web.xml

<display-name>springmvc</display-name>
<!-- 配置DispatcherServlet -->
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

springmvc.xml

<mvc:annotation-driven></mvc:annotation-driven>

<!-- 配置自动扫描的包 -->
<context:component-scan base-package="cn.yznu.springmvc"></context:component-scan>
<!-- 配置视图解析器：如何把handler 方法返回值解析为实际的物理视图 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>

Hello.java

@Controller
public class Hello {
@RequestMapping("/helloworld")
public String hello() {
System.out.println("哈哈哈哈哈");
return "success";
}
}

所有配置都弄好了 可是还是有错“

”

四月 01, 2018 8:41:06 下午 org.springframework.web.servlet.DispatcherServlet noHandlerFound
警告: No mapping found for HTTP request with URI [/springmvc_demo/helloworld] in DispatcherServlet with name 'springDispatcherServlet'