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springboot笔记示例六：fastjson2集成

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springboot笔记示例六：fastjson2集成

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#springboot json官方说明

https://docs.spring.io/spring-boot/docs/2.1.6.RELEASE/reference/html/boot-features-json.html

spring Boot 提供与三个 JSON 映射库的集成：

Gson
Jackson
JSON-B

springboot 默认库为：Jackson

 <!-- springboot-json --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-json</artifactId></dependency>

yml配置自定义序列化格式

spring:jackson:# @JsonFormat 日期格式和时区配置date-format: yyyy-MM-dd HH:mm:sstime-zone: GMT+8property-naming-strategy: SNAKE_CASE

阿里巴巴FastJson2集成

spring5.x

<dependency><groupId>com.alibaba.fastjson2</groupId><artifactId>fastjson2</artifactId><version>2.0.43</version>
</dependency>
<dependency><groupId>com.alibaba.fastjson2</groupId><artifactId>fastjson2-extension-spring5</artifactId><version>2.0.43</version>
</dependency>

package com.brm.config;import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.support.config.FastJsonConfig;
import com.alibaba.fastjson2.support.spring.http.converter.FastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;@Configuration
public class FastjsonConfiguration {@Beanpublic HttpMessageConverters fastJsonConfigure() {FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();FastJsonConfig fastJsonConfig = new FastJsonConfig();//fastjson2 默认格式为yyyy-MM-dd HH:mm 无需重新设置fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");//fastjson2 默认StandardCharsets.UTF_8 无需重新设置
//        fastJsonConfig.setCharset(StandardCharsets.UTF_8);fastJsonConfig.setReaderFeatures(//字段如 vBtn  会被转为 VBtn  处理这样的问题JSONReader.Feature.SupportSmartMatch,JSONReader.Feature.FieldBased,//初始化String字段为空字符串""
//                JSONReader.Feature.InitStringFieldAsEmpty,//对读取到的字符串值做trim处理JSONReader.Feature.TrimString);fastJsonConfig.setWriterFeatures(//字段如 vBtn  会被转为 VBtn  处理这样的问题JSONWriter.Feature.FieldBased,//long 转 string 丢失精度问题JSONWriter.Feature.WriteLongAsString,// 保留map空的字段JSONWriter.Feature.WriteMapNullValue,//将List类型的null转成[]JSONWriter.Feature.WriteNullListAsEmpty,//将String类型的null转成""JSONWriter.Feature.WriteNullStringAsEmpty,//将Boolean类型的null转成false
//                JSONWriter.Feature.WriteNullBooleanAsFalse,//日期格式转换JSONWriter.Feature.PrettyFormat//将空置输出为缺省值，Number类型的null都输出为0，String类型的null输出为""，数组和Collection类型的输出为[]
//                JSONWriter.Feature.NullAsDefaultValue);fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);List<MediaType> supportedMediaTypes = new ArrayList<>();supportedMediaTypes.add(MediaType.APPLICATION_JSON);
//        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);supportedMediaTypes.add(MediaType.APPLICATION_ATOM_XML);supportedMediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);supportedMediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);supportedMediaTypes.add(MediaType.APPLICATION_PDF);supportedMediaTypes.add(MediaType.APPLICATION_RSS_XML);supportedMediaTypes.add(MediaType.APPLICATION_XHTML_XML);supportedMediaTypes.add(MediaType.APPLICATION_XML);supportedMediaTypes.add(MediaType.IMAGE_GIF);supportedMediaTypes.add(MediaType.IMAGE_JPEG);supportedMediaTypes.add(MediaType.IMAGE_PNG);supportedMediaTypes.add(MediaType.TEXT_EVENT_STREAM);supportedMediaTypes.add(MediaType.TEXT_HTML);supportedMediaTypes.add(MediaType.TEXT_MARKDOWN);supportedMediaTypes.add(MediaType.TEXT_PLAIN);supportedMediaTypes.add(MediaType.TEXT_XML);fastJsonHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes);fastJsonHttpMessageConverter.setDefaultCharset(StandardCharsets.UTF_8);return new HttpMessageConverters(fastJsonHttpMessageConverter);}
}