java - Spring MVC Controller 问题，HTTP 状态 404

Question

我正在学习 Spring MVC，但在运行我的 Web 应用程序时遇到了很大的麻烦。我的 Controller 无法工作，因此我无法映射我的请求。这是我的错误:

HTTP Status 404 – Not Found

Type Status Report

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

当我在浏览器中输入时出现同样的错误:

http://localhost:8081/showForm

http://localhost:8081/mvcapp/showForm

http://localhost:8081/processForm

我的 Controller :

@Controller

    public class HelloWorldController {


        @RequestMapping("/showForm")
        public String showForm() {
            return "helloworld-form";
        }

        @RequestMapping("/processForm")
        public String processForm() {
            return "helloworld";
        }
    }

调度程序servlet

<?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/cache"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">


    <mvc:annotation-driven/>
    <context:component-scan base-package="mvcapp"/>




    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="WEB-INF/view/"></property>
        <property name="suffix" value=".jsp"></property>

    </bean>

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>


        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>WEB-INF/dispatcher-servlet.xml</param-value>
        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

文件 TreeMap 像:/image/QSNlg.png

Answer 1

在您的bean配置 dispatcher-servlet.xml中，尝试将 InternalResourceViewResolver bean 的名为 prefix 的属性更正为以 / 开头的相对路径:

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/view/"></property>
        <property name="suffix" value=".jsp"></property>

    </bean>

或者也可以写成:

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix">
            <value>/WEB-INF/view/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>

    </bean>

参见mkYong (2010):Spring MVC InternalResourceViewResolver example