SpringMVC最核心：DispatcherServlet
SpringMVC环境搭建：
结构：
过程：
1.导包
2.声明SpringMVC核心Servlet：org.springframework.web.servlet.DispatcherServlet
声明Spring配置文件的路径：
1.可以自己声明
2.默认值：/WEB-INF/springDispatcherServlet-servlet.xml
3.新建Spring配置文件
（注解方式）
1.扫描器：<context:component-scan base-package="com.maya"></context:component-scan>
2.配置视图解析器，设置前缀后缀
3.开启SpringMVC注解驱动：<mvc:annotation-driven></mvc:annotation-driven>
4.编写控制器类，声明方法
5.运行页面
代码：
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_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>test_easyui2</display-name>
<!-- The front controller of this Spring Web application, responsible for handling all application requests -->
<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 初始化参数，如果不写有默认值，/WEB-INF/springDispatcherServlet-servlet.xml -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<!-- 值大于0时，启动服务器时加载，数字越小，优先级越高 -->
<load-on-startup>1</load-on-startup>
</servlet>
<!-- Map all requests to the DispatcherServlet for handling -->
<servlet-mapping>
<servlet-name>springDispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
spring-mvc.xml：
<?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">
<!-- <bean id="/helloworld" class="com.maya.controller.HelloWorldController"></bean>
spring2.5之前的配置方式
将SpringBean的名字作为映射路径的请求
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
处理适配器，将请求映射给conntroller类
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
视图解析器
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
-->
<!-- 注解方式 -->
<!-- 扫描器 -->
<context:component-scan base-package="com.maya"></context:component-scan>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/page/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 开启springmvc注解驱动 -->
<mvc:annotation-driven></mvc:annotation-driven>
</beans>
两种处理方式类：
package com.maya.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
//只能处理单一请求
public class HelloWorldController implements Controller {
@Override
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
ModelAndView mav=new ModelAndView();
mav.setViewName("page/success.jsp");
mav.addObject("message","测试，属性message");
//以上方法等同于request.setAttribute(arg0, arg1);
return mav;
}
}
注解方式：
package com.maya.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class TestController {
@RequestMapping("/testHelloWorld")
public ModelAndView testHelloWorld(){
ModelAndView mav=new ModelAndView();
mav.addObject("msg", "测试属性msg");
mav.setViewName("success");
return mav;
}
}
jsp页面：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<div>
<span>spring 2.5 之前</span>
<a href="helloworld">传送门</a>
</div>
<div>
<span>基于注解</span>
<a href="testHelloWorld">传送门2</a>
</div>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<h1>成功！！！</h1>
${message }
${msg }
</body>
</html>
常用注解：
@Controller 声明控制器类
@RequestMapping 声明映射的请求
@RequestParam 参数绑定
@PathVariable 绑定路径参数
@ResponseBody 将方法的返回值直接返回
@SessionAttribute 将指定的对象放到session
@ModelAttribute