取出的表格数据为空，请问这是什么情况...
还有string body这里怎样从页面提取的...
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class Main {
public static void main(String[] args) throws Throwable {
for (int i = 1; i <= 3; i++) {
System.out.println(getPrice(i));
}
}
static List<String> getPrice(int pageNo) throws Throwable {
Document doc = Jsoup.parse(getText(pageNo));
Elements trs = doc.select("#ctl00_cphMainFrame_Table1 tr");
List<String> result = new ArrayList<String>(trs.size());
for (int i = 1, l = trs.size(); i < l; i++) {
Element tr = trs.get(i);
result.add(tr.child(5).text());
}
return result;
}
static String getText(int pageNo) throws Throwable {
URL url = new URL("http://www.lnprice.gov.cn/wjjc/jgjc/ReportByDateOfPivot.aspx?PriceBureauMainType_Id=101&YM=201502&DP=28");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko");
conn.setDoOutput(true);
conn.connect();
String body = "ctl00%24cphMainFrame%24ScriptManager1=ctl00%24cphMainFrame%24UpdatePanel1%7Cctl00%24cphMainFrame%24aspnetpager1&ctl00%24cphMainFrame%24ddlYear=2015&ctl00%24cphMainFrame%24ddlMonth=02&ctl00%24cphMainFrame%24ddlTimePoint=28&__EVENTTARGET=ctl00%24cphMainFrame%24aspnetpager1&__LASTFOCUS=&__VIEWSTATE=%2FwEPDwULLTEwNTcyNDc4NjkPZBYCZg9kFgICAQ9kFgQCAQ8WAh4LXyFJdGVtQ291bnQCCxYWZg9kFgJmDxUCAzEwMQzlhpzlia%2Fkuqflk4FkAgEPZBYCZg8VAgMxMDcP5bel5Lia5raI6LS55ZOBZAICD2QWAmYPFQIDMTA4EuW3peS4mueUn%2BS6p%2Bi1hOaWmWQCAw9kFgJmDxUCAzEwORjln47luILlsYXmsJHmnI3liqHku7fmoLxkAgQPZBYCZg8VAgMxMTAY5Yac5p2R5bGF5rCR5pyN5Yqh5Lu35qC8ZAIFD2QWAmYPFQIDMTExDOa2ieWGnOS6p%2BWTgWQCBg9kFgJmDxUCAzEwMhwyMDEz5bm05Lul5YmN5bel5Lia5raI6LS55ZOBZAIHD2QWAmYPFQIDMTAzHzIwMTPlubTku6XliY3lt6XkuJrnlJ%2FkuqfotYTmlplkAggPZBYCZg8VAgMxMDQZMjAxM%2BW5tOS7peWJjeacjeWKoeS7t%2BagvGQCCQ9kFgJmDxUCAzEwNR8yMDEz5bm05Lul5YmN5Yac5Lia55Sf5Lqn6LWE5paZZAIKD2QWAmYPFQIDMTA2GTIwMTPlubTku6XliY3mtonlhpzkuqflk4FkAgMPZBYQAgEPDxYCHgRUZXh0BQzlhpzlia%2Fkuqflk4FkZAIDDw8WBB8BBVw8c3BhbiBzdHlsZT0ibWFyZ2luLWxlZnQ6MjBweDsiICBjbGFzcz0ibXNqZ19jaGF4dW5feHhrMV9iZzAwIiA%2B5oyJ5YiG57G75YWo55yB5p%2Bl6K%2BiPC9zcGFuPh4LTmF2aWdhdGVVcmwFM1JlcG9ydEJ5RGF0ZU9mUGl2b3QuYXNweD9QcmljZUJ1cmVhdU1haW5UeXBlX0lkPTEwMWRkAgQPDxYEHwEFQTxzcGFuIGNsYXNzPSJtc2pnX2NoYXh1bl94eGsxX2JnMTEiID7mjInllYblk4HliIbluILmn6Xor6I8L3NwYW4%2BHwIFNVJlcG9ydEdvb2RzSW5mb0J5Q2l0eS5hc3B4P1ByaWNlQnVyZWF1TWFpblR5cGVfSWQ9MTAxZGQCBQ8PFgQfAQVCPHNwYW4gY2xhc3M9Im1zamdfY2hheHVuX3h4azFfYmcxMSIgPuaMieaXtumXtOWIhuW4guafpeivoiA8L3NwYW4%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%2FO1WQW50