Java example which downloads the content of a specified HTTPS URL. Includes instructions for building with j2objc.

HttpsExample.java

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;

/**
 * Simple command-line example demonstrating how to download content from an
 * HTTP or HTTPS URL.
 *
 * To build with j2objc (https://j2objc.org) on a Mac, run:
 *
 *   $ export PATH=$PATH:$(J2OBJC_DISTRIBUTION_DIRECTORY)
 *   $ j2objc HttpsExample.java
 *   $ j2objcc HttpsExample.m
 *   $ ./a.out HttpsExample https://j2objc.org/ # use any valid URL.
 */
public class HttpsExample {

  public static void main(String[] args) throws Exception {
    if (args.length != 1) {
      System.err.println("usage: java HttpsExample <https://your.url.here>");
      System.exit(1);
    }
    URL httpsUrl = new URL(args[0]);
    HttpsURLConnection conn = (HttpsURLConnection)httpsUrl.openConnection();
    try (
        InputStream is = conn.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
    ) {
      String inputLine;
      while ((inputLine = br.readLine()) != null) {
        System.out.println(inputLine);
      }
    }
  }
}