spring-boot配置外部静态资源的方法

import java.io.File;



import javax.servlet.Servlet;



import lombok.extern.slf4j.Slf4j;



import org.springframework.boot.autoconfigure.AutoConfigureAfter;

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;

import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;

import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;

import org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration;

import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;

import org.springframework.context.annotation.Configuration;

import org.springframework.core.Ordered;

import org.springframework.core.annotation.Order;

import org.springframework.web.servlet.DispatcherServlet;

import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;



@Configuration

@ConditionalOnWebApplication

@ConditionalOnClass({Servlet.class, DispatcherServlet.class, WebMvcConfigurerAdapter.class})

@ConditionalOnMissingBean(WebMvcConfigurationSupport.class)

@Order(Ordered.HIGHEST_PRECEDENCE )

@AutoConfigureAfter(DispatcherServletAutoConfiguration.class)

@Slf4j

public class StaticResourceConfiguration extends WebMvcAutoConfiguration.WebMvcAutoConfigurationAdapter {

    @Override

    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        /*

        File directory = new File("");

        String path2=directory.getAbsolutePath();

        StringBuilder builder = new StringBuilder();

        builder.append("file:").append(path2).append("/m/");



        //registry.addResourceHandler("/**").addResourceLocations( builder.toString() );

        //String myExternalFilePath = "file:///C:/Temp/whatever/m/";

        log.info( builder.toString() );

        */

        

        registry.addResourceHandler("/m/**").addResourceLocations("file:m/");

        //registry.addResourceHandler("/m/**").addResourceLocations(builder.toString());



        super.addResourceHandlers(registry);

    }

}