springboot配置fastjson

github地址：https://github.com/xuzhipeng1028/spring-boot-fastjson

1、引入fastjson依赖

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.79</version>
        </dependency>

2、自定义WebMvcConfigurer

package com.xzp.springboot.fastjson.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.ArrayList;
import java.util.List;

/**
 * 自定义WebMvcConfigurer
 * @author xuzhipeng
 * @date 2022/2/18
 */
@Configuration
public class CustomizedWebMvcConfigurer implements WebMvcConfigurer {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        //删除jackson的消息转换器
        converters.removeIf(item -> item instanceof MappingJackson2HttpMessageConverter);
        //定义一个converters转换消息的对象
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        //添加fastjson的配置信息，比如: 是否需要格式化返回的json数据
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
        //在converter中添加配置信息
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.valueOf(MediaType.APPLICATION_JSON_VALUE + ";charset=UTF-8"));
        fastJsonHttpMessageConverter.setSupportedMediaTypes(mediaTypes);
        //fastjson转换器必须放在StringHttpMessageConverter之后，不然接口返回值如果是字符串，会多加一对双引号
        converters.add(fastJsonHttpMessageConverter);
    }

}