好吧，夥計們，所以我最近開發的android應用程序將用戶的ID和密碼保存到SharedPreferences中。現在，當用戶第二次啓動應用程序時，他將通過listView中的幾個選項直接重定向到MainActivity。現在我頭痛不已，這讓我真的很瘋狂。我無法登錄網站並將數據提取到我的手機。我試過使用Http（s）UrlConnection，HttpClient，但它似乎並不適合我。我從POST方法獲得的所有信息都是登錄頁面的源代碼。Android：如何以編程方式登錄網站並從中檢索數據？
現在，有登錄頁面：https://medeine.vgtu.lt/studentams/login.jsp?klb=en
和我的目標頁：https://medeine.vgtu.lt/studentams/pask_stud.jsp < - 我需要從中獲取數據
你有什麼想法或建議/方法/指南/任何事情如何要做到這一點？
爲此，您必須發送兩個POST請求。在第一個請求中，如果成功登錄，則需要發送登錄數據並保存cookie。在第二個請求中，需要發送已保存的cookies並且您可以獲取數據。 數據爲POST格式必須是這樣的：var =值& VAR2 =數值
你的情況：
String data = "studKnNr=login&asmKodas=password";
和URL的請求：https://medeine.vgtu.lt/studentams/submit.jsp
看看下面的代碼：
String data = "studKnNr=login&asmKodas=password";
String loginUrl = "https://medeine.vgtu.lt/studentams/submit.jsp";
String Login = POST_req(loginUrl, data, 10000); /*last parameter is a limit of page content length*/
//And after succcess login you can send second request:
String pageContent = POST_req(someUrl, "", 10000);
//Methods for sending requests and saving cookie:
//(this no needs for changing, can only past to you project)
public String POST_req(String url, String post_data, int len) {
URL addr = null;
try {
addr = new URL(url);
} catch (MalformedURLException e) {
return "Некорректный URL";
}
StringBuffer data = new StringBuffer();
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) addr.openConnection();
} catch (IOException e) {
return "Open connection error";
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", "");
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
set_cookie(conn);
//POST data:
String post_str = post_data;
data.append(post_str);
try {
conn.connect();
} catch (IOException e) {
return "Connecting error";
}
DataOutputStream dataOS = null;
try {
dataOS = new DataOutputStream(conn.getOutputStream());
} catch (IOException e2) {
return "Out stream error";
}
try {
((DataOutputStream) dataOS).writeBytes(data.toString());
} catch (IOException e) {
return "Out stream error 1";
}
/*If redirect: */
int status;
try {
status = conn.getResponseCode();
} catch (IOException e2) {
return "Response error";
}
if (status == HttpURLConnection.HTTP_MOVED_TEMP || status == HttpURLConnection.HTTP_MOVED_PERM || status == HttpURLConnection.HTTP_SEE_OTHER) {
String new_url = conn.getHeaderField("Location");
String cookies = conn.getHeaderField("Set-Cookie");
URL red_url;
try {
red_url = new URL(new_url);
} catch (MalformedURLException e) {
return "Redirect error";
}
try {
conn = (HttpURLConnection) red_url.openConnection();
} catch (IOException e) {
return "Redirect connection error";
}
//conn.setRequestProperty("Content-type", "text/html");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", cookies);
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
}
java.io.InputStream in = null;
try {
in = (java.io.InputStream) conn.getInputStream();
} catch (IOException e) {
return "In stream error";
}
InputStreamReader reader = null;
try {
reader = new InputStreamReader(in, "UTF-8");
} catch (UnsupportedEncodingException e) {
return "In stream error";
}
char[] buf = new char[len];
try {
reader.read(buf);
} catch (IOException e) {
return "In stream error";
}
get_cookie(conn);
return (new String(buf));
}
public void get_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String cook_new;
String COOKIES_HEADER;
if (conn.getHeaderField("Set-Cookie") != null) {
COOKIES_HEADER = "Set-Cookie";
}
else {
COOKIES_HEADER = "Cookie";
}
cook_new = conn.getHeaderField(COOKIES_HEADER);
if (cook_new.indexOf("sid", 0) >= 0) {
SharedPreferences.Editor editor = sh_pref_cookie.edit();
editor.putString("Cookie", cook_new);
editor.commit();
}
}
public void set_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String COOKIES_HEADER = "Cookie";
