网络字节序转换

相当方便实用的一个工具类，原始链接已不可知，改正了一些小错误

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/** 
* 通信格式转换 
* 
* Java和一些windows编程语言如c、c++、delphi所写的网络程序进行通讯时，需要进行相应的转换 
* 高、低字节之间的转换 
* windows的字节序为低字节开头 
* linux,unix的字节序为高字节开头 
* java则无论平台变化，都是高字节开头 
  */
public class FormatTransfer {
    /** 
      * 将int转为低字节在前，高字节在后的byte数组 
      * @param n int 
      * @return byte[] 
      */  
    public static byte[] toLH(int n) {  
      byte[] b = new byte[4];  
      b[0] = (byte) (n & 0xff);  
      b[1] = (byte) (n >> 8 & 0xff);  
      b[2] = (byte) (n >> 16 & 0xff);  
      b[3] = (byte) (n >> 24 & 0xff);  
      return b;  
    }   
      
    /** 
      * 将int转为高字节在前，低字节在后的byte数组 
      * @param n int 
      * @return byte[] 
      */  
    public static byte[] toHH(int n) {  
      byte[] b = new byte[4];  
      b[3] = (byte) (n & 0xff);  
      b[2] = (byte) (n >> 8 & 0xff);  
      b[1] = (byte) (n >> 16 & 0xff);  
      b[0] = (byte) (n >> 24 & 0xff);  
      return b;  
    }   
      
    /** 
      * 将short转为低字节在前，高字节在后的byte数组 
      * @param n short 
      * @return byte[] 
      */  
    public static byte[] toLH(short n) {  
      byte[] b = new byte[2];  
      b[0] = (byte) (n & 0xff);  
      b[1] = (byte) (n >> 8 & 0xff);  
      return b;  
    }   
      
    /** 
      * 将short转为高字节在前，低字节在后的byte数组 
      * @param n short 
      * @return byte[] 
      */  
    public static byte[] toHH(short n) {  
      byte[] b = new byte[2];  
      b[1] = (byte) (n & 0xff);  
      b[0] = (byte) (n >> 8 & 0xff);  
      return b;  
    }   
      
      
      
    /** 
      * 将将int转为高字节在前，低字节在后的byte数组  
     
    public static byte[] toHH(int number) { 
      int temp = number; 
      byte[] b = new byte[4]; 
      for (int i = b.length - 1; i > -1; i--) { 
        b = new Integer(temp & 0xff).byteValue(); 
        temp = temp >> 8; 
      } 
      return b; 
    }  
     
    public static byte[] IntToByteArray(int i) { 
        byte[] abyte0 = new byte[4]; 
        abyte0[3] = (byte) (0xff & i); 
        abyte0[2] = (byte) ((0xff00 & i) >> 8); 
        abyte0[1] = (byte) ((0xff0000 & i) >> 16); 
        abyte0[0] = (byte) ((0xff000000 & i) >> 24); 
        return abyte0; 
    }  
     
     
    */   
      
    /** 
      * 将float转为低字节在前，高字节在后的byte数组 
      */  
    public static byte[] toLH(float f) {  
      return toLH(Float.floatToRawIntBits(f));  
    }   
      
    /** 
      * 将float转为高字节在前，低字节在后的byte数组 
      */  
    public static byte[] toHH(float f) {  
      return toHH(Float.floatToRawIntBits(f));  
    }   
      
    /** 
      * 将String转为byte数组 
      */  
    public static byte[] stringToBytes(String s, int length) {  
      while (s.getBytes().length < length) {  
        s += " ";  
      }  
      return s.getBytes();  
    }   
      
      
    /** 
      * 将字节数组转换为String 
      * @param b byte[] 
      * @return String 
      */  
    public static String bytesToString(byte[] b) {  
      StringBuffer result = new StringBuffer("");  
      int length = b.length;  
      for (int i=0; i<length; i++) {  
        result.append((char)(b[i] & 0xff));  
      }  
      return result.toString();  
    }   
      
    /** 
      * 将字符串转换为byte数组 
      * @param s String 
      * @return byte[] 
      */  
    public static byte[] stringToBytes(String s) {  
      return s.getBytes();  
    }   
      
