前言

Java实现MD5加密&SHA加密码工具类，项目中使用到的，在此记录一下

直接上代码

import java.security.MessageDigest;

public class MD5AndSHA {
	
	public final static String MD5 = "MD5";
	public final static String SHA = "SHA-1"; //SHA-1 SHA-224 SHA-256 SHA-384 SHA-512
	
	public final static String md5(String s){
		return MD5_SHA(s,MD5AndSHA.MD5);
	}
	
	public final static String sha(String s){
		return MD5_SHA(s,MD5AndSHA.SHA);
	}

	public final static String MD5_SHA(String s,String type) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] strTemp = s.getBytes();
			
            //如果输入“SHA”，就是实现SHA加密。
			MessageDigest mdTemp = MessageDigest.getInstance(type); 
			mdTemp.update(strTemp);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
			
		} catch (Exception e) {
			return null;
			
		}
	}

	public static void main(String[] args) {
		
		String sourceStr = "1234";
		System.out.println(" md5加密前" + sourceStr + " 加密后" + MD5AndSHA.md5("1234"));
		System.out.println("sha1加密前" + sourceStr + " 加密后" + MD5AndSHA.sha("1234"));
		
	}
}

测试结果

md5加密前1234 加密后81dc9bdb52d04dc20036dbd8313ed055
sha1加密前1234 加密后7110eda4d09e062aa5e4a390b0a572ac0d2c0220