Question

我正在尝试从Java（通过HTTP）向某个网站提交表单，但在阅读响应时，我看不到我的预期。我到底做了什么：首先，我在浏览器中打开网站，手工填写表格并提交。在Chrome中，我可以看到通过网络传输的数据，即：

Request URL:http://wizzair.com/en-GB/Select
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:1061
Content-Type:application/x-www-form-urlencoded
Cookie:WRUID=0; ASP.NET_SessionId=3e3ahach1d34oyhtoqfshxhe; Culture=en-GB; __utma=17431487.361991764.1292186668.1354138010.1354651562.81; __utmb=17431487.9.9.1354652614319; __utmc=17431487; __utmz=17431487.1319145359.34.18.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=wizz
Host:wizzair.com
Origin:http://wizzair.com
Referer:http://wizzair.com/en-GB/Select
User-Agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.91 Safari/537.11
Form Dataview URL encoded
__EVENTTARGET:HeaderControlGroupRibbonSelectView_AvailabilitySearchInputRibbonSelectView_ButtonSubmit
__VIEWSTATE:/wEPDwUBMGRkNSMYF94e4mXCiiJGEJbRixyidoa2QXSambTT2mm6cLs=
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$OriginStation:EIN
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$DestinationStation:OTP
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$DepartureDate:02/02/2013
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$ReturnDate:05/02/2013
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountADT:1
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountCHD:0
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountINFANT:0
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$BaggageCount:0
HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$ButtonSubmit:Search

所以我尝试从Java程序模拟相同的请求，即：

        public void doSubmit(String url, Map<String, String> data) throws Exception {
    URL siteUrl = new URL(url);
    HttpURLConnection conn = (HttpURLConnection) siteUrl.openConnection();
    conn.setRequestMethod("POST");
    conn.setDoOutput(true);
    conn.setDoInput(true);

    conn.setRequestProperty("Cookie", "WRUID=0; ASP.NET_SessionId=3e3ahach1d34oyhtoqfshxhe; Culture=en-GB; __utma=17431487.361991764.1292186668.1354138010.1354651562.81; __utmb=17431487.9.9.1354652614319; __utmc=17431487; __utmz=17431487.1319145359.34.18.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=wizz");

    DataOutputStream out = new DataOutputStream(conn.getOutputStream());

    Set keys = data.keySet();
    Iterator keyIter = keys.iterator();
    String content = "";
    for(int i=0; keyIter.hasNext(); i++) {
        Object key = keyIter.next();
        if(i!=0) {
            content += "&";
        }
        content += key + "=" + URLEncoder.encode(data.get(key), "UTF-8");
    }
    System.out.println(content);
    out.writeBytes(content);
    out.flush();
    out.close();
    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String line = "";
    while((line=in.readLine())!=null) {
        System.out.println(line);
    }
    in.close();
}

....我用以下参数调用，如上面的HTTP表单数据所示：

    String url = "http://wizzair.com/en-GB/Select";
    Map<String, String> data = new TreeMap<String, String>();
    data.put("__EVENTTARGET", "HeaderControlGroupRibbonSelectView_AvailabilitySearchInputRibbonSelectView_ButtonSubmit");
    data.put("__VIEWSTATE", "/wEPDwUBMGRkNSMYF94e4mXCiiJGEJbRixyidoa2QXSambTT2mm6cLs=\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$OriginStation:EIN\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$DestinationStation:OTP\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$DepartureDate:02/02/2013\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$ReturnDate:05/02/2013\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountADT:1\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountCHD:0\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$PaxCountINFANT:0\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$BaggageCount:0\n"+
            "HeaderControlGroupRibbonSelectView$AvailabilitySearchInputRibbonSelectView$ButtonSubmit:Search"

但是，我得到的回复只是来自该网站的通用网页，而不是我预期的答案。我做错了什么？

非常感谢，问候，索林

Answer 1

我认为填充帖子数据的方式不正确。你应该有十个左右的键/值对，而不仅仅是两个。您在Chrome中看到的第二项不是一个大字符串。像'HeaderControlGroupRibbonSelectView $ AvailabilitySearchInputRibbonSelectView $ OriginStation'这样的东西本身就是一把钥匙。这也适用于其他非常丑陋的命名键，它们都以'HeaderControlGroupRibbonSelectView $ AvailabilitySearchInputRibbonSelectView $'开头。

此外，您还需要对每个帖子数据项的“键”进行编码，而不仅仅是键的值（因为里面有$ -characters）。使用单独的调用对两侧进行编码，以避免编码赋值'='。

您还需要在原始秒的末尾删除换行符，但现在需要拆分键/值，因为它不在那里。这也适用于第三，第四等项目。

小心解释您在Chrome中看到的内容:-P

另一件事：您所指的网站基于会话：它使用cookie值“ASP.NET_SessionId”跟踪您的交互的当前状态。这个值只是短暂的。一般情况下，您应该首先拨打这个没有此cookie值的网站，并且网站将为您提供（将您重定向到特定国家/地区的本地化页面）。随后，您可以在（第二个）请求中使用其值来获取数据。如果您提供的会话ID无效，则会一次又一次地重定向到同一默认页面。

使用Java提交表单（POST）

1 个答案: