SpringMVC（5.0）入门案例

逃离我推掉我的手 2022-05-31 02:15 190阅读 0赞

**项目源码下载：[SpringMVC][] 提供Eclipse和MyEclipse的源码和war文件**

#### 一，创建项目 ####

打开Eclipse或MyEclipse创建Web项目SpringMVC，在lib目录下导入所需的基础jar包：

![SouthEast][]

#### 二，配置web.xml文件 ####

打开web.xml文件配置SpringMVC的servlet:

<?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>SpringMVC</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>
      
      
      
      <servlet>
          <servlet-name>appServlet</servlet-name>
          <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
          <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:springmvc.xml</param-value>
            </init-param>
          <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
          <servlet-name>appServlet</servlet-name>
          <url-pattern>/</url-pattern>
      </servlet-mapping>
      
    </web-app>

###  ###

#### 三，创建Controller ####

在src目录下创建包cn.itcast.controller，在该包下新建类LoginController

package cn.itcast.controller;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.springframework.web.servlet.ModelAndView;
    import org.springframework.web.servlet.mvc.Controller;
    
    public class LoginController implements Controller{
    	//   创建日志对象
    	private static final Log logger = LogFactory.getLog(Controller.class);
    	@Override
    	public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
    		//打印日志
    		logger.info("handleRequest 被调用");
            // 创建准备返回的ModelAndView对象，该对象通常包含了返回视图的路径、模型的名称以及模型对象
            ModelAndView mv = new ModelAndView();
            // 添加模型数据 可以是任意的POJO对象  
            mv.addObject("message", "Success Login!");  
            System.out.println("username: "+arg0.getParameter("username")+"   password:"+arg0.getParameter("password"));
            // 设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面  
            mv.setViewName("/success.jsp"); 
           // 返回ModelAndView对象。
           return mv;
    	}
    
    }

###  ###

#### 四，配置springmvc.xml文件 ####

在src目录下创建配置文件springmvc.xml文件，对应于web.xml当中配置的地址

<param-value>classpath:springmvc.xml</param-value> 默认根目录地址为src/

<?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: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-4.2.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd     
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.2.xsd">
    
    	
    	<context:component-scan base-package="cn.itcast.controller"/>
    
        
        <bean name="/login" class="cn.itcast.controller.LoginController"/>   
    
        
        <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    
        
        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
    
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"/>
    	
    </beans>

#### 五，在WebRoot或WebContent下创建两个文件index.jsp,success.jsp ####

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <title>登录</title>
      </head>
      
      <body>
      	<form action="login" method="post">
      		<input type="text" name="username"/>
      		<input type="password" name="password"/>
      		<input type="submit" value="登录"/>
      	</form>
      </body>
    </html>

success.jsp:

<%@ 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>Success</title>
    </head>
    <body>
    	 ${requestScope.message}
    </body>
    </html>

![SouthEast 1][]

#### 六，运行 ####

将项目部署到tomcat上后：

![SouthEast 2][]  
  
 输入用户名和密码：123 321

![SouthEast 3][]

控制台打印：

![SouthEast 4][]

[SpringMVC]: http://download.csdn.net/download/qq_34731703/10239059
[SouthEast]: /images/20220531/0e7111a413a54ceb9f48cf14e4c9ee5d.png
[SouthEast 1]: /images/20220531/11849518ace644188db00fb6be5f64dd.png
[SouthEast 2]: /images/20220531/e73ab17b724d409b95dc838ae5559b4d.png
[SouthEast 3]: /images/20220531/b25758e60c454f3f9a911878adfd9f92.png
[SouthEast 4]: /images/20220531/ae6c7647c5794987bf54f37d89f48f20.png