springboot http status code and unified return status code

Generally, the api interface returned to the front end is unified

 

But if the front-end operation is wrong, the back-end return code is 400, and the http status code is still 200.

How to achieve uniform return code is 400?

Especially for front-end projects for SSR.

Solution: Use the interceptor ResponseBodyAdvice to achieve unified interception

Spring opens the ResponseBodyAdvice interface to allow interception and access to ResponseBody .
Function of the method:
supports: Specify whether to intercept
beforeBodyWrite: Execute the interception logic 

package com.xxx.common;


/**
 * 响应http状态码统一修改
 */

@ControllerAdvice
public class HttpStatusCodeAdvice implements ResponseBodyAdvice {

    /**
     * 指定是否进行拦截
     * @param returnType
     * @param converterType
     * @return
     */
    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return returnType.getParameterType().isAssignableFrom(ApiRestResponse.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        //取出后端响应结果 修改http状态码
        if(body != null) {
            int code = (int) ((ApiRestResponse) body).getCode();
            response.setStatusCode(HttpStatus.valueOf(code));
        }
        return body;
    }
}

 Refer to this post:

Unified modification of springboot response status code_springboot status code_bottom CEO's blog-CSDN blog