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【Java】模拟PHP的pack和unpack类

作者:奕男 / 发布于2016/4/12/ 637

package qghl.intp.util;
 
import java.io.IOException;
import java.io.InputStream;
 
public class PackUtil{
 
        /**
         * 打包字符串
         * 类似php中pack在java中的实现
         *
         * @param str
         * @return
         */
        public static byte[] pack(String str) {
            int nibbleshift = 4;
            int position = 0;
            int len = str.length() / 2 + str.length() % 2;
            byte[] output = new byte[len];
            for (char v : str.toCharArray()) {
                byte n = (byte) v;
                if (n >= '0' && n <= '9') {
                    n -= '0';
                } else if (n >= 'A' && n <= 'F') {
                    n -= ('A' - 10);
                } else if (n >= 'a' && n <= 'f') {
                    n -= ('a' - 10);
                } else {
                    continue;
                }
                output[position] |= (n << nibbleshift);
 
                if (nibbleshift == 0) {
                    position++;
                }
                nibbleshift = (nibbleshift + 4) & 7;
            }
 
            return output;
        }
 
        /**
         * 16进制的字符解压 类php中unpack
         *
         * @param is
         * @param len
         * @return
         * @throws IOException
         */
        public static String unpack(InputStream is, int len) throws IOException {
            byte[] bytes = new byte[len];
            is.read(bytes);
            return unpack(bytes);
        }
 
        /***
         * 16进制的字符解压  类php中unpack
         * @param bytes
         * @return
         */
        public static String unpack(byte[] bytes) {
            StringBuilder stringBuilder = new StringBuilder("");
            if (bytes == null || bytes.length <= 0) {
                return null;
            }
            for (int i = 0; i < bytes.length; i++) {
                int v = bytes[i] & 0xFF;
                String hv = Integer.toHexString(v);
                if (hv.length() < 2) {
                    stringBuilder.append(0);
                }
                stringBuilder.append(hv);
            }
            return stringBuilder.toString();
        }
    }

试试其它关键字

　unpack　

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