java 如何发送 POST 请求并获得文件响应？
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How to send POST request and get file response?
提问by latata
I want to send POST request (like html form) and get file (HTTP header: "Content-Disposition: attachment; filename="myfile.pdf"). Can you help me?
我想发送 POST 请求（如 html 表单）并获取文件（HTTP 标头：“Content-Disposition：附件；文件名 =“myfile.pdf”）。你能帮我吗？
回答by aioobe
Your best option is probably to use a third party library such as HttpClientor HTMLUnit.
您最好的选择可能是使用第三方库，例如HttpClient或HTMLUnit。
If you prefer to do it with the standard API it's not that complicated.
如果您更喜欢使用标准 API 来做这件事，那就没那么复杂了。
// Construct data
String data = URLEncoder.encode("key1", "UTF-8") + "=" +
URLEncoder.encode("value1", "UTF-8");
data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" +
URLEncoder.encode("value2", "UTF-8");
// Send data
URL url = new URL("http://hostname:80/cgi");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the response
BufferedReader rd = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = rd.readLine()) != null) {
// Process line...
}
wr.close();
rd.close();
回答by Brian Agnew
Check out HttpClient. There's a pretty comprehensive tutorial here.
查看HttpClient。有一个非常全面的教程在这里。
