如何使用DefaultHttpClient写入OutputStream？ [英] How do I write to an OutputStream using DefaultHttpClient?

问题描述

如何使用 org.apache.http.impl.client.DefaultHttpClient 获取 OutputStream ？

我想在输出流中写一个长字符串。

I'm looking to write a long string to an output stream.

使用 HttpURLConnection 你会像这样实现它：

Using HttpURLConnection you would implement it like so:

HttpURLConnection connection = (HttpURLConnection)url.openConnection();
OutputStream out = connection.getOutputStream();
Writer wout = new OutputStreamWriter(out);
writeXml(wout);

是否有使用 DefaultHttpClient 的方法类似于我上面有什么？如何使用 DefaultHttpClient 而不是 HttpURLConnection OutputStream >？

Is there a method using DefaultHttpClient similar to what I have above? How would I write to an OutputStream using DefaultHttpClient instead of HttpURLConnection?

例如

DefaultHttpClient client = new DefaultHttpClient();

OutputStream outstream = (get OutputStream somehow)
Writer wout = new OutputStreamWriter(out);

推荐答案

您无法直接从BasicHttpClient获取OutputStream。您必须创建一个 HttpUriRequest 对象，并为其提供一个 HttpEntity ，它封装了您要发送的内容。例如，如果您的输出足够小以适合内存，则可以执行以下操作：

You can't get an OutputStream from BasicHttpClient directly. You have to create an HttpUriRequest object and give it an HttpEntity that encapsulates the content you want to sent. For instance, if your output is small enough to fit in memory, you might do the following:

// Produce the output
ByteArrayOutputStream out = new ByteArrayOutputStream();
Writer writer = new OutputStreamWriter(out, "UTF-8");
writeXml(writer);

// Create the request
HttpPost request = new HttpPost(uri);
request.setEntity(new ByteArrayEntity(out.toByteArray()));

// Send the request
DefaultHttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(request);

如果数据足够大，你需要流式传输，那就更难了，因为没有 HttpEntity 接受OutputStream的实现。您需要写入临时文件并使用 FileEntity 或者可能设置管道并使用 InputStreamEntity

If the data is large enough that you need to stream it, it becomes more difficult because there's no HttpEntity implementation that accepts an OutputStream. You'd need to write to a temp file and use FileEntity or possibly set up a pipe and use InputStreamEntity

编辑请参阅oleg的答案，了解演示如何流式传输内容的示例代码 - 毕竟您不需要临时文件或管道。

EDIT See oleg's answer for sample code that demonstrates how to stream the content - you don't need a temp file or pipe after all.

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