抓取時無法通過 jsoup 導航 aspx 頁面

Question

我正在 jsoup 中抓取 url( http://nvsos.gov/sosentitysearch/CorpSearch.aspx )，但是我能夠抓取第一頁但無法導航到第二頁。

這是代碼片段

try
{
    string url = "http://nvsos.gov/sosentitysearch/CorpSearch.aspx";
    Connection.Response response = Jsoup.connect(url).method(Connection.Method.GET).execute();
    Document responseDocument = response.parse();

    Element eventValidation = responseDocument.select("input[name=__EVENTVALIDATION]").first();
    Element viewState = responseDocument.select("input[name=__VIEWSTATE]").first();

    //javascript:__doPostBack('ctl00$MainContent$objSearchGrid$dgCorpSearchResults$ctl54$ctl01','')
    response = Jsoup.connect(url)
    .data("__VIEWSTATE", viewState.attr("value"))
    .data("__EVENTVALIDATION", eventValidation.attr("value"))
    .data("ctl00$MainContent$txtSearchBox", "apple")  // <- search 
    .data("ctl00$MainContent$btnCorpSearch", "Search")
    .data("ctl00$MainContent$ddlCorpSortColumns", "m")
    .data("ctl00$MainContent$ddlCorpNumSortColumns", "m")
    .data("ctl00$MainContent$ddlOfficerSortColumns", "m")
    .data("ctl00$MainContent$ddlRASortColumns", "m")
    .data("ctl00$MainContent$ddlABNSortColumns", "m")
    .data("ctl00$MainContent$ddlABNSortColumns", "m")
    .data("ctl00$MainContent$rdlSortOrder", "d")
    .data("ctl00$MainContent$objSearchGrid$dgCorpSearchResults$ctl54$ctl01", "")
    .method(Connection.Method.POST)
    .followRedirects(true)
    .execute();

    Document document = response.parse(); //search results
    System.out.println(document);

}
catch (IOException e)
{
    e.printStackTrace();
}

這里.data("ctl00$MainContent$objSearchGrid$dgCorpSearchResults$ctl54$ctl01", "")是導航到第二頁，但它總是返回第一頁。

Answer 1

您可能缺少一些 cookie。 試試下面的代碼：

response = Jsoup.connect(url)
.cookies(response.cookies()) // Add cookies received when fetching the first page
.data("__VIEWSTATE", viewState.attr("value"))
.data("__EVENTVALIDATION", eventValidation.attr("value"))
.data("ctl00$MainContent$txtSearchBox", "apple")  // <- search 
.data("ctl00$MainContent$btnCorpSearch", "Search")
.data("ctl00$MainContent$ddlCorpSortColumns", "m")
.data("ctl00$MainContent$ddlCorpNumSortColumns", "m")
.data("ctl00$MainContent$ddlOfficerSortColumns", "m")
.data("ctl00$MainContent$ddlRASortColumns", "m")
.data("ctl00$MainContent$ddlABNSortColumns", "m")
.data("ctl00$MainContent$ddlABNSortColumns", "m")
.data("ctl00$MainContent$rdlSortOrder", "d")
.data("ctl00$MainContent$objSearchGrid$dgCorpSearchResults$ctl54$ctl01", "")
.method(Connection.Method.POST)
.followRedirects(true)
.execute();