    /** 
      * 将高字节数组转换为int 
      * @param b byte[] 
      * @return int 
      */  
    public static int hBytesToInt(byte[] b) {  
      int s = 0;  
      for (int i = 0; i < 3; i++) {  
        if (b[i] >= 0) {  
        s = s + b[i];  
        } else {  
        s = s + 256 + b[i];  
        }  
        s = s * 256;  
      }  
      if (b[3] >= 0) {  
        s = s + b[3];  
      } else {  
        s = s + 256 + b[3];  
      }  
      return s;  
    }   
      
    /** 
      * 将低字节数组转换为int 
      * @param b byte[] 
      * @return int 
      */  
    public static int lBytesToInt(byte[] b) {  
      int s = 0;  
      for (int i = 0; i < 3; i++) {  
        if (b[3-i] >= 0) {  
        s = s + b[3-i];  
        } else {  
        s = s + 256 + b[3-i];  
        }  
        s = s * 256;  
      }  
      if (b[0] >= 0) {  
        s = s + b[0];  
      } else {  
        s = s + 256 + b[0];  
      }  
      return s;  
    }   
      
      
    /** 
      * 高字节数组到short的转换 
      * @param b byte[] 
      * @return short 
      */  
    public static short hBytesToShort(byte[] b) {  
      int s = 0;  
      if (b[0] >= 0) {  
        s = s + b[0];  
        } else {  
        s = s + 256 + b[0];  
        }  
        s = s * 256;  
      if (b[1] >= 0) {  
        s = s + b[1];  
      } else {  
        s = s + 256 + b[1];  
      }  
      short result = (short)s;  
      return result;  
    }   
      
    /** 
      * 低字节数组到short的转换 
      * @param b byte[] 
      * @return short 
      */  
    public static short lBytesToShort(byte[] b) {  
      int s = 0;  
      if (b[1] >= 0) {  
        s = s + b[1];  
        } else {  
        s = s + 256 + b[1];  
        }  
        s = s * 256;  
      if (b[0] >= 0) {  
        s = s + b[0];  
      } else {  
        s = s + 256 + b[0];  
      }  
      short result = (short)s;  
      return result;  
    }   
      
    /** 
      * 高字节数组转换为float 
      * @param b byte[] 
      * @return float 
      */  
    public static float hBytesToFloat(byte[] b) {  
      int i = 0;  
      i = ((((b[0]&0xff)<<8 | (b[1]&0xff))<<8) | (b[2]&0xff))<<8 | (b[3]&0xff);  
      return Float.intBitsToFloat(i);  
    }   
      
    /** 
      * 低字节数组转换为float 
      * @param b byte[] 
      * @return float 
      */  
    public static float lBytesToFloat(byte[] b) {  
      int i = 0;  
      i = ((((b[3]&0xff)<<8 | (b[2]&0xff))<<8) | (b[1]&0xff))<<8 | (b[0]&0xff);  
      return Float.intBitsToFloat(i);  
    }   
      
    /** 
      * 将byte数组中的元素倒序排列 
      */  
    public static byte[] bytesReverseOrder(byte[] b) {  
      int length = b.length;  
      byte[] result = new byte[length];  
      for(int i=0; i<length; i++) {  
        result[length-i-1] = b[i];  
      }  
      return result;  
    }   
      
    /** 
      * 打印byte数组 
      */  
    public static void printBytes(byte[] bb) {  
      int length = bb.length;  
      for (int i=0; i<length; i++) {  
        System.out.print(bb[i] + " ");  
      }  
      System.out.println("");  
    }   
      
    public static void logBytes(byte[] bb) {  
      int length = bb.length;  
      String out = "";  
      for (int i=0; i<length; i++) {  
        out = out + bb[i] + " ";  
      }   
      
    }   
      
    /** 
      * 将int类型的值转换为字节序颠倒过来对应的int值 
      * @param i int 
      * @return int 
      */  
    public static int reverseInt(int i) {  
      int result = FormatTransfer.hBytesToInt(FormatTransfer.toLH(i));  
      return result;  
    }   
      
    /** 
      * 将short类型的值转换为字节序颠倒过来对应的short值 
      * @param s short 
      * @return short 
      */  
    public static short reverseShort(short s) {  
      short result = FormatTransfer.hBytesToShort(FormatTransfer.toLH(s));  
      return result;  
    }   
      
    /** 
      * 将float类型的值转换为字节序颠倒过来对应的float值 
      * @param f float 
      * @return float 
      */  
    public static float reverseFloat(float f) {  
      float result = FormatTransfer.hBytesToFloat(FormatTransfer.toLH(f));  
      return result;  
    }   
}