Java超详细讲解WebMvcConfigurer拦截器

 /* 拦截器配置 */
void addInterceptors(InterceptorRegistry var1);
/* 视图跳转控制器 */
void addViewControllers(ViewControllerRegistry registry);
/**
  *静态资源处理
**/
void addResourceHandlers(ResourceHandlerRegistry registry);
/* 默认静态资源处理器 */
void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer);
/**
  *这里配置视图解析器
 **/
void configureViewResolvers(ViewResolverRegistry registry);
/* 配置内容裁决的一些选项*/
void configureContentNegotiation(ContentNegotiationConfigurer configurer);
/** 解决跨域问题 **/
public void addCorsMappings(CorsRegistry registry) ;

@Override
public void addInterceptors(InterceptorRegistry registry) {
    super.addInterceptors(registry);
    registry.addInterceptor(new TestInterceptor()).addPathPatterns("/**").excludePathPatterns("/emp/toLogin","/emp/login","/js/**","/css/**","/images/**");
}

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/toLogin").setViewName("login");
    }

@Configuration
public class MyWebMvcConfigurerAdapter implements WebMvcConfigurer {
    /**
     * 配置静态访问资源
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/my/**").addResourceLocations("classpath:/my/");
    }
}

/**
 * 配置请求视图映射
 * @return
 */
@Bean
public InternalResourceViewResolver resourceViewResolver()
{
    InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
    //请求视图文件的前缀地址
    internalResourceViewResolver.setPrefix("/WEB-INF/jsp/");
    //请求视图文件的后缀
    internalResourceViewResolver.setSuffix(".jsp");
    return internalResourceViewResolver;
}
/**
 * 视图配置
 * @param registry
 */
@Override
public void configureViewResolvers(ViewResolverRegistry registry) {
    super.configureViewResolvers(registry);
    registry.viewResolver(resourceViewResolver());
    /*registry.jsp("/WEB-INF/jsp/",".jsp");*/
}

@Override
public void addCorsMappings(CorsRegistry registry) {
    super.addCorsMappings(registry);
    registry.addMapping("/cors/**")
            .allowedHeaders("*")
            .allowedMethods("POST","GET")
            .allowedOrigins("*");
}

/**
* 消息内容转换配置
 * 配置fastJson返回json转换
 * @param converters
 */
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    //调用父类的配置
    super.configureMessageConverters(converters);
    //创建fastJson消息转换器
    FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
    //创建配置类
    FastJsonConfig fastJsonConfig = new FastJsonConfig();
    //修改配置返回内容的过滤
    fastJsonConfig.setSerializerFeatures(
            SerializerFeature.DisableCircularReferenceDetect,
            SerializerFeature.WriteMapNullValue,
            SerializerFeature.WriteNullStringAsEmpty
    );
    fastConverter.setFastJsonConfig(fastJsonConfig);
    //将fastjson添加到视图消息转换器列表内
    converters.add(fastConverter);
}