创建ZIP和JAR文件 create zip jar

  1. import java.util.zip.*;
  2. import java.io.*;
  3. public class ZipIt {
  4.     public static void main(String args[]) throws IOException {
  5.         if (args.length < 2) {
  6.             System.err.println(“usage: java ZipIt Zip.zip file1 file2 file3”);
  7.             System.exit(-1);
  8.         }
  9.         File zipFile = new File(args[0]);
  10.         if (zipFile.exists()) {
  11.             System.err.println(“Zip file already exists, please try another”);
  12.             System.exit(-2);
  13.         }
  14.         FileOutputStream fos = new FileOutputStream(zipFile);
  15.         ZipOutputStream zos = new ZipOutputStream(fos);
  16.         int bytesRead;
  17.         byte[] buffer = new byte[1024];
  18.         CRC32 crc = new CRC32();
  19.         for (int i=1, n=args.length; i < n; i++) {
  20.             String name = args[i];
  21.             File file = new File(name);
  22.             if (!file.exists()) {
  23.                 System.err.println(“Skipping: “ + name);
  24.                 continue;
  25.             }
  26.             BufferedInputStream bis = new BufferedInputStream(
  27.                 new FileInputStream(file));
  28.             crc.reset();
  29.             while ((bytesRead = bis.read(buffer)) != –1) {
  30.                 crc.update(buffer, 0, bytesRead);
  31.             }
  32.             bis.close();
  33.             // Reset to beginning of input stream  
  34.             bis = new BufferedInputStream(
  35.                 new FileInputStream(file));
  36.             ZipEntry entry = new ZipEntry(name);
  37.             entry.setMethod(ZipEntry.STORED);
  38.             entry.setCompressedSize(file.length());
  39.             entry.setSize(file.length());
  40.             entry.setCrc(crc.getValue());
  41.             zos.putNextEntry(entry);
  42.             while ((bytesRead = bis.read(buffer)) != –1) {
  43.                 zos.write(buffer, 0, bytesRead);
  44.             }
  45.             bis.close();
  46.         }
  47.         zos.close();
  48.     }
  49. }

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