springmvc-初次接触

一，mvc做的事情

　　1，将url映射到java类或者java的方法。

　　2，封装用户提交的数据

　　3，处理请求--调用相关的业务处理--封装想相应的数据

　　4，将相应数据进行渲染，jsp或者html

二，spring mvc是一个轻量级的，基于请求响应的mvc框架。

三，为什么要学mvc

　　1，性能比struts2好，开发效率高，性能不高

　　2，简单，便捷，开发简单

　　3，天生和spring无缝集成，核心功能（ioc和aop）

　　4，使用约定优于配置

　　5，能够进行简单的junit测试

　　6，支持restful风格

　　7，异常处理

　　8，本地化

　　9，数据验证，类型转换等

　　10，有拦截器

springMVC 工作流程

       页面请求----》控制器（Controller DispatcherServlet）----》请求委托-----》处理器（XXController  实际类） ---->业务处理

       （HandlerMapping 、 HandlerAdaper 结合后将url映射到处理器）

       处理器 ----> 返回ModelAndView ----> 控制器  -----> 传递ModelAndView到 -----> 视图渲染器

       视图渲染器 ----> 返回 -----> 控制器 -----> 响应页面

使用步骤

导入jar

配置web.xml文件

在web-inf下添加springmvc配置文件  [DispatcherServletName]-servlet.xml文件 例如 springmvc-servlet.xml

头文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd 
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    
    <!-- <mvc:annotation-driven/> -->

</beans>

web.xml

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>spring-mvc_hello</display-name>
  <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <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>
  
  
</web-app>

springmvc-servlet.xml

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd 
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
        
    <!-- 配置handler-mappering -->
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
    <!-- 配置handler-Adapter -->
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    <!-- 配置渲染器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <!-- 渲染名称 试图的前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 渲染名称 试图的后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 配置请求 和 处理器 -->
    <bean name="/hello.do" class="cn.zys.controller.HelloController"></bean>
    <!-- <mvc:annotation-driven/> -->

</beans>

HelloController.java

package cn.zys.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 HelloController implements Controller{

    @Override
    public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
        // TODO Auto-generated method stub
        ModelAndView mv =new ModelAndView();
        mv.addObject("msg", "hello spring");
        mv.setViewName("hello");
        return mv;
    }
    
}

 测试地址: http://127.0.0.1:8080/spring-mvc_hello/hello.do

注解springmvc开发----------------------------------------------------------------------------------------------

导入jar

commons-logging-1.1.1.jar
jstl.jar
spring-aop-5.1.9.RELEASE.jar
spring-beans-5.1.9.RELEASE.jar
spring-context-5.1.9.RELEASE.jar
spring-core-5.1.9.RELEASE.jar
spring-expression-5.1.9.RELEASE.jar
spring-web-5.1.9.RELEASE.jar
spring-webmvc-5.1.9.RELEASE.jar

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>spring-mvc_zhujie</display-name>
  
  <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:mvc.xml</param-value>
      </init-param>
      
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <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>
</web-app>

HelloController.java

package cn.zys.controller;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller

public class HelloController {
    @RequestMapping("/hello")
    public ModelAndView hello(HttpServletRequest req,HttpServletResponse resp){
        ModelAndView vm = new ModelAndView();
        //封装要显示在试图上的数据
        vm.addObject("msg","hello spring");
        //封装视图数据名称
        vm.setViewName("hello");
        return vm;
    }
}

mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd 
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd">
        
    <!-- 配置渲染器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <!-- 渲染名称 视图的前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 渲染名称 视图的后缀 -->
        <property name="suffix" value=".jsp"/>
    </bean>
     <!-- spring扫描的包 -->
    <context:component-scan base-package="cn.zys.controller"></context:component-scan>
    
    <!-- <mvc:annotation-driven/> -->

</beans>

测试地址           http://127.0.0.1:8080/spring-mvc_zhujie/hello.do

Controller 几种配置

1，为url分配bean

 2，为url匹配bean