通过Jsoup获得top100下载地址后台下载mp3
? 通过解析top100的页面获得歌曲的下载地址，后台下载歌曲。比较粗糙，有时会报
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? java.net.SocketTimeoutException: Read timed out
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? 找了很久，不知道什么原因。需要jsoup支持
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? jsoup下载地址：
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? http://jsoup.org/download
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? 代码如下：
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import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.URL;import java.net.URLConnection;import java.net.URLEncoder;import org.jsoup.Jsoup;import org.jsoup.nodes.Document;import org.jsoup.nodes.Element;import org.jsoup.select.Elements;public class GetTop100 {public static void main(String[] args) throws Exception{String keyword = "B小调雨后";boolean isDownload = true;String encodeKeyword = URLEncoder.encode(keyword, "UTF-8");String searchUrl = "http://www.top100.cn/search/?act=allsong&keyword=" + encodeKeyword;String downloadpageurl = getDownloadPageFromURL(searchUrl);if (isEmpty(downloadpageurl)) {System.out.println("没有找到" + keyword + "!");System.exit(0);} else {System.out.println("找到了" + keyword);}if (!isDownload) return;String downloadUrl = getDownloadUrl(downloadpageurl);System.out.println(downloadUrl);String filename = "C:\" + keyword + ".mp3";downLoadMp3FromUrl(downloadUrl, filename);System.out.println("完成");}static String getDownloadPageFromURL(String url) throws Exception {System.out.println(url);//String url = "http://www.top100.cn/search/?act=allsong&keyword=%E5%A4%9C%E5%A4%9C%E5%A4%9C%E5%A4%9C";Document document = Jsoup.connect(url).get();Element searchTopDiv = document.getElementsByClass("listen_search_top").get(0);Elements resultDivs = searchTopDiv.getElementsByTag("div");if (!resultDivs.isEmpty()) {String msg = resultDivs.get(0).text();if (msg.contains("没有找到")) {return null;}}if (!searchTopDiv.text().contains("含有")) {return null;}Elements no5s = document.getElementsByClass("No5");Element no5 = no5s.first();Element down = no5.getElementsByClass("down").first();String href = down.attr("href");String productid = href.substring(href.indexOf("'") + 2, href.lastIndexOf("'"));String downloadpageurl = "http://www.top100.cn/download/download.php?Productid=" + productid ;return downloadpageurl;}static String getDownloadUrl(String url) throws Exception{Document document = Jsoup.connect(url).get();Elements downloadDiv = document.getElementsByClass("Listen_downloadtopcon");Element no6 = downloadDiv.get(0).getElementsByClass("No6").get(0);Element a = no6.getElementsByTag("a").get(0);String href = a.attr("href");String downloadUrl = "http://www.top100.cn" + href;return downloadUrl;}static void downLoadMp3FromUrl(String downloadUrl, String filename) throws Exception{URL download = new URL(downloadUrl);URLConnection con = download.openConnection();InputStream is = con.getInputStream();byte[] bs = new byte[1024];int len;OutputStream os = new FileOutputStream(filename);while((len = is.read(bs)) != -1) {os.write(bs, 0, len);}os.close();is.close();}static boolean isEmpty(Object object) {if (object == null) {return true;} else if (object instanceof String) {if (object == null || object.toString().length() == 0) {return true;}}return false;}}??
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