【spring in action 学习--springMVC搭建】在不使用web.xml的情况下,配置Srping MVC工程

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";
	}
}

  

posted on 2016-09-24 18:45  月下美妞1314  阅读(401)  评论(0编辑  收藏  举报