java – 如何发送POST请求并获取文件响应？

我想发送POST请求(如html表单)和获取文件(HTTP标题：“Content-disposition：attachment; filename =”myfile.pdf“).你能帮助我吗？

解决方法

您最好的选择可能是使用第三方库,例如 HttpClient或 HTMLUnit.

如果您更喜欢使用标准API,那就不那么复杂了.

// 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();