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参考文档：https://blog.csdn.net/zhuocailing3390/article/details/125054315

解决思路：

1. 通过实现RequestBodyAdvice接口，对前端请求的参数进行解密并且重新让真实结构的数据进入到Controller中；
2. 通过实现ResponseBodyAdvice接口，将响应的参数进行加密，返回到前端；

扩展：可以通过自定义注解，实现对指定接口的请求响应数据加解密

demo

请求数据解密

1. 添加注解（这里的注解为排除接口加解密的注解）

import java.lang.annotation.*;

/**
 * 请求加密、响应解密标识
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface HttpDataDecrypt {
}

1. 添加处理类，通过实现RequestBodyAdvice接口，对符合要求的请求解密

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.chinaunicom.common.annotation.ExcludeHttpDataDecrypt;
import com.chinaunicom.common.annotation.HttpSvsSign;
import com.chinaunicom.common.entity.response.CommonCode;
import com.chinaunicom.common.exception.BizException;
import com.chinaunicom.common.util.Sm2Utils;
import com.chinaunicom.common.util.gmgz.GMGZComponent;
import com.chinaunicom.common.util.gmgz.GMGZResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.MethodParameter;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;

import javax.annotation.Nullable;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Type;
import java.nio.charset.StandardCharsets;

@RestControllerAdvice
public class GlobalRequestBodyAdvice implements RequestBodyAdvice {

    @Value("${sm2.httpData.switch}")
    private boolean SM2Switch;
    @Value("${sm2.httpData.request.privateKey}")
    private String SM2ReqPriKey;
    @Autowired
    private GMGZComponent gmgzComponent;

    /**
     * 该方法用于判断当前请求，是否要执行beforeBodyRead方法  目前所有加HttpBodyDecrypt注解的类或者接口都会做加解密处理
     * methodParameter方法的参数对象
     * type方法的参数类型
     * aClass 将会使用到的Http消息转换器类类型
     * 注意：此判断方法，会在beforeBodyRead 和 afterBodyRead方法前都触发一次。
     *
     * @return 返回true则会执行beforeBodyRead,即请求数据解密
     */
    @Override
    public boolean supports(MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {

        //请求、响应加解密注解
        //判断类上是否有指定注解
        boolean methodHasHttpBodyDecrypt = methodParameter.hasMethodAnnotation(HttpBodyDecrypt.class);
        if (methodHasHttpBodyDecrypt) {
            return true;
        }
        //判断方法上是否有指定注解
        boolean classHasHttpBodyDecrypt = methodParameter.getDeclaringClass().getAnnotation(HttpBodyDecrypt.class) != null;
        if (classHasHttpBodyDecrypt) {
            return true;
        }
        return true;
    }

    /**
     * 在Http消息转换器执转换，之前执行
     * inputMessage 客户端的请求数据
     * parameter方法的参数对象
     * targetType方法的参数类型
     * converterType 将会使用到的Http消息转换器类类型
     * @return 返回 一个自定义的HttpInputMessage
     */
    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
        if (inputMessage.getBody().available()<=0) {
            return inputMessage;
        }
        byte[] requestDataByte=new byte[inputMessage.getBody().available()];
        inputMessage.getBody().read(requestDataByte);
        byte[] requestDataByteNew=null;
        try {
            // 解密具体实现
            requestDataByteNew  = this.decryptHandler(requestDataByte);
        } catch (Exception e) {
            throw e;
        }
        // 使用解密后的数据，构造新的读取流
        InputStream rawInputStream = new ByteArrayInputStream(requestDataByteNew);
        return new HttpInputMessage() {
            @Override
            public HttpHeaders getHeaders() {
                return inputMessage.getHeaders();
            }

            @Override
            public InputStream getBody() throws IOException {
                return rawInputStream;
            }
        };
    }

