An example of a simple Android +servlet image upload

The example is simple, the server is the Java Web Servlet,dopost method to receive pictures and save, and then return the saved picture name to the client, the key code:

@SuppressWarnings ("deprecation") public void DoPost (HttpServletRequest request, httpservletresponse response) throws  Servletexception, IOException {request.setcharacterencoding ("utf-8");          Set encode//Get Disk File entry Factory Diskfileitemfactory factory = new Diskfileitemfactory ();          Gets the path that the file needs to be uploaded to String path = Request.getrealpath ("/upload");        File File=new file (path);        if (!file.exists ()) {file.mkdirs ();          } factory.setrepository (new File path);          Sets the size of the cache Factory.setsizethreshold (1024*1024);          File upload processing servletfileupload upload = new Servletfileupload (factory);               try {//can upload multiple files list<fileitem> List = (list<fileitem>) upload.parserequest (request);                  for (Fileitem item:list) {//Gets the property name String name = Item.getfieldname ();                    If the obtained form information is plain text information if (Item.isformfield ()) {                     Gets the user-specific input string, because the form submits a string of type value = Item.getstring ();                  Request.setattribute (name, value);                      }else{//Gets the path name String value = Item.getname ();                      Index to the last backslash int start = value.lastindexof ("\ \");                      Intercept the string name of the uploaded file, plus 1 to remove the backslash, string filename = value.substring (start+1);                      Request.setattribute (name, filename); Write to Disk item.write (path,filename);//SYSTEM.OUT.PRINTLN provided by the third party ("Upload succeeded:                    "+filename);  Response.getwriter (). Print (filename),//return path to the client}}} catch (Exception        e) {System.out.println ("Upload failed");        Response.getwriter (). Print ("Upload failed:" +e.getmessage ()); }  }

This method is also applicable to Web-page image upload, not the focus of this article, not explained.

Client-side Key code:

/** * File Upload * * @param urlstr interface path * @param filePath local picture path * @return */public static string Formupload (String urlstr, Str ing FilePath) {String RSP = ""; HttpURLConnection conn = null; String boundary = "|"; Request header and upload file content delimiter try {URL url = new URL (URLSTR); conn = (httpurlconnection) url.openconnection (); Conn.setconnecttimeout, Conn.setreadtimeout (30000); Conn.setdooutput (true); Conn.setdoinput (true); Conn.setusecaches (false); Conn.setrequestmethod ("POST"), Conn.setrequestproperty ("Connection", "keep-alive"); Conn.setrequestproperty ("User-agent", "mozilla/5.0" (Windows; U Windows NT 6.1; ZH-CN; rv:1.9.2.6) Conn.setrequestproperty ("Content-type", "multipart/form-data; boundary=" + boundary); OutputStream out = New DataOutputStream (Conn.getoutputstream ()); File File = new file (FilePath); String filename = File.getname (); String ContentType = "", if (Filename.endswith (". png")) {ContentType = "image/png";} if (Filename.endswith (". jpg")) {ContentType = "image/jpg";} if (Filename.endswith (". gif")) {ContentType = "Image/gif";} if (Filename.endswith (". bmp")) {ContentType = "image/bmp";} if (ContentType = = NULL | | contenttype.equals ("")) {ContentType = "Application/octet-stream";} StringBuffer strbuf = new StringBuffer () strbuf.append ("\ r \ n"). Append ("--"). Append (Boundary). Append ("\ r \ n"); Strbuf.append ("Content-disposition:form-data; Name=\ "" + filepath+ "\"; Filename=\ "+ filename +" \ "\" \ \ "\ \ \") Strbuf.append ("Content-type:" + contentType + "\r\n\r\n"); Out.write ( Strbuf.tostring (). GetBytes ());D atainputstream in = new DataInputStream (new FileInputStream (file)); int bytes = 0;byte[] Bufferout = new Byte[1024];while ((bytes = In.read (bufferout))! =-1) {out.write (bufferout, 0, bytes);} In.close (); byte[] Enddata = ("\r\n--" + boundary + "--\r\n"). GetBytes (); Out.write (Enddata); Out.flush (); Out.close ();// Read return data StringBuffer buffer = new StringBuffer (); BufferedReader reader = new BufferedReader (New InputStreamReader (Conn.getinputstream (), "Utf-8")); String line = null;while (line = Reader.readline ()) = null) {Buffer.append (line). append ("\ n");} RSP = Buffer.tostring (); Reader.close (); reader = null;} catch (Exception e) {e.printstacktrace ();} finally {if (conn! = null) {conn.disconnect (); conn = null;}} return RSP;}

Service-side legend:

Client legend:

Note: When testing, please write the full native LAN IP address on the client:

/** * Image upload path */public static final String upload_url= "Http://192.168.1.188:8080/uploadImage/UploadServlet";/** * Picture Download path */public static final String download_url= "http://192.168.1.188:8080/uploadImage/upload/";

Source Address: http://download.csdn.net/detail/baiyuliang2013/8714775

An example of a simple Android +servlet image upload