在Spring源码项目中创建使用Springmvc功能模块

1.新建一个module，创建一个gradle的Java模块

2.项目完成之后，添加相关依赖

dependencies {
    compile fileTree(dir:'lib',includes: ['*jar'])

　　compile group: 'org.apache.tomcat.embed', name: 'tomcat-embed-core', version: '8.5.57'

 　 compile project(":spring-context") compile project(":spring-webmvc") 

　　testCompile group: 'junit', name: 'junit', version: '4.12' }

3.创建配置类Appconfig

@Configuration
@ComponentScan("com.wk")
public class Appconfig {
}

4.创建启动类SpringApplicationWk

public class SpringApplicationWk {
    public static void run() throws ServletException, LifecycleException {
        //直接初始化spring容器
        AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
        context.register(Appconfig.class);
        context.refresh();

        File base = new File(System.getProperty("java.io.tmpdir"));
        Tomcat tomcat = new Tomcat();
        tomcat.setPort(9090);


        /**
         * addWebapp表示这是一个web项目
         * contextPath Tomcat的访问路径
         * 项目的web目录
         * 所以这里不能用addWebapp(SpringBoot当中也没有这么做)
         *
         */
//        tomcat.addWebapp("/","index.html");
        Context rootContext = tomcat.addContext("/",base.getAbsolutePath());

        DispatcherServlet dispatcherServlet = new DispatcherServlet(context);

        //这段话的作用是在Tomcat的启动过程中会调用DispatcherServlet.init()方法
        //初始化controller和请求映射
        Tomcat.addServlet(rootContext,"wk", (Servlet) dispatcherServlet).setLoadOnStartup(1);
//        rootContext.addServletMapping("/","wk");
        rootContext.addServletMappingDecoded("/","wk");
        tomcat.start();
        tomcat.getServer().await();
    }
}

5.创建controller

@Controller
public class IndexController {
    @RequestMapping("/index")
    @ResponseBody
    public String index(){
        return "index";
    }
}

6.创建测试类

public class Test {
    public static void main(String[] args) {
        try {
            SpringApplicationWk.run();
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (LifecycleException e) {
            e.printStackTrace();
        }
    }
}