最近遇到一个问题,写下来,供初学者参考
在学习Spring MVC的时候,model跳转的页面就是无法使用EL表达式,在网上搜了一些方法(加入EL开关之类),都不好使。最终发现问题是因为web.xml错误,下面把错误的跟正确的都贴出来
错误的web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="<a target=_blank href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>"
xmlns="<a target=_blank href="http://java.sun.com/xml/ns/javaee">http://java.sun.com/xml/ns/javaee</a>"
xsi:schemaLocation="<a target=_blank href="http://java.sun.com/xml/ns/javaee">http://java.sun.com/xml/ns/javaee</a> <a target=_blank href="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd</a>"
id="WebApp_ID" version="3.0">
<display-name>spring001</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>example</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>example</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
正确的web.xml
<?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">
<display-name>spring001</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>example</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>example</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
大家对比就会发现,其实就一个地方不一样
<servlet-mapping>
<servlet-name>example</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<url-pattern>/</url-pattern>这样设置就没有问题
具体原因也不解。高手可以留言说明一下
<url-pattern>/</url-pattern><url-pattern>/</url-pattern><url-pattern>/</url-pattern>