fastjson SerializerFeature详解
发布时间：2020-12-16 19:32:48 所属栏目：百科 来源：网络整理
导读：依赖 dependency groupIdcom.alibaba/groupId artifactIdfastjson/artifactId version1.2.7/version /dependency SerializerFeature属性 名称 含义 备注 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
依赖 <dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.7</version>
</dependency>
SerializerFeature属性
示例准备
User类型：缺省get、set方法public class User {
private int id;
private String name;
private String add;
private String old;
}
Word类型：缺省get、set方法public class Word {
private String d;
private String e;
private String f;
private String a;
private int b;
private boolean c;
private Date date;
private Map<String,Object> map;
private List<User> list;
}
SerializerFeatureTest:测试类public class SerializerFeatureTest {
private static Word word;
private static void init() {
word = new Word();
word.setA("a");
word.setB(2);
word.setC(true);
word.setD("d");
word.setE("");
word.setF(null);
word.setDate(new Date());
List<User> list = new ArrayList<User>();
User user1 = new User();
user1.setId(1);
user1.setOld("11");
user1.setName("用户1");
user1.setAdd("北京");
User user2 = new User();
user2.setId(2);
user2.setOld("22");
user2.setName("用户2");
user2.setAdd("上海");
User user3 = new User();
user3.setId(3);
user3.setOld("33");
user3.setName("用户3");
user3.setAdd("广州");
list.add(user3);
list.add(user2);
list.add(null);
list.add(user1);
word.setList(list);
Map<String,Object> map = new HashedMap();
map.put("mapa","mapa");
map.put("mapo","mapo");
map.put("mapz","mapz");
map.put("user1",user1);
map.put("user3",user3);
map.put("user4",null);
map.put("list",list);
word.setMap(map);
}
public static void main(String[] args) {
init();
// useSingleQuotes();
// writeMapNullValue();
// useISO8601DateFormat();
// writeNullListAsEmpty();
// writeNullStringAsEmpty();
// sortField();
// prettyFormat();
// writeDateUseDateFormat();
// beanToArray();
showJsonBySelf();
}
/**
* 9:自定义
* 格式化输出
* 显示值为null的字段
* 将为null的字段值显示为""
* DisableCircularReferenceDetect:消除循环引用
*/
private static void showJsonBySelf() {
System.out.println(JSON.toJSONString(word));
System.out.println(JSON.toJSONString(word,SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue,SerializerFeature.WriteNullStringAsEmpty,SerializerFeature.DisableCircularReferenceDetect,SerializerFeature.WriteNullListAsEmpty));
}
/**
* 8:
* 将对象转为array输出
*/
private static void beanToArray() {
word.setMap(null);
word.setList(null);
System.out.println(JSON.toJSONString(word));
System.out.println(JSON.toJSONString(word,SerializerFeature.BeanToArray));
}
/**
* 7:
* WriteDateUseDateFormat:全局修改日期格式,默认为false。
*/
private static void writeDateUseDateFormat() {
word.setMap(null);
word.setList(null);
System.out.println(JSON.toJSONString(word));
JSON.DEFFAULT_DATE_FORMAT = "yyyy-MM-dd";
System.out.println(JSON.toJSONString(word,SerializerFeature.WriteDateUseDateFormat));
}
/**
* 6:
* PrettyFormat
*/
private static void prettyFormat() {
word.setMap(null);
word.setList(null);
System.out.println(JSON.toJSONString(word));
System.out.println(JSON.toJSONString(word,SerializerFeature.PrettyFormat));
}
/**
* SortField:按字段名称排序后输出。默认为false
* 这里使用的是fastjson：为了更好使用sort field martch优化算法提升parser的性能，fastjson序列化的时候，
* 缺省把SerializerFeature.SortField特性打开了。
* 反序列化的时候也缺省把SortFeidFastMatch的选项打开了。
* 这样，如果你用fastjson序列化的文本，输出的结果是按照fieldName排序输出的，parser时也能利用这个顺序进行优化读取。
* 这种情况下，parser能够获得非常好的性能。
*/
private static void sortField() {
System.out.println(JSON.toJSONString(word));
System.out.println(JSON.toJSONString(word,SerializerFeature.SortField));
}
/**
* 5:
* WriteNullStringAsEmpty:字符类型字段如果为null,输出为"",而非null
* 需要配合WriteMapNullValue使用，现将null输出
*/
private static void writeNullStringAsEmpty() {
word.setE(null);
System.out.println(JSONObject.toJSONString(word));
System.out.println("设置WriteMapNullValue后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.WriteMapNullValue));
System.out.println("设置WriteMapNullValue、WriteNullStringAsEmpty后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.WriteNullStringAsEmpty));
}
/**
* 4:
* WriteNullListAsEmpty:List字段如果为null,而非null
* 需要配合WriteMapNullValue使用，现将null输出
*/
private static void writeNullListAsEmpty() {
word.setList(null);
System.out.println(JSONObject.toJSONString(word));
System.out.println("设置WriteNullListAsEmpty后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.WriteNullListAsEmpty));
}
/**
* 3:
* UseISO8601DateFormat:Date使用ISO8601格式输出，默认为false
*/
private static void useISO8601DateFormat() {
System.out.println(JSONObject.toJSONString(word));
System.out.println("设置UseISO8601DateFormat后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.UseISO8601DateFormat));
}
/**
* 2:
* WriteMapNullValue:是否输出值为null的字段,默认为false
*/
private static void writeMapNullValue() {
System.out.println(JSONObject.toJSONString(word));
System.out.println("设置WriteMapNullValue后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.WriteMapNullValue));
}
/**
* 1:
* UseSingleQuotes:使用单引号而不是双引号,默认为false
*/
private static void useSingleQuotes() {
System.out.println(JSONObject.toJSONString(word));
System.out.println("设置useSingleQuotes后：");
System.out.println(JSONObject.toJSONString(word,SerializerFeature.UseSingleQuotes));
}
}
对应输出结果如下：
{"a":"a","b":2,"c":true,"d":"d","date":1473839656840,"e":"","list":[{"add":"广州","id":3,"name":"用户3","old":"33"},{"add":"上海","id":2,"name":"用户2","old":"22"},null,{"add":"北京","id":1,"name":"用户1","old":"11"}],"map":{"list":[{"$ref":"$.list[0]"},{"$ref":"$.list[1]"},{"$ref":"$.list[3]"}],"user3":{"$ref":"$.list[0]"},"mapz":"mapz","mapo":"mapo","mapa":"mapa","user1":{"$ref":"$.list[3]"}}}
{
"a":"a","f":"","list":[
{
"add":"广州","old":"33"
},{
"add":"上海","old":"22"
},{
"add":"北京","old":"11"
}
],"map":{
"list":[
{
"add":"广州","old":"33"
},{
"add":"上海","old":"22"
},{
"add":"北京","old":"11"
}
],"user4":null,"user3":{
"add":"广州","user1":{
"add":"北京","old":"11"
}
}
}
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