Servlet——动态刷新时间

墨蓝 2023-02-26 05:21 2阅读 0赞

java代码

import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.Writer;
    import java.util.Date;
    
    //返回一个页面，每秒钟刷新一次
    public class ServletDemo4 extends HttpServlet {
        
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        
            resp.setContentType("text/html; charset=utf-8");
            resp.setIntHeader("Refresh",1);
            //返回的页面中，填写到当前的时间
            //获取时间
            ///System.currentTimeMillis(); new Calender()
            Date date = new Date();
    
            Writer writer = resp.getWriter();
            writer.write("<html>");
            writer.write(date.toString());
            writer.write("</html>");
    
        }
    }

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
             http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
             version="3.1"
             metadata-complete="true">
      <servlet>
        <servlet-name>ServletDemo4</servlet-name>
        <servlet-class>ServletDemo.ServletDemo4</servlet-class>
      </servlet>
      <servlet-mapping>
        <servlet-name>ServletDemo4</servlet-name>
        <url-pattern>/ServletDemo4</url-pattern>
      </servlet-mapping>
    
    
    
    </web-app>

启动TomCat  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70]  
运行后这里的时间会自动刷新  
![在这里插入图片描述][2020071413314821.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoYXJfbQ_size_16_color_FFFFFF_t_70]: /images/20230209/d2921bab6f364842a6732b2c5402d512.png
[2020071413314821.png]: https://img-blog.csdnimg.cn/2020071413314821.png