java安全架构____java SHA加密

package com.security.sha;

import java.security.MessageDigest;

/**
 * @author Administrator
 * sha 加密 推荐先
 */
public class Sha {
	public static void main(String[] args) throws Exception {
		System.out.println("简单的sha加密__:"+shaEncode("123456"));
		//避免不同人密文相同
		System.out.println("带key映射的加密__:"+shaKeyEncode("zhangsan","123456"));
	}
	public static String shaEncode(String generalStr) throws Exception {
		MessageDigest messageDigest = MessageDigest.getInstance("SHA");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-384");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
		messageDigest.update(generalStr.getBytes("UTF-8"));
		byte[] bytes = messageDigest.digest();
		String shaStr = "";
		for (int i = 0; i < bytes.length; i++) {
			String hex = Integer.toHexString(bytes[i] & 0xFF);
			if (hex.length()<2) {
				hex = hex + "0";
			}
			shaStr = shaStr + hex;
		}
		return shaStr;
	}
	public static String shaKeyEncode(String username,String password) throws Exception {
		String generalStr=username+password;
		MessageDigest messageDigest = MessageDigest.getInstance("SHA");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-384");
		// MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
		messageDigest.update(generalStr.getBytes("UTF-8"));
		byte[] bytes = messageDigest.digest();
		String shaStr = "";
		for (int i = 0; i < bytes.length; i++) {
			String hex = Integer.toHexString(bytes[i] & 0xFF);
			if (hex.length()<2) {
				hex = hex + "0";
			}
			shaStr = shaStr + hex;
		}
		return shaStr;
	}

}

//运行结果

//网上结果对比