Question

我正在研究spring mvc，想要测试一些非常简单的基于注释的控制器，它在主页上工作正常但是当我输入 / home / user 时，它给了我 HTTP状态404 - Not Found 错误，我没有找到任何解决方法。

的web.xml

<web-app version="3.1" 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_3_1.xsd">
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--####################################-->


    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>redirect.jsp</welcome-file>
    </welcome-file-list>
</web-app>

调度-servlet.xml中

<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"
       xsi:schemaLocation="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.xsd">

    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>

    <context:component-scan base-package="spring" />

    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

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

    <!--<bean id="viewResolver"

</beans>

HomeController.java

package spring.controllers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
//@RequestMapping(value = "/home")
public class HomeController {

    @RequestMapping(value = "/home", method = RequestMethod.GET)
    public String showHomeMessage() {
        return "home";
    }
}

UserController.java

package spring.controllers;

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

@Controller
@RequestMapping("/home/user")
public class UserController {

    @RequestMapping(method = RequestMethod.GET)
    public String welcomeMessage(){
        return "user";
    }
}

redirect.jsp 只使用sendRedirect()方法并重定向到 home.jsp 。

home.jsp 和 user.jsp 只打印一个简单的 hello 消息

我做错了什么？

此致

Answer 1

您是否尝试过嵌套public class customer{ private List<Movie> currentlyRented; private List<Movie> rentingHistory; public Customer(){ } }？像这样......

public class Catalogue{
    private List<Movie> moviesAvailable;
    private List<Movie> moviesRented;
      public Catalogue(){
      moviesAvailable.add(new Movie("Matrix",1999,new Genre("SciFi"),3));
      moviesAvailable.add(new Movie("Jurassic Park",1993, new Genre("SciFi"),4));
      }
     }

我不确定您是否需要在RequestMapping上设置值（即@Controller @RequestMapping(value = "/home") public class HomeController { @RequestMapping(method = RequestMethod.GET) public String showHomeMessage() { return "home"; } @RequestMapping(value = "/user", method = RequestMethod.GET) public String welcomeMessage(){ return "user"; } }）。

Answer 2

在查看this小例子之后，我认为您的问题与您未使用@ResponseBody注释指定@Controller这一事实有关。然而，如果您使用@RequestController注释，仅仅暗示字符串类型就足够了，因为它结合了@Controller和@ResponseBody的使用

@Controller
@RequestMapping("/home/user")
public class UserController {

    @RequestMapping(method = RequestMethod.GET)
    public @ResponseBody String welcomeMessage(){
        return "user";
    }
}

同一块的替代方案是......

@RestController
@RequestMapping("/home/user")
public class UserController {

    @RequestMapping(method = RequestMethod.GET)
    public String welcomeMessage(){
        return "user";
    }
}

当然这个小例子并没有展示MediaType等等，但希望你能得到这个想法。

Java - HTTP状态404 - 未找到

2 个答案: