基于springMVC的HelloWorld实例

深碍√TFBOYSˉ_ 2022-06-15 05:42 177阅读 0赞

今天整理一下一个用springMVC写得helloworld需要依赖哪些包

我们配置一个springMVC的时候

## 首先是配置web.xml ##

将请求交给spring的DispatcherServlet处理   
代码如下

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">    
        <display-name>springmvctest</display-name>  <filter> <filter-name>charsetEncoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>charsetEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>  <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
     
      
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## 其次配置springmvc-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:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.2.xsd">
    
        
        <context:component-scan base-package="com.test.controller" >
            <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
    
        
        <mvc:view-controller path="/" view-name="index"/>
    
        
        <mvc:annotation-driven />
    
        
        <mvc:resources location="/assets/" mapping="/assets/**"></mvc:resources>
    
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/pages/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
    
    </beans>
    
     
      
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根据DispatcherServlet的完整路径来看，我们需要加入

spring-web-4.x.x.RELEASE.jar

## 接着启动服务查看报错并加入相关的jar ##

错误如下：

java.lang.NoClassDefFoundError: org/springframework/beans/factory/BeanNameAware

根据错误加入

spring-beans-4.x.x.RELEASE.jar

接着报错

java.lang.NoClassDefFoundError: org/springframework/context/EnvironmentAware

继续加入

spring-context-4.x.x.RELEASE.jar

接着报错

java.lang.NoClassDefFoundError: org/springframework/core/env/Environment

继续加人

spring-core-4.x.x.RELEASE.jar

接着报错

org/apache/commons/logging/LogFactory

继续加入

commons-logging-1.1.3.jar

接着报错

java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet

嗯？这个错是说找不到DispatcherServlet吗，可是在刚开始都已经将

spring-web-4.x.x.RELEASE.jar

加入了吗？   
原来DispatcherServlet虽然前缀是org.springframework.web.servlet可是它并不在spring-web-4.x.x.RELEASE.jar中   
它在

spring-webmvc-4.x.x.RELEASE.jar

中，好，将其加入   
接着报错

java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource

引入

spring-aop-4.x.x.RELEASE.jar

接着报错

java.lang.NoClassDefFoundError: org/springframework/expression/ParserContext

引入

spring-expression-4.x.x.RELEASE.jar

到这里已经不报错了

## 然后开发Controller ##

写一个helloworld

package com.test.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    @Controller
    @RequestMapping(value="/hello")
    public class HelloController { 
        @RequestMapping(value="/world",method=RequestMethod.GET)
        public String hello(Model model){
            model.addAttribute("msg", "你好spring mvc");
            return "index";
        }
    }
    
     
      
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## 最后开发展示层 ##

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>hello</title>
    </head>
    <body>
    <h1>Hello Spring</h1>
    ${msg }
    </body>
    </html>
     
      
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好了打开浏览器访问   
[http://localhost:8080/springmvctest/hello/world.html][http_localhost_8080_springmvctest_hello_world.html]

![这里写图片描述][20160113174822372]

一个简单的helloworld完成

最后的最后贴上项目结构和jar包的结构还有下载jar包的地址

我的Dynamic Web Module 是3.0的

项目结构

![这里写图片描述][20160113175743631]

jar包下载地址

推荐使用Maven中央仓库，当然这个项目也可以建成一个maven项目

Maven中央仓库地址

[http://mvnrepository.com/][http_mvnrepository.com]

[http_localhost_8080_springmvctest_hello_world.html]: http://localhost:8080/springmvctest/hello/world.html
[20160113174822372]: /images/20220615/d8735ca37ffa4fb6b3b8d59cb2870ea4.png
[20160113175743631]: /images/20220615/e380de75bb744b5fbb79c683694d208d.png
[http_mvnrepository.com]: http://mvnrepository.com/