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我想从我的Java桌面应用程序登录到网站。我一直在使用OutputStreamWriter
写Username
& Password
。我可以从我的应用程序成功登录到其他网站,但不是我真正想要的那个。分析该网站的网页源代码后,我发现,那两个文本框ID
为Username & password
变化与每一个请求,每次刷新页面。日志从桌面应用程序
<input type="text" name="UserName_88515" id="UserName_88515" />
在id
最后5位数字的每一次变化,所以我决定阅读网页源代码,检索这些五个数字,然后写凭据登录到该网站。
public class LoginHandler {
static boolean isLoggedIn = false;
static String responseText, myText;
public void login(String usrname, String password, String cookys, String sessionCode) {
try {
URL url = new URL("http://www.somewebsite.com/home.php?session="
+ sessionCode);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("GET");
conn.setRequestProperty("User-Agent",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0");
conn.setRequestProperty("Cookie", cookys);
conn.setDoOutput(true);
final BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
final StringBuilder response = new StringBuilder();
myText = response.toString();
String line;
while ((line = rd.readLine()) != null) {
response.append(line);
}
rd.close();
final String text1 = response.toString();
final int starIndex = text1.indexOf("UserName_");
final int endIndex = starIndex + 15;
System.err.println("This is starIndex" + starIndex);
System.err.println("This is endIndex" + endIndex);
final String avc = text1.substring(starIndex, endIndex);
System.err.println("This is avc\n" + avc);
final String fin = avc.substring(10, 15);
System.err.println("This is fin\n" + fin);
final String data1 = URLEncoder.encode("MessageLength", "UTF-8")
+ "=" + URLEncoder.encode("140", "UTF-8") + "&"
+ URLEncoder.encode("UserName_" + fin, "UTF-8") + "="
+ URLEncoder.encode("username", "UTF-8") + "&"
+ URLEncoder.encode("Password_" + fin, "UTF-8") + "="
+ URLEncoder.encode("password", "UTF-8") + "&"
+ URLEncoder.encode("LoginNowbtnDiv", "UTF-8") + "="
+ URLEncoder.encode("Login Now", "UTF-8") + "&"
+ URLEncoder.encode("LoginNow", "UTF-8") + "="
+ URLEncoder.encode("Login Now", "UTF-8");
System.err.println("THIS IS Data1:\n " + data1);
final OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data1);
wr.flush();
final BufferedReader rd1 = new BufferedReader(new InputStreamReader(conn.getInputStream()));
final StringBuilder response1 = new StringBuilder();
String line1;
while ((line1 = rd1.readLine()) != null) {
response1.append(line1);
}
final String text2 = response1.toString();
System.err.println("This is second response\n" + text2);
rd1.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
对于我写了下面的代码,但我得到以下错误:
Cannot write output after reading input
我不能这样做,因为,如果你读过我的整个问题,你会发现更容易使用'ID文本框的内容将随新请求再次发生变化。所以如果我打开一个新的连接,我之前检索的ID将无用 –
http连接和http会话之间有区别。你可以打开一个新的连接映射到同一个会话服务器端(这些标识符被保留在那里) – radai
你没有明白我的观点。即使我在同一个会话中“刷新”网页,“ID”的值也会发生变化。 –