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