java - 如何用Jsoup填写表格？

我正在尝试导航到加利福尼亚网站http://kepler.sos.ca.gov/的描述页面。但无法走。

然后，我有一个html表单，正在该表单上提交请求，
我无法在此处添加表单，但它对带有所需参数的http://kepler.sos.ca.gov/来说是一个简单的POST请求

我可以从我来自这里的上一页获得__EVENTTARGET和__EVENTARGUMENT。

我究竟做错了什么？

代码:

String url = "kepler.sos.ca.gov/";
Connection.Response resp = Jsoup.connect(url)
                                .timeout(30000)
                                .method(Connection.Method.GET)
                                .execute();
Document responseDocument = resp.parse();
Map<String, String> loginCookies = resp.cookies();
   eventValidation=responseDocument.select("input[name=__EVENTVALIDATION]").first();
viewState = responseDocument.select("input[name=__VIEWSTATE]").first();

最佳答案

您想使用 FormElement 。这是Jsoup的有用功能。它能够找到在表单内声明的字段并将其发布给您。在发布表单之前，您可以使用Jsoup API设置字段的值。

样本代码

// * Connect to website
String url = "http://kepler.sos.ca.gov/";
Connection.Response resp = Jsoup.connect(url) //
                                .timeout(30000) //
                                .method(Connection.Method.GET) //
                                .execute();

// * Find the form
Document responseDocument = resp.parse();
Element potentialForm = responseDocument.select("form#aspnetForm").first();
checkElement("form element", potentialForm);
FormElement form = (FormElement) potentialForm;

// * Fill in the form and submit it
// ** Search Type
Element radioButtonListSearchType = form.select("[name$=RadioButtonList_SearchType]").first();
checkElement("search type radio button list", radioButtonListSearchType);
radioButtonListSearchType.attr("checked", "checked");

// ** Name search
Element textBoxNameSearch = form.select("[name$=TextBox_NameSearch]").first();
checkElement("name search text box", textBoxNameSearch);
textBoxNameSearch.val("cali");

// ** Submit the form
Document searchResults = form.submit().cookies(resp.cookies()).post();

// * Extract results (entity numbers in this sample code)
for (Element entityNumber : searchResults.select("table[id$=SearchResults_Corp] > tbody > tr > td:first-of-type:not(td[colspan=5])")) {
    System.out.println(entityNumber.text());
}

public static void checkElement(String name, Element elem) {
    if (elem == null) {
        throw new RuntimeException("Unable to find " + name);
    }
}

输出(截至撰写本文时)

也可以看看:

在此示例中，我们将使用GitHub类登录FormElement网站。

// # Constants used in this example
final String USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36";
final String LOGIN_FORM_URL = "https://github.com/login";
final String USERNAME = "yourUsername";
final String PASSWORD = "yourPassword";

// # Go to login page
Connection.Response loginFormResponse = Jsoup.connect(LOGIN_FORM_URL)
                                             .method(Connection.Method.GET)
                                             .userAgent(USER_AGENT)
                                             .execute();

// # Fill the login form
// ## Find the form first...
FormElement loginForm = (FormElement)loginFormResponse.parse()
                                         .select("div#login > form").first();
checkElement("Login Form", loginForm);

// ## ... then "type" the username ...
Element loginField = loginForm.select("#login_field").first();
checkElement("Login Field", loginField);
loginField.val(USERNAME);

// ## ... and "type" the password
Element passwordField = loginForm.select("#password").first();
checkElement("Password Field", passwordField);
passwordField.val(PASSWORD);


// # Now send the form for login
Connection.Response loginActionResponse = loginForm.submit()
         .cookies(loginFormResponse.cookies())
         .userAgent(USER_AGENT)
         .execute();

System.out.println(loginActionResponse.parse().html());

public static void checkElement(String name, Element elem) {
    if (elem == null) {
        throw new RuntimeException("Unable to find " + name);
    }
}

所有表单数据都由FormElement类为我们处理(甚至包括表单方法检测)。调用Connection方法时，将生成一个现成的FormElement#submit。我们要做的就是用附加头(Cookie，用户代理等)完成此连接并执行它。

formElement

java - 如何用Jsoup填写表格？