AES 对称加密

package com.skynet.rimp.common.utils.string;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESUtil {

    private static final String key = "yunyou17lw";

    /**
     * 加密
     * @param content 需要加密的内容
     * @param password  加密密码
     * @return
     */
    private static byte[] encryptByte(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(byteContent);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     * @param content  待解密内容
     * @param password 解密密钥
     * @return
     */
    private static byte[] decryptByte(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES");// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 加密
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * AES加密
     * @param str
     * @return
     */
    public static String encrypt(String str) {
        return BinaryHex.binary2Hex(encryptByte(str, key));
    }

    /**
     * AES解密
     * @param str
     * @return
     */
    public static String decrypt(String str) throws UnsupportedEncodingException {
        // 16进制转2进制
        byte[] decryptFrom = BinaryHex.hex2Byte(str);
        // 根据byte进行解码
        byte[] decryptResult = decryptByte(decryptFrom, key);
        return new String(decryptResult,"UTF-8");
    }

    public static void main(String[] args) throws UnsupportedEncodingException {
        String str = "发多少房间打扫看来减肥鲁大师 <br>///fdsfds房贷首付斯蒂芬是";
        // 加密
        System.out.println("加密前：" + str);
        String s = AESUtil.encrypt(str);
        System.out.println("加密后：" + s);

        System.out.println("解密后：" + AESUtil.decrypt(s));
    }
}

package com.skynet.rimp.common.utils.string;

/**
 * 2进制/16进制互转
 *
 * @author Jieven
 * @date 2014-5-12
 */
public class BinaryHex {

    /**
     * 2进制转16进制
     * @param bString 2进制字符串
     * @return
     */
    public static String binary2Hex(String bString) {
        if (bString == null || bString.equals("") || bString.length() % 8 != 0)
            return null;
        StringBuffer tmp = new StringBuffer();
        int iTmp = 0;
        for (int i = 0; i < bString.length(); i += 4) {
            iTmp = 0;
            for (int j = 0; j < 4; j++) {
                iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);
            }
            tmp.append(Integer.toHexString(iTmp));
        }
        return tmp.toString();
    }

    /**
     * 16进制转2进制
     * @param hexString
     * @return
     */
    public static String hex2Binary(String hexString) {
        if (hexString == null || hexString.length() % 2 != 0)
            return null;
        String bString = "", tmp;
        for (int i = 0; i < hexString.length(); i++) {
            tmp = "0000" + Integer.toBinaryString(Integer.parseInt(hexString.substring(i, i + 1), 16));
            bString += tmp.substring(tmp.length() - 4);
        }
        return bString;
    }

    /**
     * 将二进制转换成16进制
     * @param buf
     * @return
     */
    public static String binary2Hex(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     * @param hexStr
     * @return
     */
    public static byte[] hex2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    public static void main(String[] args) {
        String bString = "1010101111001101";
        System.out.println(binary2Hex(bString));

        String hexString = "ABCD";
        System.out.println(hex2Binary(hexString));
    }
}

一共两个类，可制作成工具类