[英]Log in to website from desktop application
我想從Java桌面應用程序登錄網站。 我必須使用OutputStreamWriter
編寫Username
和Password
。 我可以從我的應用程序成功登錄到其他網站,但不能真正登錄。 在分析了該網站的頁面源之后,我發現Username & password
這兩個文本框的ID
隨每次請求和每次頁面刷新而改變。
<input type="text" name="UserName_88515" id="UserName_88515" />
在id
,最后5位數字每次都會更改,因此我決定閱讀頁面源代碼,檢索這5位數字,然后寫憑據以登錄該網站。
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();
}
}
}
為此,我編寫了以下代碼,但出現以下錯誤:
Cannot write output after reading input
查看此問題的答案- 讀取輸入后無法寫輸出。簡短的版本是,基礎HttpURLConnection(conn)無法重用,您需要打開一個新的。
通常,如果對HTTP代碼使用更好的庫(例如HTTPComponents) ,則對yuo來說會更容易
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