Spring-boot中使用fastjson作为json框架

第一步：
在pom文件中引入fastjson依赖

<dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.2.15</version></dependency>

配置fastjson（两种方法）
第一种方法：
（1）启动类继承extends WebMvcConfigurerAdapter
（2）覆盖方法configureMessageConverters

@SpringBootApplicationpublic class ApiCoreApp  extends WebMvcConfigurerAdapter {    @Override    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {        super.configureMessageConverters(converters);        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();        FastJsonConfig fastJsonConfig = new FastJsonConfig();        fastJsonConfig.setSerializerFeatures(                SerializerFeature.PrettyFormat        );        fastConverter.setFastJsonConfig(fastJsonConfig);        converters.add(fastConverter);    }}

第二种在启动类中注入Bean:HttpMessageConverters

@Bean    public HttpMessageConverters fastJsonHttpMessageConverters() {        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();        FastJsonConfig fastJsonConfig = new FastJsonConfig();        fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);        fastConverter.setFastJsonConfig(fastJsonConfig);        HttpMessageConverter<?> converter = fastConverter;        return new HttpMessageConverters(converter);    }