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Java > Java SE, EE, ME > java > net > HttpURLConnection

java.net
Class HttpURLConnection

java.lang.Object
  extended by java.net.URLConnection
      extended by java.net.HttpURLConnection
Direct Known Subclasses:
HttpsURLConnection
See Also:
Top Examples, Source Code, disconnect()
protected int chunkLength
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public abstract void disconnect()
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[70]Http PUT
By Anonymous on 2005/08/09 20:13:39  Rate
try  {  
   URL u = new URL ( "http://www.KickJava.com/" ) ; 
   HttpURLConnection huc =  ( HttpURLConnection )  u.openConnection (  ) ; 
   huc.setRequestMethod ( "PUT" ) ; 
   huc.connect (  ) ; 
   OutputStream os = huc.getOutputStream (  ) ; 
   int code = huc.getResponseCode (  ) ; 
   if  ( code  > = 200 &&  <  300 )   {   
    // put the data... 
    }  
   huc.disconnect (  ) ; 
  }  
 catch  ( IOException e )   {  //... 
 
protected int fixedContentLength
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[1745]Downloading files with HttpURLConnection
By Jos?? Antonio ??lvarez Ruiz on 2006/04/22 20:34:07  Rate
/** 
    Downloads a file given it's URL as argument 
    @author Jose Antonio Alvarez Ruiz 
    Use this code as you wish 
 */ 
 import java.net.*; 
 import java.io.*; 
  
  
 public class DownloadTest {  
     /** Sole Constructor 
   @param dir The URL of the file we want to download 
      */ 
     DownloadTest ( String dir )  {  
   /*replace the spaces with %20, so we codify the given address to URL's format*/ 
   dir = dir.replace ( " ","%20" ) ; 
   try  {  
       URL u = new URL ( dir ) ; 
       HttpURLConnection huc =  ( HttpURLConnection )  u.openConnection (  ) ; 
       /*GET will be our method to download a file*/ 
       huc.setRequestMethod ( "GET" ) ; 
       /*Stablishing the connection*/ 
       huc.connect (  ) ; 
       /*We replace the %20 of the URL with spaces, and retrive the file's name*/ 
       dir = dir.replaceAll ( "%20","" ) ; 
       String [  ]  tokens = dir.split ( "/" ) ; 
       String fileName = tokens [ tokens.length -1 ] ; 
       /*The filename we are going to use*/ 
       /*Input stream to read from our connection*/ 
       InputStream is = huc.getInputStream (  ) ; 
       /* the response code returned by the request*/ 
       int code = huc.getResponseCode (  ) ; 
       /*The served agreed to send us the file*/ 
       if  ( code == HttpURLConnection.HTTP_OK )   {  
     /*we make a 4 Kb buffer to accelerate the download, instead of reading the file a byte at once*/ 
     byte [  ]  buffer = new byte [ 4096 ] ; 
     File output = new File ( fileName ) ; 
       /*we make an output stream to the we want to write in*/ 
     FileOutputStream outputStream= new FileOutputStream ( output ) ; 
     System.out.println ( "Ready to download " + fileName +" " + huc.getContentLength (  )  + " bytes" ) ; 
     /*How many bytes do we have already downloaded*/ 
     int totBytes,bytes,sumBytes = 0; 
     totBytes = huc.getContentLength (  ) ; 
     while  ( true )  {  
         /*How many bytes we got*/ 
         bytes = is.read ( buffer ) ; 
         /*If no more byte, we're done with the download*/ 
         if  ( bytes  < = 0 )  break;       
         sumBytes+= bytes; 
         outputStream.write ( buffer,0,bytes ) ;        
         System.out.println ( sumBytes + " of " + totBytes + " " + (  ( float ) sumBytes/ ( float ) totBytes ) *100 + "% done" ) ; 
      }  
     /*we close the file*/ 
     outputStream.close (  ) ; 
        }  
       huc.disconnect (  ) ; 
    }  
   catch  ( IOException e )   {   
        
       System.out.println ( "Exception\n" + e ) ; 
    }  
      }  
     public static void main ( String args [  ]  )  {  
   if  ( args.length != 1 )  {  
       System.out.println ( "You have to provide an URL as argument" ) ; 
       System.exit ( 1 ) ; 
    }  
   DownloadTest t = new DownloadTest ( args [ 0 ]  ) ; 
      }  
  } 
public InputStream getErrorStream()
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public static boolean getFollowRedirects()
See Also:
setFollowRedirects(boolean)
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public String getHeaderField(int n)
See Also:
getHeaderFieldKey(int), URLConnection
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public long getHeaderFieldDate(String name,
                               long Default)
See Also:
URLConnection
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public String getHeaderFieldKey(int n)
See Also:
URLConnection, getHeaderField(0)
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public boolean getInstanceFollowRedirects()
See Also:
setInstanceFollowRedirects(boolean), instanceFollowRedirects
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public Permission getPermission()
                         throws IOException
See Also:
URLConnection
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public String getRequestMethod()
See Also:
setRequestMethod(java.lang.String)
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public int getResponseCode()
                    throws IOException
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[1563]Http connect via proxy
By Anonymous on 2005/10/07 10:36:52  Rate
String url = "http://www.kickjava.com/", 
        proxy = "myProxy", 
        port = "8080"; 
  
