ccframe-server/src/main/java/org/ccframe/app/WebMvcConfigurer.java

package org.ccframe.app;

import java.io.File;
import java.nio.charset.Charset;
import java.util.List;

import org.ccframe.commons.mvc.CcUserArgumentResolver;
import org.ccframe.config.GlobalEx;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

import lombok.extern.log4j.Log4j;
import lombok.extern.slf4j.Slf4j;

@Configuration
@Slf4j
public class WebMvcConfigurer extends WebMvcConfigurationSupport  {
	
	private static final String FILE_PERFIX = "file:";
	
	@Value("${app.debug.swagger}")
	private boolean swagger;
	
	/**
	 * adminUser, apiUser的自动注入参数
	 */
	@Override
    protected void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        argumentResolvers.add(new CcUserArgumentResolver());
        super.addArgumentResolvers(argumentResolvers);
    }

	@Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));
        // 这里必须加上加载默认转换器，不然bug玩死人，并且该bug目前在网络上似乎没有解决方案
        // 百度，谷歌，各大论坛等。你可以试试去掉。
        addDefaultHttpMessageConverters(converters);
    }

	@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //registry.addResourceHandler("/**").addResourceLocations("classpath:/static/");

		innerAddResourceHandlers(registry, GlobalEx.COMMON_STATICS_DIR);
		innerAddResourceHandlers(registry, GlobalEx.UPLOAD_DIR);
		innerAddResourceHandlers(registry, GlobalEx.SMALL_PICT_DIR);
		innerAddResourceHandlers(registry, GlobalEx.STATICS_DIR);
		innerAddResourceHandlers(registry, GlobalEx.TEMP_DIR);
		innerAddResourceHandlers(registry, GlobalEx.MANAGE_DIR);

        registry.addResourceHandler("/*.txt","/*.ico","/*.html").addResourceLocations(FILE_PERFIX + GlobalEx.APP_BASE_DIR + File.separator);

        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/"); //knife4j的地址
        if(swagger) {
            log.info("Inited Api document at URI /doc.html");
        }
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
	}

	/**
	 * 配置返回映射，null值字段不返回
	 * @return
	 */
	@Bean
    @Primary
    public MappingJackson2HttpMessageConverter customJackson2HttpMessageConverter(){
        MappingJackson2HttpMessageConverter convertor= new MappingJackson2HttpMessageConverter();
        ObjectMapper mapper = new ObjectMapper();
        mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        mapper.setSerializationInclusion(Include.NON_NULL);
        convertor.setObjectMapper(mapper);
        return convertor;
    }

	private void innerAddResourceHandlers(ResourceHandlerRegistry registry, String dirName) {
        registry.addResourceHandler("/" + dirName + "/**").addResourceLocations(FILE_PERFIX + GlobalEx.APP_BASE_DIR + File.separator + dirName + File.separator);
	}
	
	@Value("${app.debug.cors:false}")
	private boolean cors;

	@Override
	protected void addCorsMappings(CorsRegistry registry) {
		if(cors) {
			registry.addMapping("/**")
	        .allowedOrigins("*")
	        .allowedMethods("GET", "HEAD", "POST","PUT", "DELETE", "OPTIONS")
	        .allowedHeaders("*")
	        .exposedHeaders("access-control-allow-headers",
	                "access-control-allow-methods",
	                "access-control-allow-origin",
	                "access-control-max-age",
	                "X-Frame-Options")
	        .allowCredentials(false).maxAge(3600);
		}
		super.addCorsMappings(registry);
	}
}