springmvc入门一

springmvc入门

springmvc是什么？

Springmvc和struts2都属于表现层的框架，它是spring框架的一部分

springmvc处理流程

springmvc入门程序

创建springmvc核心配置文件；springmvc本身就是spring的一个子项目，对spring兼容性很好，不需要做很多配置，这里只需要配置一个扫描controller，让spring对页面控制层controller进行管理。

config/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">
        
        <!-- 配置扫描controller，交给spring管理 -->
        <context:component-scan 
        	base-package="cn.itcast.springmvc.controller"></context:component-scan>
</beans>

WEB-INF/web.xml

配置前端控制器DispatcherServlet

<?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" version="3.0">
  <display-name>springmvc_01</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>
  
  <!-- 配置前端控制器 -->
  <servlet>
  	<servlet-name>springmvc_01</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<!-- 指定springmvc配置文件 -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param>
  </servlet>
  <!-- 设置所有以action结尾的请求进入springmvc -->
  <servlet-mapping>
  	<servlet-name>springmvc_01</servlet-name>
  	<url-pattern>*.action</url-pattern>
  </servlet-mapping>
</web-app>

创建pojo

package cn.itcast.springmvc.pojo;

import java.util.Date;

public class User {
	// 商品id
	private int id;
	// 商品名称
	private String name;
	// 商品价格
	private double price;
	// 商品创建时间
	private Date createtime;
	// 商品描述
	private String detail;
	public User() {
		super();
	}
	public User(int id, String name, double price, Date createtime, String detail) {
		super();
		this.id = id;
		this.name = name;
		this.price = price;
		this.createtime = createtime;
		this.detail = detail;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	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;
	}
}

创建UserController

package cn.itcast.springmvc.controller;

import java.util.ArrayList;
import java.util.Date;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import cn.itcast.springmvc.pojo.User;

@Controller
public class UserController {
	//映射请求
	@RequestMapping("user_list.action")
	public ModelAndView queryUserList(){
		ArrayList<User> list = new ArrayList<User>();
		list.add(new User(1, "华为p10", 3400, new Date(),"性价比高"));
		list.add(new User(2, "荣耀9", 2400, new Date(),"性价比高"));
		list.add(new User(3, "小米6s", 2500, new Date(),"性价比高"));
		list.add(new User(4, "魅族3", 400, new Date(),"经典"));
		//存放视图与数据
		ModelAndView view = new ModelAndView();
		view.addObject("userList",list);
		view.setViewName("/WEB-INF/jsp/user_list.jsp");
		return view;
	}
}

WEN-INF/jsp/user_list.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="${pageContext.request.contextPath }/queryItem.action"
		method="post">
		查询条件：
		<table width="100%" border=1>
			<tr>
				<td><input type="submit" value="查询" /></td>
			</tr>
		</table>
		商品列表：
		<table width="100%" border=1>
			<tr>
				<td>商品名称</td>
				<td>商品价格</td>
				<td>生产日期</td>
				<td>商品描述</td>
				<td>操作</td>
			</tr>
			<c:forEach items="${userList }" 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>

结果：