Java字符串转16 进制工具类Hex.java

package com.zuidaima.haohui.common.utils;

/**
 * 
 * 16进制值与String/Byte之间的转换 
 * @author JerryLi 
 * @email lijian@dzs.mobi 
 * @data 2011-10-16 
 * http://blog.csdn.net/hzbigdog/article/details/6877712
 * 
 * http://www.blogjava.net/lijinglin/archive/2011/11/02/362567.html
 * 
 * 
 * @project baidamei
 * @author www.zuidaima.com
 * @create 2012-11-14 下午5:53:14
 */
public class Hex {
  /**
   * 字符串转换成十六进制字符串
   * 
   * @param String
   *            str 待转换的ASCII字符串
   * @return String 每个Byte之间空格分隔，如: [61 6C 6B]
   */
  public static String str2HexStr(String str) {

    char[] chars = "0123456789ABCDEF".toCharArray();
    StringBuilder sb = new StringBuilder("");
    byte[] bs = str.getBytes();
    int bit;

    for (int i = 0; i < bs.length; i++) {
      bit = (bs[i] & 0x0f0) >> 4;
      sb.append(chars[bit]);
      bit = bs[i] & 0x0f;
      sb.append(chars[bit]);
      sb.append(' ');
    }
    return sb.toString().trim();
  }

  /**
   * 十六进制转换字符串
   * 
   * @param String
   *            str Byte字符串(Byte之间无分隔符 如:[616C6B])
   * @return String 对应的字符串
   */
  public static String hexStr2Str(String hexStr) {
    String str = "0123456789ABCDEF";
    char[] hexs = hexStr.toCharArray();
    byte[] bytes = new byte[hexStr.length() / 2];
    int n;

    for (int i = 0; i < bytes.length; i++) {
      n = str.indexOf(hexs[2 * i]) * 16;
      n += str.indexOf(hexs[2 * i + 1]);
      bytes[i] = (byte) (n & 0xff);
    }
    return new String(bytes);
  }

  /**
   * bytes转换成十六进制字符串
   * 
   * @param byte[] b byte数组
   * @return String 每个Byte值之间空格分隔
   */
  public static String byte2HexStr(byte[] b) {
    String stmp = "";
    StringBuilder sb = new StringBuilder("");
    for (int n = 0; n < b.length; n++) {
      stmp = Integer.toHexString(b[n] & 0xFF);
      sb.append((stmp.length() == 1) ? "0" + stmp : stmp);
//			sb.append(" ");
    }
    return sb.toString().toUpperCase().trim();
  }

  /**
   * bytes字符串转换为Byte值
   * 
   * @param String
   *            src Byte字符串，每个Byte之间没有分隔符
   * @return byte[]
   */
  public static byte[] hexStr2Bytes(String src) {
    int m = 0, n = 0;
    int l = src.length() / 2;
    System.out.println(l);
    byte[] ret = new byte[l];
    for (int i = 0; i < l; i++) {
      m = i * 2 + 1;
      n = m + 1;
      ret[i] = Byte.decode("0x" + src.substring(i * 2, m) + src.substring(m, n));
    }
    return ret;
  }

  /**
   * String的字符串转换成unicode的String
   * 
   * @param String
   *            strText 全角字符串
   * @return String 每个unicode之间无分隔符
   * @throws Exception
   */
  public static String strToUnicode(String strText) throws Exception {
    char c;
    StringBuilder str = new StringBuilder();
    int intAsc;
    String strHex;
    for (int i = 0; i < strText.length(); i++) {
      c = strText.charAt(i);
      intAsc = (int) c;
      strHex = Integer.toHexString(intAsc);
      if (intAsc > 128)
        str.append("\\u" + strHex);
      else
        // 低位在前面补00
        str.append("\\u00" + strHex);
    }
    return str.toString();
  }

  /**
   * unicode的String转换成String的字符串
   * 
   * @param String
   *            hex 16进制值字符串 （一个unicode为2byte）
   * @return String 全角字符串
   */
  public static String unicodeToString(String hex) {
    int t = hex.length() / 6;
    StringBuilder str = new StringBuilder();
    for (int i = 0; i < t; i++) {
      String s = hex.substring(i * 6, (i + 1) * 6);
      // 高位需要补上00再转
      String s1 = s.substring(2, 4) + "00";
      // 低位直接转
      String s2 = s.substring(4);
      // 将16进制的string转为int
      int n = Integer.valueOf(s1, 16) + Integer.valueOf(s2, 16);
      // 将int转换为字符
      char[] chars = Character.toChars(n);
      str.append(new String(chars));
    }
    return str.toString();
  }
  public static void main(String[] args) {
    String hex = "ef2c71b29202f3e642f2abd8d518f367ec3fbf6a6a61beb678ae0c871ee368ac";
    System.out.println(Hex.hexStr2Str(hex));
  }
}