java中十六进制和ASCII码互相转换。

package com.test;

public class StringToHex{

	  public String convertStringToHex(String str){

	  char[] chars = str.toCharArray();

	  StringBuffer hex = new StringBuffer();
	  for(int i = 0; i < chars.length; i++){
	    hex.append(Integer.toHexString((int)chars[i]));
	  }

	  return hex.toString();
	  }

	  public String convertHexToString(String hex){

	  StringBuilder sb = new StringBuilder();
	  StringBuilder temp = new StringBuilder();

	  //49204c6f7665204a617661 split into two characters 49, 20, 4c...
	  for( int i=0; i<hex.length()-1; i+=2 ){

	      //grab the hex in pairs
	      String output = hex.substring(i, (i + 2));
	      //convert hex to decimal
	      int decimal = Integer.parseInt(output, 16);
	      //convert the decimal to character
	      sb.append((char)decimal);

	      temp.append(decimal);
	  }

	  return sb.toString();
	  }

	  //504F533838383834  POS88884
	  public static void main(String[] args) {

	  StringToHex strToHex = new StringToHex();
	  System.out.println("
-----ASCII码转换为16进制 -----");
	  String str = "POS88884"; 
	  System.out.println("字符串: " + str);
	  String hex = strToHex.convertStringToHex(str);
	  System.out.println("转换为16进制 : " + hex);

	  System.out.println("
***** 16进制转换为ASCII *****");
	  System.out.println("Hex : " + hex);
	  System.out.println("ASCII : " + strToHex.convertHexToString(hex));
	  }
	}