Android HTTPUrlConnection：如何在http正文中设置发布数据？
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Android HTTPUrlConnection : how to set post data in http body?
提问by Rob
I've already created my HTTPUrlConnection :
我已经创建了我的 HTTPUrlConnection ：
String postData = "x=val1&y=val2";
URL url = new URL(strURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setRequestProperty("Set-Cookie", sessionCookie);
conn.setRequestProperty("Content-Length", "" + Integer.toString(postData.getBytes().length));
// How to add postData as http body?
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);
I don't know how to set postData in http body. How to do so? Would I better use HttpPostinstead?
我不知道如何在 http 正文中设置 postData。怎么做？我会更好地使用HttpPost吗？
Thanks for your help.
谢谢你的帮助。
回答by Maxim Shoustin
If you want to send String only try this way:
如果您只想发送字符串，请尝试以下方式：
String str = "some string goes here";
byte[] outputInBytes = str.getBytes("UTF-8");
OutputStream os = conn.getOutputStream();
os.write( outputInBytes );
os.close();
But if you want to send as Json change Content type to:
但是，如果您想以 Json 形式发送，请将内容类型更改为：
conn.setRequestProperty("Content-Type","application/json");
and now our strwe can write:
现在str我们可以写：
String str = "{\"x\": \"val1\",\"y\":\"val2\"}";
Hope it will help,
希望它会有所帮助，
回答by PopulusTremuloides
Guruparan's linkin the comment above gives a really nice answer to this question. I highly recommend looking at it. Here is the principle that makes his solution work:
上面评论中Guruparan 的链接为这个问题提供了一个非常好的答案。我强烈建议看一下。这是使他的解决方案起作用的原则：
From what I understand, the HttpURLConnection represents the response body as an OutputStream. So you need to call something like:
据我了解，HttpURLConnection 将响应主体表示为 OutputStream。所以你需要调用类似的东西：
get the connection's output stream
获取连接的输出流
OutputStream op = conn.getOuputStream();
write the response body
编写响应正文
op.write( [/*your string in bit form*/] );
close the output stream
关闭输出流
op.close();
and then carry on your merry way with the connection (which you will still need to close).
然后继续使用连接（您仍然需要关闭）。
