Here you can find the source of getInputStream(URLConnection c)
public static InputStream getInputStream(URLConnection c) throws IOException
//package com.java2s; /**/*from w w w . ja v a 2 s .c o m*/ * Copyright (C) 2017 Lucifer Wong * * 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.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.net.URLConnection; import java.util.zip.GZIPInputStream; import java.util.zip.Inflater; import java.util.zip.InflaterInputStream; public class Main { private static final int TRANSFER_BUFFER = 32768; public static InputStream getInputStream(URLConnection c) throws IOException { InputStream is = c.getInputStream(); String enc = c.getContentEncoding(); if ("gzip".equalsIgnoreCase(enc) || "x-gzip".equalsIgnoreCase(enc)) { is = new GZIPInputStream(is, TRANSFER_BUFFER); } else if ("deflate".equalsIgnoreCase(enc)) { is = new InflaterInputStream(is, new Inflater(), TRANSFER_BUFFER); } return new BufferedInputStream(is); } }