OkHttpGzipCachingExample.java

import com.squareup.okhttp.HttpResponseCache;
import com.squareup.okhttp.OkHttpClient;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.UUID;

public class OkHttpGzipCachingExample {
  public static void main(String[] args) throws IOException {
    String tmp = System.getProperty("java.io.tmpdir");
    File cacheDir = new File(tmp, "HttpCache-" + UUID.randomUUID());
    HttpResponseCache cache = new HttpResponseCache(cacheDir, Integer.MAX_VALUE);

    OkHttpClient client = new OkHttpClient()
        .setResponseCache(cache);

    URL url = new URL("https://api.github.com/repos/square/okhttp/contributors");

    HttpURLConnection connection1 = client.open(url);
    System.out.println(readAscii(connection1));
    System.out.println("     request count = " + cache.getRequestCount());
    System.out.println("     network count = " + cache.getNetworkCount());
    System.out.println("         hit count = " + cache.getHitCount());
    System.out.println("input stream class = " + connection1.getInputStream().getClass());

    HttpURLConnection connection2 = client.open(url);
    System.out.println(readAscii(connection2));
    System.out.println("     request count = " + cache.getRequestCount());
    System.out.println("     network count = " + cache.getNetworkCount());
    System.out.println("         hit count = " + cache.getHitCount());
    System.out.println("input stream class = " + connection2.getInputStream().getClass());
  }

  private static String readAscii(URLConnection connection, int count) throws IOException {
    HttpURLConnection httpConnection = (HttpURLConnection) connection;
    InputStream in = httpConnection.getResponseCode() < HttpURLConnection.HTTP_BAD_REQUEST
        ? connection.getInputStream() : httpConnection.getErrorStream();
    StringBuilder result = new StringBuilder();
    for (int i = 0; i < count; i++) {
      int value = in.read();
      if (value == -1) {
        in.close();
        break;
      }
      result.append((char) value);
    }
    return result.toString();
  }

  private static String readAscii(URLConnection connection) throws IOException {
    return readAscii(connection, Integer.MAX_VALUE);
  }
}