Servlet注解配置

桃扇骨 2024-04-18 08:31 60阅读 0赞

注解配置

*  servlet3.0以上，支持注解配置，不需要web.xml

步骤：

1、创建JavaEE项目，选择Servelt的版本3.0以上，可以不创建web.xml

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]  
项目目录如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]  
2、定义一个类，实现servlet接口

此时目录如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]  
3、复写方法，并在类上使用@WebServlet注解，进行配置

import javax.servlet.*;
    import javax.servlet.annotation.WebServlet;
    import java.io.IOException;
    
    @WebServlet(urlPatterns = "demo")
    public class ServletDemo implements Servlet {
        
        @Override
        public void init(ServletConfig servletConfig) throws ServletException {
        
    
        }
    
        @Override
        public ServletConfig getServletConfig() {
        
            return null;
        }
    
        @Override
        public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        
            System.out.printf("-------------------------------");
        }
    
        @Override
        public String getServletInfo() {
        
            return null;
        }
    
        @Override
        public void destroy() {
        
    
        }
    }

4、运行项目，使用浏览器访问：http://localhost:8080/webServlet\_war\_exploded/demo

现象：  
![在这里插入图片描述][2019090409112125.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/6c2237c07b3046a7adbf7f684961e9e2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/0d45811822de4737b8eef207d58d3100.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poaXpoZW5nZ3Vhbg_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/921ff592f36a495097ea6978528b0f2f.png
[2019090409112125.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/d2c3e14bec0c4c0b93876cf26c4c0ac0.png