Getting Data From the Web (URLConnection via http)

最新推荐文章于 2019-10-14 19:17:31 发布

hqx2008

最新推荐文章于 2019-10-14 19:17:31 发布

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分类专栏： Android Web 文章标签： web download url buffer google string

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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 just URL, URLConnection and InputStreams to receive data from a txt-file via http from the web. (works with any other dynamic url, too Exclamation like the Google Weather API http://www.google.com/ig/api?weather=Schriesheim,Germany )

This is the full Code:

Java:

package org. anddev. android. getdatafromtheweb;

import java. io. BufferedInputStream;
import java. io. InputStream;
import java. net. URL;
import java. net. URLConnection;

import org. apache. http. util. ByteArrayBuffer;

import android. app. Activity;
import android. os. Bundle;
import android. widget. TextView;

public class GetDataFromTheWeb extends Activity {
@Override
public void onCreate (Bundle icicle ) {
super. onCreate (icicle );

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

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

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

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

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