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java - springMVC配置的controller無法返回jsp文件
迷茫
迷茫 2017-04-18 10:54:02
[Java討論組]

當(dāng)啟動(dòng)完tomcat后,它首先展示的是index.jsp ,當(dāng)我輸入http://localhost:8080/Spring_no_2/時(shí),出現(xiàn)

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.
  1. 根據(jù)spring in action中的springMVC這一章中的demo進(jìn)行測試,環(huán)境是mac下的Ideallij,jkd1.8,tomcat9

  2. 配置好了springMVC,相關(guān)的xml文件并且啟動(dòng)tomcat后(省略了配置靜態(tài)資源和SpitterService類),無法通過訪問url使controller返回在WEB-INF/views中的jsp文件

以下是代碼文件

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_3_1.xsd"
         version="3.1">

    <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>spitter</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spitter</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

spitter-servlet.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: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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">



    <!--use annotations to create the mapping between-->
    <!-- url and class deal with request(Controller) -->
    <mvc:annotation-driven/>

    <!--scan the component and auto regist as bean-->
    <context:component-scan base-package="com.springmvc.controller"/>

    <!--Use this bean to map the jsp file according to the name return by Controller-->
    <!--It will automatically add the prefix and suffix to the name string-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

controller

package com.springmvc.controller;

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

/**
 * Created by han on 29/3/2017.
 */
@Controller
public class HomeController {
//    public static final int DEAFAULT_SPITTLES_PER_PAGE = 25;


    public HomeController() {
        System.out.println("-------HomeController init-------");
    }

    @RequestMapping("/")
    public String showHomePage() {

        System.out.println("-------showHomePage Method show-------");


        return "home";
    }
}

我的文件結(jié)構(gòu)是

請問為什么無法使home.jsp呈現(xiàn)出來?

迷茫
迷茫

業(yè)精于勤,荒于嬉;行成于思,毀于隨。

全部回復(fù)(4)
伊謝爾倫

找到了問題所在了,目錄,tomcat配置都對。
但是因?yàn)樵趙eb.xml中的以下代碼

 <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>

導(dǎo)致了監(jiān)聽的配置文件不讀取spitter-servlet.xml中的配置,
解決方法有兩個(gè):

第一:

是在 <context-param>中加入spitter-servlet.xml的地址,這樣spitter-servlet.xml和applicationContext.xml中的Bean等配置都會被讀取到。
在Spring in action 4th edition中說到Whereas DispatcherServlet is expected to load beans containing web components such as controllers, view resolvers, and handler mappings, ContextLoaderListener is expected to load the other beans in your application. These beans are typically the middle-tier and data-tier components that drive the back end of the application.
兩個(gè)不同的配置文件是為了應(yīng)對不同部分的配置而設(shè)置的

第二:

就是刪除以上代碼的配置。會自動(dòng)讀取spitter-servlet.xml中的配置。


大家講道理

親,-------showHomePage Method show-------后臺有沒有打印出來?

天蓬老師

先看看tomcat配置的對不對。
localhost:8080可以訪問成功嗎?
再看看showHomePage方法

怪我咯

默認(rèn)項(xiàng)目結(jié)構(gòu)web層是使用的webapp目錄,你可以看下部署到tomcat的項(xiàng)目的WEB-INF/views目錄下是否真的存在home.jsp?

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