我正在尝试让登录按钮工作，我的目标是：使用用户名和密码（在md5中）将web请求发送到服务器，从服务器接收响应（响应在xml中），将响应保存到文件或其他文件中，并用于下一个请求。我的代码类似于此：
Button login_button = (Button) findViewById(R.id.button_login);
if (login_button != null) {
login_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
EditText username_text =(EditText)findViewById(R.id.username);
String username_string = username_text.getText().toString();
EditText password_text = (EditText) findViewById(R.id.password);
String password_string = password_text.getText().toString();
String md5_pass=MD5.crypt(password_string); // MD5 is a class that encrpts in md5
//File tempFile = new File(Envoirment,"tempFile");
new JSONTask().execute("http://site/Security.php?function=login&user=" + username_string + "&hash=" + md5_pass");
}
});
}
public class JSONTask extends AsyncTask<String,String,String>
{
@Override
protected String doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
String line;
StringBuffer buffer = new StringBuffer();
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
return buffer.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Intent i = new Intent(Login.this, MainActivity.class);
startActivity(i);
try {
BufferedWriter writer = new BufferedWriter(new FileWriter(".\tempFile"));
//writer.write(); i don't know how
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/*else {
Intent i = new Intent(LoginActivity.this, RegisterActivity.class);
startActivity(i);
}*/
}
我的问题似乎出现在AsyncTask中。web响应将有一个令牌，我需要使用它来进行进一步的请求。我得到这个：
Process: try.app, PID: 17322
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
at java.net.InetAddress.lookupHostByName(InetAddress.java:464)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:251)
at java.net.InetAddress.getAllByName(InetAddress.java:229)
at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292)
at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89)
at try.app.Login$JSONTask.doInBackground(Login.java:67)
at try.app.Login$JSONTask.doInBackground(Login.java:57)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
at libcore.io.Posix.getaddrinfo(Native Method)
at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
at java.net.InetAddress.lookupHostByName(InetAddress.java:451)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:251)
at java.net.InetAddress.getAllByName(InetAddress.java:229)
at com.android.okhttp.internal.Dns$1.getAllByName(Dns.java:28)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:216)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:122)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:292)
at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:89)
at try.app.Login$JSONTask.doInBackground(Login.java:67)
try.app.Login$JSONTask.doInBackground(Login.java:57)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: libcore.io.ErrnoException: getaddrinfo failed: EACCES (Permission denied)
清单上有这些：
<uses-permission android:name="android.permissions.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
首先，您不需要来自服务器的令牌来传递给进一步的请求。用户id就足够了。服务器可以检查该用户是否有合适的会话，就像检查令牌的有效性一样。
现在你的问题可能是在你的应用程序中存储信息的位置，无论是用户id还是令牌，这样它就可以用于进一步的请求。如果这是你想知道的，请查看我对"如何：跟踪进度"问卷的回答。
（评审员：请不要将此问题标记为重复问题，因为尚不清楚这是否是问题的核心。）