Getting Data From the Web (URLConnection via http)

最新推荐文章于 2019-02-27 21:29:00 发布

iteye_7441

最新推荐文章于 2019-02-27 21:29:00 发布

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Getting Data From the Web (URLConnection via http)

What you will learn:You will learn how to download files/data from any URL (useful for reading the returned xml-data from Web2.0-APIs)

Problems/Questions:Write it right below...

Difficulty:1.5 of 5 Smile

What it will look like:

Description:
0.)We will use justURL,URLConnectionandInputStreamsto receive data from a txt-file via http from the web. (works with any other dynamic url, too Exclamation like the Google Weather APIhttp://www.google.com/ig/api?weather=Schriesheim,Germany)

This is the full Code:

Java:

packageorg. anddev. android. getdatafromtheweb;

importjava. io. BufferedInputStream;
importjava. io. InputStream;
importjava. net. URL;
importjava. net. URLConnection;

importorg. apache. http. util. ByteArrayBuffer;

importandroid. app. Activity;
importandroid. os. Bundle;
importandroid. widget. TextView;

public classGetDataFromTheWeb extendsActivity {
@Override
public voidonCreate (Bundle icicle ) {
super. onCreate (icicle );

/* We will show the data we read in a TextView. */
TextView tv = newTextView ( this );

/* Will be filled and displayed later. */
StringmyString = null;
try {
/* Define the URL we want to load data from. */
URLmyURL = new URL (
"http://www.anddev.org/images/tut/basic/getdatafromtheweb/loadme.txt" );
/* Open a connection to that URL. */
URLConnectionucon = myURL. openConnection ( );

/* Define InputStreams to read
* from the URLConnection. */
InputStreamis = ucon. getInputStream ( );
BufferedInputStreambis = new BufferedInputStream (is );

/* Read bytes to the Buffer until
* there is nothing more to read(-1). */
ByteArrayBuffer baf = newByteArrayBuffer ( 50 );
intcurrent = 0;
while ( (current = bis. read ( ) )!= -1 ) {
baf. append ( ( byte )current );
}

/* Convert the Bytes read to a String. */
myString = new String (baf. toByteArray ( ) );
} catch ( Exceptione ) {
/* On any Error we want to display it. */
myString = e. getMessage ( );
}
/* Show the String on the GUI. */
tv. setText (myString );
this. setContentView (tv );
}
}