package com;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;

public class ComFn {
	public static String bytesToHexString(byte[] src, int len){
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || len <= 0) {
            return null;
        }
        for (int i = 0; i < len; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v).toUpperCase();
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv + " ");
        }
        return stringBuilder.toString();
    }
	
	/** 
     * String ת»» ByteBuffer 
     * @param str 
     * @return 
     */  
    public static ByteBuffer getByteBuffer(String str)  
    {  
        return ByteBuffer.wrap(str.getBytes());  
    }  
  
    /** 
     * ByteBuffer ת»» String 
     * @param buffer 
     * @return 
     */  
    public static String getString(ByteBuffer buffer)  
    {  
        Charset charset = null;  
        CharsetDecoder decoder = null;  
        CharBuffer charBuffer = null;  
        try  
        {
            charset = Charset.forName("UTF-8");
            decoder = charset.newDecoder();
            // charBuffer = decoder.decode(buffer);//ÓÃÕâ¸öµÄ»°£¬Ö»ÄÜÊä³öÀ´Ò»´Î½á¹û£¬µÚ¶þ´ÎÏÔʾΪ¿Õ  
            charBuffer = decoder.decode(buffer.asReadOnlyBuffer());  
            return charBuffer.toString();
        }
        catch (Exception ex)
        {
            ex.printStackTrace();  
            return "";  
        }  
    }  
}