1.加密

package springcloud.dataencode;

import cn.hutool.crypto.asymmetric.KeyType;
import cn.hutool.crypto.asymmetric.RSA;
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 com.alibaba.fastjson.JSON;
import springcloud.pojo.ABC;
import springcloud.util.Base64Utils;

import java.security.PrivateKey;
import java.security.PublicKey;


@Component
@ControllerAdvice(basePackages = "springcloud.controller")
public class EncodeResponseBodyAdvice implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        System.out.println("response-------->"+body);
        //加密
        System.out.println("准备加密的数据为"+body);
        String encode = Base64Utils.encode(JSON.toJSONString(body));
        return encode;
    }


    public static void main(String[] args) throws Exception {
        ABC abc1 = new ABC();
        abc1.setName("张三");
        abc1.setAge(1);
        abc1.setAddress("河南");
//        String encode = encode(JSON.toJSONString(abc1));
//        System.out.println(encode);
//        String decode = decode(encode);
//        ABC abc = JSON.parseObject(decode, ABC.class);
//        System.out.println(abc);


        RSA rsa = new RSA();

//获得私钥
        PrivateKey privateKey = rsa.getPrivateKey();
//获得公钥
        PublicKey publicKey = rsa.getPublicKey();

//公钥加密，私钥解密
        String s1 = JSON.toJSONString(abc1);
        byte[] encrypt = rsa.encrypt(s1, KeyType.PublicKey);
        byte[] decrypt = rsa.decrypt(encrypt, KeyType.PrivateKey);
        String s = new String(decrypt);
        ABC abc = JSON.parseObject(s, ABC.class);
        System.out.println("abc = " + abc);


    }
}

2. 解密

package aaa;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Type;

import org.springframework.core.MethodParameter;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpInputMessage;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.RequestBodyAdvice;
import springcloud.pojo.ABC;
import springcloud.util.Base64Utils;

@Component
@ControllerAdvice(basePackages = "springcloud.controller")
public class DecodeRequestBodyAdvice implements RequestBodyAdvice {

    @Override
    public boolean supports(MethodParameter methodParameter, Type targetType,
                            Class<? extends HttpMessageConverter<?>> converterType) {
        //这里设置成false 它就不会再走这个类了
        return true;
    }

    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage request, MethodParameter parameter, Type targetType, Class<? extends HttpMessageConverter<?>> converterType) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        try {
            //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
            InputStream inputStream = request.getBody();
            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("");
            }
        } catch (IOException ex) {
            throw ex;
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException ex) {
                    throw ex;
                }
            }
        }
        //获取请求数据
        String string = stringBuilder.toString();
        /*****************进行解密start*******************/
        System.out.println("请求的数据为:" + string);
        
        string=string.substring(string.indexOf(":")+2,string.indexOf("=")+1);

        String decode = Base64Utils.decode(string);
        System.out.println("【解密后的请求数据】decode=:" + decode);

        //把数据放到我们封装的对象中
        return new MyHttpInputMessage(request.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(Object body, HttpInputMessage inputMessage, MethodParameter parameter,
                                  Type targetType, Class<? extends HttpMessageConverter<?>> converterType) {
        return body;
    }

    //这里实现了HttpInputMessage 封装一个自己的HttpInputMessage
    static class MyHttpInputMessage implements HttpInputMessage {
        HttpHeaders headers;
        InputStream body;

        public MyHttpInputMessage(HttpHeaders headers, InputStream body) {
            this.headers = headers;
            this.body = body;
        }

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

        @Override
        public HttpHeaders getHeaders() {
            return headers;
        }
    }

}