About file Upload Download

Previous beta server upload downloaded demo test can optimize the code by being interested in uploading and downloading

public static Boolean uploadfile (file file, String URL) {

String CHARSET = "Utf-8";

Boolean upload = false;

FileInputStream FIS = null;

URL murl = null;

HttpURLConnection conn = null;

String boundary = Uuid.randomuuid (). toString (); Random generation of boundary markers

String PREFIX = "--", Line_end = "\ r \ n";

String content_type = "Multipart/form-data"; Content Type

try {

murl = new URL (URL);

conn = (httpurlconnection) murl.openconnection ();

Conn.setreadtimeout (5000); //

Conn.setconnecttimeout (5000);

Conn.setdoinput (TRUE); Allow input stream

Conn.setdooutput (TRUE); Allow output stream

Conn.setusecaches (FALSE); Caching is not allowed

Conn.setrequestmethod ("POST"); Request method

Conn.setrequestproperty ("Charset", Charset); Set encoding

Conn.setrequestproperty ("Connection", "keep-alive");

Conn.setrequestproperty ("Content-type", Content_Type + "; boundary=" + boundary);

if (file = null) {/** * files are not empty, package and upload the file */

DataOutputStream dos = new DataOutputStream (Conn.getoutputstream ());

StringBuffer sb = new StringBuffer ();

Sb.append (PREFIX); Sb.append (boundary);

Sb.append (Line_end);

/** * Note here: The value inside the name is the server side need key only this key can get the corresponding file * filename is the name of the file, including the suffix name, such as: Abc.png */

Sb.append ("Content-disposition:form-data; Name=\ "File\"; Filename=\ "" + file.getname () + "\" "+ line_end);

Sb.append ("Content-type:application/octet-stream; Charset= "+ charset + line_end);

Sb.append (Line_end); Dos.write (Sb.tostring (). GetBytes ());

InputStream is = new FileInputStream (file);

byte[] bytes = new byte[1024];

int len = 0; int send=0;

while (len = is.read (bytes))! =-1) {

System.out.println ("len:" + len);

Dos.write (bytes, 0, Len);

Send+=len; Dos.flush ();

}

Is.close ();

Dos.write (Line_end.getbytes ());

Byte[] End_data = (PREFIX + boundary + PREFIX + line_end). GetBytes ();

Dos.write (End_data); Dos.flush ();

/** * Get response code 200 = Success When the response succeeds, gets the stream of the response */

int res = Conn.getresponsecode ();

if (res = = 200) {

InputStream input = Conn.getinputstream ();

StringBuffer sb1 = new StringBuffer ();

int SS;

while (ss = Input.read ())! =-1) {

Sb1.append ((char) SS);

}

Upload = true;

}

}

} catch (Malformedurlexception e) {e.printstacktrace ();   } catch (IOException e) {e.printstacktrace ();  } return upload; }

About file Upload Download