Spring Boot 2 - configure Fastjson as default JSON library (Jackson replacement)

<!-- ... -->

​

<dependencies>

  <!-- ... -->

  <dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-web</artifactId>

    <exclusions>

      <exclusion>                                          <!-- ADD IT -->

        <groupId>com.fasterxml.jackson.core</groupId>      <!-- ADD IT -->

        <artifactId>jackson-core</artifactId>              <!-- ADD IT -->

      </exclusion>                                         <!-- ADD IT -->

      <exclusion>                                          <!-- ADD IT -->

        <groupId>com.fasterxml.jackson.core</groupId>      <!-- ADD IT -->

        <artifactId>jackson-databind</artifactId>          <!-- ADD IT -->

      </exclusion>                                         <!-- ADD IT -->

      <exclusion>                                          <!-- ADD IT -->

        <groupId>com.fasterxml.jackson.core</groupId>      <!-- ADD IT -->

        <artifactId>jackson-annotations</artifactId>       <!-- ADD IT -->

      </exclusion>                                         <!-- ADD IT -->

    </exclusions>

  </dependency>

  <!-- ... -->

  <!-- https://mvnrepository.com/artifact/com.alibaba.fastjson2/fastjson2 -->

  <dependency>                                             <!-- ADD IT -->

    <groupId>com.alibaba.fastjson2</groupId>               <!-- ADD IT -->

    <artifactId>fastjson2</artifactId>                     <!-- ADD IT -->

    <version>2.0.51</version>                              <!-- ADD IT -->

  </dependency>                                            <!-- ADD IT -->

  <!-- https://mvnrepository.com/artifact/com.alibaba.fastjson2/fastjson2-extension-spring6 -->

  <dependency>                                             <!-- ADD IT -->

    <groupId>com.alibaba.fastjson2</groupId>               <!-- ADD IT -->

    <artifactId>fastjson2-extension-spring6</artifactId>   <!-- ADD IT -->

    <version>2.0.51</version>                              <!-- ADD IT -->

  </dependency>                                            <!-- ADD IT -->

  <!-- ... -->

<dependencies>

​

<!-- ... -->

package com.example.config;

​

import java.nio.charset.StandardCharsets;

import java.util.Arrays;

import java.util.List;

​

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.http.MediaType;

import org.springframework.http.converter.HttpMessageConverter;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

​

import com.alibaba.fastjson2.support.config.FastJsonConfig;

import com.alibaba.fastjson2.support.spring6.http.converter.FastJsonHttpMessageConverter;

​

@Configuration

public class JsonMapperConfig implements WebMvcConfigurer {

​

    @Bean

    public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {

        var config = new FastJsonConfig();

        config.setCharset(StandardCharsets.UTF_8);

        var converter = new FastJsonHttpMessageConverter();

        converter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON));

        converter.setFastJsonConfig(config);

        return converter;

    }

​

    @Override

    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        converters.add(this.fastJsonHttpMessageConverter());

    }

}

// import com.alibaba.fastjson2.JSON;

​

SomeClass object = ...

String json = JSON.toJSONString(object);

// import com.alibaba.fastjson2.JSON;

​

String json = ...;

SomeClass object = JSON.parseObject(json, SomeClass.class);