. NET Programmer Android Learning path 3:post data to the Web API

In this example, we implement a real network interaction, post the data to the API, then receive the server's return value for processing, and introduce custom types and legends of Ali's Fastjson.

Implementation ideas such as:

1. The data of receiving customer post on the API is restored to object, and the output is appended with a suffix for each attribute;

2. Enter the user name and password on the client to compare with the server-side return;

We post to the server is name=mady&pwd=123, the server was added with the suffix Name=madya

&pwd=1231 so our client needs to enter Madya and 1231 to verify success.

The specific operation shows as follows:

First, prepare the API:

The current write API uses the ASP. NET WEB API2. Create an API project in VS2013 and configure him to support JSON first:

Open the Webapiconfig file in your project and include a configuration entry in the Register method:

Config. FORMATTERS.JSONFORMATTER.SUPPORTEDMEDIATYPES.ADD (new mediatypeheadervalue ("text/html "));

Create entity classes such as:

     Public class UserInfo    {        publicstringgetset;}          Public string Get Set ; }    }

Open the Valuescontroller modify code as follows:

        // POST api/values         Public UserInfo Post ([frombody]userinfo value)        {            returnnew"a", pwd = value.pwd+"1 " };        }

You can open Fidder debugging until it succeeds:

Second, the introduction of Ali's Fastjson package

Just right-click to paste in:

This bag really works:

String json=json.tojsonstring (user);   //UserInfo userinfo=json.parseobject (json,userinfo.  Class);    // deserialization

The 2 sentences are all done.

Let's go ahead and create a new Java entity class:

Importjava.io.Serializable; Public classUserInfoImplementsserializable{PrivateString name;PrivateString pwd; PublicString getpwd () {returnpwd;} Public voidsetpwd (String pwd) { This. PWD =pwd;} PublicString GetName () {returnname;} Public voidsetName (String name) { This. Name =name;}}

Then modify the network access class, the last section is too shabby (see attached).

Then modify the async part code:

        protected string Doinbackground (String ... params)        {//                        UserInfo user=new  UserInfo ();            User.setname ("Mady");            User.setpwd ("123");                        String Str_json=json.tojsonstring (user);               return Httputils.sendpostmessage (params[0],str_json);        }

And the completion code:

        protected voidOnPostExecute (String result) {TextView lblinfo=(TextView) Findviewbyid (r.id.form_title); EditText Txt_login_name=(EditText) Findviewbyid (r.id.txt_login_name); EditText Txt_login_pass=(EditText) Findviewbyid (R.ID.TXT_LOGIN_PWD); String LoginName=Txt_login_name.gettext (). toString (). Trim (); String Loginpass=Txt_login_pass.gettext (). toString (). Trim (); UserInfo UserInfo=json.parseobject (Result,userinfo.class); if(Loginpass.equals (Userinfo.getpwd ()) &&loginname.equals (Userinfo.getname ())) {Lblinfo.settext ("Login Successful!" "); }            Else{Lblinfo.settext ("Login failed!" "); }          }

By this completion, there is no change in the unchanged.

Attach the new network access class:

 Public classhttputils{/**     * @paramServer URL address for path request *@paramencode encoded format *@returnconverts the data returned from the server side into a string*/     Public Staticstring Sendpostmessage (String path,string jsonstr) {string result= ""; HttpClient HttpClient=Newdefaulthttpclient (); Try{httppost HttpPost=Newhttppost (path); Httppost.addheader ("Content-type", "Text/json"); Httppost.setentity (Newstringentity (JSONSTR)); HttpResponse HttpResponse=Httpclient.execute (HttpPost); if(Httpresponse.getstatusline (). Getstatuscode () = =HTTPSTATUS.SC_OK) {//log.e ("json+++++2:", jsonstr); Log info for debugHttpentity httpentity =httpresponse.getentity (); if(Httpentity! =NULL) {result= Entityutils.tostring (httpentity, "UTF-8"); }            }        }        Catch(Exception e) {e.printstacktrace (); }        finally{Httpclient.getconnectionmanager (). Shutdown (); }                returnresult; }}

. NET Programmer Android Learning path 3:post data to the Web API