Android Legacy HTTP request Get----POST method submit data (contains garbled problem)

1. Imitate the login page display (using the traditional method is process-oriented)

Using the HttpClient API provided by Apache is an object-oriented

(To solve the problem of Chinese garbled, mainly in the Chinese data URL encoding)

The default encoding for Android phones is UTF-8

2. Mobile Demo

3. Server

The code is as follows:

Server-side code:

Test Android device Log in public class login extends HttpServlet {public void doget (HttpServletRequest request, HttpServletResponse response) throws Servletexception, IOException {String username = request.getparameter ("username") ; String Password = request.getparameter ("password");//encode data to solve garbled problem username  = new string (Username.getbytes (" Iso-8859-1 ")," UTF-8 "); System.out.println ("username--:" +username+ "---Password:" +password); if (Username.equals ("admin") && Password.equals ("123")) {Response.getoutputstream (). Write ("Login succeeded". GetBytes ("UTF-8"));} Else{response.getoutputstream (). Write ("Login failed". GetBytes ("UTF-8"));}} public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {// Request.setcharacterencoding ("UTF-8");d Oget (request, response);}

Android Client

Part of the layout file:

Test Android device Log in public class login extends HttpServlet {public void doget (HttpServletRequest request, HttpServletResponse response) throws Servletexception, IOException {String username = request.getparameter ("username") ; String Password = request.getparameter ("password");//encode data to solve garbled problem username  = new string (Username.getbytes (" Iso-8859-1 ")," UTF-8 "); System.out.println ("username--:" +username+ "---Password:" +password); if (Username.equals ("admin") && Password.equals ("123")) {Response.getoutputstream (). Write ("Login succeeded". GetBytes ("UTF-8"));} Else{response.getoutputstream (). Write ("Login failed". GetBytes ("UTF-8"));}} public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException {// Request.setcharacterencoding ("UTF-8");d Oget (request, response);}

Activity Code section:

(Note: After android4.0, access to the network must be accessed by a child thread, and permissions are involved, remember to add access to the network

In the following code, I write get and post two ways of threading requests ..... Slowly realize

）

public class Mainactivity extends Appcompatactivity {private static final int SUCCESS = 0;    private static final int faile = 1;    private static final int net_error = 3;    private static final String TAG = "mainactivity";    EditText Et_username;    EditText Et_password;    TextView Show_result;    String username;    String password;    Final String Path = "Http://188.188.7.85/Android_Server/Login"; Handler Handler = new Handler () {@Override public void Handlemessage (Message msg) {int = m            Sg.what;                    Switch (what) {case success:string data = (String) msg.obj;                    Show_result.settext (data);                Break                    Case FAILE:Toast.makeText (mainactivity.this, "Connection Server failed", Toast.length_short). Show ();                Break         Case NET_ERROR:Toast.makeText (mainactivity.this, "Network Exception", Toast.length_short). Show ();           Break            Default:break;    }        }    };        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        Et_username = (EditText) Findviewbyid (r.id.et_username);        Et_password = (EditText) Findviewbyid (R.id.et_password);        Show_result = (TextView) Findviewbyid (R.id.show_result);        Username = Et_username.gettext (). toString (). Trim ();    Password = Et_password.gettext (). toString (). Trim ();        public void Login (view view) {username = Et_username.gettext (). toString (). Trim ();        Password = Et_password.gettext (). toString (). Trim (); if (Textutils.isempty (username) | |            Textutils.isempty (password)) {Toast.maketext (this, "User name and password cannot be empty", Toast.length_short). Show ();        Return        }//Use the traditional get mode for the request server//New Thread_get (). Start (); Request server new Thread using the traditional post method_post (). Start ();                }//Traditional post mode request server-side class Thread_post extends Thread {@Override public void run () {try {                URL url = new URL (path);                HttpURLConnection conn = (httpurlconnection) url.openconnection ();                1. Set the request mode Conn.setrequestmethod ("POST"); Conn.setconnecttimeout (5000); The timeout event for setting the connection is 5 seconds//2. To combine data, be sure to URL-encode the data String commitdata = "Username=" +urlencoder.encode (user                Name, "UTF-8") + "&password=" +urlencoder.encode (password, "UTF-8"); 3. Specify Content-type-actually the data type of the specified transfer conn.setrequestproperty ("Content-type", "application/x-www-form-urlencoded")                ; 4. Specify Content-length content-length: Length of data conn.setrequestproperty ("Content-length", commitdata.length () +                "");                5. Open the output stream and tell the server that I want to write the data conn.setdooutput (TRUE); 6. Start writing data outputstream OS = conn.geToutputstream ();                Os.write (Commitdata.getbytes ());//Os.close ();  int code = Conn.getresponsecode ();                Gets the success code returned by LOG.I (TAG, "code:---" + code); if (code = = 200) {//indicates that the connection server successfully returned the message String data = Servertools.getinfo (conn.getinputst                    Ream ());                    LOG.I (TAG, "Data:---" + data);                    Use the message processing mechanism to pass data to the main thread message ms = new Message ();                    Ms.what = SUCCESS;                    Ms.obj = data;                Handler.sendmessage (MS);                    } else {//uses a message processing mechanism to pass data to the main thread message ms = new Message ();                    Ms.what = Faile;                Handler.sendmessage (MS);                }} catch (Exception e) {//Use the message processing mechanism to pass data to the main thread message ms = new Message ();                Ms.what = Net_error; Handler.sendmessage (MS);               E.printstacktrace ();            }}}//Traditional Get mode Request server-side class Thread_get extends Thread {@Override public void run () { try {String GetPath = path + "? Username=" + urlencoder.encode (username, "utf-                8 ") +" &password= "+ urlencoder.encode (password," UTF-8 ");                URL url = new URL (getpath);                HttpURLConnection conn = (httpurlconnection) url.openconnection ();                Conn.setrequestmethod ("GET"); Conn.setconnecttimeout (5000);  The timeout event for setting the connection is 5 seconds int code = Conn.getresponsecode ();                Gets the success code returned by LOG.I (TAG, "code:---" + code);                ; if (code = = 200) {//indicates that the connection server successfully returned the message String data = Servertools.getinfo (conn.getinputst                    Ream ());                    LOG.I (TAG, "Data:---" + data); Use the message processing mechanism to pass data to the main thread message ms = New Message ();                    Ms.what = SUCCESS;                    Ms.obj = data;                Handler.sendmessage (MS);                    } else {//uses a message processing mechanism to pass data to the main thread message ms = new Message ();                    Ms.what = Faile;                Handler.sendmessage (MS);                }} catch (Exception e) {//Use the message processing mechanism to pass data to the main thread message ms = new Message ();                Ms.what = Net_error;                Handler.sendmessage (MS);            E.printstacktrace (); }        }    }}

Tool class:

public class Servertools {    //Get stream data from server to convert to text file public    static String GetInfo (InputStream in) {        //write data stream in memory        Bytearrayoutputstream RAF = new Bytearrayoutputstream ();        String data = null;        try{            byte[] bt = new byte[1024];            int Len =0;            while (len = In.read (BT))! =-1) {                raf.write (Bt,0,len);            }           data = Raf.tostring ();        } catch (Exception e) {            e.printstacktrace ();        }        return data;}    }

The source code for Android is already on GitHub:

Traditional way Demo Address: Https://github.com/momxmo/HTTP_get_post

Apache provides an object-oriented approach to the HttpClient API Demo:https://github.com/momxmo/httpclient_get_post



Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Android Legacy HTTP request Get----POST method submit data (contains garbled problem)