JavaEE_Mybatis_SpringMVC_Spring_lesson3_註解處理器對映器與介面卡以及處理器(Controller)
阿新 • • 發佈:2019-01-30
註解的處理器對映器相比與非註解的處理器對映器的優勢
:可以在一個類中寫多個RequestMapping("url")的格式,不需要以實現介面的形式進行開發,
註解:可以在一個類中完成多個action,
非註解:實現介面,一個類中只能寫一個action
另外:註解的處理器對映器需要與註解的解析器成對使用
演示程式碼(接lesson1,2)相同部分不展示
1.Springmvc.xml(配置檔案)
2.Controller實現(註解形式)
3.前端Jsp展示頁面
文件目錄結構
1.Springmvc.xml(配置檔案)
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd "> <!-- 註解的開發 --> <!-- MVC註解驅動 : 預設載入了多個引數繫結方法 JOSN轉換解析器預設載入--> <!-- <mvc:annotation-driven></mvc:annotation-driven> --> <!-- 註解處理器對映器 --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/> <!-- 註解的處理器介面卡 --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/> <!-- 元件掃描: 用來匯入handler(controller) service... --> <context:component-scan base-package="cn.itcast.ssm.controller"></context:component-scan> <!-- ================================================================================ --> <!-- ================================================================================ --> <!-- ================================================================================ --> <!-- ================================================================================ --> <!-- ================================================================================ --> <!-- 非註解的開發 --> <!-- 非註解處理器Handler: 處理器對映器對映的具體的處理器 --> <bean id="itemController1" name="/queryItems.action" class="cn.itcast.ssm.controller.ItemsController1"/> <bean id="itemController2" class="cn.itcast.ssm.controller.ItemsController2"/> <!-- 非註解處理器介面卡: 所有處理器介面卡都實現 HandlerAdapter介面 --> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" /> <!-- 非註解處理器介面卡:(第二種) 實現 --> <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" /> <!-- 非註解處理器對映器 : 將Bean的 name的 url進行查詢,需要在配置Handler指定Beanname(就是url) --> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" /> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/queryItems1.action">itemController1</prop> <prop key="/queryItems2.action">itemController1</prop> <prop key="/queryItems3.action">itemController2</prop> </props> </property> </bean> <!-- 非註解檢視解析器 --> <!-- ViewResolver --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> </bean> </beans>
2.Controller實現(註解形式)
cn.itcast.ssm.controller.ItemsController3.java
package cn.itcast.ssm.controller; import java.util.ArrayList; import java.util.List; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import cn.itcast.ssm.po.Items; @Controller public class ItemsController3 { @RequestMapping("/queryItems4") public ModelAndView queryItems() throws Exception { List<Items> itemsList = new ArrayList<>(); Items items_1 = new Items(); items_1.setName("聯想筆記本"); items_1.setPrice(6000f); items_1.setDetail("ThinkPad T430 聯想膝上型電腦!"); Items items_2 = new Items(); items_2.setName("蘋果手機"); items_2.setPrice(7000f); items_2.setDetail("iphone6蘋果手機!"); itemsList.add(items_1); itemsList.add(items_2); // 新建ModelAndView ModelAndView modelAndView = new ModelAndView(); // 相當於request 的 setAttribute, 在 jsp 頁面中通過 itemList 取資料 modelAndView.addObject("itemsList", itemsList); // 指定檢視 modelAndView.setViewName("/WEB-INF/jsp/items/itemsList.jsp"); return modelAndView; } }
3.前端Jsp展示頁面
<%@ 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>查詢商品列表</title> </head> <body> <form action="${pageContext.request.contextPath }/item/queryItem.action" method="post"> 查詢條件: <table width="100%" border=1> <tr> <td><input type="submit" value="查詢" /></td> </tr> </table> 商品列表: <table width="100%" border=1> <tr> <td>商品名稱</td> <td>商品價格</td> <td>生產日期</td> <td>商品描述</td> <td>操作</td> </tr> <c:forEach items="${itemsList }" 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="${pageContext.request.contextPath }/item/editItem.action?id=${item.id}">修改</a></td> </tr> </c:forEach> </table> </form> </body> </html>