如何在Java套接字中识别EOF？ [英] How do I recognize EOF in Java Sockets?

问题描述

我想识别Java套接字中的数据流结束。当我运行下面的代码时，它只是卡住并继续运行（它停留在值 10 ）。

I want to recognize end of data stream in Java Sockets. When I run the code below, it just stuck and keeps running (it stucks at value 10).

我也希望程序下载二进制文件，但最后一个字节总是不同的，所以我不知道如何在 >（实用）。

I also want the program to download binary files, but the last byte is always distinct, so I don't know how to stop the while (pragmatically).

String host = "example.com";
String path = "/";
Socket connection = new Socket(host, 80);

PrintWriter out = new PrintWriter(connection.getOutputStream());
  out.write("GET "+ path +" HTTP/1.1\r\nHost: "+ host +"\r\n\r\n");
out.flush();

int dataBuffer;
while ((dataBuffer = connection.getInputStream().read()) != -1)
  System.out.println(dataBuffer);

out.close();

感谢任何提示。

推荐答案

1. 您应该使用现有的HTTP库。请参见此处。


2. 您的代码按预期工作。服务器不会关闭连接， dataBuffer 永远不会变为 -1 。这是因为默认情况下连接在HTTP 1.1中保持活动状态。使用HTTP 1.0，或在请求中输入连接：关闭标题。

1. You should use existing libraries for HTTP. See here.
2. Your code works as expected. The server doesn't close the connection, and dataBuffer never becomes -1. This happens because connections are kept alive in HTTP 1.1 by default. Use HTTP 1.0, or put Connection: close header in your request.

例如：

out.write("GET "+ path +" HTTP/1.1\r\nHost: "+ host +"\r\nConnection: close\r\n\r\n");
out.flush();

int dataBuffer;
while ((dataBuffer = connection.getInputStream().read()) != -1) 
   System.out.print((char)dataBuffer);

out.close();

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