SpringBoot中MVC的自动配置详解

public class MvcModel {
    private String modelName;
    private Integer modelType;
    /**省略geter、setter方法**/
}
@RestController
@EnableAutoConfiguration
public class SpringMvcGuide {
    @RequestMapping("/getModel")
    public MvcModel getMvcModel(){
        MvcModel mvcModel = new MvcModel();
        mvcModel.setModelName("小明");
        mvcModel.setModelType(1);
        return mvcModel;
    }
    public static void main(String[] args){
        SpringApplication.run(SpringMvcGuide.class,args);
    }
}

compile 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.11.2'
compile 'org.glassfish.jaxb:jaxb-runtime:2.3.3'

@XmlRootElement
public class MvcModel {
    private String modelName;
    private Integer modelType;
    /**省略geter、setter方法**/
}

@RestController
@SpringBootApplication
public class SpringMvcGuide {
    @RequestMapping("/getStudent")
    public Student getStudent(){
        Student stu = new Student();
        stu.setName("小明");
        return stu;
    }
    public static void main(String[] args){
        SpringApplication.run(SpringMvcGuide.class,args);
    }
}

public class Student {
    private String name;
    private int age;
    private String address;
    /** 省略getter、setter方法 **/
}

compile 'com.alibaba:fastjson:1.2.58'

@Configuration
public class HttpMessageConverterConfig {
    @Bean
    public HttpMessageConverter fastJsonHttpMessageConverter(){
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        SerializerFeature[] serializerFeatures = new SerializerFeature[]{
                SerializerFeature.QuoteFieldNames,//输出Key是否包含双引号
                SerializerFeature.WriteMapNullValue,//是否输出为null的字段，若为null则显示该字段
                SerializerFeature.WriteNullNumberAsZero,//数字若为null，输出0
                SerializerFeature.WriteNullListAsEmpty, //list为null，输出[]
                SerializerFeature.WriteNullStringAsEmpty,//String为null，输出""
                SerializerFeature.WriteNullBooleanAsFalse,//boolean为null，输出false
                SerializerFeature.WriteDateUseDateFormat,//Date的日期转换器
                SerializerFeature.DisableCircularReferenceDetect //循环引用
        };
        fastJsonConfig.setSerializerFeatures(serializerFeatures);
        fastJsonConfig.setCharset(Charset.forName("UTF-8"));
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        List<MediaType> mediaTypeList = new ArrayList<MediaType>();
        mediaTypeList.add(MediaType.APPLICATION_JSON);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(mediaTypeList);
        return fastJsonHttpMessageConverter;
    }
}

@JsonComponent
public class Example {
    public static class Serializer extends JsonSerializer<SomeObject> {
        // ...
    }
    public static class Deserializer extends JsonDeserializer<SomeObject> {
        // ...
    }
}

spring:
  mvc:
    static-path-pattern: "/resources/**"

@ControllerAdvice(basePackageClasses = AcmeController.class)
public class AcmeControllerAdvice extends ResponseEntityExceptionHandler {
    @ExceptionHandler(YourException.class)
    @ResponseBody
    ResponseEntity<?> handleControllerException(HttpServletRequest request, Throwable ex) {
        HttpStatus status = getStatus(request);
        return new ResponseEntity<>(new CustomErrorType(status.value(), ex.getMessage()), status);
    }
    private HttpStatus getStatus(HttpServletRequest request) {
        Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code");
        if (statusCode == null) {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        }
        return HttpStatus.valueOf(statusCode);
    }
}

public class MyErrorViewResolver implements ErrorViewResolver {
    @Override
    public ModelAndView resolveErrorView(HttpServletRequest request,
            HttpStatus status, Map<String, Object> model) {
        // Use the request or status to optionally return a ModelAndView
        return ...
    }
}

@Configuration(proxyBeanMethods = false)
public class MyConfiguration {
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/api/**");
            }
        };
    }
}