Java之加密(信息摘要)工具类(依赖：java.security.MessageDigest或org.apache.commons.codec.digest.DigestUtils)

1. java.security.MessageDigest

支持MD5,SHA-1,SHA-256

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;/*** CiphertextUtil** @author ysj*/
public class CiphertextUtil {public static final String MD5 = "MD5";public static final String SHA_1 = "SHA-1";public static final String SHA_256 = "SHA-256";private static final char[] CH_HEX = {'0', '1', '2', '3', '4', '5', '6', '7', '8','9', 'A', 'B', 'C', 'D', 'E', 'F'};/*** 加密字符串** @param sourceStr    需要加密目标字符串* @param algorithmsName 算法名称(如:MD5,SHA-1,SHA-256)* @return*/public static String passAlgorithmsCiphering(String sourceStr,String algorithmsName){String password = "";MessageDigest md;try {md = MessageDigest.getInstance(algorithmsName);// 使用指定byte[]更新摘要md.update(sourceStr.getBytes());// 完成计算，返回结果数组byte[] b = md.digest();password = byteArrayToHex(b);} catch (NoSuchAlgorithmException e) {e.printStackTrace();}return password;}/*** 将字节数组转为十六进制字符串** @param bytes* @return 返回16进制字符串*/private static String byteArrayToHex(byte[] bytes) {// 一个字节占8位，一个十六进制字符占4位；十六进制字符数组的长度为字节数组长度的两倍char[] chars = new char[bytes.length * 2];int index = 0;for (byte b : bytes) {// 取字节的高4位chars[index++] = CH_HEX[b >>> 4 & 0xf];// 取字节的低4位chars[index++] = CH_HEX[b & 0xf];}return new String(chars);}
}## 2. org.apache.commons.codec.digest.DigestUtils
支持MD2,MD5,SHA-1,SHA-256,SHA-384,SHA-512
```java
import org.apache.commons.codec.digest.DigestUtils;/*** CiphertextUtil** @author ysj*/
public class CiphertextUtil {public static final String MD2 = "MD2";public static final String MD5 = "MD5";public static final String SHA_1 = "SHA1";public static final String SHA_256 = "SHA256";public static final String SHA_384 = "SHA384";public static final String SHA_512 = "SHA512";/*** 加密字符串** @param sourceStr    需要加密目标字符串* @param algorithmsName 算法名称(如:MD2,MD5,SHA1,SHA256,SHA384,SHA512)* @return*/public static String passAlgorithmsCiphering(String sourceStr,String algorithmsName){String password = "";switch(algorithmsName){case "MD2":password = DigestUtils.md2Hex(sourceStr);break;case "MD5":password = DigestUtils.md5Hex(sourceStr);break;case "SHA1":password = DigestUtils.sha1Hex(sourceStr);break;case "SHA256":password = DigestUtils.sha256Hex(sourceStr);break;case "SHA384":password = DigestUtils.sha384Hex(sourceStr);break;case "SHA512":password = DigestUtils.sha512Hex(sourceStr);break;}return password;}
}