json与fastjson

1、若是对象中包含date类型，那么利用,将日期转成String，因为date直接转成date会错误，或者利用fastjson的JSON.toJSONString(dg),返回毫秒数

public class JsonDateValueProcessor implements JsonValueProcessor{
     private String pattern = "yyyy-MM-dd HH:mm:ss";  
      
        public Object processArrayValue(Object value, JsonConfig config) {  
            return process(value);  
        }  
      
        public Object processObjectValue(String key, Object value, JsonConfig config) {  
            return process(value);  
        }  
        private Object process(Object value){  
            if(value instanceof Date){  
                SimpleDateFormat sdf = new SimpleDateFormat(pattern, Locale.CHINA);  
                return sdf.format(value);  
            }  
            return value == null ? "" : value.toString();  
        }  
      
}

JsonConfig config = new JsonConfig();  
JsonDateValueProcessor jsonValueProcessor = new JsonDateValueProcessor();  
config.registerJsonValueProcessor(Date.class, jsonValueProcessor)
JSONObject json=JSONObject.fromObject(dg, config)