通过MD5明文加密

通过MD5明文加密

public  static String md5(String source) {
     
		//判断source是否有效
		if(source==null || source.length()==0) {
     
			//如果输入字符串无效，抛出异常
			throw new RuntimeException(CrowdConstant.MESSAFE_STRING_INVALIDATE);
		}
		try {
     
			// 获取MessageDigest对象
			String algorithm="md5";
			MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
			// 获取明文字符串的字节数组
			byte[] input = source.getBytes();
			byte[] output= messageDigest.digest(input);
			// 创建BigInteger对象
			int signum=1;
			BigInteger bigInteger = new BigInteger(signum,output);
			// 按照十六进制把bigInteger转化为字符串
			int radix=16;
			String encoded = bigInteger.toString(radix);
			return encoded;
		} catch (NoSuchAlgorithmException e) {
     
			
			e.printStackTrace();

		}
		return null;		
	}