java压缩（gzip,Inflater,Deflater ）资料与字符串

java压缩（gzip,Inflater,Deflater ）文件与字符串
压缩目标越大，压缩效果越明显！

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class ByteTest {

	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		String issueIds = "10068111,10068112,10068113,10068114,10068115,10068116,"
				+ "10068117,10068118,10068119,10068120,10068121,10068122,10068123,"
				+ "10068124,10068125,10068126,10068127,10068128,10068129,10068130,"
				+ "10068131,10068132,10068133,10068134,10068135,10068136,10068137,"
				+ "10068138,10068139,10068140,10068141,10068142,10068143,10068144,"
				+ "10068145,10068146,10068147,10068148,10068149,10068150,10068151";
		System.err.println("彩期数:" + (issueIds.split(",")).length);
		System.err.println("源字符串长度:" + issueIds.length());

		String comp = compress(issueIds);
		System.err.println("压缩后字符串长度:" + comp.length());

		String uncomp = uncompress(comp);
		System.err.println("解压后字符串长度:" + uncomp.length() );
		
		System.err.println("解压是否丢失：" + !issueIds.equals(uncomp));
	}

	// 压缩
	public static String compress(String str) throws IOException {
		if (str == null || str.length() == 0) {
			return str;
		}
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		GZIPOutputStream gzip = new GZIPOutputStream(out);
		gzip.write(str.getBytes());
		gzip.close();
		return out.toString("ISO-8859-1");
	}

	// 解压缩
	public static String uncompress(String str) throws IOException {
		if (str == null || str.length() == 0) {
			return str;
		}
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		ByteArrayInputStream in = new ByteArrayInputStream(
				str.getBytes("ISO-8859-1"));
		GZIPInputStream gunzip = new GZIPInputStream(in);
		byte[] buffer = new byte[256];
		int n;
		while ((n = gunzip.read(buffer)) >= 0) {
			out.write(buffer, 0, n);
		}
		return out.toString();
	}
        public static byte[] encode(String srcString) throws UnsupportedEncodingException {
		byte[] input = srcString.getBytes("UTF-8");
		byte[] output = new byte[input.length * 2];
		Deflater compresser = new Deflater();
		try {
			compresser.setInput(input);
			compresser.finish();
			int compressedDataLength = compresser.deflate(output);
			byte[] contentByte = new byte[compressedDataLength];
			System.arraycopy(output, 0, contentByte, 0, compressedDataLength);
			return contentByte;
		} finally {
			compresser.end();
		}
	}
	
	public static String decode(byte[] encodeByte) {
		String outputString = "";
		try {
			boolean flag = true;
			int resultLength = 0;
			byte[] result = null;
			int i = 1;

			while (flag) {
				Inflater decompresser = new Inflater();
				try {
					result = new byte[encodeByte.length * 20 * i];
					decompresser.setInput(encodeByte, 0, encodeByte.length);
					resultLength = decompresser.inflate(result);
					if (decompresser.getRemaining() == 0) {
						flag = false;
					}
				} finally {
					decompresser.end();
				}
				i++;
			}

			outputString = new String(result, 0, resultLength, "UTF-8");
		} catch (Exception e) {
			e.printStackTrace();
		}
		return outputString;
	}

}