java常用的加密算法有MD5（Message Digest algorithm 5，信息摘要算法）
BASE64（严格地说，属于编码格式，而非加密算法）
SHA（Secure Hash Algorithm，安全散列算法）
HMAC（Hash Message Authentication Code，散列消息鉴别码）
CryptoTools （对称分组式加密）
前四种是常用的也是基本耳熟的加密算法，这里主要解释CryptoTools算法，现将代码贴与这里，与大家分享。
package com.lzjs.lzgdesbgateway.util;
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class CryptoTools {
private final byte[] DESkey = "[email protected]".getBytes("UTF-8");// 设置密钥，略去
private final byte[] DESIV = {0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB, (byte) 0xCD, (byte) 0xEF};//
设置向量，略去
private AlgorithmParameterSpec iv = null;// 加密算法的参数接口，IvParameterSpec是它的一个实现
private Key key = null;
public CryptoTools() throws Exception {
DESKeySpec keySpec = new DESKeySpec(DESkey);// 设置密钥参数
iv = new IvParameterSpec(DESIV);// 设置向量
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂
key = keyFactory.generateSecret(keySpec);// 得到密钥对象
}
public String encode(String data) throws Exception {
Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");// 得到加密对象Cipher
enCipher.init(Cipher.ENCRYPT_MODE, key, iv);// 设置工作模式为加密模式，给出密钥和向量
byte[] pasByte = enCipher.doFinal(data.getBytes("utf-8"));
BASE64Encoder base64Encoder = new BASE64Encoder();
return base64Encoder.encode(pasByte);
}
public String decode(String data) throws Exception {
Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
deCipher.init(Cipher.DECRYPT_MODE, key, iv);
BASE64Decoder base64Decoder = new BASE64Decoder();
byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
return new String(pasByte, "UTF-8");
}
public static void main(String[] args) {
try {
String test = "4132413241241324";
CryptoTools des = new CryptoTools();
System.out.println("加密前的字符："+test);
System.out.println("加密后的字符："+des.encode(test));
System.out.println("解密后的字符："+des.decode(des.encode(test)));
} catch (Exception e) {
e.printStackTrace();
}
}
}