帮忙看看这个程序怎么回事？

[geniusjava]

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Buffering extends HttpServlet {
public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException {
res.setContentType("text/html");
res.setBufferSize(8*1024);
PrintWriter out=res.getWriter();
int size=res.getBufferSize();
log("The default buffer size is "+size);
out.println("The client won't see this");//这里为什么在屏幕上看不到呢？
res.reset();
out.println("Nor will the client see this!");//这里为什么在屏幕上看不到呢？

res.reset();
out.println("And this won't be seen if sendError() is called");
if(req.getParameter("important_parameter")==null) {
res.sendError(res.SC_BAD_REQUEST, "important_parameter needed");
}
}
}

[sikuan]

out.println("The client won't see this");//这里为什么在屏幕上看不到呢？
res.reset();//this is the reason
out.println("Nor will the client see this!");//这里为什么在屏幕上看不到呢？

res.reset();//this is the reason

public void reset() Clears any data that exists in the buffer as well as the status code and headers

[struggle007csdn]

看看是不是输出到服务器(比如TOMCAT)的DOS界面里了。

[老土豆T]

PrintWriter out=res.getWriter();
out.println("Nor will the client see this!");
就可以看到了。

res.reset();将清空response对象里的数据。

[老土豆T]

Dos 历史System.out.print

这里的out 是HttpServlet PrintWriter=res.getWrtiter();

输出到页面

[geniusjava]

你们上面说的我都试了，可是还是看不到呀？
怎么回事呀？