SpringMVC（5.0）入门案例

偏执的太偏执、 2022-05-09 12:40 151阅读 0赞

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：

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>