Spring Boot默认的JSON解析框架设置

方案一：启动类继承WebMvcConfigurerAdapter,覆盖方法configureMessageConverters

...
@SpringBootApplication
public class UserApplication extends WebMvcConfigurerAdapter{

  @Override
  public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    super.configureMessageConverters(converters);

    // 初始化转换器
    FastJsonHttpMessageConverter fastConvert = new FastJsonHttpMessageConverter();
    // 初始化一个转换器配置
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
 //用于美化格式，可注释掉   fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
    // 将配置设置给转换器并添加到HttpMessageConverter转换器列表中
    fastConvert.setFastJsonConfig(fastJsonConfig);

    converters.add(fastConvert);
  }

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

方案二：在启动类中注入 HttpMessageConverters

...
@SpringBootApplication
public class UserApplication {
    /**
     * 配置FastJson为Spring Boot默认JSON解析框架
     * @return  HttpMessageConverters
     */
    @Bean
    public HttpMessageConverters fastJsonHttpMessageConverters() {
        // 1.定义一个converters转换消息的对象
        FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
        // 2.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);
        // 3.在converter中添加配置信息
        fastConverter.setFastJsonConfig(fastJsonConfig);
        // 4.将converter赋值给HttpMessageConverter
        HttpMessageConverter<?> converter = fastConverter;
        // 5.返回HttpMessageConverters对象
        return new HttpMessageConverters(converter);
    }
    public static void main(String[] args) {
        SpringApplication.run(UserApplication.class, args);
    }
}

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