本工具采用的是DES SHA1PRNG 加密，如有興趣，讀者可由此自定義其他加密工具。具體可看代碼注釋

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.*;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * DESUtils 先采用BASE64Encoder對字符串進行處理，避免字符問題。
 * 再采用des 標準的SHA1PRNG加密方法進行加密
 */
public class DESUtils {
    private static Key key;
    private static String KEY_STR = "webapp";//加密秘鑰,請自定義值
    private static String  charset = "UTF-8";
    private static String type = "DES";  //加密標準
    private static String  method="SHA1PRNG"; //加密方法
    private static Cipher cipher; //用于加解密操作的對象

    //初始化key  cipher
    static {
        try {
            KeyGenerator generator = KeyGenerator.getInstance(type); //獲取秘鑰對象
            SecureRandom secureRandom = SecureRandom.getInstance(method);//獲取加密算法的強隨機數對象
            secureRandom.setSeed(KEY_STR.getBytes());//根據key_str生成強隨機數
            generator.init(secureRandom);//初始化秘鑰對象
            key = generator.generateKey();//生成key
            generator = null;
            cipher= Cipher.getInstance(type);//獲取cipher
            cipher.init(Cipher.ENCRYPT_MODE, key);//根據key初始化cipher
        } catch (NoSuchPaddingException e) {
            throw new RuntimeException(e);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (InvalidKeyException e) {
            throw new RuntimeException(e);
        }
    }

    //獲取加密后的字符串
    public static String getEncryptString(String str) {
        BASE64Encoder base64encoder = new BASE64Encoder();
        byte[] bytes = new byte[0];
        try {
            bytes = str.getBytes(charset);
            byte[] doFinal = new byte[0];
            doFinal = cipher.doFinal(bytes);
            return base64encoder.encode(doFinal);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    //獲取加密后的字符串 將字符串解密
    public static String getDecryptString(String str) {
        BASE64Decoder base64decoder = new BASE64Decoder();
        try {
            byte[] bytes = base64decoder.decodeBuffer(str);
            byte[] doFinal = cipher.doFinal(bytes);
            return new String(doFinal, charset);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

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