< mvc:default-servlet-handler/>的需求和用途是什么? [英] What is the need and use of <mvc:default-servlet-handler />

问题描述

Spring MVC中<mvc:default-servlet-handler />的需求是什么.我们什么时候应该使用它.到底什么时候需要.我们为什么要使用它.我遍历了stackoverflow中的几个链接，但无法获得清晰的画面或理解.有人可以解释吗?

What is the need of <mvc:default-servlet-handler /> in Spring MVC . When should we use it. When exactly is it needed. Why should we use it. I gone through few links in stackoverflow, but could not get clear picture or understanding. Can someone explain ?

推荐答案

Spring MVC中<mvc:default-servlet-handler />的需求是什么?

What is the need of <mvc:default-servlet-handler /> in Spring MVC?

使用此handler弹簧调度程序会将所有请求转发到默认的Servlet.要启用该功能，您可以使用注释或基于xml的配置，如下所示:

Using this handler spring dispatcher will forward all requests to the default Servlet. To enable the feature either you can use annotations or xml based configuration as below:

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
}

或使用XML:

<mvc:default-servlet-handler/>

它将做什么?

DefaultServletHttpRequestHandler将在启动时使用大多数主要Servlet容器(包括Tomcat，Jetty，GlassFish，JBoss，Resin)的已知名称列表，尝试在启动时为container的auto-detect auto-detect. ，WebLogic和WebSphere).如果默认Servlet是使用其他名称自定义配置的，或者在默认Servlet名称未知的情况下使用其他Servlet容器，则必须明确提供默认Servlet的名称，如以下示例所示:

The DefaultServletHttpRequestHandler will attempt to auto-detect the default Servlet for the container at startup time, using a list of known names for most of the major Servlet containers (including Tomcat, Jetty, GlassFish, JBoss, Resin, WebLogic, and WebSphere). If the default Servlet has been custom configured with a different name, or if a different Servlet container is being used where the default Servlet name is unknown, then the default Servlet’s name must be explicitly provided as in the following example:

@Configuration
@EnableWebMvc
public class WebConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable("myCustomDefaultServlet");
    }
}

或使用XML:

<mvc:default-servlet-handler default-servlet-name="myCustomDefaultServlet"/>

我们什么时候应该使用它?到底什么时候需要?我们为什么要使用它?

当您希望Spring调度程序使用默认servlet在web root下提供static resources时.

When you want spring dispatcher to serve static resources under the web root using default servlet.

如果使用的是DefaultServletHttpRequestHandler，则可以替换:

If we are using DefaultServletHttpRequestHandler, then we can replace :

    <mvc:resources mapping="/js/**" location="/js/" />
    <mvc:resources mapping="/css/**" location="/css/" />
    <mvc:resources mapping="/images/**" location="/images/" />

与:

<mvc:default-servlet-handler />

更多信息，您可以在此处 .

More you can explore here.

这篇关于< mvc:default-servlet-handler/>的需求和用途是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！