crc.update(buffer, 0, bytesRead);               }               bis.close();               // Reset to beginning of input stream               bis = new BufferedInputStream(new FileInputStream(file));               ZipEntry entry = new ZipEntry(name);               entry.setMethod(ZipEntry.STORED);              entry.setCompressedSize(file.length());               entry.setSize(file.length());               entry.setCrc(crc.getValue());               zos.putNextEntry(entry);              while ((bytesRead = bis.read(buffer)) != -1) {                   zos.write(buffer, 0, bytesRead);              }               bis.close();           }           zos.close();       }   } }}}