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

原文: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();
				}
	}
		}
	}
}

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