(Java) Fetch Web Pages from Local Cache

Demonstrates how to keep a local cache to avoid re-fetching web pages.

Note: This example requires Chilkat v9.5.0.91 or later.

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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[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // Define a cache directory and set the number of levels based on the anticipated size of the cache.
    http.AddCacheRoot("c:/AAWorkarea/httpCache/");

    // up to 256 sub-directories under the cache root will be created as needed to hold cached GET's.
    http.put_NumCacheLevels(1);

    // Tell the http object to fetch from the cache if possible.
    http.put_FetchFromCache(true);

    // Also tell the http object to update the cache with newly fetched pages.
    http.put_UpdateCache(true);

    // This HTTP GET should result in a cache file getting created.
    String html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // The 1st GET was not from cache:
    System.out.println("Fetched from cache: " + http.get_LastFromCache());

    // Fetching again will cause the page to be delivered from our local cache.
    html = http.quickGetStr("https://www.google.com/");
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // The 2nd GET is from cache:
    System.out.println("Fetched from cache: " + http.get_LastFromCache());
  }
}