package com.qxueyou.scc.base.util;

import java.security.MessageDigest;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class MD5Utils {  

    private static final String UTF8 = "utf-8";  
  
    private static Logger log = LogManager.getLogger("MD5Utils");
    
    /** 
     * MD5数字签名 
     * @param src 
     * @return 
     * @throws Exception 
     */  
	public static String md5Digest(String src) {
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			byte[] b = md.digest(src.getBytes(UTF8));
			return byte2HexStr(b);
		} catch (Exception e) {
			log.error(e,e);
		} 
		return null;
	} 
	
    /** 
     * 字节数组转化为大写16进制字符串 
     * @param b 
     * @return 
     */  
    private static String byte2HexStr(byte[] b) {  
        StringBuilder sb = new StringBuilder();  
        for (int i = 0; i < b.length; i++) {  
            String s = Integer.toHexString(b[i] & 0xFF);  
            if (s.length() == 1) {  
                sb.append("0");  
            }  
            sb.append(s.toUpperCase());  
        }  
        return sb.toString();  
    }  
    
    /***
	 * MD5加码 生成32位md5码
	 */  
    public static String string2MD5(String inStr){  
        MessageDigest md5 = null;  
        try{  
            md5 = MessageDigest.getInstance("MD5");  
        }catch (Exception e){  
            e.printStackTrace();  
            return "";  
        }  
        char[] charArray = inStr.toCharArray();  
        byte[] byteArray = new byte[charArray.length];  
  
        for (int i = 0; i < charArray.length; i++)  
            byteArray[i] = (byte) charArray[i];  
        byte[] md5Bytes = md5.digest(byteArray);  
        StringBuffer hexValue = new StringBuffer();  
        for (int i = 0; i < md5Bytes.length; i++){  
            int val = ((int) md5Bytes[i]) & 0xff;  
            if (val < 16){
                hexValue.append("0");
            }
            hexValue.append(Integer.toHexString(val));  
        }  
        return hexValue.toString();  
    }  
}