Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern HTML_TITLE_PATTERN = Pattern.compile("\\<title>(.*)\\</title>",
            Pattern.CASE_INSENSITIVE | Pattern.DOTALL);

    /**
     * @param http
     * @return extracted title of page from html.
     * @throws IOException
     */
    public static String getPageTitle(String linkUrl) throws IOException {
        URL url = new URL(linkUrl);
        URLConnection conn = null;
        try {

            conn = url.openConnection();

            String type = conn.getContentType();
            if (type != null && !type.toLowerCase().contains("text/html"))
                return null; // if not html, we can't get title. Return from here.
            else {
                // read response stream
                BufferedReader bufReader = new BufferedReader(
                        new InputStreamReader(conn.getInputStream(), Charset.defaultCharset()));
                int n = 0;
                int readCount = 0;
                char[] buf = new char[1024];
                StringBuilder content = new StringBuilder();

                // read till end of file or 8 times the buffer (no need to read
                // all data, assuming we get content in first 8 reads)
                while (readCount < 8 && (n = bufReader.read(buf, 0, buf.length)) != -1) {
                    content.append(buf, 0, n);
                    readCount++;
                }
                bufReader.close();

                // extract the title
                Matcher matcher = HTML_TITLE_PATTERN.matcher(content);
                if (matcher.find()) {

                    // replace whitespaces and HTML brackets

                    return matcher.group(1).replaceAll("[\\s\\<>]+", " ").trim();
                } else
                    return null;
            }
        } finally {
            //any cleanup?
        }
    }
}