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
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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: