Spring MVC简单的HelloWorld例子

1.web.xml配置（主要配置Servlet）[默认情况 Spring的配置文件在WEB-INF的<servlet-name>-servlet.xml]

<?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-web01</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>
  <!-- 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>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <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>

2.Spring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:aop="http://www.springframework.org/schema/aop"
    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
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">

    <!-- 使用注解来请求映射 -->
    <mvc:annotation-driven/>

　　<!-- 配置自动扫描包 -->
    <context:component-scan base-package="com.cc8w.Controller"></context:component-scan>
 
    <bean  
        class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
        <!-- 重定向是否添加上下文路径-->
        <property name="redirectContextRelative" value="true"></property>  
        <property name="prefix" value="/WEB-INF/view/"></property>  
        <property name="suffix" value=".jsp"></property>  
    </bean> 
    

</beans>    

3.控制器写法

package com.cc8w.Controller;

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

@Controller
@RequestMapping("/HelloWorld")
public class HelloWorld {

    @RequestMapping("/hi.do")
    public String hi()
    {
        System.out.println("hi.dodo");
        return "hi";
    }
}

4.请求结果

类也可以这样

package com.cc8w.Controller;


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

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/HelloWorld")
public class HelloWorld {

    @RequestMapping("/hi.do")
    public String hi(HttpServletRequest request,HttpServletResponse response,Model model)
    {
        System.out.println("hi.dodo");
        System.out.println(request.getMethod());
        
        model.addAttribute("hi", "hi123456");
        return "hi";
    }
}

 返回模板 ： https://www.cnblogs.com/fps2tao/p/7274173.html

注意, 还要配置下日志.  

https://www.cnblogs.com/fps2tao/p/12809867.html