String cook = sh_pref_cookie.getString(COOKIES_HEADER, "no_cookie");
if (!cook.equals("no_cookie")) {
conn.setRequestProperty(COOKIES_HEADER, cook);
}
}
當然，您必須在異步線程中發送請求。
希望它有幫助。並原諒我的英語不好:)
，如果你想用你的java應用程序登錄美麗，終於登錄了！感謝您的時間和精力。像魅力:) – env
有上與Android PHP的MySQL @這個地址遠程登錄一個很好的教程：
如果它可能是你請投我的答案我會做你問同樣有用，再見
或android系統，那麼你需要嘗試與HTTPPOST
示例代碼：
public class HttpPostExample extends Activity {
TextView content;
EditText fname, email, login, pass;
String Name, Email, Login, Pass;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_http_post_example);
content = (TextView)findViewById(R.id.content);
fname = (EditText)findViewById(R.id.name);
email = (EditText)findViewById(R.id.email);
login = (EditText)findViewById(R.id.loginname);
pass = (EditText)findViewById(R.id.password);
Button saveme=(Button)findViewById(R.id.save);
saveme.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v)
{
try{
// CALL GetText method to make post method call
GetText();
}
catch(Exception ex)
{
content.setText(" url exeption! ");
}
}
});
}
// Create GetText Metod
public void GetText() throws UnsupportedEncodingException
{
// Get user defined values
Name = fname.getText().toString();
Email = email.getText().toString();
Login = login.getText().toString();
Pass = pass.getText().toString();
// Create data variable for sent values to server
String data = URLEncoder.encode("name", "UTF-8")
+ "=" + URLEncoder.encode(Name, "UTF-8");
data += "&" + URLEncoder.encode("email", "UTF-8") + "="
+ URLEncoder.encode(Email, "UTF-8");
data += "&" + URLEncoder.encode("user", "UTF-8")
+ "=" + URLEncoder.encode(Login, "UTF-8");
data += "&" + URLEncoder.encode("pass", "UTF-8")
+ "=" + URLEncoder.encode(Pass, "UTF-8");
String text = "";
BufferedReader reader=null;
// Send data
try
{
// Defined URL where to send data
URL url = new URL("http://androidexample.com/media/webservice/httppost.php");
// Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
// Get the server response
reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
StringBuilder sb = new StringBuilder();
String line = null;
// Read Server Response
while((line = reader.readLine()) != null)
{
// Append server response in string
sb.append(line + "\n");
}
text = sb.toString();
}
catch(Exception ex)
{
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
// Show response on activity
content.setText(text );
}
}
我是從這個網址獲得這個來源url你得到的所有東西都與你的查詢有關。
或者如果你想連接到* FTP登錄*那麼你可以按照婁代碼
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
public class Ftpdemo {
public static void main(String args[]) {
// get an ftpClient object
FTPClient ftpClient = new FTPClient();
ftpClient.setConnectTimeout(300);
FileInputStream inputStream = null;
try {
// pass directory path on server to connect
ftpClient.connect("ftp.mydomain.in");
// pass username and password, returned true if authentication is
// successful
boolean login = ftpClient.login("myusername", "mypassword");
if (login) {
System.out.println("Connection established...");
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
inputStream = new FileInputStream("/home/simmant/Desktop/mypic.png");
boolean uploaded = ftpClient.storeFile("user_screens/test3.png",inputStream);
if (uploaded) {
System.out.println("File uploaded successfully !");
} else {
System.out.println("Error in uploading file !");
}
// logout the user, returned true if logout successfully
boolean logout = ftpClient.logout();
if (logout) {
System.out.println("Connection close...");
}
} else {
System.out.println("Connection fail...");
}
} catch (SocketException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ftpClient.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
什麼方法你所使用的登錄。你是否在webview中加載表單以獲取用戶憑證？ –
好吧，表格說：
您是否認爲使用OAuth協議？登錄後，您可以與服務器交換數據。 –