Http API notes

The network connections API you have come into contact with are as follows:

1. HttpURLConnection

Four elements: 1, URL 2, HttpURLConnection 3, outputStream 4, inputStream

Uri.openConnection (); / / get HttpURLConnection.

Hc.setDoInput (true); / / allow input

Hc.setDoOutput (true); / / allow output

Hc.setRequestMethod ("POST"); / / set to post

Hc.setUseCaches (false); / / post does not use caching

Hc.setConnectTimeout (3000); / / set connection timeout

Hc.setReadTimeout (3000); / / set read timeout

Hc.setRequestProperty ("Content-Type", "application/x-www-form-urlencoded")

Hc.setRequestProperty ("Charset", "UTF-8")

Os = hc.getOutputStream (); / / get the output stream

Os.write (vals)

Os.flush ()

If (hc.getResponseCode () = = HttpURLConnection.HTTP_OK)

Is = hc.getInputStream (); / / get the input stream

Get HttpURLConnection through URL.

OutputStream and inputStream are obtained by HttpURLConnection.

II. HttpClient

Four elements: 1, HttpParams 2, HttpClient 3, HttpPost/HttpGet 4, HttpEntity 5, HttpResponse

BasicHttpParams httpParams = new BasicHttpParams ()

HttpConnectionParams.setConnectionTimeout (httpParams

3000)

HttpConnectionParams.setSoTimeout (httpParams,3000)

HttpClient client = new DefaultHttpClient (httpParams)

HttpPost post = new HttpPost ("http://");

Post.setHeader ()

Post.setEntity ()

HttpResponse response = client.execute (post)

If (httpResponse.getStatusLine (). GetStatusCode () = 200)

Response.getEntity ()

Note: HttpEntity should use the appropriate class

Commonly used new ByteArrayEntity (content.getBytes ("UTF-8"))

UrlEncodedFormEntity / / list of key-value pairs

Note: Content-Type

Text: for standardized representation of text information, text messages can be in multiple character sets or formats

Multipart: multiple parts used to connect the body of the message form a message, which can be different types of data

Application: used to transfer application data or binary data

Message: used to wrap an E-mail message

Image: used to transfer static picture data

Audio: used to transmit audio or audio data

Video: used to transmit moving image data, which can be a video data format edited with audio.

HTML 5 enctype attribute

The enctype attribute specifies how the form data is encoded before it is sent to the server.

Application/x-www-form-urlencoded encodes all characters before sending (default).

Multipart/form-data does not encode characters. This value is required when using a form with file upload controls.

Text/plain converts spaces to "+" symbols, but does not encode special characters.