IDEA + Tomcat 搭建 Spring MVC（零xml配置）

本文摘自：IDEA + Tomcat 搭建 Spring MVC（零xml配置）_tomcat 不使用 web.xml springmvc 容器-CSDN博客

本文讲述的是使用idea搭建一个springmvc web项目，无需web.xml及各种xml配置，将分别演示controller返回一个页面和json数据，然后基于tomcat部署，主要步骤如下：

1、创建maven项目

输入如下信息，点击Next

在 src/main目录下新建webapp目录：

2、修改pom.xml，配置成war包，并按需求引入相关依赖

3、配置tomcat及相关参数

特别要注意第二张图那个配置，否则有可能访问不了：

4、主要代码

package com.francis.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
@ComponentScan("com.francis.controller")
@EnableWebMvc
public class AppConfig implements WebMvcConfigurer {
    /**
     * WebMvcConfigurer中的十多个方法基本上涵盖了spring mvc需要配置的内容，
     * 如：跨域配置、视图解析器、参数解析器、拦截器、消息转换器等等，可以按需求重写
     */

    /**
     * 配置视图解析器
     * @param registry
     */
    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.jsp("/WEB-INF/", ".html");
    }

    /**
     * 配置资源映射，否则访问不了html
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/WEB-INF/**").addResourceLocations("/WEB-INF/");
    }
}

package com.francis.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MvcController {

    @RequestMapping("/index")
    public String index() {
        return "index";
    }

    @RequestMapping("/mvc")
    @ResponseBody
    public String mvc() {
        return "Hello Spring MVC";
    }
}

package com.francis;
import com.francis.config.AppConfig;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

public class MyWebApplicationInitializer implements WebApplicationInitializer {
    public void onStartup(ServletContext servletContext) throws ServletException {
        // Load Spring web application configuration
        AnnotationConfigWebApplicationContext ac = new AnnotationConfigWebApplicationContext();
        ac.register(AppConfig.class);
        // ac.refresh();

        // Create and register the DispatcherServlet
        DispatcherServlet servlet = new DispatcherServlet(ac);
        ServletRegistration.Dynamic registration = servletContext.addServlet("dispatcherServlet", servlet);
        registration.setLoadOnStartup(1);
        registration.addMapping("/*");
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>index.html</title>
</head>
<body>
    <h2>Hello, Spring MVC</h2>
</body>
</html>