web项目继承ServletContainerInitializer进行访问HttpServlet(WebServlet)

java使用web项目不需要加web.xml

配置javax.servlet.ServletContainerInitializer

1、在src目录创建META-INF，META-INF目录下创建services,在services目录下创建javax.servlet.ServletContainerInitializer文件

2、配置引用接口ServletContainerInitializer

创建类MyWebConfig

package myWeb;

import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.HandlesTypes;
import java.util.Set;

@HandlesTypes(value = SpringWeb.class)
public class MyWebConfig implements ServletContainerInitializer {
    @Override
    public void onStartup(Set<Class<?>> set, ServletContext servletContext) throws ServletException {
        System.out.println("sadsa");
        for (Class<?> aClass : set) {
            SpringWeb o = null;
            try {
                o = (SpringWeb) aClass.newInstance();
                o.config();
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        }
    }
}

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