一、Spring MVC 简介
DispatcherServlet是Spring MVC的核心，他负责将请求路由到其他的组件中。 在servlet3.0 之前，传统的搭建Spring MVC工程时，像DispatcherServlet这样Servlet都会配置在web.xml文件中。
在servlet3.0 中对功能进行了增强， 所以不需要将DispatcherServlet配置在web.xml中。
二、 相关代码
1、webconfig---> 这个文件中主要是用来几个功能：a、启用 Spring MVC ；b、配置视图解析； c、配置静态资源之类；
package spittr.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
/*
* @Configuration : 表明这个是spring的配置文件
* @EnableWebMvc : 启用Spring MVC
* @ComponentScan : 组件扫描
*/
@Configuration
@EnableWebMvc
@ComponentScan("spittr")
public class WebConfig extends WebMvcConfigurerAdapter{
/*
* 配置jsp视图解析器
*/
@Bean
public ViewResolver viewResolver(){
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
/*
* 配置静态资源的处理
* @see org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter#configureDefaultServletHandling(org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer)
*/
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
2、RootConfig --->
package spittr.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages={"spittr"}, excludeFilters={ @Filter(type=FilterType.ANNOTATION, value=EnableWebMvc.class)})
public class RootConfig {
}
3、 SpittrWebAppInitializer ---> 该文件也是就是配置了DispatcherServlet
package spittr.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class SpittrWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{
@Override
protected Class<?>[] getRootConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] {RootConfig.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
// TODO Auto-generated method stub
return new Class<?>[] {WebConfig.class};
}
@Override
protected String[] getServletMappings() {
// TODO Auto-generated method stub
return new String[] {"/"};
}
}
4、声明一个控制器
package spittr.web;
import static org.springframework.web.bind.annotation.RequestMethod.*;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/*
* 声明一下控制器
*/
@Controller
public class HomeController {
@RequestMapping(value="/", method=GET)
public String home(){
return "home";
}
}