Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicPythonRubySQL ServerSwiftTclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcel

Java Examples

Async
Certificates
ECC
Email Object
Encryption
FTP
HTML-to-XML/Text
Gzip
HTTP
IMAP
JSON
Jwt
MHT / HTML Email
PEM
PFX/P12
Java KeyStore (JKS)
OAuth2
POP3
RSA Encryption
MIME
REST
SCP
SMTP
Socket/SSL/TLS
SSH Key
SSH
SSH Tunnel
SFTP
Stream
Tar Archive
XML
XMP
Zip

More Examples...
OpenSSL
Google APIs
Google Cloud Storage
Azure Cloud Storage
Amazon S3 (new)
Google Drive
Dropbox
Firebase
ASN.1
PRNG
Amazon S3
Bounced Email
CSV
Diffie-Hellman
DKIM / DomainKey
DSA
NTLM
QuickBooks
Spider
Digital Signatures

 

 

 

 

 

 

 

(Java) A Simple Web Crawler

This demonstrates a very simple web crawler using the Chilkat Spider component.

Chilkat Java Downloads

Java Libs for Windows, Linux, MAC OS X, Solaris,
FreeBSD, ARM Embedded Linux, and PowerLinux

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkSpider spider = new CkSpider();

    CkStringArray seenDomains = new CkStringArray();
    CkStringArray seedUrls = new CkStringArray();

    seenDomains.put_Unique(true);
    seedUrls.put_Unique(true);

    //  You will need to change the start URL to something else...
    seedUrls.Append("http://something.whateverYouWant.com/");

    //  Set outbound URL exclude patterns
    //  URLs matching any of these patterns will not be added to the
    //  collection of outbound links.
    spider.AddAvoidOutboundLinkPattern("*?id=*");
    spider.AddAvoidOutboundLinkPattern("*.mypages.*");
    spider.AddAvoidOutboundLinkPattern("*.personal.*");
    spider.AddAvoidOutboundLinkPattern("*.comcast.*");
    spider.AddAvoidOutboundLinkPattern("*.aol.*");
    spider.AddAvoidOutboundLinkPattern("*~*");

    //  Use a cache so we don't have to re-fetch URLs previously fetched.
    spider.put_CacheDir("c:/spiderCache/");
    spider.put_FetchFromCache(true);
    spider.put_UpdateCache(true);

    while (seedUrls.get_Count() > 0) {

        String url = seedUrls.pop();
        spider.Initialize(url);

        //  Spider 5 URLs of this domain.
        //  but first, save the base domain in seenDomains
        String domain = spider.getUrlDomain(url);
        seenDomains.Append(spider.getBaseDomain(domain));

        int i;
        boolean success;
        for (i = 0; i <= 4; i++) {
            success = spider.CrawlNext();
            if (success == true) {

                //  Display the URL we just crawled.
                System.out.println(spider.lastUrl());

                //  If the last URL was retrieved from cache,
                //  we won't wait.  Otherwise we'll wait 1 second
                //  before fetching the next URL.
                if (spider.get_LastFromCache() != true) {
                    spider.SleepMs(1000);
                }

            }
            else {
                //  cause the loop to exit..
                i = 999;
            }

        }

        //  Add the outbound links to seedUrls, except
        //  for the domains we've already seen.
        for (i = 0; i <= spider.get_NumOutboundLinks() - 1; i++) {

            url = spider.getOutboundLink(i);
            String domain = spider.getUrlDomain(url);
            String baseDomain = spider.getBaseDomain(domain);
            if (seenDomains.Contains(baseDomain) == false) {
                //  Don't let our list of seedUrls grow too large.
                if (seedUrls.get_Count() < 1000) {
                    seedUrls.Append(url);
                }

            }

        }

    }


  }
}

 

© 2000-2016 Chilkat Software, Inc. All Rights Reserved.