學習springMVC-最少jar包及簡單搭建
1.jar包下載
http://repo.spring.io/release/org/springframework/spring/4.2.4.RELEASE/
2.新建web專案，保留web.xml.
3.配置web.xml檔案(/WEB-INF/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">
<servlet 4.配置springmvc.xml檔案（在/src下 classpath即為/src）
<?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-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 自動掃描controller包下的所有類，使其認為是spring mvc的控制器 路徑即為類路徑 -->
<context:component-scan base-package="com.test.springmvc"></context:component-scan>
<!-- 配置檢視解析器 如何把handler 方法返回值解析為實際的物理檢視 根據控制器返回的字串拼接成jsp路徑：/WEB-INF/jsp/xx.jsp -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name = "prefix" value="/WEB-INF/jsp/"></property>
<property name = "suffix" value = ".jsp"></property>
</bean>
</beans>5.匯入jar包
（1） 直接啟動tomcat:
警告: No mapping found for HTTP request with URI [/SpringTest/] in DispatcherServlet with name ‘SpringMVC’
因為在web.xml中引入了org.springframework.web.servlet.DispatcherServlet，所以需要匯入spring-mvc包
（2）再來：
java.lang.ClassNotFoundException: org.springframework.context.ApplicationContextAware
匯入spring-context包
（3）再啟動：
java.lang.ClassNotFoundException: org.springframework.beans.factory.Aware
匯入spring-bean包
（4）再來：
java.lang.ClassNotFoundException: org.springframework.core.env.EnvironmentCapable
匯入spring-core包
（5）繼續：
Caused by: java.lang.NoClassDefFoundError: org/springframework/web/context/request/async/CallableProcessingInterceptor
匯入spring-web包
（6）再來：
Caused by: java.lang.NoClassDefFoundError: Lorg/apache/commons/logging/Log;
匯入commons-logging包
（7）繼續：
Caused by: java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource
匯入spring-aop包
（8）接著：
java.lang.NoClassDefFoundError: org/springframework/expression/ParserContext
匯入spring-expression包，再啟動就不報錯了。
所以最小jar包是
6.編寫控制器：
package com.test.springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class Show {
@RequestMapping("/welcome")
public String welcome() {
return "welcome";
}
}
7.編寫welcome.jsp頁面（在/WEB-INF/jsp/下）
<%@ 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>Insert title here</title>
</head>
<body>
歡迎！
</body>
</html>