GZips.java

/**
 * 版本修订记录
 * 创建：2013-6-20
 * 版本：
 *
 * 修订1：说明：
 * 修订2：说明：
 */
package org.howsun.util.zip;


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;


/**
 * 描述：GZIP工具
 * @author howsun
 * @version 3.0
 * Building Time 2013-6-20
 * 
 */
public class GZips {
	
	public static final int BUFFER = 1024;
	public static final String EXT = ".gz";

	/** 
	 * 数据压缩 
	 *
	 * @param data 
	 * @return 
	 * @throws IOException 
	 * @throws Exception 
	 */
	public static byte[] compress(byte[] data) throws IOException {
		ByteArrayInputStream bais = new ByteArrayInputStream(data);
		ByteArrayOutputStream baos = new ByteArrayOutputStream();

		// 压缩
		compress(bais, baos);

		byte[] output = baos.toByteArray();

		baos.flush();
		baos.close();

		bais.close();

		return output;
	}

	/** 
	 * 文件压缩 
	 *
	 * @param file 
	 * @throws Exception 
	 */
	public static void compress(File file) throws Exception {
		compress(file, true);
	}

	/** 
	 * 文件压缩 
	 *
	 * @param file 
	 * @param delete 
	 *是否删除原始文件 
	 * @throws Exception 
	 */
	public static void compress(File file, boolean delete) throws Exception {
		FileInputStream fis = new FileInputStream(file);
		FileOutputStream fos = new FileOutputStream(file.getPath() + EXT);

		compress(fis, fos);

		fis.close();
		fos.flush();
		fos.close();

		if (delete) {
			file.delete();
		}
	}

	/** 
	 * 数据压缩 
	 *
	 * @param is 
	 * @param os 
	 * @throws IOException 
	 * @throws Exception 
	 */
	public static void compress(InputStream is, OutputStream os) throws IOException{

		GZIPOutputStream gos = new GZIPOutputStream(os);

		int count;
		byte data[] = new byte[BUFFER];
		while ((count = is.read(data, 0, BUFFER)) != -1) {
			gos.write(data, 0, count);
		}

		gos.finish();

		gos.flush();
		gos.close();
	}
	public static byte[] compress(InputStream is) throws IOException{
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		GZIPOutputStream gos = new GZIPOutputStream(os);
		
		int count;
		byte data[] = new byte[BUFFER];
		while ((count = is.read(data, 0, BUFFER)) != -1) {
			gos.write(data, 0, count);
		}
		
		gos.finish();
		
		gos.flush();
		gos.close();
		
		byte[] output = os.toByteArray();

		os.flush();
		os.close();

		return output;
		
	}

	/** 
	 * 文件压缩 
	 *
	 * @param path 
	 * @throws Exception 
	 */
	public static void compress(String path) throws Exception {
		compress(path, true);
	}

	/** 
	 * 文件压缩 
	 *
	 * @param path 
	 * @param delete 
	 *是否删除原始文件 
	 * @throws Exception 
	 */
	public static void compress(String path, boolean delete) throws Exception {
		File file = new File(path);
		compress(file, delete);
	}

	
	
	
	
	/** 
	 * 数据解压缩 
	 *
	 * @param data 
	 * @return 
	 * @throws IOException 
	 * @throws Exception 
	 */
	public static byte[] decompress(byte[] data) throws IOException {
		ByteArrayInputStream bais = new ByteArrayInputStream(data);
		ByteArrayOutputStream baos = new ByteArrayOutputStream();

		// 解压缩

		decompress(bais, baos);

		data = baos.toByteArray();

		baos.flush();
		baos.close();

		bais.close();

		return data;
	}

	/** 
	 * 文件解压缩 
	 *
	 * @param file 
	 * @throws Exception 
	 */
	public static void decompress(File file) throws Exception {
		decompress(file, true);
	}

	/** 
	 * 文件解压缩 
	 *
	 * @param file 
	 * @param delete 
	 *是否删除原始文件 
	 * @throws Exception 
	 */
	public static void decompress(File file, boolean delete) throws Exception {
		FileInputStream fis = new FileInputStream(file);
		FileOutputStream fos = new FileOutputStream(file.getPath().replace(EXT, ""));
		decompress(fis, fos);
		fis.close();
		fos.flush();
		fos.close();

		if (delete) {
			file.delete();
		}
	}

	/** 
	 * 数据解压缩 
	 *
	 * @param is 
	 * @param os 
	 * @throws IOException 
	 * @throws Exception 
	 */
	public static void decompress(InputStream is, OutputStream os) throws IOException{

		GZIPInputStream gis = new GZIPInputStream(is);

		int count;
		byte data[] = new byte[BUFFER];
		while ((count = gis.read(data, 0, BUFFER)) != -1) {
			os.write(data, 0, count);
		}

		gis.close();
	}

	/** 
	 * 文件解压缩 
	 *
	 * @param path 
	 * @throws Exception 
	 */
	public static void decompress(String path) throws Exception {
		decompress(path, true);
	}

	/** 
	 * 文件解压缩 
	 *
	 * @param path 
	 * @param delete 
	 *是否删除原始文件 
	 * @throws Exception 
	 */
	public static void decompress(String path, boolean delete) throws Exception {
		File file = new File(path);
		decompress(file, delete);
	}
}