Java Basics 1.18

ApacheFileUtils Library

• http://commons.apache.org/proper/commons-io/
  • http://apache.mirrors.lucidnetworks.net/commons/
  • http://apache.mirrors.lucidnetworks.net/commons/io/binaries/commons-io-2.6-bin.tar.gz
• http://commons.apache.org/proper/commons-io/javadocs/api-release/index.html
• Most developers put jars in the project’s \lib folder
• Add to Build path: Access Denied
  • Clear Hidden Attribute
  • Set Everyone for ‘Full Control’

Code:

package com.lynda.files;

 

import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

 

public class ReadNetworkFile {

 

    public static void main(String[] args) {

      

      try {

            URL url = new URL("http://services.explorecalifornia.org/rss/tours.php");

            InputStream stream = url.openStream();

            BufferedInputStream buf = new BufferedInputStream(stream);

            

            StringBuilder sb = new StringBuilder();

            

            while (true) {

                 //buff.read will return number of character read

                 //will send -1 if end of file/stream

                 int data = buf.read();

                 

                 if (data == -1) {

                      break;

                 }

                 else {

                      //convert data to char

                      sb.append((char)data); //Type Casting

                 }

            }

            System.out.println(sb);

      } catch (MalformedURLException e) {

            e.printStackTrace();

      } catch (IOException e) {

            e.printStackTrace();

      }    

    }

}

 

 

ParseXML

• get jdom or use java base classes:

Code:

package com.lynda.files;

 

import java.io.IOException;

 

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

 

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

 

public class ReadXML {

 

    public static void main(String[] args) {

 

      try {

            DocumentBuilderFactory factory =

                      DocumentBuilderFactory.newInstance();

           DocumentBuilder builder = factory.newDocumentBuilder();

            Document doc = builder.parse("http://services.explorecalifornia.org/rss/tours.php");

            

            NodeList list = doc.getElementsByTagName("title");

            System.out.println("There are " + list.getLength() + " items");

            

            for (int i = 0; i < list.getLength(); i++) {

                 Element item = (Element)list.item(i);

                 System.out.println(item.getFirstChild().getNodeValue());

            }

            

      } catch (ParserConfigurationException e) {

            e.printStackTrace();

      } catch (SAXException e) {

            e.printStackTrace();

      } catch (IOException e) {

            e.printStackTrace();

      }

    }

}