MD5加密

import java.security.MessageDigest;

public class MD5Utils {

	private final static String[] hexDigits ={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
	public static void main(String[] orgs){
		try {
			String str = "origAccount=哇咔咔&secretKey=7201962039";
			String utf8 = new String(str.getBytes("UTF-8")); //gbk转utf-8  
			System.out.println(encodeByMD5(utf8));
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	/**
	 * 对字符串进行加密处理
	 * @param originString 原始字符串
	 * @return
	 */
	public static String encodeByMD5(String originString){ 
	    if(originString != null){ 
	    try{ 
	    //创建具有指定算法名称的信息摘要 
	    MessageDigest md = MessageDigest.getInstance("MD5"); 
	    //使用指定的字节数组对摘要进行最后更新，然后完成摘要计算 
	    byte[] results = md.digest(originString.getBytes()); 
	    //将得到的字节数组变成字符串返回 
	    String resultString = byteArrayToHexString(results); 
	    return resultString;
	    }catch(Exception ex){ 
	        ex.printStackTrace(); 
	       } 
	    } 
	      return null; 
	}
	
	/**
	 * 轮换字节数组为十六进制字符串
	 * 
	 * @param b
	 *            字节数组
	 * @return 十六进制字符串
	 */
	public static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	/**
	 * 将一个字节转化成十六进制形式的字符串
	 */
	public static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n = 256 + n;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}
}