加密算法之MD5与SAH-1

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示例代码：

package com.java.test;import java.security.MessageDigest;public class Demo3 {public static void main(String[] args) {Demo3 demo = new Demo3();System.out.println(demo.digestString("itachi", "MD5"));System.out.println(demo.digestString("itachi", "SHA-1"));}/** * 将信息按指定的算法加密 * @param str：要加密的字符串信息 * @param digestType：加密类型，选择MD5或SAH-1 * @return ：加密之后的内容 */public String digestString(String str, String digestType) {MessageDigest md;String message = "";try {md = MessageDigest.getInstance(digestType);md.update(str.getBytes());message = byteToHex(md.digest());} catch (Exception e) {e.printStackTrace();}return message;}/** * 将字节数组变成十六进制的字符串 * @param bytes：字节数组 * @return：十六进制的字符串 */public String byteToHex(byte[] bytes) {StringBuffer sb = new StringBuffer();for (int i = 0; i < bytes.length; i++) {int num = 0xFF & bytes[i];if(num < 0x10) {sb.append("0" + Integer.toHexString(num));} else {sb.append(Integer.toHexString(num));}}return sb.toString();}}

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