返回Json对象不忽略null值SerializerFeature.WriteMapNullValue)

Fastjson的SerializerFeature序列化属性

QuoteFieldNames———-输出key时是否使用双引号,默认为true
WriteMapNullValue——–是否输出值为null的字段,默认为false
WriteNullNumberAsZero—-数值字段如果为null,输出为0,而非null
WriteNullListAsEmpty—–List字段如果为null,输出为[],而非null
WriteNullStringAsEmpty—字符类型字段如果为null,输出为”“,而非null
WriteNullBooleanAsFalse–Boolean字段如果为null,输出为false,而非null

package com.springsecuritydemo.util;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//Arbor 2022/9/29
public class WebUtils {
    /**
     * 渲染String页面
     * @param httpServletResponse
     * @param responseObject
     */
    public static void renderResponse(HttpServletResponse httpServletResponse, ResponseObject responseObject){
        httpServletResponse.setStatus(200);
        httpServletResponse.setContentType("application/json");
        httpServletResponse.setCharacterEncoding("utf-8");
        try {
            httpServletResponse.getWriter().print(JSONObject.toJSONString(responseObject, SerializerFeature.WriteMapNullValue));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}