使用注解+RequestBodyAdvice实现http请求内容加解密方式

注解主要用来指定那些需要加解密的controller方法

实现比较简单

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface SecretAnnotation {
    boolean encode() default false;
    boolean decode() default false;
}

使用时添加注解在controller的方法上

    @PostMapping("/preview")
    @SecretAnnotation(decode = true)
    public ResponseVO<ContractSignVO> previewContract(@RequestBody FillContractDTO fillContractDTO)  {
        return contractSignService.previewContract(fillContractDTO);
    }

请求数据由二进制流转为类对象数据，对于加密过的数据，需要在二进制流被处理之前进行解密，否则在转为类对象时会因为数据格式不匹配而报错。

因此使用RequestBodyAdvice的beforeBodyRead方法来处理。

@Slf4j
@RestControllerAdvice
public class MyRequestControllerAdvice implements RequestBodyAdvice {
    @Override
    public boolean supports(MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        return methodParameter.hasParameterAnnotation(RequestBody.class);
    }
    @Override
    public Object handleEmptyBody(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        return o;
    }
    @Autowired
    private MySecretUtil mySecretUtil;
    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) throws IOException {
        if (methodParameter.getMethod().isAnnotationPresent(SecretAnnotation.class)) {
            SecretAnnotation secretAnnotation = methodParameter.getMethod().getAnnotation(SecretAnnotation.class);
            if (secretAnnotation.decode()) {
                return new HttpInputMessage() {
                    @Override
                    public InputStream getBody() throws IOException {
                        List<String> appIdList = httpInputMessage.getHeaders().get("appId");
                        if (appIdList.isEmpty()){
                            throw new RuntimeException("请求头缺少appID");
                        }
                        String appId = appIdList.get(0);
                        String bodyStr = IOUtils.toString(httpInputMessage.getBody(),"utf-8");
                        bodyStr = mySecretUtil.decode(bodyStr,appId);
                        return  IOUtils.toInputStream(bodyStr,"utf-8");
                    }
                    @Override
                    public HttpHeaders getHeaders() {
                        return httpInputMessage.getHeaders();
                    }
                };
            }
        }
        return httpInputMessage;
    }
    @Override
    public Object afterBodyRead(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        return o;
    }
}

mySecretUtil.decode(bodyStr,appId)的内容是，通过请求头中的AppID去数据库中查找对于的秘钥，之后进行解密，返回解密后的字符串。

再通过common.io包中提供的工具类IOUtils将字符串转为inputstream流，替换HttpInputMessage，返回一个body数据为解密后的二进制流的HttpInputMessage。

Stringboot RequestBodyAdvice接口如何实现请求响应加解密

在实际项目中，我们常常需要在请求前后进行一些操作，比如：参数解密/返回结果加密，打印请求参数和返回结果的日志等。这些与业务无关的东西，我们不希望写在controller方法中，造成代码重复可读性变差。这里，我们讲讲使用@ControllerAdvice和RequestBodyAdvice、ResponseBodyAdvice来对请求前后进行处理（本质上就是AOP），来实现日志记录每一个请求的参数和返回结果。

1.加解密工具类

package com.linkus.common.utils;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import javax.annotation.PostConstruct;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Hex;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class Aes {
    /**
     *
     * @author ngh
     * AES128 算法
     *
     * CBC 模式
     *
     * PKCS7Padding 填充模式
     *
     * CBC模式需要添加偏移量参数iv，必须16位
     * 密钥 sessionKey，必须16位
     *
     * 介于java 不支持PKCS7Padding，只支持PKCS5Padding 但是PKCS7Padding 和 PKCS5Padding 没有什么区别
     * 要实现在java端用PKCS7Padding填充，需要用到bouncycastle组件来实现
     */
    private String sessionKey="加解密密钥";
    // 偏移量 16位
    private static  String iv="偏移量";
    // 算法名称
    final String KEY_ALGORITHM = "AES";
    // 加解密算法/模式/填充方式
    final String algorithmStr = "AES/CBC/PKCS7Padding";
    // 加解密 密钥 16位
    byte[] ivByte;
    byte[] keybytes;
    private Key key;
    private Cipher cipher;
    boolean isInited = false;
    public void init() {
        // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
        keybytes = iv.getBytes();
        ivByte = iv.getBytes();
        Security.addProvider(new BouncyCastleProvider());
        // 转化成JAVA的密钥格式
        key = new SecretKeySpec(keybytes, KEY_ALGORITHM);
        try {
            // 初始化cipher
            cipher = Cipher.getInstance(algorithmStr, "BC");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    /**
     * 加密方法
     *
     * @param content
     *            要加密的字符串
     *            加密密钥
     * @return
     */
    public String encrypt(String content) {
        byte[] encryptedText = null;
        byte[] contentByte = content.getBytes();
        init();
        try {
            cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(ivByte));
            encryptedText = cipher.doFinal(contentByte);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return new String(Hex.encode(encryptedText));
    }
    /**
     * 解密方法
     *
     * @param encryptedData
     *            要解密的字符串
     *            解密密钥
     * @return
     */
    public String decrypt(String encryptedData) {
        byte[] encryptedText = null;
        byte[] encryptedDataByte = Hex.decode(encryptedData);
        init();
        try {
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivByte));
            encryptedText = cipher.doFinal(encryptedDataByte);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return new String(encryptedText);
    }
    public static void main(String[] args) {
        Aes aes = new Aes();
        String a="{\n" +
                "\"distance\":\"1000\",\n" +
                "\"longitude\":\"28.206471\",\n" +
                "\"latitude\":\"112.941301\"\n" +
                "}";
        //加密字符串
        //String content = "孟飞快跑";
        // System.out.println("加密前的：" + content);
//        System.out.println("加密密钥：" + new String(keybytes));
        // 加密方法
        String enc = aes.encrypt(a);
        System.out.println("加密后的内容：" + enc);
        String dec="";
        // 解密方法
        try {
            dec = aes.decrypt(enc);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("解密后的内容：" + dec);
    }
}