DLN7G3eiSyS6q2rewQ&__EVENTVALIDATION=%2FwEWJAKb97l9ArjilMkFApDM2c4FApDMreUCApDMsZgLApDMhT8CkMzp0wgCkMz99gECkMzBrQ4CkMzVwAYCkMz5KQKQzM3MCAL79f%2FVDwL79cOIBAL79devDQL79bvCBQL79Y%2F5AgL79ZOcCwLWm967DgLG9LjWAgLG9LzWAgLG9IDWAgLG9ITWAgLG9IjWAgLG9IzWAgLG9JDWAgLG9NTVAgLG9NjVAgLZ9LTWAgLZ9LjWAgLZ9LzWAgLSx8%2BzDgLMx%2B%2BzDgLMx%2BOzDgLPx4%2BwDgLy%2BZrvCEFw0vATX2wSsTwyj9sMOqdXBRc0&__ASYNCPOST=true&__EVENTARGUMENT=" + pageNo;
conn.getOutputStream().write(body.getBytes());
byte[] buff = new byte[4096];
int count;
ByteArrayOutputStream out = new ByteArrayOutputStream(4096);
InputStream in = conn.getInputStream();
while((count = in.read(buff)) != -1) {
out.write(buff, 0, count);
}
conn.disconnect();
return out.toString("UTF-8");
}
}
------解决思路----------------------
String body = "ctl00%24cphMainFrame%24ScriptManager1=ctl00%24cphMainFrame%24UpdatePanel1%7Cctl00%24cphMainFrame%24aspnetpager1&__EVENTTARGET=ctl00%24cphMainFrame%24aspnetpager1&__EVENTARGUMENT=" + pageNo+"&__LASTFOCUS=&__VIEWSTATE=%2FwEPDwULLTEwNTcyNDc4NjkPZBYCZg9kFgICAQ9kFgQCAQ8WAh4LXyFJdGVtQ291bnQCCxYWZg9kFgJmDxUCAzEwMQzlhpzlia%2Fkuqflk4FkAgEPZBYCZg8VAgMxMDcP5bel5Lia5raI6LS55ZOBZAICD2QWAmYPFQIDMTA4EuW3peS4mueUn%2BS6p%2Bi1hOaWmWQCAw9kFgJmDxUCAzEwORjln47luILlsYXmsJHmnI3liqHku7fmoLxkAgQPZBYCZg8VAgMxMTAY5Yac5p2R5bGF5rCR5pyN5Yqh5Lu35qC8ZAIFD2QWAmYPFQIDMTExDOa2ieWGnOS6p%2BWTgWQCBg9kFgJmDxUCAzEwMhwyMDEz5bm05Lul5YmN5bel5Lia5raI6LS55ZOBZAIHD2QWAmYPFQIDMTAzHzIwMTPlubTku6XliY3lt6XkuJrnlJ%2FkuqfotYTmlplkAggPZBYCZg8VAgMxMDQZMjAxM%2BW5tOS7peWJjeacjeWKoeS7t%2BagvGQCCQ9kFgJmDxUCAzEwNR8yMDEz5bm05Lul5YmN5Yac5Lia55Sf5Lqn6LWE5paZZAIKD2QWAmYPFQIDMTA2GTIwMTPlubTku6XliY3mtonlhpzkuqflk4FkAgMPZBYQAgEPDxYCHgRUZXh0BQzlhpzlia%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%2BmAieaLqQIwNQIxNQIyNRUEATACMjgCMjkCMzAUKwMEZ2dnZ2RkAg8PFgIeB1Zpc2libGVnFgJmD2QWAmYPZBYCAgMPZBYCZg9kFgICAw8WAh8GZxYCZg9kFgJmD2QWAgIBDw8WBB4IUGFnZVNpemUCFB4LUmVjb3JkY291bnQCL2RkZPAk2ix3m2IEls%2BNVH%2BJJXsdGxQz&__EVENTVALIDATION=%2FwEWJALD3sbkAgK44pTJBQKQzNnOBQKQzK3lAgKQzLGYCwKQzIU%2FApDM6dMIApDM%2FfYBApDMwa0OApDM1cAGApDM%2BSkCkMzNzAgC%2B%2FX%2F1Q8C%2B%2FXDiAQC%2B%2FXXrw0C%2B%2FW7wgUC%2B%2FWP%2BQIC%2B%2FWTnAsC1pveuw4CxvS41gICxvS81gICxvSA1gICxvSE1gICxvSI1gICxvSM1gICxvSQ1gICxvTU1QICxvTY1QIC2fS01gIC2fS41gIC2fS81gIC0sfPsw4CzMfvsw4CzMfjsw4Cz8ePsA4C8vma7wh1iQfu3d9DTRXaCtL0s43%2FAw7VFQ%3D%3D&ctl00%24cphMainFrame%24ddlYear=2015&ctl00%24cphMainFrame%24ddlMonth=02&ctl00%24cphMainFrame%24ddlTimePoint=28&__ASYNCPOST=true&";