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Web page reader example
Here is the example of the WebPageReader class with its method readWebPage().
In the example we create a URL object from a URL string, such as "http://gmail.com".
After creating a URL object we use its openStream() method to create an InputStream. Then we engage a usual scenario of using Input streams by creating a proper input stream for proper type of information.
In this case to read a web page, which is html/text by its nature, we create a BufferedReader stream out of InputStream.
Then we read line by line in a loop and add each line to our html string.
package its.day16.http;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
/**
* The WebReader reads web pages base on provided URL
* @author Jeff.Zhuk@Javaschool.com
*
*/
public class WebReader {
/**
* The readWebPage() method reads a web page based on a provided URL
* @param urlString
* @return html web page
* @throws Exception
*/
public String readWebPage(String urlString) throws Exception {
URL url = new URL(urlString);
String html = "";
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
for (String inputLine = null; (inputLine = in.readLine()) != null; ) {
html += inputLine + System.lineSeparator();
}
in.close();
return html;
}
/**
* The main() method will test the
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
WebReader webReader = new WebReader();
String html = webReader.readWebPage("http://gmail.com");
System.out.println(html);
}
}
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Assignments: 1. Open Eclipse and navigate to the project week7.network.
2. Open the project to see the src directory.
3. Right click on the src directory – NEW – Package its.day16.http 4. Right click on this new package and create – NEW – Class - WebPageReader 5. Type the source above into the class.
6. Right mouse click on the source – Run – As Java Application
7. You will see in the Console an html source of the target page.
8. Change the target page to another web URL, starting with http://.
9. Run this application again and see the result in the Console.
We invite you to create your own questions and answers (QnA) to increase your rank and win the Top Creativity Prize!
<br/>package its.day16.http;
<br/>
<br/>import java.io.BufferedReader;
<br/>import java.io.InputStreamReader;
<br/>import java.net.URL;
<br/>/**
<br/> * The WebReader reads web pages base on provided URL
<br/> * @author Jeff.Zhuk@Javaschool.com
<br/> *
<br/> */
<br/>public class WebReader {
<br/> /**
<br/> * The readWebPage() method reads a web page based on a provided URL
<br/> * @param urlString
<br/> * @return html web page
<br/> * @throws Exception
<br/> */
<br/> public String readWebPage(String urlString) throws Exception {
<br/> URL url = new URL(urlString);
<br/> String html = "";
<br/> BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
<br/> for (String inputLine = null; (inputLine = in.readLine()) != null; ) {
<br/> html += inputLine + System.lineSeparator();
<br/> }
<br/> in.close();
<br/> return html;
<br/> }
<br/> /**
<br/> * The main() method will test the
<br/> * @param args
<br/> * @throws Exception
<br/> */
<br/> public static void main(String[] args) throws Exception {
<br/> WebReader webReader = new WebReader();
<br/> String html = webReader.readWebPage("http://gmail.com");
<br/> System.out.println(html);
<br/> }
<br/>}
<br/>
Was it clear so far? Highlight the text in question
Or onclick="window.location.href='/BASE/jsp/chat.jsp?issueID=74&ur=f'">
Assignments: 1. Open Eclipse and navigate to the project week7.network.
2. Open the project to see the src directory.
3. Right click on the src directory – NEW – Package its.day16.http 4. Right click on this new package and create – NEW – Class - WebPageReader 5. Type the source above into the class.
6. Right mouse click on the source – Run – As Java Application
7. You will see in the Console an html source of the target page.
8. Change the target page to another web URL, starting with http://.
9. Run this application again and see the result in the Console.
We invite you to create your own questions and answers (QnA) to increase your rank and win the Top Creativity Prize!
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