HttpURLConnection send a GET, POST request

Before the use of asynchttpclient, Encountered in the Android6.0 after the httpclient problem, and then the official update of 1.4. Version 9 replaced the httpclient as a third-party cz.msebera.android.httpclient. Knowing that Google removed httpclient after Android6.0, it is recommended to use HttpURLConnection to implement HTTP requests, and many other third-party network request frameworks are instead based on httpurlconnection, so it is considered necessary to familiarize themselves with the basic Method.

The process used:

1	Create a URL object	URL url = new URL ("http://qq.com");
2	Instantiation of HttpURLConnection	conn = (httpurlconnection) url.openconnection ();
3	Set the related properties of the request, post value, etc.	Conn.setrequestmethod ("POST"), Conn.setdooutput (), etc.
4	Get the return code to determine whether the connection is successful or not	if (conn.getresponsecode () = = HTTPURLCONNECTION.HTTP_OK)
5	Read input stream	InputStream is = Conn.getinputstream ();
6	Close connection, input stream	Conn.disconnect (); Is.close ();

Get Request:

//httpurlconnection The default is a GET request, and in the simplest case nothing needs to be set.

conn = (httpurlconnection) url.openconnection ();

InputStream is = Conn.getinputstream ();

Get Request Sample code:

Try {    url url = new url ("http://112.124.63.181/mm/Api/Public/ Timestamp ");    conn =  (httpurlconnection)  url.openconnection ();     inputstream is = conn.getinputstream ();     reader =  new bufferedreader (New inputstreamreader (IS));     STRINGBUILDER SB  = new stringbuilder ();     string line;    while   ((Line = reader.readline ())  != null)  {         sb.append (line);     }    showtext (sb.toString ());}  catch  (ioexception e)  {    e.printstacktrace ();} finally {    if  (conn != null) {conn.disconnect ();}     if  (reader != null) {        try {             reader.close ();        } catch  (IOException e)  {e.printstacktrace ();}     }}

Post Request:

The main differences between post and get:

Conn.setrequestmethod ("POST");

Conn.setdooutput (TRUE);// allow data to be submitted to the server

Conn.setusecaches (false);//post is not cached

String BODY = "PASSWORD=E10ADC3949BA59ABBE56E057F20F883E&USERNAME=TEST3";

OutputStream OS = Conn.getoutputstream ();

Os.write (Body.getbytes ());

Os.flush ();

Os.close ();

InputStream is = Conn.getinputstream ();

...

Submit data:

OutputStream OS = Conn.getoutputstream ();

Os.write (Body.getbytes ());

Os.flush ();

Os.close ();

Output a string-converted byte array directly using a low-level byte stream.

DataOutputStream dos = new DataOutputStream (OS);

OutputStreamWriter writer = new OutputStreamWriter (OS);

BufferedWriter writer = new BufferedWriter (newoutputstreamwriter (OS));

Using advanced character streams makes it easier to output strings, files, and more.

Post Request Sample code:

string urlstring =  "Http://120.77.156.236/mm/Api/Base/checkLogin"; string bodystring =  "Password=e10adc3949ba59abbe56e057f20f883e&username=test3"; Url url = new url (urlstring);conn =  (httpurlconnection)  url.openConnection ( ); Conn.setrequestmethod ("POST"); Outputstream os = conn.getoutputstream (); Os.write ( Bodystring.getbytes ("Utf-8")); Os.flush (); Os.close ();if  (Conn.getresponsecode ()  ==  HTTPURLCONNECTION.HTTP_OK)  {    inputstream is = conn.getinputstream () ;     bufferedreader reader = new bufferedreader (new  InputStreamReader (IS));     stringbuilder sb = new stringbuilder ();     String line;    while  (line = reader.readline ())  != null)  {        sb.append (line); &Nbsp;   }    return sb.tostring ();} 

Common Setup methods:

// set the request method, default is Get

Conn.setrequestmethod ("GET");

// Setting the connection server timeout

Conn.setconnecttimeout (8000);

// setting the Read server data timeout

Conn.setreadtimeout (5000);

// set whether to use the cache

Conn.setusecaches (TRUE);

// set the character set used

Conn.setrequestproperty ("Charset", "UTF-8");

// setting content Type information

Conn.setrequestproperty ("Content-type", "Application/json");

// Setting Custom Parameters

Conn.setrequestproperty ("MyKey", "myvalue");

// set whether to allow output , default to False, must be true when post data is submitted

Conn.setdooutput

// sets whether to allow input, which defaults to true, so that getInputStream has a value

Conn.setdoinput

// set the stream size for each transfer to prevent the phone from running out of memory

Conn.setchunkedstreamingmode (51200);

// Starting a connection does not require an explicit call, called getInputStream or Getresponsecode, and so on.

Conn.connect ();

This article is from a "sword Siege" blog, please make sure to keep this source http://weijiancheng.blog.51cto.com/10190955/1928480

HttpURLConnection send a GET, POST request