Java HTTP Get doGET(HttpURLConnection conn)

Description

do GET

License

Apache License

Declaration

public static String doGET(HttpURLConnection conn) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w w w.j  a va2  s .c  om*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {
    public static String doGET(URL url) throws IOException {
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        try {
            String reply = doGET(conn);
            if (conn.getResponseCode() != 200) {
                throw new IOException(reply);
            }
            return reply;
        } finally {
            conn.disconnect();
        }
    }

    public static String doGET(HttpURLConnection conn) throws IOException {
        conn.setRequestMethod("GET");
        return call(conn, null);
    }

    public static String call(HttpURLConnection conn, InputStream input) throws IOException {
        conn.setConnectTimeout(30 * 1000);
        conn.setReadTimeout(30 * 1000);
        conn.setUseCaches(false);

        if (input != null) {
            conn.setDoOutput(true);

            OutputStream out = conn.getOutputStream();

            byte[] data = new byte[1024];
            int read = 0;
            while ((read = input.read(data, 0, data.length)) != -1) {
                out.write(data, 0, read);
            }

            input.close();

            out.flush();
            out.close();
        } else {
            conn.connect();
        }

        InputStream is = null;

        try {
            is = conn.getInputStream();
        } catch (IOException e) {
            is = conn.getErrorStream();
        }

        StringBuilder buf = new StringBuilder();
        BufferedReader in = new BufferedReader(new InputStreamReader(is));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
            System.out.println(inputLine);
            buf.append(inputLine);
        }
        in.close();

        return buf.toString();
    }
}

Related

1. doGet(String theURL, Map nameValuePairs)
2. doGet(String url)
3. doGet(String url, HashMap params)
4. doGet(String urlStr)