域名备案网站备案,wordpress4.9.8下载,六安头条网,wordpress文章字体样式1. 背景
在部分使用场景#xff08;如元数据驱动#xff0c;后台接口仅返回序列化后的json字符串#xff0c;前端需要根据每个字段在前端呈现#xff09;#xff0c;需要手动设置字段的长度。通常情况下#xff0c;框架是有默认的顺序#xff0c;如 jackson 默认使用字…1. 背景
在部分使用场景如元数据驱动后台接口仅返回序列化后的json字符串前端需要根据每个字段在前端呈现需要手动设置字段的长度。通常情况下框架是有默认的顺序如 jackson 默认使用字段声明的顺序 fastjson 默认是使用字典序。在这种业务场景下就需要我们可以手动指定序列化后字段的顺序。
这里分别使用 jackson 和 fastjson 两种框架。
2. 使用 jackson
使用注解 JsonPropertyOrder 声明具体的字段顺序。如 JsonPropertyOrder({city, age, name}) 。具体参考实例程序。
pom依赖
dependencygroupIdcom.fasterxml.jackson.core/groupIdartifactIdjackson-databind/artifactIdversion2.14.3/version
/dependencyJava 验证程序
package com.ysx.utils.json.jackson;import com.fasterxml.jackson.annotation.JsonPropertyOrder;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Getter;
import lombok.Setter;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;/*** author youngbear* email youngbearaliyun.com* date 2023-10-15 22:15* blog a hrefhttps://blog.csdn.net/next_second.../a* github a hrefhttps://github.com/YoungBear.../a* description*/
DisplayName(使用jackson设置序列化时字段的顺序)
public class JsonFieldOrderTest {TestDisplayName(默认顺序:字段声明的顺序)public void defaultOrderTest() throws JsonProcessingException {Student1 student new Student1();student.setName(John);student.setAge(25);student.setCity(Beijing);ObjectMapper objectMapper new ObjectMapper();String json objectMapper.writeValueAsString(student);// {name:John,age:25,city:Beijing}Assertions.assertEquals({\name\:\John\,\age\:25,\city\:\Beijing\}, json);}TestDisplayName(使用JsonPropertyOrder指定顺序)public void userJsonPropertyOrderTest() throws JsonProcessingException {Student2 student new Student2();student.setName(John);student.setAge(25);student.setCity(Beijing);ObjectMapper objectMapper new ObjectMapper();String json objectMapper.writeValueAsString(student);// {city:Beijing,age:25,name:John}Assertions.assertEquals({\city\:\Beijing\,\age\:25,\name\:\John\}, json);}GetterSetterpublic static class Student1 {private String name;private Integer age;private String city;}GetterSetterJsonPropertyOrder({city, age, name})public static class Student2 {private String name;private Integer age;private String city;}
}
3. 使用 fastjson
有两种方法
使用 JsonField 的 ordinal 指定顺序数越小优先级越高默认为0。使用JSONType的orders属性指定字段顺序
详细参考实例程序
pom依赖
!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --
dependencygroupIdcom.alibaba/groupIdartifactIdfastjson/artifactIdversion2.0.41/version
/dependency程序
package com.ysx.utils.json.fastjson;import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.annotation.JSONField;
import com.alibaba.fastjson2.annotation.JSONType;
import lombok.Getter;
import lombok.Setter;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;/*** author youngbear* email youngbearaliyun.com* date 2023-10-15 21:28* blog a hrefhttps://blog.csdn.net/next_second.../a* github a hrefhttps://github.com/YoungBear.../a* description*/
DisplayName(使用fastjson设置序列化时字段的顺序)
public class JsonFieldOrderTest {TestDisplayName(默认顺序:字典序)public void defaultOrderTest() {Student1 student new Student1();student.setName(John);student.setAge(25);student.setCity(Beijing);String json JSON.toJSONString(student);// {age:25,city:Beijing,name:John}Assertions.assertEquals({\age\:25,\city\:\Beijing\,\name\:\John\}, json);}TestDisplayName(使用JsonField的ordinal指定顺序数越小优先级越高默认为0)public void userJsonFieldOrdinalTest() {Student2 student new Student2();student.setName(John);student.setAge(25);student.setCity(Beijing);String json JSON.toJSONString(student);// {name:John,age:25,city:Beijing}Assertions.assertEquals({\name\:\John\,\age\:25,\city\:\Beijing\}, json);}TestDisplayName(使用JSONType的orders属性指定字段顺序)public void userJsonPropertyOrderTest() {Student3 student new Student3();student.setName(John);student.setAge(25);student.setCity(Beijing);String json JSON.toJSONString(student);// {name:John,age:25,city:Beijing}Assertions.assertEquals({\name\:\John\,\age\:25,\city\:\Beijing\}, json);}GetterSetterpublic static class Student1 {private String name;private Integer age;private String city;}GetterSetterpublic static class Student2 {JSONField(ordinal 1)private String name;JSONField(ordinal 2)private Integer age;JSONField(ordinal 3)private String city;}GetterSetterJSONType(orders {name, age, city})public static class Student3 {private String name;private Integer age;private String city;}
}
源代码github地址