2.请求解密

前端页面传过来的是密文，我们需要在Controller获取请求之前对密文解密然后传给Controller

package com.linkus.common.filter;
import com.alibaba.fastjson.JSON;
import com.linkus.common.constant.KPlatResponseCode;
import com.linkus.common.exception.CustomException;
import com.linkus.common.exception.JTransException;
import com.linkus.common.service.util.MyHttpInputMessage;
import com.linkus.common.utils.Aes;
import com.linkus.common.utils.http.HttpHelper;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.lang.Nullable;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.lang.reflect.Type;
/**
 * 请求参数 解密操作
 *
 * @Author: Java碎碎念
 * @Date: 2019/10/24 21:31
 *
 */
@Component
//可以配置指定需要解密的包，支持多个
@ControllerAdvice(basePackages = {"com.linkus.project"})
@Slf4j
public class DecryptRequestBodyAdvice implements RequestBodyAdvice {
    Logger log = LoggerFactory.getLogger(getClass());
    Aes aes=new Aes();
    @Override
    public boolean supports(MethodParameter methodParameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
    	//true开启功能，false关闭这个功能
        return true;
    }
//在读取请求之前做处理
    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter methodParameter, Type targetType, Class<? extends HttpMessageConverter<?>> selectedConverterType) throws IOException {
        //获取请求数据
        String string = "";
        BufferedReader bufferedReader = null;
        InputStream inputStream = inputMessage.getBody();
            //这个request其实就是入参 可以从这里获取流
            //入参放在HttpInputMessage里面  这个方法的返回值也是HttpInputMessage
            try {
            string=getRequestBodyStr(inputStream,bufferedReader);
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    throw ex;
                }
            }
        }
        /*****************进行解密start*******************/
        String decode = null;
        if(HttpHelper.isEncrypted(inputMessage.getHeaders())){
        try {
            //            //解密操作
            //Map<String,String> dataMap = (Map)body;
            //log.info("接收到原始请求数据={}", string);
            // inputData 为待加解密的数据源
			//解密
            decode= aes.decrypt(string);
            //log.info("解密后数据={}",decode);
        } catch (Exception e ) {
            log.error("加解密错误:",e);
           throw  new CustomException(KPlatResponseCode.MSG_DECRYPT_TIMEOUT,KPlatResponseCode.CD_DECRYPT_TIMEOUT);
        }
        //把数据放到我们封装的对象中
        }else{
            decode = string;
        }
       // log.info("接收到请求数据={}", decode);
//        log.info("接口请求地址{}",((HttpServletRequest)inputMessage).getRequestURI());
        return new MyHttpInputMessage(inputMessage.getHeaders(), new ByteArrayInputStream(decode.getBytes("UTF-8")));
    }
    @Override
    public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return body;
    }
    @Override
    public Object handleEmptyBody(@Nullable Object var1, HttpInputMessage var2, MethodParameter var3, Type var4, Class<? extends HttpMessageConverter<?>> var5) {
        return var1;
    }
	//自己写的方法，不是接口的方法，处理密文
    public String getRequestBodyStr( InputStream inputStream,BufferedReader bufferedReader) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
            if (inputStream != null) {
                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                char[] charBuffer = new char[128];
                int bytesRead = -1;
                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                    stringBuilder.append(charBuffer, 0, bytesRead);
                }
            } else {
                stringBuilder.append("");
            }
        String string = stringBuilder.toString();
        return string;
    }
}

3.响应加密

将返给前端的响应加密，保证数据的安全性

package com.linkus.common.filter;
import com.alibaba.fastjson.JSON;
import com.linkus.common.utils.Aes;
import com.linkus.common.utils.DesUtil;
import com.linkus.common.utils.http.HttpHelper;
import io.swagger.models.auth.In;
import lombok.experimental.Helper;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
 * 请求参数 加密操作
 *
 * @Author: Java碎碎念
 * @Date: 2019/10/24 21:31
 *
 */
@Component
@ControllerAdvice(basePackages = {"com.linkus.project"})
@Slf4j
public class EncryResponseBodyAdvice implements ResponseBodyAdvice<Object> {
    Logger log = LoggerFactory.getLogger(getClass());
    Aes aes=new Aes();
    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object obj, MethodParameter returnType, MediaType selectedContentType,
                                  Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest serverHttpRequest,
                                  ServerHttpResponse serverHttpResponse) {
        String returnStr = "";
        Object retObj = null;
        log.info("接口请求地址{}",serverHttpRequest.getURI());
        //日志过滤
        //retObj=infofilter.getInfoFilter(returnType,obj);
        if(HttpHelper.isEncrypted(serverHttpRequest.getHeaders())) {
            try {
                //添加encry header，告诉前端数据已加密
                //serverHttpResponse.getHeaders().add("infoe", "e=a");
                //获取请求数据
                String srcData = JSON.toJSONString(obj);
                //加密
                returnStr = aes.encrypt(srcData).replace("\r\n", "");
                //log.info("原始数据={},加密后数据={}", obj, returnStr);
                return returnStr;
            } catch (Exception e) {
                log.error("异常！", e);
            }
        }
        log.info("原始数据={}",JSON.toJSONString(obj));
        return obj;
    }
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我们。