fastjson的SerializerFeature

本文主要是介绍fastjson的SerializerFeature，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

0X00

先来一下SerializerFeature的源码吧。

/** Copyright 1999-2101 Alibaba Group.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package com.alibaba.fastjson.serializer;/*** @author wenshao<szujobs@hotmail.com>*/
public enum SerializerFeature {QuoteFieldNames,//输出key时是否使用双引号,默认为true /*** */UseSingleQuotes,//使用单引号而不是双引号,默认为false/*** */WriteMapNullValue,//是否输出值为null的字段,默认为false /*** */WriteEnumUsingToString,//Enum输出name()或者original,默认为false/*** */UseISO8601DateFormat,//Date使用ISO8601格式输出，默认为false/*** @since 1.1*/WriteNullListAsEmpty,//List字段如果为null,输出为[],而非null /*** @since 1.1*/WriteNullStringAsEmpty,//字符类型字段如果为null,输出为"",而非null /*** @since 1.1*/WriteNullNumberAsZero,//数值字段如果为null,输出为0,而非null /*** @since 1.1*/WriteNullBooleanAsFalse,//Boolean字段如果为null,输出为false,而非null/*** @since 1.1*/SkipTransientField,//如果是true，类中的Get方法对应的Field是transient，序列化时将会被忽略。默认为true/*** @since 1.1*/SortField,//按字段名称排序后输出。默认为false/*** @since 1.1.1*/@DeprecatedWriteTabAsSpecial,//把\t做转义输出，默认为false/*** @since 1.1.2*/PrettyFormat,//结果是否格式化,默认为false/*** @since 1.1.2*/WriteClassName,//序列化时写入类型信息，默认为false。反序列化是需用到/*** @since 1.1.6*/DisableCircularReferenceDetect,//消除对同一对象循环引用的问题，默认为false/*** @since 1.1.9*/WriteSlashAsSpecial,//对斜杠'/'进行转义/*** @since 1.1.10*/BrowserCompatible,//将中文都会序列化为\uXXXX格式，字节数会多一些，但是能兼容IE 6，默认为false/*** @since 1.1.14*/WriteDateUseDateFormat,//全局修改日期格式,默认为false。JSON.DEFFAULT_DATE_FORMAT = "yyyy-MM-dd";JSON.toJSONString(obj, SerializerFeature.WriteDateUseDateFormat);/*** @since 1.1.15*/NotWriteRootClassName,//暂不知，求告知/*** @since 1.1.19*/DisableCheckSpecialChar,//一个对象的字符串属性中如果有特殊字符如双引号，将会在转成json时带有反斜杠转移符。如果不需要转义，可以使用这个属性。默认为false /*** @since 1.1.35*/BeanToArray //暂不知，求告知;private SerializerFeature(){mask = (1 << ordinal());}private final int mask;public final int getMask() {return mask;}public static boolean isEnabled(int features, SerializerFeature feature) {return (features & feature.getMask()) != 0;}public static int config(int features, SerializerFeature feature, boolean state) {if (state) {features |= feature.getMask();} else {features &= ~feature.getMask();}return features;}
}

0X01

大致用法

先来张图(图是盗的，链接在参考3)：

简单的代码示例

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;private static SerializerFeature[] features = {SerializerFeature.WriteNullNumberAsZero,SerializerFeature.WriteNullStringAsEmpty,SerializerFeature.DisableCircularReferenceDetect };JSONObject result = new JSONObject(); 
result.put("errorCode", 1);
result.put("errorMessage", cause);//Map<String, String> cause
JSON.toJSONString(result, features);