Android--http protocol

 1 package com.http.get; 2 3 Import Java.io.FileOutputStream; 4 Import java.io.IOException; 5 Import Java.io.InputStream; 6 Import java.net.HttpURLConnection; 7 Import java.net.MalformedURLException; 8 Import Java.net.URL;      9 public class Httputils {One private static String Url_path = "http://192.168.1.106:8080/green.jpg"; 12/**13 * @param args14 */15 public static void Main (string[] args) {16//call method get picture and save it Saveimagetodi         SK (); 18}19/**20 * Access pictures via Url_path's address and save to local */22 public static void Saveimagetodisk () 23 {24 InputStream inputstream= getInputStream (); byte[] data=new byte[1024];26 int len=0;27 File OutputStream fileoutputstream=null;28 try {29//To save the picture file in the local F-disk fileoutputstream=new Fileo Utputstream ("F:\\test.png"); (Len=inputstream.read (data)!=-1) 32 {33// To write a picture stream in a file FileOutputStream. write (Data,0,len);         }36} catch (IOException e) {PNS e.printstacktrace ();}39 finally40                     {41//Last Close stream if (inputstream!=null), {45                 Inputstream.close (); IOException} catch (e) {e.printstacktrace (); 48                     }49}50 if (fileoutputstream!=null) {53 Fileoutputstream.close (); IOException} catch (e) {e.printstacktrace (); 5 6}57}58}59}60/**61 * get pictures by URL * @return The input stream of the URL address picture. */64 public static InputStream getInputStream () {InputStream InputStream = null;66 HTTPURLC Onnection httpurlconnection = null;67-try {69//) instantiate a URL object based on the URL address for creating the HttpURLConnection object.    70         URL url = new URL (url_path); (URL! = null) {//openconnection Gets the connection to the current URL 74                 HttpURLConnection = (httpurlconnection) url.openconnection (); 75//Set 3-second response Timeout 76 Httpurlconnection.setconnecttimeout (3000); 77//Set allow input of httpurlconnection.setdoinput (tr UE); 79//Set to get method request data Httpurlconnection.setrequestmethod ("get"); 81//Get Connected The response code, 200 for the success, if for the other, are indicated to have the problem of the Responsecode=httpurlconnection.getresponsecode int (); onsecode==200) (//getinputstream) The data stream returned by the server is obtained. Inputstream=httpurlconnection.getinputstream (); 87}88}89 90} catch (Malformedurlexception e) {e.printstacktrace (); catch (IOException e) {E.P Rintstacktrace (); 94}95 return inputstream;96     }97 98} 

Post mode

This example accesses a login page via post, requiring a username (username) and password (password). Although the Java used here is explaining the problem, the server is used. NET Framework, a very simple HTML page plus a form to send the general handler, input for admin+123 for landing success, here not tired of.

Java code:

  1 package com.http.post;  2 3 Import Java.io.ByteArrayOutputStream;  4 Import java.io.IOException;  5 Import Java.io.InputStream;  6 Import Java.io.OutputStream;  7 Import java.io.UnsupportedEncodingException;  8 Import java.net.HttpURLConnection; 9 Import Java.net.URL; Ten import Java.net.URLEncoder; Import Java.util.HashMap; Import Java.util.Map; public class Postutils {p. private static String PATH = "Http://192.168.222.1:1231/loginas.ashx"; rivate static URL url;  Public Postutils () {$} static {$ try {% URL = new URL (PATH); 24} catch (Exception e) {e.printstacktrace (); 26} 27} 28 29/** 30 * via given request parameters and encoding Format, gets the data returned by the server * @param params request parameter * @param encode encoded format * @return the string received by * */Public static string Sendpostmessage (Map<string, string> params, string encode) {Notoginseng StringBuffer bu Ffer = New StringBuffer (); if (params = null &&!params.isempty ()) {map.entry<string, string> Entry:                             Params.entryset ()) {try {buffer.append (Entry.getkey ()) 42                             . Append ("=") Append (Urlencoder.encode (Entry.getvalue (), encode)) 44 . Append ("&");//Use & split between the requested parameters.                 (Unsupportedencodingexception e) {e.printstacktrace (); 47 } Buffer.deletecharat (Buffer.length ()-1); Wuyi System.out.println (buffer.tostring ());                         HttpURLConnection URLConnection = (httpurlconnection) URL 54 . OpenConnection (); Urlconnection.setconnecttimeout (3000); 56//Set allow input/output urlconnection.setdoinput (TRUE); The URlconnection.setdooutput (TRUE); byte[] MyData = buffer.tostring (). GetBytes ();                         60//Set Request packet header, set request data type Urlconnection.setrequestproperty ("Content-type", 62 "application/x-www-form-urlencoded");                         63//Set Request data length Urlconnection.setrequestproperty ("Content-length", 65 String.valueof (mydata.length)); 66//Set POST method request data Urlconnection.setrequestmethod ("POST"); OutputStream outputstream = Urlconnection.getoutputstream (); Outputstream.write (MyData); responsecode int = Urlconnection.getresponsecode (); if (Responsecode = =) {Changeinputstream return (urlconnection.getinputstream (), encode);            (IOException e) {e.printstacktrace (); 77 } ""; 80} 81 82/** 83 * Convert the input stream returned by the server into a string format. * @param the input streams returned by the InputStream servers. * @param encode encoding format 8             6 * @return Parsed string, */InputStream InputStream, 89 String encode) {Bytearrayoutputstream outputstream = new Bytearrayoutputstream (); byte[] data = n EW byte[1024]; an int len = 0; result= String "";  94 if (InputStream! = null) {up-try {(len = inputstream.read (data))! =-1)                     {Outputstream.write (Data,0,len);             98} result=new String (Outputstream.tobytearray (), encode); 100 101 } catch (IOException e) {102 e.printstacktrace (); 103}104}105 return R esult;106}107 108/**109 * @param args110 */111 public static void Main (string[] args) {112//sets the request string via map. 113 map<string, string> params = new hashmap<string, string> (), Params.put ("username", "adm        In "); Params.put (" Password "," 123 "); Result=sendpostmessage String (params, "utf-8"); 117 System.out.println (result); 118}119 120}

Android--http Protocol