HttpClient 4.0 Use

Httclient Normal Process

1. Create HttpClient instances

New=  httpclients.createdefault ();

2. Create a Request instance

Newnew httppost (URL);

3. Supplementary header information (optional)

Httppost.addheader ("Referer", "http://iservice.10010.com/e4/query/basic/history_list.html"); Httppost.addheader ("Cookie", "td_cookie=18446744072103645798; mallcity=31|310; ");

4. Supplementary Request entity

1) The URL is a restful style that already contains the parameters that need to be passed in. You can skip the direct to the next action.

2) Form

New Arraylist<namevaluepair>(); Nvps.add (new basicnamevaluepair ("QueryType", "0001")); Nvps.add(new Basicnamevaluepair ("Querycode", "0001")); Nvps.add (New Basicnamevaluepair ("Billdate", "201608")) Nvps.add (new Basicnamevaluepair ("Flag", "2")); Httppost.setentity (new urlencodedformentity (Nvps));

5. Request execution

HttpResponse response == httpclient.execute (httpget); byte [] response = Httpclient.execute (Httpget,handler);

6. Read the response content

if (Response.getstatusline (). Getstatuscode () = =     response.getentity ();      if NULL ) {                     = entity.getcontent ();             Try {           // do something useful             finally  {                instream.close ( );            }        }   

7. Release the connection

The jar to be referenced

        <!--httpclient--        <dependency>            <groupId>org.apache.httpcomponents</groupId>            <artifactId>httpclient</artifactId>            <version>4.3.4</version>        </ Dependency>        <!--httpclient--

HttpClient 4.0 Use