SpringMVC--HelloWorld
SpringMVC是Spring 为展现层提供的Web框架，采用了松散耦合可插拔组件结构，比其他MVC框架更具扩展性和灵活性。SpringMVC通过一套MVC注解，让POJO成为处理请求的控制器，而无须实现任何接口。
1.Web项目工程导入jar包，列表如下
commons-logging-1.2.jar
spring-aop-4.2.0.RELEASE.jar
spring-beans-4.2.0.RELEASE.jar
spring-context-4.2.0.RELEASE.jar
spring-core-4.2.0.RELEASE.jar
spring-expression-4.2.0.RELEASE.jar
spring-web-4.2.0.RELEASE.jar
spring-webmvc-4.2.0.RELEASE.jar
2.配置 web.xml
<display-name>springMVC</display-name>
<!-- 定义Spring MVC的前端控制器 -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 让Spring MVC的前端控制器拦截所有请求 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
3.配置springmvc-config.xml
<!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，
如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean --> <context:component-scan base-package="com.demo.controller"/> <!-- 视图解析器 --> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <!-- 前缀 --> <property name="prefix"> <value>/WEB-INF/content/</value> </property> <!-- 后缀 --> <property name="suffix"> <value>.jsp</value> </property> </bean>
4.请求逻辑
@Controller
public class HelloController {
private static final Log logger = LogFactory.getLog(HelloController.class);
@RequestMapping("/helloWorld")
public String helloWorld(Model model) {
model.addAttribute("message", "Hello World!");
return "helloWorld";
}
}
5.编写helloWorld.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>HelloWorld</title> </head> <body> <!-- 页面可以访问Controller传递传递出来的message --> ${requestScope.message} </body> </html>
6.显示效果
