java - Spring MVC : How url mapping was done before use of @RequestMapping() in spring framework?

Question

我现在正在为新项目学习 Spring MVC。在那里我遇到了 @RequestMapping 注释，用于了解如何将请求与 URL 映射。

我想了解，在不使用此注释的情况下，请求和 URL 是如何映射的？ 它是如何在 XML 文件中配置的？

Controller 代码:

@Controller
public class HelloController {

    @RequestMapping(value = "/greeting")
    public String sayHello(Model model){
        model.addAttribute("greeting","Helloworld");
        return "hello";
    }
}

servlet-config.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:osgi="http://www.springframework.org/schema/osgi" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/osgi
http://www.springframework.org/schema/osgi/spring-osgi.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

        <bean name="/greeting.html" class="com.pj.controller.HelloController"/>

        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <property name="suffix" value=".jsp"/>
        </bean>
</beans>

web.xml

<servlet>
  <servlet-name>fitTrackerServlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/config/servlet-config.xml</param-value>
  </init-param>
</servlet>

<servlet-mapping>
  <servlet-name>fitTrackerServlet</servlet-name>
  <url-pattern>*.html</url-pattern>
</servlet-mapping>

Answer 1

看看这个:Difference between the annotations @GetMapping and @RequestMapping(method = RequestMethod.GET)

现在，

1. RequestMapping 用于映射 Controller 的端点。
2. 对于 http 动词，有特定的映射注释，例如
   • @Getmapping，
   • @PostMapping，
   • @PutMapping...