springMVC框架，第一个入门案例

入门程序 场景：浏览器输入 list.action 跳转到一个商品列表页面 步骤： 1、创建web工程 2、添加jar：springMVC、spring、junit 3、在web.xml中添加一个DispatcherServlet 需要初始化一个springMVC容器 4、添加springmvc.xml 5、创建一个商品pojo 6、创建一个商品的Controller     传统方式：实现一个Controller接口      注解方式：添加一个@Controller标签 7、把Controller配置到springmvc.xml中（传统方式）    开启包扫描（注解方式） 8、创建一个jsp页面 9、tomcat测试

jar包

web.xml配置

<?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_2_5.xsd" id="WebApp_ID" version="2.5"> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> </web-app>

pojo类

package com.it.bean; import java.util.Date; public class Items { private Integer id; private String name; private Float price; private String pic; private Date createtime; private String detail; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name == null ? null : name.trim(); } public Float getPrice() { return price; } public void setPrice(Float price) { this.price = price; } public String getPic() { return pic; } public void setPic(String pic) { this.pic = pic == null ? null : pic.trim(); } public Date getCreatetime() { return createtime; } public void setCreatetime(Date createtime) { this.createtime = createtime; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail == null ? null : detail.trim(); } @Override public String toString() { return "Items [id=" + id + ", name=" + name + ", price=" + price + ", pic=" + pic + ", createtime=" + createtime + ", detail=" + detail + "]"; } }

一。使用接口的方式实现Controller类

package com.it.controller; import java.util.ArrayList; import java.util.Date; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.Controller; import com.it.bean.Items; //使用接口实现controller类，一个类只能实现一个方法 //解决：使用注解@Controller public class ItemsController implements Controller { public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { // 模拟数据 List<Items> list = new ArrayList<Items>(); for (int i = 0; i < 10; i++) { Items items = new Items(); items.setId(i); items.setCreatetime(new Date()); items.setName("小米手机"+i); items.setDetail("国产"); items.setPrice((float) (1000*i)); list.add(items); } ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("itemList", list); //相当于把数据放到了request域中 // 逻辑视图：就是jsp的路径 modelAndView.setViewName("/WEB-INF/jsp/itemList.jsp"); return modelAndView; } }

springmvc.xml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:p="http://www.springframework.org/schema/p" 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-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/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"> <bean name="/list.action" class="com.it.controller.ItemsController" ></bean> </beans>

二，使用注解的方式实现Controller类

package com.it.controller; import java.util.ArrayList; import java.util.Date; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import com.it.bean.Items; //注解写controller类 @Controller public class ItemsController2 { @RequestMapping("/list") public ModelAndView list(HttpServletRequest request, HttpServletResponse response) throws Exception { //模拟数据 List<Items> list = new ArrayList<Items>(); for (int i = 0; i < 10; i++) { Items items = new Items(); items.setId(i); items.setCreatetime(new Date()); items.setName("华为手机"+i); items.setDetail("国产"); items.setPrice((float) (1000*i)); list.add(items); } ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("itemList", list);//相当于把数据放到了request域中 // 逻辑视图：就是jsp的路径 modelAndView.setViewName("/WEB-INF/jsp/itemList.jsp"); return modelAndView; } @RequestMapping("/list2") public ModelAndView list2(HttpServletRequest request, HttpServletResponse response) throws Exception { List<Items> list=new ArrayList<Items>(); for (int i = 0; i < 10; i++) { Items items = new Items(); items.setId(i); items.setCreatetime(new Date()); items.setName("苹果手机"+i); items.setDetail("不怎么样"); items.setPrice((float) (1000*i)); list.add(items); } ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("itemList", list); modelAndView.setViewName("/WEB-INF/jsp/itemList.jsp"); return modelAndView; } }

springmvc.xml配置

<!-- 注解包扫描器 --> <context:component-scan base-package="com.it.controller"></context:component-scan>

jsp展示界面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%> <!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>查询商品列表</title> </head> <body> <form action="${pageContext.request.contextPath }/item/queryitem.action" method="post"> 查询条件： <table width="100%" border=1> <tr> <td><input type="submit" value="查询"/></td> </tr> </table> 商品列表： <table width="100%" border=1> <tr> <td>商品名称</td> <td>商品价格</td> <td>生产日期</td> <td>商品描述</td> <td>操作</td> </tr> <c:forEach items="${itemList }" var="item"> <tr> <td>${item.name }</td> <td>${item.price }</td> <td><fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd HH:mm:ss"/></td> <td>${item.detail }</td> <td><a href="${pageContext.request.contextPath }/itemEdit.action?id=${item.id}">修改</a></td> </tr> </c:forEach> </table> </form> </body> </html>

项目结构