Java采用zip压缩文件代码示例详解编程语言

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(); 
  } 
}