全註解以及靜態資源的處理
全註解的使用方式
application.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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/jeehttp://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<context:component-scan base-package="springmvc"></context:component-scan>
<mvc:annotation-driven></mvc:annotation-driven>
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaeehttp://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<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:application.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
quaninnotation類
package springmvc;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Controller
public class quaninnotation {
@RequestMapping("/math")
public ModelAndView method(HttpServletRequest req, HttpServletResponse resp){
ModelAndView mvc=new ModelAndView();
mvc.addObject("msg","你好嗎？世界");
mvc.setViewName("/hello.jsp");
return mvc;
}
}
hello.jsp
<%--
Created by IntelliJ IDEA.
User: Lenovo
Date: 2018/11/17
Time: 14:57
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
${msg}
</head>
<body>
${msg}
</body>
</html>
結果如下
此時仍然存在以下問題，無法閱讀靜態資源，例如.html的檔案，新建一個hello.html的檔案，發現其無法被找到。（這就涉及到靜態資源的處理）
hello.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
fsdfsdkfskdf
</body>
</html>
原因：
tomcat中也有很多內建的servlet，比如說資料的回顯,是怎麼樣將我們封裝的java物件放在我們的jsp頁面進行回顯呢?
由tomcat裡面的servlet做的
同理,我們需要訪問一個靜態資源,tomcat也有對應的servlet為我們處理,恰好該servlet的對映路徑也為/
在tomcat中的web.xml是先載入的,專案的web.xml是後加載的
如果配置了相同的路徑，後面的會覆蓋前面的.
也就是說,springMVC中的DispatcherServlet的對映路徑覆蓋了tomcat預設對靜態資源的處理的路徑
如果配置為/,那麼Dispatcherservlet是不是需要對靜態資源進行支援？
解決方案：
需要Spring新增支援靜態資源處理的配置:
<!-- 要支援對靜態資源的處理 -->
<mvc:default-servlet-handler/>
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:jee="http://www.springframework.org/schema/jee"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/jeehttp://www.springframework.org/schema/jee/spring-jee.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsd
">
<context:component-scan base-package="springmvc"></context:component-scan>
<mvc:annotation-driven></mvc:annotation-driven>
<mvc:default-servlet-handler></mvc:default-servlet-handler>
</beans>
