url-pattern*.htmlurl-pattern导致根路径访问404的问题

清疚 2023-02-12 08:23 7阅读 0赞

背景：有一个spring mvc项目，web.xml的配置如下

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://java.sun.com/xml/ns/javaee"
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
             id="WebApp_ID" version="3.0">
    
    
        
        <context-param>
            <param-name>contextConfigLocation</param-name>
            
            <param-value>classpath:META-INF/spring/spring-config.xml</param-value>
        </context-param>
    
        <context-param>
            <param-name>webAppRootKey</param-name>
            <param-value>manage-web.all.root</param-value>
        </context-param>
    
        <context-param>
            <param-name>log4jConfigLocation</param-name>
            <param-value>classpath:logback.xml</param-value>
        </context-param>
    
        
        <servlet>
            <servlet-name>springMVC</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:META-INF/spring/springMVC-servlet.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springMVC</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
       
    
        <filter>
            <filter-name>encodingFilter</filter-name>
            <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
            <init-param>
                <param-name>encoding</param-name>
                <param-value>UTF-8</param-value>
            </init-param>
            <init-param>
                <param-name>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
    
        <filter-mapping>
            <filter-name>encodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    
        
        <session-config>
            <session-timeout>30</session-timeout>
        </session-config>
    
        <error-page>
            <error-code>400</error-code>
            <location>/static/error.html</location>
        </error-page>
        
        <error-page>
            <error-code>404</error-code>
            <location>/static/error.html</location>
        </error-page>
        
        <error-page>
            <error-code>500</error-code>
            <location>/static/error.html</location>
        </error-page>
    
        <error-page>
            <error-code>401</error-code>
            <location>/static/error_authorization.html</location>
        </error-page>
    
    </web-app>

有一个controller是这样的定义的

@RequestMapping(value = {"/manage/main", "/"}, method = RequestMethod.GET)
        public ModelAndView index2() throws ServletException {
    }

通过localhost:8080/可以访问。

为了能够过滤html静态文件，加了

<servlet-mapping>
            <servlet-name>default</servlet-name>
            <url-pattern>*.html</url-pattern>
        </servlet-mapping>

之后再运行项目，访问localhost:8080/，就报错404了。

结论：

参考[https://blog.csdn.net/shuair/article/details/86645707][https_blog.csdn.net_shuair_article_details_86645707]

请求根路径（ip:port/项目名/，本项目部署再ROOT文件夹下面，不需要项目名） 时，如果我们自定义的servlet没有配置“/\*”前缀匹配，那么请求路径无法依据精确匹配、前缀匹配及扩展名匹配被任何servlet匹配到，此时会增加一个资源文件（welcomeResources）匹配方式，先拼接welcome-file的值再进行如上三种匹配。

本项目种一开始没有配置<url-pattern>\*.html</url-pattern>静态资源，也没有配置“/\*”前缀匹配，在访问localhost:8080/时，请求路径无法依据精确匹配、前缀匹配及扩展名匹配被任何servlet匹配到，此时welcome-file的值再进行如上三种匹配，仍然没有匹配到，进入<url-pattern>/</url-pattern>这个servlet执行。

后来增加了配置<url-pattern>\*.html</url-pattern>静态资源，访问localhost:8080/时，请求路径无法依据精确匹配、前缀匹配及扩展名匹配被任何servlet匹配到，此时welcome-file的值再进行如上三种匹配，比如说localhost:8080/index.html这个时候就后被<url-pattern>\*.html</url-pattern>匹配到了。由于本项目种没有index.html，因此报错404

[https_blog.csdn.net_shuair_article_details_86645707]: https://blog.csdn.net/shuair/article/details/86645707