bytechange.java

WAP PUSH后台源码,WAP PUSH后台源码

package com.sxit.dl;

import java.text.*;

/**
 * <p>名称： ByteChange.java</p>
 * <p>功能： 提供byte[]与int,string之间的转换</p>
 * <p>日期： 2005/12/6</p>
 * <p>作者： TOMPAN</p>
 *  not attributable
 */

public class ByteChange {
  public ByteChange() {
  }

  //a.将长整数转化为byte[],高位在前。
  public static byte[] longToBytes(long value){
    byte[] b = new byte[4];
    b[0] = (byte)(value >> 24);
    b[1] = (byte)(value >> 16);
    b[2] = (byte)(value >> 8);
    b[3] = (byte)value ;
    return b;
  }

  //b.将byte[]转化为int,在java中int占4*8位，不必使用long.
  public static int bytesToInt(byte[] b,int pos){
    int b1,b2,b3,b4;
    b1 = (int)b[pos];
    b2 = (int)b[pos+1];
    b3 = (int)b[pos+2];
    b4 = (int)b[pos+3];
    if(b1<0){
      b1 = b1 + 256;
    }
    if(b2<0){
      b2 = b2 + 256;
    }
    if(b3<0){
      b3 = b3 + 256;
    }
    if(b4<0){
      b4 = b4 + 256;
    }
    return (b1 << 24) + (b2 << 16) + (b3 << 8) + b4;
  }

  //c.将字符串转化为byte[]
  public static byte[] strToBytes(String s){
    return s.getBytes();
  }

  //d.将byte[]转化为String
  public static String bytesToStr(byte[] b,int pos,int len){
    byte[] rb = new byte[len];
    System.arraycopy(b,pos,rb,0,len);
    return new String(rb);
  }

  //e.将byte[](含中文)转化为String，以GBK编码,这个不需要逆向工程
  public static String gbbytesToStr(byte[] b,int pos,int len){
    String s = "";
    byte[] rb = new byte[len];
    System.arraycopy(b,pos,rb,0,len);
    try{
      s = new String(rb,"GBK");
    }catch(java.io.UnsupportedEncodingException e){
    }

    return s;

  }

  //获取当前格式化时间
  public static String getCurrentTime(){
    java.util.Date currentTime = new java.util.Date();
    SimpleDateFormat simpDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
    String currentTimeStr = simpDateFormat.format(currentTime);
    return currentTimeStr;
  }

  //UNICODE转换为String
  public static String UnicodeToStr(String UnicodeStr) throws Exception {
    UnicodeStr = UnicodeStr.toUpperCase();
    int ii = 0;
    String str = "";
    String sx = "";
    while (ii + 4 <= UnicodeStr.length()) {
      sx = UnicodeStr.substring(ii, ii + 4);
      str = str + HexStrToChar4(sx);
      ii = ii + 4;
    }
//    str = new String(str.getBytes("ISO-8859-1"),"gb2312");
    return str;
  }

  public static String AsciiToStr(String AsciiStr) throws Exception {
    int ii = 0;
    String str = "";
    String sx = "";
    while (ii + 2 <= AsciiStr.length()) {
      sx = AsciiStr.substring(ii, ii + 2);
      str = str + HexStrToChar2(sx);
      ii = ii + 2;
    }
    str = new String(str.getBytes("ISO-8859-1"),"gb2312");
    return str;
  }

  private static char HexStrToChar2(String HexStr) {
    if (HexStr.length() != 2)
      return (char)0;
    int ii;
    ii = CharToInt(HexStr.charAt(0))*16 + CharToInt(HexStr.charAt(1));
    return (char)ii;
  }

  public static char HexStrToChar4(String HexStr) {
    if (HexStr.length() != 4)
      return (char)0;
    int ii;
    ii = CharToInt(HexStr.charAt(0))*256*16 + CharToInt(HexStr.charAt(1))*256
          + CharToInt(HexStr.charAt(2))*16 + CharToInt(HexStr.charAt(3));
    return (char)ii;
  }

  public static int CharToInt(char c) {
    int re;
    re = (int)c;
    if ( (re <= 57) && (re >= 48) )
      re = re - 48;
    else if ( (re >= 65) && (re <= 70) )
      re = re - 55;
    else
      re = 0;
    return re;
  }

}