Spring mvc控制器未调用404

我关注了很多链接，但在任何地方都没有运气。我的控制器没有呼叫，因此出现404错误

调用的url是：localhost:8080/DemoApp/login

下面是代码的快照

LoginController.java

@Controller
public class LoginController {  
public LoginController(){
    System.out.println("in controller");
}

@GetMapping("/login")
public String doLogin(Model model)  throws Exception{

    System.out.println("Login access");

    return "login";
}

}

springservlet.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc"      xmlns:p="http://www.springframework.org/schema/p"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc      http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
         http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context      http://www.springframework.org/schema/context/spring-context-4.3.xsd">
 
  <mvc:annotation-driven />
 <context:annotation-config />
  <mvc:default-servlet-handler/>
  <context:component-scan base-package="com.demoapp.LoginController" />
   <context:annotation-config />
  <bean id="viewResolver"
  class="org.springframework.web.servlet.view.InternalResourceViewResolver">      
  <property name="prefix">
  <value>/WEB-INF/views/</value>
  </property>
  <property name="suffix">
  <value>.jsp</value>
  </property>
  </bean>

<?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_2_5.xsd"
id="WebApp_ID" version="2.5">

  <display-name>DemoApp</display-name>
    <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/spring-servlet.xml</param-value>
  </init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

/WEB-INF/views/
.jsp

web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc"      xmlns:p="http://www.springframework.org/schema/p"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc      http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
         http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context      http://www.springframework.org/schema/context/spring-context-4.3.xsd">
 
  <mvc:annotation-driven />
 <context:annotation-config />
  <mvc:default-servlet-handler/>
  <context:component-scan base-package="com.demoapp.LoginController" />
   <context:annotation-config />
  <bean id="viewResolver"
  class="org.springframework.web.servlet.view.InternalResourceViewResolver">      
  <property name="prefix">
  <value>/WEB-INF/views/</value>
  </property>
  <property name="suffix">
  <value>.jsp</value>
  </property>
  </bean>

<?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_2_5.xsd"
id="WebApp_ID" version="2.5">

  <display-name>DemoApp</display-name>
    <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/spring-servlet.xml</param-value>
  </init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

DemoApp
春天
org.springframework.web.servlet.DispatcherServlet
上下文配置位置
/WEB-INF/spring-servlet.xml
1.
春天
/

---

在控制器类中，您需要一个额外的注释：

@Controller
@RequestMapping("/DemoApp")

---

如果使用：，结果是否有任何不同？如果设置属性

System.setProperty（“server.servlet.context path”，“/DemoApp”），则可以将路径修改为正在使用的路径@SpringBootApplication

中的code>不起作用。。404错误@RequestMapping（“/DemoApp”）和在添加了@GetMapping（“/login”）的方法上，您需要将login.jsp放在资源文件夹中。