Question

我正在尝试从this tutorial学习如何编写REST API。它应该用${msg}替换index.jsp文件中的http://localhost:8080/MahlzeitServer/helloWorld/hello。

问题是当我尝试在HTTP Status 404 - /MahlzeitServer/WEB-INF/helloWorld.jsp type: Status report message: /MahlzeitServer/WEB-INF/helloWorld.jsp description: The requested resource is not available.调用servlet时，我从tomcat得到这个响应：

localhost:8080/MahlzeitServer

我注意到为什么会这样。如果我转到${msg}，则会显示该网站，但不会替换<html> <body> <h2>Hello World2!</h2> <h3>Your Message : ${msg}</h3> </body> </html>。这是 index.jsp 文件：

package com.mahlzeit.server;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/helloWorld")
public class HelloWorldController {

    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    public String hello(ModelMap model) {
        model.addAttribute("msg", "JCG Hello World!");
        return "helloWorld";
    }

    @RequestMapping(value = "/displayMessage/{msg}", method = RequestMethod.GET)
    public String displayMessage(@PathVariable String msg, ModelMap model) {
        model.addAttribute("msg", msg);
        return "helloWorld";
    }
}

HelloWorldController.java

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- CHANGED <context:component-scan base-package="com.javacodegeeks.snippets.enterprise" />-->
    <context:component-scan base-package="com.mahlzeit.server" />

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

MVC-调度-servlet.xml中

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Archetype Created Web Application</display-name>


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

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

</web-app>

的web.xml

{{1}}

Answer 1

看起来像是个案问题。尝试

@Controller
@RequestMapping("/helloworld")
public class HelloWorldController {
...

而不是

@Controller
@RequestMapping("/helloWorld")
public class HelloWorldController {

或尝试点击

http://localhost:8080/MahlzeitServer/helloWorld/hello

而不是

http://localhost:8080/MahlzeitServer/helloworld/hello

获取.servlet.DispatcherServlet noHandlerFound

1 个答案: