好的，大家好，所以我最近在开发Android应用程序，将用户的ID和PASSWORD保存到SharedPreferences。现在，当用户第二次启动应用程序时，他将通过listView中的一些选项直接重定向到MainActivity。而现在我头疼得厉害，它让我变得疯狂。我无法登录网站并将数据提取到手机。我尝试过使用Http（s）UrlConnection，HttpClient，但它似乎并不适合我。我从POST方法获得的只是登录页面的源代码。
现在，有登录页面：https://medeine.vgtu.lt/studentams/login.jsp?klb=en
和我的目标网页：https://medeine.vgtu.lt/studentams/pask_stud.jsp＆lt; - 我需要从那里获取数据
您是否有任何想法或提示/方法/指南/任何如何做到这一点？
答案 0 :(得分：5)
为此，您必须发送两个POST请求。在第一次请求中，如果成功登录，则需要发送登录数据并保存cookie。在第二个请求中，需要发送已保存的cookie，您可以获取数据。 POST的数据必须格式如下：var = value＆amp; var2 = value2
在你的情况下：
String data = "studKnNr=login&asmKodas=password";
请求的网址：https://medeine.vgtu.lt/studentams/submit.jsp
查看以下代码：
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);
}
}
当然你必须在异步线程中发送请求。
希望它有所帮助。请原谅我的英语不好：）
答案 1 :(得分：1)
有一个非常好的远程登录教程用android php mysql @这个地址：
如果它对您有用，请投票给我答案，我会对你的问题做同样的事，再见
答案 2 :(得分：1)
如果你想在java或android中使用你的应用程序登录，那么你需要尝试使用HTTPPOST
示例代码：
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 );
}
}
我从此网址url获取此来源，您可以获得与查询相关的所有内容。
或如果您想连接到* FTP登录* ，那么您可以按照以下代码
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();
}
}
}
}