SpringMVC :@RequestMapping 控制器注解实例
1. 项目目录
首先你需要会创建springMVC的入门工程(SpringMVC入门实例,点击前往),工程的项目目录如下图所示。
2. 源文件的编写
2.1 xml 文件配置
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">
<!-- 扫描配置 -->
<context:component-scan base-package="com.study.springmvc.contoller"></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">
</beans>
2.2 jsp文件配置
helloUser.jsp:
<%--
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>${message}</h1>
</body>
</html>
helloWorld.jsp
<%--
Created by IntelliJ IDEA.
User: Yimso
Date: 2019/3/1
Time: 16:25
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>${message}</h1>
</body>
</html>
2.3 java 源文件编写:
HelloUserController.java:
package com.study.springmvc.contoller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// @Controller 标识是一个控制器
@Controller
public class HelloUserController {
// url请求中必须包含一个 username 的参数
@RequestMapping(value = "/helloUser", params = "username")
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
throws Exception {
// 创建模型
ModelAndView modelAndView = new ModelAndView();
// 向 模型 中添加数据
modelAndView.addObject("message", "Hello," + request.getParameter("username") + "!");
// 返回逻辑视图
modelAndView.setViewName("/WEB-INF/jsp/helloUser.jsp");
return modelAndView;
}
}
HelloWorldController.java:
package com.study.springmvc.contoller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// @Controller 标志是一个控制器
@Controller
public class HelloWorldController{
@RequestMapping("helloWorld")
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
throws Exception {
// 创建模型
ModelAndView modelAndView = new ModelAndView();
// 向 模型 中添加数据
modelAndView.addObject("message", "Hello World");
// 返回逻辑视图
modelAndView.setViewName("/WEB-INF/jsp/helloWorld.jsp");
return modelAndView;
}
}
test.java
package com.study.springmvc;
public class test {
// empty
}
3 项目测试
3.1 测试helloWorld
访问 http://localhost:8080/helloWorld.form,运行结果如图所示:
3.2 测试helloUesr
访问http://localhost:8080/helloUser.form?username=springmvc,运行结果如图所示:
END。