1. 程式人生 > >web專案繼承ServletContainerInitializer進行訪問HttpServlet(WebServlet)

web專案繼承ServletContainerInitializer進行訪問HttpServlet(WebServlet)

java使用web專案不需要加web.xml

配置javax.servlet.ServletContainerInitializer

1、在src目錄建立META-INF,META-INF目錄下建立services,在services目錄下建立javax.servlet.ServletContainerInitializer檔案

2、配置引用介面ServletContainerInitializer

建立類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(); } } } }
View Code

3、介面

package myWeb;

public interface SpringWeb {
    void config();
}

4、實現類

package myWeb;

public class SpringWebInitializer implements SpringWeb {
    //配置
    @Override
    public void config() {
        System.out.println("初始化");
    }
}

5、訪問地址HttpServlet

@WebServlet("/asd")
public class ServletWeb extends HttpServlet {
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("Asdds");
    }
}

6、tomcat測試:

 

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