用Java流式传输HTTP响应 [英] Stream a HTTP response in Java

问题描述

我想将对HTTP请求的响应写到文件.但是我想将响应流式传输到物理文件，而不必等待整个响应被加载.

I want to write the response on an HTTP request to a File. However I want to stream the response to a physical file without waiting for the entire response to be loaded.

我实际上将向JHAT服务器发出请求，以从转储中返回所有字符串.我的浏览器在响应完成之前就挂起了，因为有70k这样的对象，我想将它们写到文件中以便扫描.

I will actually be making a request to a JHAT server for returning all the Strings from the dump. My browser hangs before the response completes as there are 70k such objects, I wanted to write them to a file so that I can scan through.

预先感谢

推荐答案

从HTTP流中读取有限数量的数据并将其写入文件流.直到所有数据都处理完毕.

Read a limited amount of data from the HTTP stream and write it to a file stream. Do this until all data has been handled.

以下是演示该原理的示例代码.在此示例中，我不处理任何I/O错误.我选择了8KB的缓冲区，它比每次处理一个字节要快，但仍然限制了每次迭代期间拉入RAM的数据量.

Here is example code demonstrating the principle. In this example I do not deal with any i/o errors. I chose an 8KB buffer to be faster than processing one byte at a time, yet still limiting the amount of data pulled into RAM during each iteration.

final URL url = new URL("http://example.com/");
final InputStream istream = url.openStream();
final OutputStream ostream = new FileOutputStream("/tmp/data.txt");

final byte[] buffer = new byte[1024*8];
while (true) {
    final int len = istream.read(buffer);
    if (len <= 0) {
        break;
    } 
    ostream.write(buffer, 0, len);
}

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