    /**
     * 在Http消息转换器执转换，之后执行
     * body 转换后的对象
     * inputMessage 客户端的请求数据
     * parameter handler方法的参数类型
     * targetType handler方法的参数类型
     * converterType 使用的Http消息转换器类类型
     * @return 返回一个新的对象
     */
    @Override
    public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return body;
    }

    /**
     * 参数与afterBodyRead相同，不过这个方法处理的是，body为空的情况
     */
    @Override
    public Object handleEmptyBody(@Nullable Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return body;
    }

    /**
     * 解密处理
     * @param requestBytes
     * @return
     */
    public byte[] decryptHandler(byte[] requestBytes) throws UnsupportedEncodingException {
        if (requestBytes.length <= 0) {
            return new byte[0];
        }
        String requestData = new String(requestBytes, StandardCharsets.UTF_8);
        String decrypt = null;
        try {
            JSONObject jsonobj = JSON.parseObject(requestData);
            //前端将解密结果放在：data字段中，如{"data": "加密结果"}
            String encrypt= jsonobj.get("data")==null?"":jsonobj.get("data").toString();

            //解密处理
            decrypt = Sm2Utils.decryptHttp(SM2ReqPriKey,encrypt);
        } catch (Exception e) {
            throw new BizException(CommonCode.REQUEST_DATA_END_ERROR);
        }
        //验证通过，返回解密后的参数
        return decrypt.getBytes(StandardCharsets.UTF_8);
    }
}

响应加密：

package com.chinaunicom.common.advice;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.ToStringSerializer;
import com.chinaunicom.common.annotation.ExcludeHttpDataDecrypt;
import com.chinaunicom.common.entity.response.CommonCode;
import com.chinaunicom.common.exception.BizException;
import com.chinaunicom.common.util.Sm2Utils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.MethodParameter;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.math.BigInteger;

@RestControllerAdvice(basePackages={"com.chinaunicom.api.controller","com.chinaunicom.admin.controller"})
@Order(Integer.MAX_VALUE-20)
public class GlobalResponseBodyAdvice  implements ResponseBodyAdvice {
    @Value("${sm2.httpData.switch}")
    private boolean SM2Switch;
    @Value("${sm2.httpData.response.publicKey}")
    private String SM2RespPubKey;
    @Override
    public boolean supports(MethodParameter methodParameter, Class aClass) {
        if(!SM2Switch){
            return false;
        }
        //排除解密注解
        boolean methodHasExcludeHttpBodyDecrypt = methodParameter.hasMethodAnnotation(ExcludeHttpDataDecrypt.class);
        if (methodHasExcludeHttpBodyDecrypt) {
            return false;
        }
        boolean classHasExcludeHttpBodyDecrypt = methodParameter.getDeclaringClass().getAnnotation(ExcludeHttpDataDecrypt.class) != null;
        if (classHasExcludeHttpBodyDecrypt) {
            return false;
        }
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter methodParameter, MediaType mediaType, Class aClass, ServerHttpRequest request, ServerHttpResponse response) {

        try {
//            HttpHeaders headers = serverHttpRequest.getHeaders();
            String result = null;
            Class<?> dataClass = body.getClass();
            if (dataClass.isPrimitive() || (body instanceof String)) {
                result = String.valueOf(body);
            } else {
                SerializeConfig serializeConfig = SerializeConfig.globalInstance;
                serializeConfig.put(BigInteger.class, ToStringSerializer.instance);
                serializeConfig.put(Long.class, ToStringSerializer.instance);
                result = JSON.toJSONString(body, serializeConfig, SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteDateUseDateFormat, SerializerFeature.WriteMapNullValue);
            }

            // 设置响应的加密key,用于前端解密
//            response.getHeaders().add(EncryptionHandler.ENCRYPT_KEY, key);
            // 对数据加密返回
            return Sm2Utils.encryptHttp(SM2RespPubKey,result);
        } catch (Exception e) {
            e.printStackTrace();
            throw new BizException(CommonCode.RESPONSE_DATA_END_ERROR);
        }
    }
}