md5、sha哈希加密简单工具类_hashutil.md5-优快云博客

本文介绍了一个Java工具类，用于实现MD5、SHA-1、SHA-256及SHA-512等不同哈希算法的字符串加密功能。该工具类提供了灵活的编码选项，并确保了加密过程的简便性和可靠性。

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md5、sha哈希加密简单工具类：

package com.cjh.java.tools;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * 加密工具
 * @author 陈嘉豪
 *
 */
public final class EncryptionUtils {
	
	private static final String ENCODE = "UTF-8";
	
	private static final class AlgorithmInstants{
		private static final String MD5 = "MD5";
		private static final String SHA_1 = "SHA-1";
		private static final String SHA_256 = "SHA-256";
		private static final String SHA_512 = "SHA-512";
	}
	/**
	 * 将字符串用MD5算法加密
	 * @param str 需要加密的字符串
	 * @return 返回长度为32位的字符串
	 * @throws Exception
	 */
	public static String getStrByMD5(String str) throws Exception{
		return getStrByAlgorithm(str, AlgorithmInstants.MD5, ENCODE);
	}
	/**
	 * 将字符串用MD5算法加密
	 * @param str 需要加密的字符串
	 * @param encode 指定编码，默认为UTF-8
	 * @return 返回长度为32位的字符串
	 * @throws Exception
	 */
	public static String getStrByMD5(String str,String encode) throws Exception{
		if(encode==null || encode.replaceAll(" ", "").length()<=0){
			encode="UTF-8";
		}
		return getStrByAlgorithm(str, AlgorithmInstants.MD5, encode);
	}
	/**
	 * 将字符串用SHA-1算法加密
	 * @param str 需要加密的字符串
	 * @return 返回长度为40位的字符串
	 * @throws Exception
	 */
	public static String getStrBySHA1(String str) throws Exception{
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_1, ENCODE);
	}
	/**
	 * 将字符串用SHA-1算法加密
	 * @param str 需要加密的字符串
	 * @param encode 指定编码，默认为UTF-8
	 * @return 返回长度为40位的字符串
	 * @throws Exception
	 */
	public static String getStrBySHA1(String str,String encode) throws Exception{
		if(encode==null || encode.replaceAll(" ", "").length()<=0){
			encode="UTF-8";
		}
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_1, encode);
	}
	/**
	 * 将字符串用SHA256算法加密
	 * @param str 需要加密的字符串
	 * @return 返回长度为128位的字符串
	 * @throws Exception
	 */
	public static String getStrBySHA256(String str) throws Exception{
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_256, ENCODE);
	}
	/**
	 * 将字符串用SHA256算法加密
	 * @param str 需要加密的字符串
	 * @param encode 指定编码，默认为UTF-8
	 * @return 返回长度为128位的字符串
	 * @throws Exception
	 */
	public static String getStrBySHA256(String str,String encode) throws Exception{
		if(encode==null || encode.replaceAll(" ", "").length()<=0){
			encode="UTF-8";
		}
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_256, encode);
	}
	/**
	 * 将字符串用SHA512算法加密
	 * @param str 需要加密的字符串
	 * @return
	 * @throws Exception
	 */
	public static String getStrBySHA512(String str) throws Exception{
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_512, ENCODE);
	}
	/**
	 * 将字符串用SHA512算法加密
	 * @param str 需要加密的字符串
	 * @param encode 指定编码，默认为UTF-8
	 * @return
	 * @throws Exception
	 */
	public static String getStrBySHA512(String str,String encode) throws Exception{
		if(encode==null || encode.replaceAll(" ", "").length()<=0){
			encode="UTF-8";
		}
		return getStrByAlgorithm(str, AlgorithmInstants.SHA_512, encode);
	}
	
	/**
	 * 根据加密算法进行加密
	 * @param str
	 * @param algorithmName
	 * @param ecode
	 * @return
	 * @throws NoSuchAlgorithmException
	 * @throws UnsupportedEncodingException
	 */
	private static  String getStrByAlgorithm(String str,String algorithmName,String encode) throws NoSuchAlgorithmException, UnsupportedEncodingException{
		MessageDigest messageDigest = MessageDigest.getInstance(algorithmName);
		messageDigest.update(str.getBytes(encode));
		return byteToHex( messageDigest.digest() );
	}
	
	/**
	 * 将字节转换成十六进制
	 * @param bytes
	 * @return
	 */
	private static  String byteToHex(byte[] bytes){
		if(bytes!=null){
			StringBuffer stringBuffer = new StringBuffer();
	        String temp = null;
	        for (int i=0;i<bytes.length;i++){
	            temp = Integer.toHexString(bytes[i] & 0xFF);
	            if (temp.length()==1){
	                stringBuffer.append("0");
	            }
	            stringBuffer.append(temp);
	        }
	        return stringBuffer.toString();
		}
		return null;
	}
}