这里做一个Demo：展示商品列表
新建Dynamic Web Project：
导入jar包，放在lib下：
放入Lib文件夹之后，会自动build path
接下来配置web.xml：
<?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"> <display-name>springMVC</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <!-- 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>
简单写一个商品列表的jsp页面：itemList.jsp
<%@ 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>
商品Items的POJO类：
package org.dreamtech.springmvc.pojo; import java.util.Date; public class Items { public Items(Integer id, String name, Float price, Date createtime, String detail) { super(); this.id = id; this.name = name; this.price = price; this.createtime = createtime; this.detail = detail; } 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(); } }
springmvc配置文件：SpringMVC.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" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 扫描@Controler @Service --> <context:component-scan base-package="org.dreamtech" /> </beans>
ItemController:
package org.dreamtech.springmvc.controller; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.dreamtech.springmvc.pojo.Items; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; @Controller public class ItemController { @RequestMapping(value = "/item/itemlist.action") public ModelAndView itemList() { // 创建页面需要显示的商品数据(模拟从数据库中取出) List<Items> list = new ArrayList<Items>(); list.add(new Items(1, "1华为 荣耀", 2399f, new Date(), "质量好！1")); list.add(new Items(2, "2华为 荣耀", 2399f, new Date(), "质量好！2")); list.add(new Items(3, "3华为 荣耀", 2399f, new Date(), "质量好！3")); list.add(new Items(4, "4华为 荣耀", 2399f, new Date(), "质量好！4")); list.add(new Items(5, "5华为 荣耀", 2399f, new Date(), "质量好！5")); list.add(new Items(6, "6华为 荣耀", 2399f, new Date(), "质量好！6")); ModelAndView mav = new ModelAndView(); mav.addObject("itemList", list); mav.setViewName("/WEB-INF/jsp/itemList.jsp"); return mav; } }
这里返回的是ModelAndView：这种是最全的返回类型
另外可以返回：String，直接返回视图名即可，如果要传参，带个Model，model.addAttribute()即可
这种方式推荐使用：
重定向：返回"redirect:/xx/xxx"：用于修改完信息后
转发：返回"forward:/xx/xxx"
最后一种返回voic：适用于无返回视图的情况：JSON，如果强行返回或者传参，需要servlet原生方法
启动Tomcat：
访问：http://localhost:8080/springMVC/item/itemlist.action
看到页面和数据：
到这里，第一个小案例就完成了
后边会仔细介绍SpringMVC