JAVA中的deflate压缩解压实现（一）

/**
 * 压缩.
 *
 * @param inputByte
 *            待压缩的字节数组
 * @return 压缩后的数据
 * @throws IOException
 */
public static byte[] compress(byte[] inputByte) throws IOException {
    int len = 0;
    Deflater defl = new Deflater();
    defl.setInput(inputByte);
    defl.finish();
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    byte[] outputByte = new byte[1024];
    try {
        while (!defl.finished()) {
            // 压缩并将压缩后的内容输出到字节输出流bos中
            len = defl.deflate(outputByte);
            bos.write(outputByte, 0, len);
        }
        defl.end();
    } finally {
        bos.close();
    }
    return bos.toByteArray();
}
/**
 *
 * @param inputByte
 *            待解压缩的字节数组
 * @return 解压缩后的字节数组
 * @throws IOException
 */
public static byte[] uncompress(byte[] inputByte) throws IOException {
    int len = 0;
    Inflater infl = new Inflater();
    infl.setInput(inputByte);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    byte[] outByte = new byte[1024];
    try {
        while (!infl.finished()) {
            // 解压缩并将解压缩后的内容输出到字节输出流bos中
            len = infl.inflate(outByte);
            if (len == 0) {
                break;
            }
            bos.write(outByte, 0, len);
        }
        infl.end();
    } catch (Exception e) {
        //
    } finally {
        bos.close();
    }
    return bos.toByteArray();
}

public static void main(String[] args) {
    try {
        FileInputStream fis = new FileInputStream("D:\\testdeflate.txt");
        int len = fis.available();
        byte[] b = new byte[len];
        fis.read(b);
        byte[] bd = compress(b);
        // 为了压缩后的内容能够在网络上传输，一般采用Base64编码
        String encodestr = Base64.encodeBase64String(bd);
        byte[] bi = uncompress(Base64.decodeBase64(encodestr));
        FileOutputStream fos = new FileOutputStream("D:\\testinflate.txt");
        fos.write(bi);
        fos.flush();
        fos.close();
        fis.close();
    } catch (Exception e) {
        //
    }
}