SpringMVC框架--非注解的处理器映射器和适配器

1.非注解的处理器映射器（HandlerMapping）

1.访问：http://localhost:8080/queryItems.action

<bean   name="/queryItems.action" class="spring.ssm.controller.ItemsController"/>

<!-- 处理器映射器
    将bean的name作为url进行查找，需要在配置Handler时指定beanname(就是url)
    所有的映射器都实现了HandlerMapping接口
     -->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

2.简单URL映射
访问：http://localhost:8080/huan.action
http://localhost:8080/ma.action

 <bean   name="/queryItems.action" class="spring.ssm.controller.ItemsController"/>
    <!--简单URL映射-->
    <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
        <property name="mappings">
            <props >
                <prop key="/huan.action">itemsController</prop>
                <prop key="/ma.action">itemsController</prop>
            </props>
        </property>
    </bean>

具体配置内容见：SpringMVC框架入门--（学习笔记）

2.非注解的适配器（HandlerAdapter）

1.适配器SimpleControllerHandlerAdapter

• 要求所有的Handler实现Controller接口

<!--要求所有的Handler实现Controller接口-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

package spring.ssm.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import spring.ssm.pojo.Items;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by ubuntu on 17-7-6.
 */
//实现Controller接口的处理器
public class ItemsController implements Controller{

    public ModelAndView handleRequest(HttpServletRequest Request, HttpServletResponse Response) throws Exception {
        List<Items> list = new ArrayList<Items>();

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

        Items items_2 = new Items();
        items_2.setName("小米手机");
        items_2.setPrice(5000f);
        items_2.setDetail("mix小米手机！");
        list.add(items_1);
        list.add(items_2);
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("itemsList",list);
        modelAndView.setViewName("WEB-INF/items/itemsList.jsp");
        return modelAndView;
    }
}

2.适配器HttpRequestHandlerAdapter

• 要求编写的Handler实现HttpRequestHandler接口

<bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter"/>

package spring.ssm.controller;

import org.springframework.web.HttpRequestHandler;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import spring.ssm.pojo.Items;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by ubuntu on 17-7-6.
 */
//实现Controller接口的处理器
public class ItemsController2 implements HttpRequestHandler {
    public void handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        List<Items> list = new ArrayList<Items>();

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

        Items items_2 = new Items();
        items_2.setName("小米手机");
        items_2.setPrice(5000f);
        items_2.setDetail("mix小米手机！");
        list.add(items_1);
        list.add(items_2);
        httpServletRequest.setAttribute("itemsList",list);
        httpServletRequest.getRequestDispatcher("WEB-INF/items/itemsList.jsp").forward(httpServletRequest,httpServletResponse);

    }
}

总结：映射器就是通过URL找Handler（Controller）

适配器就是按照要求的规则执行Handler（Controller）

.

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