JAVA-WEB资源配置

用JAVA进行编写WEB项目时，我们一般需要对WEB进行统一配置，例如制定拦截路径、页面解析器、跨域配置、fastjson报文解析、文件上传大小配置等。

@Getter
@Setter
@Configuration
public class WebConfiguration  extends WebMvcConfigurationSupport {
 
    private static final String MATCH_ALL = "/**";
 
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new RequestIdInterceptor()).addPathPatterns(MATCH_ALL);
        registry.addInterceptor(new MockRequestEntityInterceptor()).addPathPatterns(MATCH_ALL);
    }
 
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
        super.addViewControllers(registry);
    }
 
    /*
     * Spring mvc 的页面解析器配置
     */
    @Bean
    public InternalResourceViewResolver viewResolver(){
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/");
        viewResolver.setSuffix(".html");
        return viewResolver;
    }
 
    /**
     * 跨域配置
     */
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", corsConfig());
        return new CorsFilter(source);
    }
 
    /*
     * Spring mvc 的静态资源路径配置
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resource/**")
                .addResourceLocations("classpath:/static/resource/");
 
        registry.addResourceHandler("/*.html")
                .addResourceLocations("classpath:/static/");
    }
 
    /*
     * 项目序列化使用fastjson，因序列化解析器执行是列表由前至后的优先级，故把fastjson加入到序列0的位置
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.set(0,fastJsonHttpMessageConverter());
    }
 
    /*
     * 生成FastJsonHttpMessageConverter返回值解析器
     */
    public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
        FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
        converter.setFastJsonConfig(fastJsonConfig());
        converter.setSupportedMediaTypes(mediaTypes());
        return converter;
    }
 
    /*
     * 生成FastJsonHttpMessageConverter返回值解析器 - 解析详细配置
     */
    public FastJsonConfig fastJsonConfig() {
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat,
                SerializerFeature.WriteEnumUsingToString
        );
 
        // 日期时间格式及字符集配置
        fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss");
        fastJsonConfig.setCharset(Charset.forName("utf-8"));
 
        // 防止Long类型转json丢失精度的问题
        SerializeConfig serializeConfig = SerializeConfig.globalInstance;
        serializeConfig.put(Long.class, ToStringSerializer.instance);
        serializeConfig.put(Long.TYPE, ToStringSerializer.instance);
        fastJsonConfig.setSerializeConfig(serializeConfig);
        return fastJsonConfig;
    }
 
    /*
     * 生成FastJsonHttpMessageConverter返回值解析器 - 解析格式组件 支持的mediaType的类型
     * 1.application/json;charset=UTF-8
     * 2.application/json
     */
    public List<MediaType> mediaTypes() {
        List<MediaType> mediaTypeList = new ArrayList<>();
        mediaTypeList.add(MediaType.APPLICATION_JSON_UTF8);
        mediaTypeList.add(MediaType.APPLICATION_JSON);
        return mediaTypeList;
    }
 
    @Bean
    public CommonsMultipartResolver multipartResolver() {
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding("UTF-8");
        //resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
        resolver.setResolveLazily(true);
        resolver.setMaxInMemorySize(40960);
        //上传文件大小 5M 5*1024*1024
        resolver.setMaxUploadSize(5 * 1024 * 1024);
        return resolver;
    }
 
    private CorsConfiguration corsConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
 
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        corsConfiguration.setAllowCredentials(true);
        corsConfiguration.setMaxAge(3600L);
        return corsConfiguration;
    }
}