mvcBootDemo

分支介绍

master

基本的启动servlet mvc

spi

通过spi,无web.xml启动servlet,实现手动注册servlet的功能。

spi 分支步骤

1.去掉webapp 目录

2.resources 增加文件

文件路径：resources/META-INF/services/javax.servlet.ServletContainerInitializer
文件内容

com.demo.Initializer.DemoServletContainerInitializer

3.DemoServletContainerInitializer

注意 handlesType

Because this class declares @HandlesTypes(WebApplicationInitializer.class), Servlet 3.0+ containers will automatically scan the classpath for implementations of Spring’s WebApplicationInitializer interface and provide the set of all such types to the webAppInitializerClasses parameter of this method.

@HandlesTypes(IDemoApplicationInitializer.class)
public class DemoServletContainerInitializer implements ServletContainerInitializer {
    @Override
    public void onStartup(Set<Class<?>> set, ServletContext servletContext) throws ServletException {
        。。。。
    }
}

4.IDemoApplicationInitializer 的实现类

public class DemoServletInitializer implements IDemoApplicationInitializer {
    @Override
    public void init(ServletContext servletContext) throws ServletException {
        //添加servlet
        ServletRegistration.Dynamic demoServlet = servletContext.addServlet("demoServlet", DemoServlet.class);
        demoServlet.addMapping("/*");
    }
}

代码路径

https://gitee.com/whiteubuntu/mvc-boot-demo

学习

https://blog.csdn.net/gaohaicheng123/article/details/105827295

最后

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