spring的困惑--org.springframework.web.servlet.DispatcherServlet noHandlerFound
2017-05-03 10:42
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今天试了下spring mvc遇到个很奇怪的事情,按照书上配置访问时总是出现如下警告:
org.springframework.web.servlet.DispatcherServlet noHandlerFound
警告: No mapping found for HTTP request with URI [/myspring/WEB-INF/jsp/hello.jsp] in DispatcherServlet with name 'spring'
web.xml
Xml代码
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springContext.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
springContext.xml
Xml代码
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean name="/hc" class="com.hj.controllers.HelloController"/>
HelloController.java
Java代码
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
return new ModelAndView("hello");
}
在项目/WEB-INF/jsp目录下防止hello.jsp文件。按照上述配置访问http://localhost:8081/myspring/hc,应该是出现hello.jsp内容才对,但是却出现了一开始提到的警告。我搜索了许多地方,结果在一老外的提供中找到了同样的问题(http://forum.springsource.org/archive/index.php/t-71263.html),解决方法老外也说明了,只是不知道为什么。
就是将web.xml中
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
改成
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
原因:
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
该设置表示路径映射,*表示匹配所有,因此所有传入的路径都会被匹配到,进而交由DispatcherServlet处理,而[/myspring/WEB-INF/jsp/hello.jsp]没有对应的Controller,自然会发生报错。此时你需要<mvc:resources location="" mapping="">进行静态资源映射。
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
该设置表示将DispatcherServlet作为default Servlet(默认是org.apache.catalina.servlets.DefaultServlet),所有其他路径映射未匹配情况下才会交由它处理。而由于隐式映射的关系,使得 .jsp 扩展名被映射到静态资源进而被执行。
org.springframework.web.servlet.DispatcherServlet noHandlerFound
警告: No mapping found for HTTP request with URI [/myspring/WEB-INF/jsp/hello.jsp] in DispatcherServlet with name 'spring'
web.xml
Xml代码
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springContext.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
springContext.xml
Xml代码
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<bean name="/hc" class="com.hj.controllers.HelloController"/>
HelloController.java
Java代码
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
return new ModelAndView("hello");
}
在项目/WEB-INF/jsp目录下防止hello.jsp文件。按照上述配置访问http://localhost:8081/myspring/hc,应该是出现hello.jsp内容才对,但是却出现了一开始提到的警告。我搜索了许多地方,结果在一老外的提供中找到了同样的问题(http://forum.springsource.org/archive/index.php/t-71263.html),解决方法老外也说明了,只是不知道为什么。
就是将web.xml中
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
改成
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
原因:
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
该设置表示路径映射,*表示匹配所有,因此所有传入的路径都会被匹配到,进而交由DispatcherServlet处理,而[/myspring/WEB-INF/jsp/hello.jsp]没有对应的Controller,自然会发生报错。此时你需要<mvc:resources location="" mapping="">进行静态资源映射。
Xml代码
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
该设置表示将DispatcherServlet作为default Servlet(默认是org.apache.catalina.servlets.DefaultServlet),所有其他路径映射未匹配情况下才会交由它处理。而由于隐式映射的关系,使得 .jsp 扩展名被映射到静态资源进而被执行。
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