Springmvc入门案例（1）

据说，现在springmvc火了，好多企业都在使用，既然这样，咱们也得会点，于是乎就开始自学了，通过找资料，终于做出来了一个简单案例，这里分享供大家浏览，主要分为以下几个步骤：

一、springmvc是一个mvc框架,通过mvc很好的将数据、业务、表现进行分离
二、springmvc是围绕DispatcherServlet展开的，由DispatcherServlet负责将请求派发到特定的handler
springmvc框架搭建步骤：
   1.创建项目，拷贝springmvc相关的jar包。
   2.配置web.xml主要配置前端控制器DispatcherServlet

 <servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>

   3.在web-inf下创建springmvc配置文件，[servletname]-servlet.xml,文件名必须是springmvc-servlet.xml
   4.配置HandlerMapping映射，根据beanname找到对应的Controller（可以省略）

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

   5.创建jsp页面，需要请求发出请求的页面
   6.创建Controller,继承AbstractController，重写handleRequestInternal(HttpServletRequest request,
           HttpServletResponse response)

 //返回数据和页面@Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request,HttpServletResponse response) throws Exception {String hello = request.getParameter("file");System.out.println(hello);ModelAndView modelAndView = new ModelAndView("welcome");    //返回到的页面modelAndView.addObject("helloword",hello);                    //返回值return modelAndView;}

7.配置视图解析器

 <!-- 配置视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 配置前缀和后缀 --><property name="prefix" value="/"></property><!-- 后缀 --><property name="suffix" value=".jsp"></property></bean>

下面我把源码放上来吧；

web.xml里面的配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"><display-name></display-name>	<welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>/WEB-INF/pringMVC-servlet.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>
</web-app>

Springmvc里面的配置：

<?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:p="http://www.springframework.org/schema/p"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"><!-- 配置HandlerMapping映射，根据beanname找到对应的Controller --><bean class="org.springframework.web.servlet.mvc.support.ControllerBeanNameHandlerMapping"></bean><!-- 配置Controller --><bean id="hello.do" class="org.controller.HelloController"></bean><!-- 配置视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- 配置前缀和后缀 --><property name="prefix" value="/"></property><!-- 后缀 --><property name="suffix" value=".jsp"></property></bean>
</beans>

HelloController控制器里面的代码：

	 /**  * @Title: HelloController.java* @Package org.controller* @Description: TODO该方法的主要作用：* @author A18ccms A18ccms_gmail_com  * @date 2017-8-30 下午8:38:53* @version V1.0  */package org.controller;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.AbstractController;/**   *    * 项目名称：springmvc_day1   * 类名称：HelloController   * 类描述：   控制器* 创建人：Mu Xiongxiong  * 创建时间：2017-8-30 下午8:38:54   * 修改人：Mu Xiongxiong   * 修改时间：2017-8-30 下午8:38:54   * 修改备注：   * @version    *    */public class HelloController extends AbstractController {@Overrideprotected ModelAndView handleRequestInternal(HttpServletRequest request,HttpServletResponse response) throws Exception {String hello = request.getParameter("file");System.out.println(hello);ModelAndView modelAndView = new ModelAndView("/welcome");	//返回到的页面modelAndView.addObject("helloword",hello);					//返回值return modelAndView;}}

index.jsp里面的代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><form action="hello.do" method="post">hello:<input type="text" name="file"/><br/><input type="submit" value="提交"/></form></body>
</html>

welcome.jsp的代码：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body>hello:${helloword }</body>
</html>

最后看一下目录对应关系：