认识springmvc(1)

太过爱你忘了你带给我的痛 2022-04-24 08:48 201阅读 0赞

springmvc也属于spring , 需要有spring的架包作为支撑才能跑起来

Spring提供的前端控制器，所有的请求都有经过它来统一分发。在DispatcherServlet将请求分发给Spring Controller之前，需要借助于Spring提供的HandlerMapping定位到具体的Controller。

实现springmvc有两种形式

( 1 )springmvc配置文件的方式

需要导入jar包

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Nzc3l5eXk3_size_16_color_FFFFFF_t_70]

写个controller层的类(springmvc就是控制层框架)

public class HelloController implements Controller{
    
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
    		 System.out.println("--hello--");
    		 ModelAndView mv = new ModelAndView();
    		 mv.setViewName("/hello.jsp");
    		return mv;
    	}
    
    }

springmvc的配置文件

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans 
     http://www.springframework.org/schema/beans/spring-beans.xsd">
     
     
     <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping" />
     
      <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
      
      
       <bean class="com.liy.controller.HelloController" name="/hello"/>
     
     </beans>

web.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
      <display-name>springMVC-01</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
      </welcome-file-list>
    
    
    
    
       
       <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>/</url-pattern>
         </servlet-mapping>
    
    
    </web-app>

jsp页面

<body>
    	<h1>hello-springMVC</h1>
    </body>

( 2 )注解的方式

只有控制层加了注解以及配置文件有不同

controller控制层

@Controller
    @RequestMapping("/hello")
    public class HelloController {
    	
    	
    	@RequestMapping("/h1")
    	 public ModelAndView hello1(){
    		System.out.println("hello1"); 
    		ModelAndView mv = new ModelAndView();
    		mv.setViewName("/hello.jsp");
    		return mv;
    	 }
    	
    	
    	@RequestMapping("/h2")
    	 public ModelAndView hello2(){
    		System.out.println("hello2"); 
    		ModelAndView mv = new ModelAndView();
    		mv.setViewName("/hello.jsp");
    		return mv;
    	 }
    
    }

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:context="http://www.springframework.org/schema/context"
    	xmlns:mvc="http://www.springframework.org/schema/mvc"
    	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
     
     
      <mvc:annotation-driven></mvc:annotation-driven>
     
     
      <context:component-scan base-package="com.liy.controller"></context:component-scan>
      
     </beans>

运行结果

![在这里插入图片描述][20190420193959169.png]  
![在这里插入图片描述][20190420194006852.png]

springmvc接收参数

@Controller
    public class UserController {
    	
    	@RequestMapping("/add")
    	@ResponseBody
    	public void add(User user){
    		System.out.println(user);
    	}
    	
    	
    	@RequestMapping("/add1")
    	@ResponseBody
    	public void add1(int id,String name,String [] xq){
    		System.out.println(id+"-"+name);
    		for (String string : xq) {
    			System.out.println(string);
    		}
    	}

springmvc返回参数

@Controller
    //@SessionAttributes("msg") 以session的方式保存数据
    public class MyController {
    	
    	@RequestMapping("/fun1")	
    	public ModelAndView fun1(){
    		ModelAndView mv = new ModelAndView();
    		mv.addObject("msg", "ModelAndView的msg");
    		mv.setViewName("index");
    		return mv;
    	}
    	
    	@RequestMapping("/fun2")	
    	public String fun2(Map<String, Object> map) {
    	 
    		map.put("msg", "map的msg");
    		 
    		return "index";
    	}
    	
    	@RequestMapping("/fun3")	
    	public String fun2(Model m) {
    		m.addAttribute("msg", "model的msg");
    		return "index";
    	}
    	
    	@RequestMapping("/fun4")	
    	public String fun5(ModelMap mm){
    		mm.addAttribute("msg", "ModelMap的msg");
    		System.out.println(111);
    		return "index";
    	}
    }

jsp页面接收数据

springmvc转换器(string转换成时间) (接收的数据 用getParameter 接收的是string类型 getAttribute 接收是object类型)

转换类

public class StringToDateConverter implements Converter<String,Date>{
    
    	@Override
    	public Date convert(String arg0) {
    		 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    		 try {
    			return sdf.parse(arg0);
    		} catch (ParseException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		 return null;
    	}
    
    }

然后在配置文件中配置

<bean id="formatConverter" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
     		<property name="converters">
     			<set>
     				<bean class="com.liy.converter.StringToDateConverter" />
     			</set>
     		</property>
     			
     	</bean>
     	
    
      
    	
     	<mvc:annotation-driven  conversion-service="formatConverter" ></mvc:annotation-driven>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3Nzc3l5eXk3_size_16_color_FFFFFF_t_70]: /images/20220217/f71afc3d895540b9b8fd8da1626e900a.png
[20190420193959169.png]: /images/20220217/e662c036ac3640bc818073fa1b554c79.png
[20190420194006852.png]: /images/20220217/e034f4ad4c8b42bca4dee679f9261d84.png