java加密工具类

package cn.vicky.utils;

import java.security.MessageDigest;

public class MD5 {
//	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
//			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
//
//	/**
//	 * 转换字节数组为16进制字串
//	 * 
//	 * @param b
//	 *            字节数组
//	 * @return 16进制字串
//	 */
//
//	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();
//	}
//
//	private 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];
//	}
    
    
        /** 
         * 将16位byte[] 转换为32位String 
         *  
         * @param buffer 
         * @return 
         */  
        private static String toHex(byte buffer[]) {  
            StringBuilder sb = new StringBuilder(buffer.length * 2);  
            for (int i = 0; i < buffer.length; i++) {  
                sb.append(Character.forDigit((buffer[i] & 240) >> 4, 16));  
                sb.append(Character.forDigit(buffer[i] & 15, 16));  
            }  

            return sb.toString();  
        }  


	public static String MD5Encode(String origin) {
		String resultString = null;

		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");     // MD5    SHA    SHA1    SHA-1

			resultString = toHex(md.digest(resultString
					.getBytes()));
			
//                        或者
//                        resultString = byteArrayToHexString(md.digest(resultString
//					.getBytes()));
		} catch (Exception ex) {

		}
		return resultString;
	}
        
        
        public static String SHAEncode(String origin) {
        
		String resultString = null;

		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("SHA");
			resultString = toHex(md.digest(resultString
					.getBytes()));
                        
//                      或者
//			resultString = byteArrayToHexString(md.digest(resultString
//					.getBytes()));
		} catch (Exception ex) {

		}
		return resultString;
        }
}

 

 

更多内容,可以参见:

http://blog.csdn.net/eclipser1987/article/details/5158784