Android uses post to submit data to the server

Then, "Android uses get to submit data to the server," this article to implement the Post method to submit data to the server

First, compare the Get mode and post mode:

To modify a layout:

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Tools:context=". Mainactivity " >    <EditTextAndroid:id= "@+id/et_name"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "Please enter user name"Android:inputtype= "text" />    <EditTextAndroid:id= "@+id/et_pwd"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:hint= "Please enter password"Android:inputtype= "Textpassword" />    <ButtonAndroid:onclick= "Loginbyget"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:text= "Get mode login"        />     <ButtonAndroid:onclick= "Loginbypost"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:text= "Post Mode login"        /></LinearLayout>

Add code:

 Packagecom.wuyudong.loginclient;ImportJava.io.ByteArrayOutputStream;ImportJava.io.InputStream;Importjava.net.HttpURLConnection;ImportJava.net.URL;ImportAndroid.os.Build;ImportAndroid.os.Bundle;ImportAndroid.os.StrictMode;ImportAndroid.annotation.SuppressLint;ImportAndroid.annotation.TargetApi;Importandroid.app.Activity;Importandroid.text.TextUtils;ImportAndroid.view.View;ImportAndroid.widget.EditText;ImportAndroid.widget.Toast; Public classMainactivityextendsActivity {PrivateEditText Et_name; PrivateEditText et_pwd; protected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Et_name=(EditText) Findviewbyid (r.id.et_name); Et_pwd=(EditText) Findviewbyid (R.ID.ET_PWD); Strictmode.threadpolicy Policy=NewStrictMode.ThreadPolicy.Builder (). Permitall (). build ();    Strictmode.setthreadpolicy (Policy); }     Public voidloginbyget (view view) {String name=Et_name.gettext (). toString (). Trim (); String pwd=Et_pwd.gettext (). toString (). Trim (); if(Textutils.isempty (name) | |Textutils.isempty (PWD)) {Toast.maketext ( This, "User name password cannot be empty", 0). Show (); } Else {            //impersonate an HTTP request, submit data to the serverString Path = "Http://169.254.168.71:8080/web/LoginServlet?username=" + name + "&password=" +pwd; Try{URL URL=NewURL (path); //2. Establish an HTTP connectionHttpURLConnection conn =(httpurlconnection) URL. OpenConnection (); //3. Set up some request methodsConn.setrequestmethod ("GET");//Note get word captions must be capitalizedConn.setrequestproperty ("User-agent",                        "mozilla/5.0 (Windows NT 6.1; WOW64) applewebkit/537.36 (khtml, like Gecko) chrome/45.0.2454.101 safari/537.36 "); intCode = Conn.getresponsecode ();//the server's response code is OK//404 Page Not Found// //503 Server Internal Error                if(Code = = 200) {InputStream is=Conn.getinputstream (); //Convert the content of is to a stringBytearrayoutputstream BOS =NewBytearrayoutputstream (); byte[] buffer =New byte[1024]; intLen =-1;  while(len = is.read (buffer))! =-1) {bos.write (buffer,0, Len); The String result=NewString (Bos.tobytearray ());                    Is.close (); Toast.maketext ( This, result, 0). Show (); } Else{Toast.maketext ( This, "request failed, reason for failure:" + code, 0). Show (); }            } Catch(Exception e) {e.printstacktrace (); Toast.maketext ( This, "The request failed, please check the Logcat log console", 0). Show (); }        }    }    /*** Submit data to Server using Post * *@paramView*/     Public voidloginbypost (view view) {String name=Et_name.gettext (). toString (). Trim (); String pwd=Et_pwd.gettext (). toString (). Trim (); if(Textutils.isempty (name) | |Textutils.isempty (PWD)) {Toast.maketext ( This, "User name password cannot be empty", 0). Show (); } Else {            Try{String path= "Http://169.254.168.71:8080/web/LoginServlet?username=" + name + "&password=" +pwd; //1. Defining the request URLURL url =NewURL (path); //2. Establish an HTTP connectionHttpURLConnection conn =(httpurlconnection) URL. OpenConnection (); //3. Set parameters for some requestsConn.setrequestmethod ("POST"); Conn.setrequestproperty ("User-agent",                        "mozilla/5.0 (Windows NT 6.1; WOW64) applewebkit/537.36 (khtml, like Gecko) chrome/45.0.2454.101 safari/537.36 "); Conn.setrequestproperty ("Content-type",                        "Application/x-www-form-urlencoded"); String Data= "Username=" + name + "&password=" +pwd; Conn.setrequestproperty ("Content-length", data.length () + ""); Conn.setconnecttimeout (5000);//Setting the connection time-out periodConn.setreadtimeout (5000);//set the Read timeout time//4. Be sure to remember to set the data stream to the serverConn.setdooutput (true);//set up to write data to the serverConn.getoutputstream (). Write (Data.getbytes ()); intCode = Conn.getresponsecode ();//the server's response code is OK//404 Page Not Found// //503 Server Internal Error                if(Code = = 200) {InputStream is=Conn.getinputstream (); //Convert the content of is to a stringBytearrayoutputstream BOS =NewBytearrayoutputstream (); byte[] buffer =New byte[1024]; intLen =-1;  while(len = is.read (buffer))! =-1) {bos.write (buffer,0, Len); The String result=NewString (Bos.tobytearray ());                    Is.close (); Toast.maketext ( This, result, 0). Show (); } Else{Toast.maketext ( This, "request failed, reason for failure:" + code, 0). Show (); }            } Catch(Exception e) {e.printstacktrace (); Toast.maketext ( This, "The request failed, please check the Logcat log console", 0). Show (); }        }    }}

Android uses post to submit data to the server