SpringMVC基本组件

客官°小女子只卖身不卖艺 2022-05-11 00:54 178阅读 0赞

1.  HttpRequestHandler 请求处理器
2.  处理器映射  
    BeanNameUrlHandlerMappingBeanNameUrlHandlerMapping  
    SimpleUrlHandlerMapping
3.  Controller 控制器接口
4.  MultiActionController 多动作控制器类
5.  UrlBasedViewResolver 基于地址的视图解析器（将不带后缀的名称字符串，自动解析成站点下有效的视图资源）
6.  InternalResourceViewResolver 内部资源视图解析器

**HttpRequestHandler Demo：**

package com.controller;
    
    import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.HttpRequestHandler;
    
    //组件1：HttpRequestHandler
    public class HelloController implements HttpRequestHandler {
    	
    	@Override
    	public void handleRequest(HttpServletRequest req, HttpServletResponse resp)
    			throws ServletException, IOException {
    		System.out.println("请求过来了");
    		resp.sendRedirect("index.jsp");
    	}
    }

**处理器映射配置**

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    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
    ">
    
    
    
    
     
     
     
     <bean name="hello" class="com.controller.HelloController"></bean>
     <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
     	<property name="mappings">
     		<props>
     			<prop key="/he*">hello</prop>
     		</props>
     	</property>
     </bean>
    </beans>

**Controller Demo**

package com.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    //组件三：Controller
    public class HelloController2 implements Controller {
    
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest req,
    			HttpServletResponse resp) throws Exception {
    		ModelAndView mv = new ModelAndView();
    		//此接口，实现了最简单的页面跳转和数据封装的操作
    		mv.setViewName("index.jsp");
    		mv.addObject("name", "bwf");
    		return mv;
    	}
    
    }

**MultiActionController Demo**

package com.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
    
    import com.entity.Person;
    
    //组件4：多动作控制器
    public class MyController extends MultiActionController {
    
    	//默认匹配执行的方法
    /*	@Override
    	protected ModelAndView handleRequestInternal(HttpServletRequest request,
    			HttpServletResponse response) throws Exception {
    		System.out.println("myController调用了吗？");
    		return null;
    	}*/
    	
    	public ModelAndView m1(HttpServletRequest request,HttpServletResponse response){
    		System.out.println("执行方法1");
    		return null;
    	}
    	
    	public ModelAndView m2(HttpServletRequest request,HttpServletResponse response){
    		System.out.println("执行方法2");
    		return null;
    	}
    	
    	public void m3(HttpServletRequest request,HttpServletResponse response){
    		System.out.println("执行方法3");
    		String name = request.getParameter("name");
    		System.out.println(name);
    		
    	}
    	
    	public void m4(HttpServletRequest request,HttpServletResponse response,String name){
    		System.out.println("执行方法4");
    		System.out.println(name);//空，无法直接传字符串
    	}
    	
    	public void m5(HttpServletRequest request,HttpServletResponse response,Person p){
    		System.out.println("执行方法5");
    		System.out.println(p.getName());//它可以将参数自动封装到类中
    	}
    	
    	public ModelAndView m6(HttpServletRequest request,HttpServletResponse response,Person p){
    		System.out.println("执行方法6");
    		ModelAndView mv = new ModelAndView();
    		mv.setViewName("../index.jsp");
    		mv.addObject("name", p.getName());
    		return mv;
    	}
    }

配置文件内容：

<bean name="/a4/*" class="com.controller.MyController"></bean>

**UrlBasedViewResolver Demo**  
ViewResolverDemo.java

package com.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    public class ViewResolverDemo implements Controller {
    
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest arg0,
    			HttpServletResponse arg1) throws Exception {
    		ModelAndView mv = new ModelAndView();
    		mv.setViewName("index");
    		//通过视图配置，自动映射到根目录下的index.jsp，好处不明显，如果是站点下多级目录就明显了
    		return mv;
    	}
    }

配置内容：

<bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
     	
     	<property name="prefix" value="/"></property>
     	<property name="suffix" value=".jsp"></property>
     	<property name="viewClass" value="org.springframework.web.servlet.view.InternalResourceView"></property>
     </bean>
     <bean name="/viewdemo" class="com.controller.ViewResolverDemo"></bean>

**InternalResourceViewResolver Demo**  
ViewResolverDemo2.java

package com.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    public class ViewResolverDemo2 implements Controller {
    
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest arg0,
    			HttpServletResponse arg1) throws Exception {
    		ModelAndView mv = new ModelAndView();
    		mv.setViewName("index");
    		return mv;
    	}
    }

配置内容：

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"></property>
    <property name="suffix" value=".jsp"></property>
    </bean>
    <bean name="/viewdemo2" class="com.controller.ViewResolverDemo2"></bean>