如何（简单）生成从Java POST HTTP请求做文件上传 [英] how to (simply) generate POST http request from java to do the file upload

问题描述

我想上传使用HTTP POST从事件的Java应用程序/小程序文件。我想避免使用不包含在SE任何库，除非没有其他（可行）选项。结果
到目前为止，我想出只有非常简单的解决方案。结果
- 创建字符串（缓冲区），并兼容头填充它（ http://www.ietf.org/ RFC / rfc1867.txt ）结果
- 打开连接到服务器URL.openConnection（）和将此文件写入OutputStream的内容。结果
我还需要二进制文件手动转换成POST事件。搜索结果
我希望有一些更好的，更简单的方式来做到这一点？

I would like to upload files from java application/applet using POST http event. I would like to avoid to use any library not included in SE, unless there is no other (feasible) option.
So far I come up only with very simple solution.
- Create String (Buffer) and fill it with compatible header (http://www.ietf.org/rfc/rfc1867.txt)
- Open connection to server URL.openConnection() and write content of this file to OutputStream.
I also need to manually convert binary file into POST event.

I hope there is some better, simpler way to do this?

推荐答案

您需要使用的java.net.URL 和 java.net .URLConnection 类。

有在 HTTP一些很好的例子：// java的。 sun.com/docs/books/tutorial/networking/urls/readingWriting.html

下面是一些快速和肮脏code：

Here's some quick and nasty code:

public void post(String url) throws Exception {
	URL u = new URL(url);
	URLConnection c = u.openConnection();

	c.setDoOutput(true);
	if (c instanceof HttpURLConnection) {
		((HttpURLConnection)c).setRequestMethod("POST");
	}

	OutputStreamWriter out = new OutputStreamWriter(
		c.getOutputStream());

	// output your data here

	out.close();

	BufferedReader in = new BufferedReader(
			    new InputStreamReader(
		     		c.getInputStream()));

	String s = null;
	while ((s = in.readLine()) != null) {
		System.out.println(s);
	}
	in.close();
}

请注意，您可能仍然需要它写入连接之前urlen code（）的POST数据。

Note that you may still need to urlencode() your POST data before writing it to the connection.

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