Servlet中Response的flushBuffer()是怎么用的?

2.Response的flushBuffer()的用法

马克-to-win:response有个buffer,flushBuffer()会强行把Buffer的 内容写到客户端浏览器。(Forces any content in the buffer to be written to the client. ),如果你不flushBuffer的话,当程序运行到最后的右大括号的时候,Tomcat也会把Response的Buffer的东西,一次性发给客户 端。这就是在我们前面的hello world Servlet的例子当中,没有加flushBuffer的原因。

例:3.2.1

package com;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletHello1 extends HttpServlet {
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        String myN = request.getParameter("myName");
        PrintWriter pw = response.getWriter();
        for (int i = 0; i < 5; i++) {
            pw.println("back is " + myN);
/*下面两种flush方法的效果完全一样。后面的close方法针对他们俩都起效。
*/            
            // pw.flush();
            response.flushBuffer();
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
/*上面的两种flush,只要加上下面一句close,之后的东西都打印不出来了。但也不报错。*/        
//        pw.close();
        pw.println("Mark-to-win Finished");
    }
}

 

浏览器里面的输出结果是:(一共打印了五遍。遍与遍的间隔是两秒。)

back is Mark-to-win back is Mark-to-win back is Mark-to-win back is Mark-to-win back is Mark-to-win Mark-to-win Finished

更多请看:https://blog.csdn.net/qq_44594371/article/details/103155478

 

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