创建ZIP和JAR文件 create zip jar

  1. import java.util.zip.*;
  2. import java.io.*;
  4. public class ZipIt {
  5.     public static void main(String args[]) throws IOException {
  6.         if (args.length < 2) {
  7.             System.err.println(“usage: java ZipIt Zip.zip file1 file2 file3”);
  8.             System.exit(-1);
  9.         }
  10.         File zipFile = new File(args[0]);
  11.         if (zipFile.exists()) {
  12.             System.err.println(“Zip file already exists, please try another”);
  13.             System.exit(-2);
  14.         }
  15.         FileOutputStream fos = new FileOutputStream(zipFile);
  16.         ZipOutputStream zos = new ZipOutputStream(fos);
  17.         int bytesRead;
  18.         byte[] buffer = new byte[1024];
  19.         CRC32 crc = new CRC32();
  20.         for (int i=1, n=args.length; i < n; i++) {
  21.             String name = args[i];
  22.             File file = new File(name);
  23.             if (!file.exists()) {
  24.                 System.err.println(“Skipping: “ + name);
  25.                 continue;
  26.             }
  27.             BufferedInputStream bis = new BufferedInputStream(
  28.                 new FileInputStream(file));
  29.             crc.reset();
  30.             while ((bytesRead = bis.read(buffer)) != –1) {
  31.                 crc.update(buffer, 0, bytesRead);
  32.             }
  33.             bis.close();
  34.             // Reset to beginning of input stream  
  35.             bis = new BufferedInputStream(
  36.                 new FileInputStream(file));
  37.             ZipEntry entry = new ZipEntry(name);
  38.             entry.setMethod(ZipEntry.STORED);
  39.             entry.setCompressedSize(file.length());
  40.             entry.setSize(file.length());
  41.             entry.setCrc(crc.getValue());
  42.             zos.putNextEntry(entry);
  43.             while ((bytesRead = bis.read(buffer)) != –1) {
  44.                 zos.write(buffer, 0, bytesRead);
  45.             }
  46.             bis.close();
  47.         }
  48.         zos.close();
  49.     }
  50. }

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