des加密算法

参考网上的朋友的，自己根据自己的实际情况做了一些小改动。

package com.vimtech.bms.webchat.commom.util;


import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.io.IOException;
import java.security.SecureRandom;
//@^@代替+ 防止+参数传递变成空格
public class DESUtil {

    private final static String DES = "DES";
    private final static String key = "abc";
    /**
     * Description 根据键值进行加密
     * @return
     * @throws Exception
     */
    public static String encryptjm(String data) throws Exception {
        byte[] bt = encrypt(data.getBytes("utf-8"), key.getBytes());
        String strs = Base64.encodeBase64String(bt);
        strs = strs.replaceAll("\\+","u0049");
        return strs;
    }
    /**
     * Description 根据键值进行解密
     *
     * @param data
     *            加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decryptjm(String data) throws IOException, Exception {
        if (data == null)
            return null;
        data = data.replaceAll("u0049","\\+");
        byte[] buf = Base64.decodeBase64(data);
        byte[] bt = decrypt(buf, key.getBytes());
        return new String(bt,"utf-8");
    }

    /**
     * Description 根据键值进行加密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     *
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    public static void main(String[] args) throws Exception {
        String data = "{\"userid\":\"chenggong\",\"message\":\"活生生的大富豪的挥挥手说的回复\"}";
        System.out.println(data);
        System.out.println(encryptjm(data));
        System.out.println(decryptjm("FRGar1wWT7scWdlnq5c/YypcinPDXqLE4ige9sN8eF/AsXrGeqmgBRsOc7tfQDkEdAwJVmz2J0FbO91LrPu0049OYGXF6MCNu0049Y25OjeObNesTZVkZobhQRvqPA=="));
        boolean base64 = Base64.isBase64(data);
        System.out.println(base64);
    }
 }