为什么JSP页面在浏览器上显示源代码？

Question

我正在Spring MVC中练习一个示例，当我尝试访问URL时，我使用Tomcat8.5创建了动态Web项目，该URL在浏览器中显示。我在互联网上搜索未找到任何解决方案。

<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>    
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>    

       <form:form method="post" action="save">    
        <table >    
         <tr>    
          <td>Name : </td>   
          <td><form:input path="name"  /></td>  
         </tr>    
         <tr>    
          <td>Salary :</td>    
          <td><form:input path="salary" /></td>  
         </tr>   
         <tr>    
          <td>Designation :</td>    
          <td><form:input path="designation" /></td>  
         </tr>   
         <tr>    
          <td colspan="2"><input type="submit" value="Save" /></td>    
         </tr>    
        </table>    
       </form:form>  

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>SpringHelloWorld</display-name>
  <servlet>

  <servlet-name>spring</servlet-name>
     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
     <servlet-name>spring</servlet-name>
     <url-pattern>/*</url-pattern>
  </servlet-mapping>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring-servlet.xml</param-value>
    </context-param>


 <!--  <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  -->
    <mime-mapping>
    <extension>jsp</extension>
    <mime-type>text/plain</mime-type>
    </mime-mapping>


  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Spring-config.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.1.xsd  
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.1.xsd  
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
      http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd ">

    <context:annotation-config />

    <context:component-scan base-package="com.sc.*" />

    <mvc:annotation-driven />
    <mvc:resources mapping="/**" location="/" />


     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>


 </beans>