Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright (C) 2010 Peter Karich <jetwick_@_pannous_._info>
 *
 * 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.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URL;

public class Main {
    /**
     * On some devices we have to hack:
     * http://developers.sun.com/mobility/reference/techart/design_guidelines/http_redirection.html
     * @return the resolved url if any. Or null if it couldn't resolve the url
     * (within the specified time) or the same url if response code is OK
     */
    public static String getResolvedUrl(String urlAsString, int timeout) {
        try {
            URL url = new URL(urlAsString);
            //using proxy may increase latency
            HttpURLConnection hConn = (HttpURLConnection) url.openConnection(Proxy.NO_PROXY);
            // force no follow

            hConn.setInstanceFollowRedirects(false);
            // the program doesn't care what the content actually is !!
            // http://java.sun.com/developer/JDCTechTips/2003/tt0422.html
            hConn.setRequestMethod("HEAD");
            // default is 0 => infinity waiting
            hConn.setConnectTimeout(timeout);
            hConn.setReadTimeout(timeout);
            hConn.connect();
            int responseCode = hConn.getResponseCode();
            hConn.getInputStream().close();
            if (responseCode == HttpURLConnection.HTTP_OK)
                return urlAsString;

            String loc = hConn.getHeaderField("Location");
            if (responseCode == HttpURLConnection.HTTP_MOVED_PERM && loc != null)
                return loc.replaceAll(" ", "+");

        } catch (Exception ex) {
        }
        return "";
    }

    public static String getInputStream(InputStream is) throws IOException {
        if (is == null)
            throw new IllegalArgumentException("stream mustn't be null!");

        BufferedReader bufReader = createBuffReader(is);
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = bufReader.readLine()) != null) {
            sb.append(line);
            sb.append('\n');
        }
        bufReader.close();
        return sb.toString();
    }

    public static BufferedReader createBuffReader(File file)
            throws FileNotFoundException, UnsupportedEncodingException {
        return new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF-8"));
    }

    public static BufferedReader createBuffReader(InputStream is)
            throws FileNotFoundException, UnsupportedEncodingException {
        return new BufferedReader(new InputStreamReader(is, "UTF-8"));
    }
}