创建Web项目

开发工具idea,工具的安装什么的就不说了，去百度。 点击File——>Create project。我们需要先创建一个web项目。所有需要一个web模板。 如下图所示，创建web工程模板。

设置maven的groupId、ArtifactId如下图：

选择maven库，如下图:

最后取一个项目的名字。保存web项目创建成功。 发一下工程路径。

这里面src在第一次创建的时候，可以回耗时比较久，请等待idea创建完毕这些文件，后再开始其他操作。

###配置tomcat web项目创建好了，我们需要测试项目是否创建成功，这是需要配置tomcat了。我们需要配置configuration。如下图，标号的两个地方都可编辑configuration，即“edit configuration”操作。 出现下面的界面，选中操作。 现在server界面配置本地tomcat,在到deployment界面配置启动的war包。如下图所有，点击加号，出现war一个artifact...的选择，只需要选中一个war。如果没有出现，请注意后面的操作。 没有出现artifact...选择，重新导入maven即可。 启动刚刚配置tomact，在浏览器输入：http://localhost:8080/union/ 出现Hello World!成功。

###下载springMvc相关jar maven配置pom.xml文件。

<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans --><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-core --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-web --><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.4.RELEASE</version></dependency>

需要更新的版本，去maven库找，介绍大家几个maven库。

• http://search.maven.org/
• http://maven.outofmemory.cn/
• http://mvnrepository.com/

###修改web.xml,spring-servlet.xml web.xml内容：

<?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"><!-- 加载spring mvc --><servlet><servlet-name>spring</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/spring-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>spring</servlet-name><url-pattern>/</url-pattern></servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list></web-app>

spring-servlet.xml内容：

<?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" xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.2.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-3.2.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.2.xsd"><context:annotation-config/><context:component-scan base-package="com.controller"><context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/></context:component-scan><mvc:annotation-driven/><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/><property name="prefix" value="/html/"/><property name="suffix" value=".jsp"/></bean>
</beans>

创建源码路径

在mian下面创建Java和Test两个文件夹，Java用来保存源码，Test保存单元测试源码。同时做下图中的处理即可（ctrl+alt+shift+s出现下面界面） 创建com.controller的package后再创建ControlerTest类

package com.controller;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;/*** test* Created by Administrator on 2016/12/7.*/
@Controller
public class ControlerTest {@RequestMapping(value = "/index", method = RequestMethod.GET)public ModelAndView index() {return new ModelAndView("index1");}
}

最后在创建一个index1.jsp文件在html文件夹中。 输入http://localhost:8080/union/index 看看能不能输出index1.jsp中的内容。 结果浏览器显示：

type Exception reportmessage Handler processing failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Configdescription The server encountered an internal error that prevented it from fulfilling this request.exceptionorg.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Configorg.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:986)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)javax.servlet.http.HttpServlet.service(HttpServlet.java:622)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)javax.servlet.http.HttpServlet.service(HttpServlet.java:729)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)root causejava.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config

由错误可以知道，缺少了Config类。 导入相关jar:

 <dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency>

在输入：http://localhost:8080/union/index 好了能显示index1.jsp下的内容了。

###目录结构、pom.xml内容 pom.xml内容

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"><modelVersion>4.0.0</modelVersion><groupId>springmvc</groupId><artifactId>springmvc-test</artifactId><packaging>war</packaging><version>1.0-SNAPSHOT</version><name>springmvc-test Maven Webapp</name><url>http://maven.apache.org</url><dependencies><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-beans --><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-core --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-web --><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>4.3.4.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>4.3.4.RELEASE</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency></dependencies><build><finalName>springmvc-test</finalName></build>
</project>

目录结构：