<div style="background-color: #cccccc; margin: 5px auto; width: 215px; height: 215px">
<a href="http://XXX/t?id=XXX" target="_blank" title="XXX"><img src="http://XXX/aaa.jpg" style="width: 213px; height: 213px" /> </a></div>
<div style="line-height: 14px; background-color: #fff; margin: 5px auto; width: 215px; height: 14px">
String html = ...;
Document doc = Jsoup.parseBodyFragment(html);
Element a = doc.select("a").first();
a.attr("href", "http://www.baidu.com");
String result = doc.outerHtml();
<html>
<head></head>
<body>
<div style="background-color: #cccccc; margin: 5px auto; width: 215px; height: 215px">
<a href="http://www.baidu.com" target="_blank" title="XXX"> <img src="http://XXX/aaa.jpg" style="width: 213px; height: 213px" /> </a>
</div>
<div style="line-height: 14px; background-color: #fff; margin: 5px auto; width: 215px; height: 14px"></div>
</body>
</html>
String source = "<div style=\"background-color: #cccccc; margin: 5px auto; width: 215px; height: 215px\"><a href=\"http://XXX/t?id=XXX\" target=\"_blank\" title=\"XXX\"><img src=\"http://XXX/aaa.jpg\" style=\"width: 213px; height: 213px\" /> </a></div><div style=\"line-height: 14px; background-color: #fff; margin: 5px auto; width: 215px; height: 14px\">";
String reg = "<a[^<>]*?\\shref=['\"]?(.*?)['\"].*?>";
Matcher m = Pattern.compile(reg).matcher(source);
while (m.find()) {
String value = m.group(1);
System.out.println(value);
System.out.println(source.replace(value, "www.xxoo.com"));
}
