业务场景：后端项目中分为PC端和移动端接口，移动端为例如 mobile 开头的URl，需求为调用移动端接口时，对返回数据进行加密，PC端不加密

import cn.hutool.core.date.DatePattern;
import cn.hutool.json.JSONConfig;
import cn.hutool.json.JSONObject;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Slf4j
@ControllerAdvice
public class ResultEncipher implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter methodParameter, Class aClass) {
        return true;
    }

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

        RequestAttributes ra = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes sra = (ServletRequestAttributes) ra;
        HttpServletRequest httpServletRequest = sra.getRequest();
        String url = httpServletRequest.getRequestURL().toString();
        log.info("------------------------------------------------------");
        log.info(url);
        log.info("------------------------------------------------------");
        JSONConfig jsonConfig = new JSONConfig();
        jsonConfig.setDateFormat(DatePattern.NORM_DATETIME_PATTERN);
        JSONObject jsonObject = new JSONObject(body, jsonConfig);
        String request = jsonObject.toString();
        List<String> requestList = new ArrayList<>();
        try {
            if (url.contains("phones")) {
                log.info("phones URL 开始加密");
                ObjectMapper objectMapper = new ObjectMapper();
                String result = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(body);
                log.info(result);

                String point = "xxx";
                //生成公钥和私钥
                Map<String, String> keyMap = new HashMap<>();//genKeyPair();
                keyMap.put("publicKey", "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDOUDwJVY1JMY4oSHM1+VKeYZ5T2LjQ4wvENnt0TlRoOYDrUen4Nm3GbVKiGTot76gu7xYL1X9PQvDnYLpUVu0mA2oLrXWZj2ByTW83Ehdc5Y9aLXtNzmm4e6PXtuEtXk2sqUZz+XtBBAUMAne4J9G9DAZVPLFxUUJyzVb9cnK6NQIDAQAB");
                keyMap.put("privateKey", "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");
                String publicKey = keyMap.get("publicKey");
                String privateKey = keyMap.get("privateKey");
                System.out.println(publicKey);
                System.out.println(privateKey);
                log.info("后端返回参数：" + request);
                requestList = RSAEncrypt.publicKeyEncryptBigStr(request, publicKey, point);
            } else {
                return body;
            }
        } catch (Exception e) {
            e.printStackTrace();
            log.error("对方法method :【" + methodParameter.getMethod().getName() + "】返回数据进行解密出现异常：" + e.getMessage());
            return requestList;
        }
        return requestList;
    }
}

加密相关在以下博文，复制即可使用

RSA 加密解密，中文不乱码-CSDN博客文章浏览阅读520次，点赞14次，收藏6次。RSA 加密 ，解密， 解决中文乱码，解决加密数据过长问题，循环加密，及中文乱码分析https://blog.csdn.net/qq_37739437/article/details/135741460?spm=1001.2014.3001.5501