Question

我正在关注this example：

用户控制器：

@Controller
public class UserController {
    /**
     * Static list of users to simulate Database
     */
    private static List<User> userList = new ArrayList<User>();


    /**
     * Saves the static list of users in model and renders it
     * via freemarker template.
     *
     * @param model
     * @return The index view (FTL)
     */
    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String index(@ModelAttribute("model") ModelMap model) {
        userList.add(new User("Bill", "Gates"));
        userList.add(new User("Steve", "Jobs"));
        userList.add(new User("Larry", "Page"));
        userList.add(new User("Sergey", "Brin"));
        userList.add(new User("Larry", "Ellison"));
        model.addAttribute("userList", userList);

        return "index";
    }

    /**
     * Add a new user into static user lists and display the
     * same into FTL via redirect
     *
     * @param user
     * @return Redirect to /index page to display user list
     */
    @RequestMapping(value = "/add", method = RequestMethod.POST)
    public String add(@ModelAttribute("user") User user) {

        if (null != user && null != user.getFirstname()
                && null != user.getLastname() && !user.getFirstname().isEmpty()
                && !user.getLastname().isEmpty()) {

            synchronized (userList) {
                userList.add(user);
            }

        }

        return "redirect:index.html";
    }

    class User {
        private String firstname;
        private String lastname;

        public User() {
        }

        public User(String firstname, String lastname) {
            this.firstname = firstname;
            this.lastname = lastname;

        }

        public String getFirstname() {
            return firstname;
        }

        public void setFirstname(String firstname) {
            this.firstname = firstname;
        }

        public String getLastname() {
            return lastname;
        }

        public void setLastname(String lastname) {
            this.lastname = lastname;
        }
    }

}

*-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="ua.epam.spring.hometask" />
    <context:annotation-config/>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">
        <property name="cache" value="true"/>
        <property name="prefix" value="/WEB-INF/ftl"/>
        <property name="suffix" value=".ftl"/>
    </bean>

    <bean id="freemarkerConfig" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">
        <property name="templateLoaderPath" value="/WEB-INF/ftl/"/>
    </bean>


</beans>

WEB-INF / FTL / intex.ftl：

<html>
<head><title>ViralPatel.net - FreeMarker Spring MVC Hello World</title>
<body>
<div id="header">
    <H2>
        <a href="http://viralpatel.net"><img height="37" width="236" border="0px" src="http://viralpatel.net/blogs/wp-content/themes/vp/images/logo.png" align="left"/></a>
        FreeMarker Spring MVC Hello World
    </H2>
</div>

<div id="content">

    <fieldset>
        <legend>Add User</legend>
        <form name="user" action="add.html" method="post">
            Firstname: <input type="text" name="firstname" />   <br/>
            Lastname: <input type="text" name="lastname" /> <br/>
            <input type="submit" value="   Save   " />
        </form>
    </fieldset>
    <br/>
    <table class="datatable">
        <tr>
            <th>Firstname</th>  <th>Lastname</th>
        </tr>
    <#list model["userList"] as user>
        <tr>
            <td>${user.firstname}</td> <td>${user.lastname}</td>
        </tr>
    </#list>
    </table>

</div>
</body>
</html>

并得到了这个例外：

javax.servlet.ServletException: Could not resolve view with name 'index' in servlet with name 'index'
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1237)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

问题：这个例外的共鸣是什么？如何解决？

Answer 1

在控制器重定向中，仅使用index而不是index.html。它将重定向到controller的索引方法。单击按钮后，您可以在索引页面上查看输出。

如下图所示：

@RequestMapping(value = "/Add", method = RequestMethod.POST)
        public String add(@ModelAttribute ("usr") User user){

            if (null != user && null != user.getFirstname()
                    && null != user.getLastname() && !user.getFirstname().isEmpty()
                    && !user.getLastname().isEmpty()) {
                synchronized (userList) {
                    userList.add(user);
                }
            }
            return "redirect:index";

javax.servlet.ServletException：无法解析具有名称的视图

1 个答案: