SpingMvc 基于java 配置（0配置）

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3个文件配置最简单的SpringMVC
1创建WebAppInitializer

package com.sp.demo2;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletRegistration.Dynamic;import org.springframework.web.WebApplicationInitializer;import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;import org.springframework.web.servlet.DispatcherServlet;public class WebAppInitializer implements WebApplicationInitializer {    @Override    public void onStartup(ServletContext servletContext) throws ServletException {        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();        ctx.register(WebConfig.class);        ctx.setServletContext(servletContext); //2        Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx)); //3        servlet.addMapping("/");        servlet.setLoadOnStartup(1);        servlet.setAsyncSupported(true);//1    }}

2创建WebConfig

package com.sp.demo2;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@EnableWebMvc@ComponentScan("com.sp.demo2")public class WebConfig extends WebMvcConfigurerAdapter {    @Bean    public ViewResolver viewResolver() {        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();        viewResolver.setPrefix("/WEB-INF/jsp/");        viewResolver.setSuffix(".jsp");        viewResolver.setExposeContextBeansAsAttributes(true);        return viewResolver;    }    @Override    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {        // TODO Auto-generated method stub        configurer.enable();    }}

3创建HomeController

package com.sp.demo2;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;@Controllerpublic class HomeController {    @RequestMapping(value = "/", method = RequestMethod.GET)    public String home() {        return "home";    }}

4创建/jsp/home.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>Insert title here</title></head><body>Spring MVC </body></html>

运行就跳到对应的页面了。

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