如何用Jsoup填写表格？

Question

我正试图导航到加州网站http://kepler.sos.ca.gov/的描述页面.但无法前往.

然后,我有一个html表单,我提交请求,我无法在这里添加表单,但它简单的POST请求http://kepler.sos.ca.gov/与所需的参数

我能得到__EVENTTARGET并且__EVENTARGUMENT从我来到这里之前的页面.

我究竟做错了什么？

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();

Answer 1

你想用FormElement.这是Jsoup的一个有用功能.它能够找到在表单中声明的​​字段并为您发布它们.在发布表单之前,您可以使用Jsoup API设置字段的值.

诺塔:

在下面的示例代码中,您将始终看到对Element#select方法的调用,然后调用Elements#first方法.

例如 : responseDocument.select("form#aspnetForm").first()

Jsoup 1.11.1引入了一种更有效的替代方案:Element #selectFirst.您可以将其用作原始替代品的直接替代品.

例如:
responseDocument.select("form#aspnetForm").first()
可以替换为
responseDocument.selectFirst("form#aspnetForm")

示例代码

// * 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(撰写本文时)

C3036475
C3027305
C3236514
C3027304
C3034012
C3035110
C3028330
C3035378
C3124793
C3734637

也可以看看:

在此示例中,我们将使用FormElement类登录GitHub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(甚至表单方法检测).在调用FormElement#submit方法时构建现成的Connection.我们所要做的就是用附加标题(cookie,用户代理等)完成这个连接并执行它.