Springmvc Hello World

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需求：点击一下index.jsp里的超链接，跳转到success.jsp页面

一、加入 jar 包

commons-logging-1.1.3.jar

spring-aop-4.0.0.RELEASE.jar

spring-beans-4.0.0.RELEASE.jar

spring-context-4.0.0.RELEASE.jar

spring-core-4.0.0.RELEASE.jar

spring-expression-4.0.0.RELEASE.jar

spring-web-4.0.0.RELEASE.jar

spring-webmvc-4.0.0.RELEASE.jar

二、在 web.xml 中 DispatcherServlet

<servlet>
<servlet-name>springDispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<!--

配置DispatcherServlet 的一个初始化参数：配置SpringMVC配置文件的位置和名称

-->
<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>springDispatcherServlet</servlet-name>

//匹配任何的请求
<url-pattern>/</url-pattern>
</servlet-mapping>

加入 Spring MVC 文件

三、编写处请求处器并标识为处器

package com.atguigu.springmvc.handler;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HelloWorld {

springmvc精华：

//1、使用@RequestMapping注解来映射请求的url

//2、返回值会通过视图解析器解析为实际的物理视图,对于InternalResourceViewResolver驶入解析器，会做如下解析

//通过 prefix(前缀)+return value +suffix(后缀)

// /WEB-INF/views/success.jsp
@RequestMapping("/helloworld")
public String hello(){
System.out.println("hello world");
return "success";
}
}

四、springmvc.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"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="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-4.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<context:component-scan base-package="com.atguigu.springmvc"></context:component-scan>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>

package com.atguigu.springmvc.handler;

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

RequestMapping不仅能作用于函数而且作用于类。

@RequestMapping("/springmvc")
@Controller
public class SpringMVCTest {
private static final String SUCCESS="success";
@RequestMapping("/testRequestMapping")
public String testRequestMapping(){
System.out.println("testRequestMapping");
return SUCCESS;
}
}

index.jsp:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<a href="springmvc/testRequestMapping">Test RequestMapping</a>
<br><br>
<a href="helloworld">hello world</a>
</body>
</html>

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