springmvc入门实例

超、凢脫俗 2022-05-14 07:25 259阅读 0赞

### 代码执行流程： ###

浏览器中访问路径为http://localhost:8080/itemList/itemList.action

.action被web.xml中配置的\*.action拦截

\*.action这个url-pattern对应servlet-name为springmvc

springmvc对应的servlet-class中配置了springmvc.xml这个配置文件

在springmvc.xml配置文件中配置了controller包

包中的controller类加了@Controller注解，所以会扫描这个类

类中的hello方法配置的@RequestMapping为itemList,与地址栏访问的一致

### 代码  ###

jar:

![70][]

pojo:

public class Item {
    
    	/** 商品id */
    	private Integer id;
    	/** 商品名称 */
    	private String name;
    	/** 商品创建时间 */
    	private Date createtime;
    	/** 商品价格 */
    	private Double price;
    	/** 商品描述 */
    	private String detail;
    	
    	public Item() {
    	}
    
    	public Item(Integer id, String name, Date createtime, String detail) {
    		this.id = id;
    		this.name = name;
    		this.createtime = createtime;
    		this.detail = detail;
    	}
    
    	
    	public Double getPrice() {
    		return price;
    	}
    
    	public void setPrice(Double price) {
    		this.price = price;
    	}
    
    	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;
    	}
    
    	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;
    	}
    }

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

controller:

@Controller
    public class ItemControll {
    
    	@RequestMapping("itemList")
    	public ModelAndView hello(){
    	
    		ModelAndView modelAndView = new ModelAndView();
    		
    		List<Item> list = Arrays.asList(new Item(1, "海尔", new Date(), "海尔制冷冰箱"),
    										new Item(1, "格力", new Date(), "格力变频空调"),
    										new Item(1, "美的", new Date(), "美的洗衣机"),
    										new Item(1, "老板", new Date(), "老板吸油烟机"));
    		modelAndView.addObject("itemList", list);
    		//modelAndView.setViewName("/WEB-INF/jsp/itemList.jsp");
    		//springmvc.xml中配置视图解析器后这里就不需要前缀和后缀
    		modelAndView.setViewName("itemList");
    		
    		return modelAndView;
    	}
    	
    }

springmvc.xml配置文件

<?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">
    
            
            <context:component-scan base-package="controller"/>
            
            
            <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
            
            
            <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
            
            
    		<mvc:annotation-driven/>
    		
    		
    		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    			<property name="prefix" value="/WEB-INF/jsp/"></property>
    			<property name="suffix" value=".jsp"></property>
    		</bean>
    </beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
      <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>

### springmvc架构  ###

![70 1][]

[70]: /images/20220514/a0d7cdab56014226b7a3ff40924cd86a.png
[70 1]: /images/20220514/90a930d8757245afb91d5025e458d4ae.png