用于 POST 请求的 HttpURLConnection App Engine Java 示例不起作用
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/15856215/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
HttpURLConnection App Engine Java Example for POST Request does not work
提问by Marcio Cabral
I am trying to do a POST request using urlfetch under an app engine application.
我正在尝试在应用引擎应用程序下使用 urlfetch 执行 POST 请求。
I have followed the instructions (and code) extracted from the simple example found at the App Engine documentation (here https://developers.google.com/appengine/docs/java/urlfetch/usingjavanet), under the section "Using HttpURLConnection".
我已按照从 App Engine 文档（此处为https://developers.google.com/appengine/docs/java/urlfetch/usingjavanet）中“使用 HttpURLConnection”部分的简单示例中提取的说明（和代码）进行操作.
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
String message = URLEncoder.encode("my message", "UTF-8");
try {
URL url = new URL("http://httpbin.org/post");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write("message=" + message);
writer.close();
if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
// OK
} else {
// Server returned HTTP error code.
}
} catch (MalformedURLException e) {
// ...
} catch (IOException e) {
// ...
}
In order to test this POST request, I am using the following website "http://httpbin.org/post".
为了测试这个 POST 请求，我使用了以下网站“ http://httpbin.org/post”。
The fetch and connection works - however, the connection is sent as a GET and not as POST.
获取和连接有效 - 但是，连接是作为 GET 而不是作为 POST 发送的。
Here is the response I get from for this request:
这是我对这个请求的回应：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>405 Method Not Allowed</title>
<h1>Method Not Allowed</h1><p>The method GET is not allowed for the requested URL.</p>
Have anybody run into this issue ?
有没有人遇到过这个问题？
Any help is appreciated.
任何帮助表示赞赏。
回答by Adam
As this question still gets a considerable amount of views 3 years later, I'll confirm here that the method given in the documentation sampleworks fine for making a POST request to the given URL, and has remained unchanged since this question was first posted. The working code sample is as follows:
由于这个问题在 3 年后仍然获得了相当多的浏览量，我将在此确认文档示例中给出的方法可以很好地向给定的 URL 发出 POST 请求，并且自这个问题首次发布以来一直保持不变。工作代码示例如下：
String message = URLEncoder.encode("my message", "UTF-8");
URL url = new URL("http://httpbin.org/post");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
writer.write("message=" + message);
writer.close();
StringBuffer responseString = new StringBuffer();
String line;
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = reader.readLine()) != null) {
responseString.append(line);
}
reader.close();
The following response was received:
收到以下回复：
Code: 200, message: { "args": {}, "data": "", "files": {}, "form": {
"message": "my message" }, "headers": { "Accept-Encoding":
"gzip,deflate,br", "Content-Length": "18", "Content-Type":
"application/x-www-form-urlencoded", "Host": "httpbin.org", "User-Agent":
"AppEngine-Google; (+http://code.google.com/appengine; appid: s~
<redacted>)", "X-Cloud-Trace-Context": ",<redacted>" }, "json": null,
"origin": "107.178.194.113", "url": "http://httpbin.org/post"}
回答by eimmer
Have you tried calling the flush() method of the OutputStreamWriter?
您是否尝试过调用 OutputStreamWriter 的 flush() 方法？
回答by mkxqiu
Maybe you must set content-type request property:
也许您必须设置内容类型请求属性：
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
