Java HTTP Read getInputStream(HttpURLConnection conn)

Description

get Input Stream

License

Open Source License

Declaration

public static InputStream getInputStream(HttpURLConnection conn) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2005-2011 eBay Inc./*from  w w  w. ja  va 2 s.  c om*/
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;

public class Main {
    public static InputStream getInputStream(HttpURLConnection conn) {
        return getInputStream(conn, false); //only get valid inputStream
    }

    public static InputStream getInputStream(HttpURLConnection conn, boolean includeError) {
        InputStream stream = null;
        try {
            int code = HttpURLConnection.HTTP_OK;
            try {
                code = conn.getResponseCode();
            }
            //catch (java.io.FileNotFoundException exp) {
            catch (java.io.IOException exp) {
                //this exception is due to JDK 1.3.1 bug when 401 returns
                int index = 0;
                String errMessage = null;
                while ((errMessage = conn.getHeaderField(index)) != null) {
                    if (errMessage.indexOf(" 401 ") != -1) {
                        code = HttpURLConnection.HTTP_UNAUTHORIZED;
                        break;
                    }
                    index++;
                }
            }

            if (code == HttpURLConnection.HTTP_UNAUTHORIZED) {
                //create a stream for sending the default login page
                stream = new ByteArrayInputStream(getLoginForm(conn.getURL().toString()).getBytes());
            } else {
                stream = conn.getInputStream();
                if (stream == null && includeError)
                    stream = conn.getErrorStream();
            }
        } catch (IOException e) {
        }
        return stream;
    }

    static String getLoginForm(String urlStr) {
        //create default login page for HttpRequest login 
        String loginForm = "<H>Logon to : " + getURLHost(urlStr) + "</H>"
                + "<FORM name=login method=AUTHORIZATION action=" + urlStr + ">" + "<TABLE><TR>"
                + "<TD>User Name : </TD>" + "<TD><INPUT size=10 name=username></TD>" + "</TR><TR>"
                + "<TD>Password : </TD>" + "<TD><INPUT type=password size=10 name=password></TD>" + "</TR></TABLE>"
                + "<INPUT type=submit value=Submit>" + "</FORM>";

        return loginForm;

    }

    /**
     * Returns the URL host
     */
    static public String getURLHost(String url_str) {
        if (url_str == null)
            return null;

        String s = url_str;
        int i = s.indexOf("://");
        if (i > -1) {
            s = s.substring(i + 3);
        }
        i = s.indexOf('/');
        if (i > -1) {
            s = s.substring(0, i);
        }
        return s;
    }
}

Related

1. getContentTypeSpecified(URLConnection connection)
2. getContentWithPost(String urls, Map pv)
3. getData(String urlString)
4. getHtmlByteArray(final String url)
5. getHtmlContent(String url)
6. getInputStream(HttpURLConnection connection)
7. getInputStream(String myUrl)
8. getInputStream(String url)
9. getInputStreamFromURL(String urlname)