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();

            }

        }

    }

}

3、接口

package myWeb;

public interface SpringWeb {

    void config();

}

4、实现类

package myWeb;

public class SpringWebInitializer implements SpringWeb {

    //配置

    @Override

    public void config() {

        System.out.println("初始化");

    }

}

5、访问地址HttpServlet

@WebServlet("/asd")

public class ServletWeb extends HttpServlet {

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        System.out.println("Asdds");

    }

}

6、tomcat测试：

demo:https://github.com/weibanggang/serviceWebConfig

巴特西

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

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