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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(); 
            } 
        } 
    } 
}
View Code

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

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