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POJava store crawleds page to mysql in a unified encoding
 

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    <p>I am crawling webpages to MySQL database using Java.</p> <p>These webpages are in various encoding(e.g. GBK, UTF8 ...) and may contain none ASCII characters, however, I managed to detect each page's encoding and get the readable string(readable string means it displays the same in <code>Eclipse console</code> as in <code>Web Browser</code>). </p> <p>I get webpage encoding, defaults to <code>UTF-8</code> if not found, from <code>&lt;meta&gt;</code> tag. See the following snippet:</p> <pre><code>InputStream is = hconn.getInputStream(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); int b = -1; while (-1 != (b = is.read())) { baos.write((byte) b); } String charset = "UTF-8"; Document doc = Jsoup.parse(baos.toString()); Elements metas = doc.select("meta[http-equiv=Content-Type]"); Pattern p = Pattern.compile("charset=([0-9a-zA-Z_\\-]+)"); Matcher m; for (Element meta : metas) { m = p.matcher(meta.toString()); if (m.find()) charset = m.group(1); } String str = new String(baos.toByteArray(), charset); </code></pre> <p>Then, I store it to MySQL. The MySQL connection url is <code>jdbc:mysql://localhost:3306/db?characterEncoding=gbk</code>, and the column to store text to is of <code>GBK</code> encoding. </p> <p>Things happened that strings well displayed in <code>Eclipse console</code> turned out to be none recognizable sequence in MySQL and sometimes may raise SQLException. Observationally, none <code>GBK</code> strings will go wrong.</p> <p>I think converting <code>Non-GBK</code> strings to <code>GBK</code> will work, but how to? And are there any work around approaches? My final goal is construct an inverted index.</p> <p>Answers to encoding converting is preferred.</p> <p>Any help will be grateful. Thanks in advance.</p> <p><hr> <strong>Add:</strong></p> <p>Create table SQL:</p> <pre><code>CREATE TABLE `indexer`.`pages` ( `content` TEXT CHARACTER SET gbk COLLATE gbk_chinese_ci, `url` VARCHAR(512) NOT NULL, `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`) ) ENGINE = InnoDB; </code></pre> <p>Error Message:</p> <p><code>You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'é”??μ￠Wé”??μ?é”??μ—é”??–¤??·DPIyé”????é”??–¤??·é”????0")Sé”????&lt;é”????cé”??–¤??' at line 1</code></p>
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