Spring-boot替换框架json为fastjson

第一步: pom.xml 中删除默认的 jackson

<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-webartifactId>
    <exclusions>
        <exclusion>
            <groupId>com.fasterxml.jackson.coregroupId>
            <artifactId>jackson-databindartifactId>
        exclusion>
    exclusions>
dependency>

第二步: pom.xml 中引用fastjson

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>fastjsonartifactId>
    <version>1.2.45version>
dependency>

第三步: 启动类中配置

@SpringBootApplication  //申明让spring boot自动给程序进行必要的配置
public class AppStart extends WebMvcConfigurerAdapter {

    public static void main(String[] args) {
        SpringApplication.run(AppStart.class, args);
    }

    /**
     * 替换框架json为fastjson
     */
    @Override
    public void configureMessageConverters(List> converters) {
        super.configureMessageConverters(converters);
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat, 
                SerializerFeature.WriteMapNullValue,
                SerializerFeature.WriteNullNumberAsZero, 
                SerializerFeature.WriteNullStringAsEmpty
            );
        // 处理中文乱码问题
        List fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastConverter.setSupportedMediaTypes(fastMediaTypes);
        fastConverter.setFastJsonConfig(fastJsonConfig);

        //处理字符串, 避免直接返回字符串的时候被添加了引号
        StringHttpMessageConverter smc = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        converters.add(smc);

        converters.add(fastConverter);
    }
}