数据库配置文件用户名和密码加密解密

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
import java.security.SecureRandom;

public class Test7 {
    private static Key key;
    private static String KEY_STR = "mykey";

    static {
        try {
            KeyGenerator generator = KeyGenerator.getInstance("DES");
            SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(KEY_STR.getBytes());
            generator.init(secureRandom);
            key = generator.generateKey();
            generator = null;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    //对字符串进行加密，返回BASE64的加密字符串
    public  String getEncryptString(String str){
        BASE64Encoder base64Encoder = new BASE64Encoder();
        try
        {
            byte[] strBytes = str.getBytes("UTF-8");
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return base64Encoder.encode(encryptStrBytes);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }

    }

    //对BASE64加密字符串进行解密
    public static String getDecryptString(String str){
        BASE64Decoder base64Decoder = new BASE64Decoder();
        try
        {
            byte[] strBytes = base64Decoder.decodeBuffer(str);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return new String(encryptStrBytes,"UTF-8");
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }

    }
}

配置文件加密后引用问题：
配置文件如下：

jdbc-driver=com.mysql.jdbc.Driver
jdbc-url=jdbc:mysql://localhost:3306/sale?useUnicode=true&characterEncoding=UTF-8
jdbc-user=Ov4j7fKiCzY=
jdbc-password=Ov4j7fKiCzY=

第一步：
新建类继承PropertyPlaceholderConfigurer类，重写getDecryptString方法

package cn.kgc.tools;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import sun.misc.BASE64Decoder;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
import java.security.SecureRandom;

public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
    private String[] encryptPropNames = {"jdbc-user", "jdbc-password"};
    private static Key key;
    private static String KEY_STR="mykey";

    static{
        try
        {
            KeyGenerator generator = KeyGenerator.getInstance("DES");
            SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");
            secureRandom.setSeed(KEY_STR.getBytes());
            generator.init(secureRandom);
            key = generator.generateKey();
            generator=null;
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }
    private boolean isEncryptProp(String propertyName)
    {
        for (String encryptName : encryptPropNames)
        {
            if (encryptName.equals(propertyName))
            {
                return true;
            }
        }
        return false;
    }
    
    public static String getDecryptString(String str){
        BASE64Decoder base64Decoder = new BASE64Decoder();
        try
        {
            byte[] strBytes = base64Decoder.decodeBuffer(str);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] encryptStrBytes = cipher.doFinal(strBytes);
            return new String(encryptStrBytes,"UTF-8");
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }

    }

    @Override
    protected String convertProperty(String propertyName, String propertyValue){
        //如果在加密属性名单中发现该属性
        if (isEncryptProp(propertyName)){
            String decryptValue = getDecryptString(propertyValue);
            System.out.println(decryptValue);
            return decryptValue;
        }else {
            return propertyValue;
        }
    }
}

第二步：
引用配置文件：

代替：

第三步：

数据源配置如下：