Spring4 Spring MVC实战（三）——Spring MVC不通过xml配置访问HMTL和其他静态资源

时间：2022-12-10 21:34:59
先看一下xml配置的，很多博客写出来都差不多，但是又不详细。
直接看一下老外的回答，How to handle static content in Spring MVC?

国内的博客里面一般就这样写。 
<servlet>  
    <servlet-name>springMVC</servlet-name>  
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
    <load-on-startup>1</load-on-startup>  
    </servlet>  
  
    <servlet-mapping>  
        <servlet-name>springMVC</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>


就写出一块，其实我们可以写的再详细点，贴个完整的路径和配置出来。


WebContent/WEB-INF/web.xml: 
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
         http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">


 <servlet>
  <servlet-name>springmvc</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>


 <servlet-mapping>
  <servlet-name>springmvc</servlet-name>
  <url-pattern>/</url-pattern>
 </servlet-mapping>
</web-app>


WebContent/WEB-INF/springmvc-servlet.xml: 


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
 http://www.springframework.org/schema/mvc
 http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
 http://www.springframework.org/schema/context
 http://www.springframework.org/schema/context/spring-context-3.0.xsd">


    <!-- not strictly necessary for this example, but still useful, see http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-ann-controller for more information -->
 <context:component-scan base-package="springmvc.web" />


    <!-- the mvc resources tag does the magic -->
 <mvc:resources mapping="/resources/**" location="/resources/" />


    <!-- also add the following beans to get rid of some exceptions -->
 <bean      class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
 <bean
class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
 </bean>


    <!-- JSTL resolver -->
 <bean id="viewResolver"
  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="viewClass"
   value="org.springframework.web.servlet.view.JstlView" />
  <property name="prefix" value="/WEB-INF/jsp/" />
  <property name="suffix" value=".jsp" />
 </bean>


</beans>



在Spring MVC实战（一）——读《Spring in action》搭建最简单的MVC中继承AbstractAnnotationConfigDispatcherServletInitializer的类自动的配置了DispatcherServlet和
spring的应用上下文。所以我是没在web.xml中配置任何东西的。


但是我又不想在xml配置之后才能访问到静态资源和HTML，找来找去没有我想要的，那怎么办，还是看文档。http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html#mvc-config-enable
思路就是找到要搜索的关键词，static resource。


看到了文档中的HTTP caching support for static resources 


@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {


    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/resources/**")
                .addResourceLocations("/public-resources/")
                .setCacheControl(CacheControl.maxAge(1, TimeUnit.HOURS).cachePublic());
    }


}
And in XML:


<mvc:resources mapping="/resources/**" location="/public-resources/">
    <mvc:cache-control max-age="3600" cache-public="true"/>
</mvc:resources>


由于CacheControl是4.2版本之后才有的，我当前是4.1版本，所以去除setCacheControl方法。
现在的整个WebConfig.java 


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;


@Configuration
@EnableWebMvc
@ComponentScan("spittr.web")
public class WebConfig extends WebMvcConfigurerAdapter {


  @Bean
  public ViewResolver viewResolver() {
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".jsp");
    return resolver;
  }
  
  @Override
  public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
  }
  
  @Override
  public void addResourceHandlers(ResourceHandlerRegistry registry) {
	  registry.addResourceHandler("/static/**")
      .addResourceLocations("/static/");
  }
}




将test.html 置于WebContent/WEB-INF/static目录
此后再访问http://localhost:8080/projectname/static/test.html即可访问，而无需在web.xml配置任何的东西。

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