java - Spring MVC無法識別Controller導致返回的結果是404？
問題描述
運行環境java8 + idea2016 + spring mvc4.3 + maven3.3 + tomcat8 + ubuntu
報錯信息訪問localhost:8080/HelloWeb/hello或者localhost:8080/hello都會返回404的狀態碼：
Web.xml
<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'> <display-name>Spring MVC Form Handling</display-name> <servlet><servlet-name>HelloWeb</servlet-name><servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class><load-on-startup>1</load-on-startup> </servlet> <servlet-mapping><servlet-name>HelloWeb</servlet-name><url-pattern>/</url-pattern> </servlet-mapping></web-app>
HelloWeb-servlet.xml
<beans xmlns='http://www.springframework.org/schema/beans' xmlns:context='http://www.springframework.org/schema/context' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation=' http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd'> <context:component-scan base-package='org.neo.sml'/> <bean id='internalResourceViewResolver'> <property name='prefix' value='/WEB-INF/jsp/'/> <property name='suffix' value='.jsp'/> </bean></beans>
HelloController
import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic class HelloController { @RequestMapping(value='/hello') public String printHello(ModelMap model) {model.addAttribute('message', 'Hello Spring MVC Framework!');return 'hello'; }}
hello.jsp
<%@ page contentType='text/html;charset=UTF-8' language='java' %><html><head> <title>Hello World</title></head><body><h2>${message}</h2></body></html>補充
我猜測原因是spring mvc沒有識別@Controller注解，但是我在HelloWeb-servlet.xml中已經聲明了<context:component-scan base-package='org.neo.sml'/>，請問發生錯誤的原因可能是什么？
按照@傅易君的提示，參考so上面，我加入了<mvc:annotation-driven />，但是還是不行：
<beans xmlns='http://www.springframework.org/schema/beans' xmlns:context='http://www.springframework.org/schema/context' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:mvc='http://www.springframework.org/schema/mvc' xsi:schemaLocation='http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd'> <context:component-scan base-package='org.ziwenxie.sml'/> <mvc:annotation-driven/> <bean id='internalResourceViewResolver'><property name='prefix' value='/WEB-INF/jsp/'/><property name='suffix' value='.jsp'/> </bean></beans>
問題解答
回答1：把HelloWeb-servlet.xml放到resources里面,web.xml里面改為<servlet>
<servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:HelloWeb-servlet.xml</param-value> </init-param> </servlet>
配置HelloWeb-servlet.xml中聲明了<context:component-scan base-package='org.neo.sml'/>訪問路徑寫http://localhost:8080/sml/hello就可以了
回答2：controller打個斷電，看看是沒進controller嗎？
回答3：試試 localhost:8080/sml
回答4：先開啟注解支持：
<mvc:annotation-driven />回答5：
主要有以下幾個方面需要注意：1.在web.xml文件中是否配置xml文件的位置，保證HelloWeb-servlet.xml在src目錄下，配置如下：
<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:HelloWeb-servlet.xml</param-value> </init-param> </servlet>
2.在HelloWeb-servlet.xml文件中是否配置，如下所示：
<mvc:annotation-driven></mvc:annotation-driven> <context:component-scan base-package='cn'></context:component-scan> <bean class='org.springframework.web.servlet.view.InternalResourceViewResolver'><property name='prefix' value='/WEB-INF/jsps/'></property><property name='suffix' value='.jsp'></property> </bean>
3.項目啟動的目錄是否正確，是否需要添加項目名稱；4.啟動之后，目錄是否正確；
回答6：訪問localhost:8080/HelloWeb/hello或者localhost:8080/hello都會返回404的狀態碼
這個路徑我想你沒輸對吧？為什么是HelloWeb而不是sml？一般不是項目的名稱么，默認是。或者，你找到tomcat的server.xml，找到如下配置。
<Context docBase='test' path='/test' reloadable='true' source='org.eclipse.jst.jee.server:test'/>
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