  
 URL server = new URL ( url ) ; 
 Properties systemProperties = System.getProperties (  ) ; 
 systemProperties.setProperty ( "http.proxyHost",proxy ) ; 
 systemProperties.setProperty ( "http.proxyPort",port ) ; 
 HttpURLConnection connection =  ( HttpURLConnection ) server.openConnection (  ) ; 
  
  
 if  ( HttpURLConnection.HTTP_OK != connection.getResponseCode (  )  )   {  
   //do something ... 
  }  
  
  
 
public String getResponseMessage()
                          throws IOException
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protected HttpURLConnection(URL u)
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public static final int HTTP_ACCEPTED
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public static final int HTTP_BAD_GATEWAY
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public static final int HTTP_BAD_METHOD
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public static final int HTTP_BAD_REQUEST
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public static final int HTTP_CLIENT_TIMEOUT
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public static final int HTTP_CONFLICT
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public static final int HTTP_CREATED
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public static final int HTTP_ENTITY_TOO_LARGE
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public static final int HTTP_FORBIDDEN
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public static final int HTTP_GATEWAY_TIMEOUT
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public static final int HTTP_GONE
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public static final int HTTP_INTERNAL_ERROR
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public static final int HTTP_LENGTH_REQUIRED
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public static final int HTTP_MOVED_PERM
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public static final int HTTP_MOVED_TEMP
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public static final int HTTP_MULT_CHOICE
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public static final int HTTP_NOT_ACCEPTABLE
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public static final int HTTP_NOT_AUTHORITATIVE
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public static final int HTTP_NOT_FOUND
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public static final int HTTP_NOT_IMPLEMENTED
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public static final int HTTP_NOT_MODIFIED
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public static final int HTTP_NO_CONTENT
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public static final int HTTP_OK
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[510]Check if file (by http/url) exists
By Anonymous on 2004/01/21 07:42:45  Rate
  // check if file  ( by http/url )  exists pb20031114   
   static boolean fileExists ( String name )  
    {  
     boolean fileIsThere = false; 
     java.net.HttpURLConnection huc = null; 
         try  
          {  
           java.net.URL myURI = new java.net.URL ( name ) ; 
  
  
             huc =  ( java.net.HttpURLConnection )  myURI.openConnection (  ) ;  
             huc.setRequestMethod ( "HEAD" ) ;  
             huc.connect (  ) ;  
              
             if  ( huc.getResponseCode (  ) ==java.net.HttpURLConnection.HTTP_OK )  
                 fileIsThere = true; 
                  
          }  
         catch  ( Exception e )  
          {  
          }  
         finally 
          {  
             try  {  huc.disconnect (  ) ;  }  catch  ( Exception e )   {  }  
          }  
  
  
         return fileIsThere; 
    }  
 

[2007]Correction
By mej1960 { at } yahoo { dot } com on 2010/02/15 10:26:50  Rate
The given sample code allegedly showing if the file exists is incorrect. 
  
  
 For example, running the code with the URL "http://wap.yahoo.com" 
 claims the file does not exist. But it does exist. For whatever reason, 
 Yahoo! returns not HTTP_OK=200 but 500  ( internal server )  error 
 for this URL if you try to execute the HEAD method.
public static final int HTTP_PARTIAL
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public static final int HTTP_PAYMENT_REQUIRED
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public static final int HTTP_PRECON_FAILED
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public static final int HTTP_PROXY_AUTH
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public static final int HTTP_REQ_TOO_LONG
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public static final int HTTP_RESET
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public static final int HTTP_SEE_OTHER
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@Deprecated
public static final int HTTP_SERVER_ERROR
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public static final int HTTP_UNAUTHORIZED
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public static final int HTTP_UNAVAILABLE
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public static final int HTTP_UNSUPPORTED_TYPE
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public static final int HTTP_USE_PROXY
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public static final int HTTP_VERSION
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protected boolean instanceFollowRedirects
See Also:
setFollowRedirects(boolean), getInstanceFollowRedirects(), setInstanceFollowRedirects(boolean)
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protected String method
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protected int responseCode
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protected String responseMessage
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public void setChunkedStreamingMode(int chunklen)
See Also:
setFixedLengthStreamingMode(int), IllegalStateException
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public void setFixedLengthStreamingMode(int contentLength)
See Also:
setChunkedStreamingMode(int), IllegalArgumentException, IllegalStateException
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public static void setFollowRedirects(boolean set)
See Also:
getFollowRedirects(), SecurityManager.checkSetFactory(), SecurityException
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public void setInstanceFollowRedirects(boolean followRedirects)
See Also:
getInstanceFollowRedirects(), instanceFollowRedirects
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public void setRequestMethod(String method)
                      throws ProtocolException
See Also:
getRequestMethod()
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public abstract boolean usingProxy()
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