我有一个Android应用程序，它显示了我从服务器获取信息的故障单的创建日期。
问题是当我尝试使用SimpleDateFormat解析它时，我无法解析我得到的字符串
这是我从服务器获得的：
2017-07-04 23:59:51.486559-05
这是我用来解析它的格式：
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSX", Locale.ENGLISH);
我采用这种方法的例外是：
java.lang.IllegalArgumentException: Unknown pattern character 'X'
at java.text.SimpleDateFormat.validatePatternCharacter(SimpleDateFormat.java:323)
at java.text.SimpleDateFormat.validatePattern(SimpleDateFormat.java:312)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:365)
at com.unipagos.app.wallet.payment.receipts.datamodels.PaymentReceipt.dateFromString(PaymentReceipt.java:320)
我已经在那里待了好几个小时了，我也试过了
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ", Locale.ENGLISH);
无济于事，获得此例外：
java.text.ParseException: Unparseable date: "2016-05-30 20:41:19.934959+00" (at offset 23)
at java.text.DateFormat.parse(DateFormat.java:579)
at com.unipagos.app.wallet.payment.receipts.datamodels.PaymentReceipt.dateFromString(PaymentReceipt.java:326)
at com.unipagos.app.wallet.payment.receipts.datamodels.PaymentReceipt.loadReceiptJSONObject(PaymentReceipt.java:164)
at com.unipagos.app.history.HistoryListFragment.populateTransactionList(HistoryListFragment.java:371)
at com.unipagos.app.history.HistoryListFragment.access$3200(HistoryListFragment.java:83)
我错过了什么吗？
答案 0 :(得分：3)
SimpleDateFormat无法解析您的日期时间字符串。该字符串有微秒（秒数为6位小数），其中Date仅支持毫秒（3位小数）。
因此，这似乎是您放弃过时的过时课程SimpleDateFormat和 DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSSSSSX", Locale.ENGLISH);
OffsetDateTime odt = OffsetDateTime.parse(creationDateFromServer, dtf);
System.out.println(odt);
的好机会。一般经验表明，现代Java日期和时间API可以更好地使用。对于Android，您可以在 ThreeTenABP 中找到它，链接如下。当你知道如何时，其余的都很简单：
2017-07-04T23:59:51.486559-05:00
打印
2017-07-04 23:59:51.486559-05这与您的输入toString()一致。顺便说一下，印刷的字符串是ISO 8601;这就是现代类'Z方法产生的结果。
如果你坚持坚持过时的类，一个方法就是去除最后三位小数，这样只有三位小时，为时区偏移添加两位数，所以有四位，并使用 creationDateFromServer = creationDateFromServer
.replaceFirst("(\\.\\d{3})\\d{3}((?:\\+|-)\\d{2})$", "$1$200");
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ", Locale.ENGLISH);
try {
Date d = df.parse(creationDateFromServer);
System.out.println(d);
} catch (ParseException pe) {
System.out.println(pe + " at offset " + pe.getErrorOffset());
}
解析它：
Wed Jul 05 06:59:51 CEST 2017
请注意阅读正则表达式有多难。如果偏移量达到例如+0530一天，这将会中断。输出是：
Date我的本地时区Date 打印，在这种情况下偏移+0200，因此打印时间与前一天的23：59：51.486-0500一致。这意味着 @Override
protected void onResume() {
super.onResume();
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter != null) {
if (!mBluetoothAdapter.isEnabled())
{
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
} else {
scanAndPairDevice();
}
} else {
// TODO Android Device doesnt Support Bluetooth
}
}
private void scanAndPairDevice() {
if (isDevicePaired()) {
receiveDataFromDevice();
} else {
if(flag!=1) {
showAlertDialog(mContext, "SPLTECH Device is not paired!", "Please pair the device to connect", 1);
}
else {
showAlertDialog(mContext, "SPLTECH Device is not registered!", "Please conect with a registered device", 3);
}
//getDeviceListFromServer();
}
}
private boolean isDevicePaired() {
Set<BluetoothDevice> bluetoothDeviceSet = mBluetoothAdapter.getBondedDevices();
if (bluetoothDeviceSet.size() > 0) {
Set<String> set=mSesssion.getDeviceList();
Iterator<BluetoothDevice> iT=bluetoothDeviceSet.iterator();
while(iT.hasNext()){
BluetoothDevice device=iT.next();
for(String device1: set)
{
if(device.getName().equals("SPLTECH"))
{
flag=1;
}
if(device.getAddress().equals(device1))
{
mDevice = device;
mSesssion.setDeviceMacId(device.getAddress());
return true;
}
}
}
}
return false;
}
private void receiveDataFromDevice() {
mProgressBar.setVisibility(View.GONE);
mHint.setVisibility(View.VISIBLE);
Toast.makeText(mContext, "Now,Bluetooth is Ready to Take Value From Device..!", Toast.LENGTH_SHORT).show();
myThreadConnectBTdevice = new ThreadConnectBTdevice();
myThreadConnectBTdevice.start();
}
private class ThreadConnectBTdevice extends Thread {
private BluetoothSocket bluetoothSocket = null;
private ThreadConnectBTdevice() {
try {
Log.i("hii","hello");
//bluetoothSocket = mDevice.createRfcommSocketToServiceRecord(myUUID);
Method m = mDevice.getClass().getMethod("createRfcommSocket", new Class[] { int.class });
bluetoothSocket = (BluetoothSocket) m.invoke(mDevice, 1);
} catch (Exception e) {
// TODO Auto-generated catch block
Log.i("hii","hello");
e.printStackTrace();
}
}
@Override
public void run() {
boolean success = false;
try {
bluetoothSocket.connect();
success = true;
} catch (IOException e)
{
e.printStackTrace();
final String eMessage = e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
// textStatus.setText("something wrong bluetoothSocket.connect(): \n" + eMessage);
}
});
try{
bluetoothSocket.close();
}
catch (IOException ex)
{
}
}
if (success) {
//connect successful
startThreadConnected(bluetoothSocket);
} else {
//fail
Log.i("hii","in false");
}
}
public void cancel() {
try {
bluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private void startThreadConnected(BluetoothSocket socket) {
myThreadConnected = new ThreadConnected(socket);
myThreadConnected.start();
}
/*
ThreadConnected:
Background Thread to handle Bluetooth data communication
after connected
*/
private class ThreadConnected extends Thread {
private final BluetoothSocket connectedBluetoothSocket;
private final InputStream connectedInputStream;
private final OutputStream connectedOutputStream;
public ThreadConnected(BluetoothSocket socket) {
connectedBluetoothSocket = socket;
InputStream in = null;
OutputStream out = null;
try {
in = socket.getInputStream();
out = socket.getOutputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
connectedInputStream = in;
connectedOutputStream = out;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = connectedInputStream.read(buffer);
final String strReceived = new String(buffer, 0, bytes);
Log.d("abc", strReceived);
Message readMsg = mHandler.obtainMessage(
DATA_FROM_DEVICE, strReceived);
readMsg.sendToTarget();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
final String msgConnectionLost = "Connection lost:\n"
+ e.getMessage();
runOnUiThread(new Runnable() {
@Override
public void run() {
mHint.setText(msgConnectionLost);
}
});
break;
}
}
}
public void write(byte[] buffer) {
try {
connectedOutputStream.write(buffer);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void cancel() {
try {
connectedBluetoothSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
对象内部保持正确的时间点。