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：
