我想从我的Java桌面应用程序登录网站。我必须写Username
& Password
使用OutputStreamWriter
。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。在分析了该网站的网页来源后,我发现ID
的这两个文本框中的Username & password
随每次请求和每次页面刷新而变化。
<input type="text" name="UserName_88515" id="UserName_88515" />
在id
每次更改后5位数,所以我决定阅读页面源,检索这5位数,然后写入凭据登录该网站。
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();
}
}
}
为此,我编写了以下代码,但是我收到了以下错误:
Cannot write output after reading input
答案 0 :(得分:1)
查看此问题的答案 - Cannot write output after reading input 简短的版本是底层的HttpURLConnection(conn)无法重用,你需要打开一个新的。
一般来说,如果你为你的http代码使用更好的库,对你来说会更容易,比如HTTPComponents