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1. 项目目录
项目目录如下图所示。
2. 源文件编写
2.1 最主要的Controller编写
HelloUserController.java :
package com.study.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
// @Controller 标识是一个控制器
@Controller
public class HelloUserController {
// 访问地址：http://localhost:8080/helloUser.form
@RequestMapping(value = "/helloUser")
// 将请求中的 username 参数的值赋给形参 userName，
// 如果请求中 没有username 参数，那么 userName 默认为 “未传入username参数”。
// defaultValue = "未传入username参数" 设置默认值
public String handleRequest(Model model, @RequestParam(value = "username",
defaultValue = "未传入username参数") String userName) throws Exception {
// 向 模型 中添加数据
model.addAttribute("message", userName);
return "helloUser";
}
}
test.java:
package com.study.springmvc;
public class test {
// empty
}
2.2 xml 文件编写
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/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- SpringMVC 的前端控制器 -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 拦截了以 ".form" 结尾的URL请求，Web 应用接收到该类请求之后 , 会调用前端控制器-->
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>*.form</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>dispatcher-servlet.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: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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/"></property>
<!-- 后缀 -->
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 扫描配置 -->
<context:component-scan base-package="com.study.springmvc.controller"></context:component-scan>
</beans>applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- empty -->
</beans>2.3 jsp 文件编写
<%--
Created by IntelliJ IDEA.
User: Yimso
Date: 2019/3/2
Time: 10:48
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>${message}</h1>
</body>
</html>
3. 项目测试
3.1 未传入 username 参数
访问 http://localhost:8080/helloUser.form ， 结果如图所示：
3.2 传入username 参数
访问 http://localhost:8080/helloUser.form?username="简单数据绑定"，结果如图所示：
END。