JSON.toJSONString

fastjson

# java code 

 JSON.toJSONString(demoBean,
                SerializerFeature.PrettyFormat,
                SerializerFeature.WriteNonStringKeyAsString,
                SerializerFeature.WriteNullNumberAsZero,
                SerializerFeature.WriteNullListAsEmpty,
                SerializerFeature.WriteNullStringAsEmpty,
                SerializerFeature.WriteNullBooleanAsFalse);

// output 
{
    "department":"",
    "isDelete":false,
    "list":[],
    "map":{"1":"ddd"},
    "name":""
}