JavaEE_Mybatis_SpringMVC_Spring_lesson2_(多种)非注解处理器映射器与适配器

上接lesson1

重要部分

1.springmvc.xml           配置了处理器映射器,处理器(handler),适配器,视图解析器等

多个处理器映射器,适配器等可以共存

2.Handler的实现类      ItemsController1,java ,   ItemsController2,java

1.springmvc.xml           配置了处理器映射器,处理器(handler),适配器,视图解析器等

<?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 ">


	<!-- 处理器Handler: 处理器映射器映射的具体的处理器 -->
	<bean id="itemController1" name="/queryItems.action" class="cn.itcast.ssm.controller.ItemsController1"/>
	<bean id="itemController2" class="cn.itcast.ssm.controller.ItemsController2"/>

	<!-- 处理器适配器: 所有处理器适配器都实现 HandlerAdapter接口 -->
	<bean
		class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
	<!-- 处理器适配器:(第二种) 实现 -->
	<bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" />


	<!-- 处理器映射器 :	将Bean的 name的 url进行查找,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>	


	<!-- 视图解析器 -->
	<!-- ViewResolver
	 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	</bean>
</beans>
           

2.Handler的实现类      

ItemsController1,java ,  

package cn.itcast.ssm.controller;

import java.util.ArrayList;
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 cn.itcast.ssm.po.Items;

public class ItemsController1 implements Controller {

	@Override
	public ModelAndView handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		List<Items> itemsList = new ArrayList<>();

		Items items_1 = new Items();
		items_1.setName("联想笔记本");
		items_1.setPrice(6000f);
		items_1.setDetail("ThinkPad T430 联想笔记本电脑！");

		Items items_2 = new Items();
		items_2.setName("苹果手机");
		items_2.setPrice(5000f);
		items_2.setDetail("iphone6苹果手机！");

		itemsList.add(items_1);
		itemsList.add(items_2);

		// 返回ModelAndView
		ModelAndView modelAndView = new ModelAndView();

		// 相当于request 的 setAttribute, 在 jsp 页面中通过 itemList 取数据
		modelAndView.addObject("itemsList", itemsList);

		// 指定视图
		modelAndView.setViewName("/WEB-INF/jsp/items/itemsList.jsp");

		return modelAndView;
	}

}
           

 ItemsController2,java

package cn.itcast.ssm.controller;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.HttpRequestHandler;

import cn.itcast.ssm.po.Items;

public class ItemsController2 implements HttpRequestHandler {

	@Override
	public void handleRequest(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		List<Items> itemsList = new ArrayList<>();

		Items items_1 = new Items();
		items_1.setName("联想笔记本");
		items_1.setPrice(6000f);
		items_1.setDetail("ThinkPad T430 联想笔记本电脑！");

		Items items_2 = new Items();
		items_2.setName("苹果手机");
		items_2.setPrice(5000f);
		items_2.setDetail("iphone6苹果手机！");

		itemsList.add(items_1);
		itemsList.add(items_2);

		request.setAttribute("itemsList", itemsList);

		response.setCharacterEncoding("utf-8");
		response.setContentType("application/json;charset=utf-8");
		response.getWriter().write("json串");

		request.getRequestDispatcher("/WEB-INF/jsp/items/itemsList.jsp")
				.forward(request, response);

		response.setCharacterEncoding("utf-8");
		response.setContentType("application/json;charset=utf-8");
		response.getWriter().write("json串");
	}
}