java 我创建了一个带有自动刷新的 PrintWriter；为什么不自动刷新？
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I created a PrintWriter with autoflush on; why isn't it autoflushing?
提问by mogli
My client is a web browser, and sending request to myserver using this url:
http://localhost
我的客户端是一个网络浏览器，并使用这个 url 向 myserver 发送请求：
http://localhost
This is the server side code. The problem lies in the run method of the ServingThreadclass.
这是服务器端代码。问题出在ServingThread类的run方法上。
class ServingThread implements Runnable{
private Socket socket ;
public ServingThread(Socket socket){
this.socket = socket ;
System.out.println("Receives a new browser request from "
+ socket + "\n\n");
}
public void run() {
PrintWriter out = null ;
try {
String str = "" ;
out = new PrintWriter( socket.getOutputStream() ) ;
out.write("This a web-page.") ;
// :-(
out.flush() ;
// :-(
socket.close() ;
System.out.println("Request successfully fulfilled.") ;
} catch (IOException io) {
System.out.println(io.getMessage());
}
}
}
Whether I am using
我是否正在使用
out = new PrintWriter( socket.getOutputStream(), true ) ;
or
或者
out = new PrintWriter( socket.getOutputStream() ) ;
the output is not coming to the browser. Output is coming to the browser only if I am manually flushing using stream using
输出没有进入浏览器。仅当我使用流手动刷新时才会输出到浏览器
out.flush() ;
My question:new PrintWriter( socket.getOutputStream(), true )is supposed to automatically flush the output buffer, but it's not doing so. Why?
我的问题：new PrintWriter( socket.getOutputStream(), true )应该自动刷新输出缓冲区，但它没有这样做。为什么？
回答by Michael Myers
From the Javadocs:
从Javadocs：
Parameters:
out- An output streamautoFlush- A boolean; if true, theprintln,printf, orformatmethods will flush the output buffer
参数：
out- 一个输出流autoFlush- 一个布尔值；如果为 true，println,printf, 或format方法将刷新输出缓冲区
It does not say that write()will flush the output buffer. Try using println()instead and it should flush like you expect it to.
它并没有说write()会刷新输出缓冲区。尝试println()改用它，它应该像您期望的那样冲洗。
