randomaccessfile

Persisting B-Tree nodes to RandomAccessFile

由 大兔子大兔子 提交于 2019-12-08 06:58:33
问题 My project is trying to write a B-Tree. I am having trouble persisting nodes of the tree to a random access file. I am constantly encountering EOFexceptions and StreamCorruptionExceptions . some resources that I am currently using are: Converting any object to a byte array in java https://inaved-momin.blogspot.com/2012/08/understanding-javaiostreamcorruptedexce.html current Problem: reading a link position from a node and then trying to read it from the random access file is causing a

Reading from random access file in Java

由 China☆狼群 提交于 2019-12-08 03:56:55
问题 I am trying to set up a while loop that will read from a RandomAccessFile and stop when it reaches the end of the file. But every time I try running the program I get an error. RandomAccessFile raf = new RandomAccessFile(filename, "rw"); final int EOF = -1; while(raf.readInt() != EOF){ id = raf.readInt(); existingMileage = raf.readInt(); gasCost = raf.readInt(); ndays = raf.readInt(); rate = raf.readInt(); totalCharge = raf.readInt(); discount = raf.readInt(); tax = raf.readInt(); netCharge =

Getting byte offset of line in a text file?

由 谁说我不能喝 提交于 2019-12-07 18:33:59
问题 I have a text file like one two three four five I need to get the offset of each line in the file. How do I do this in Java? I have searched through some of the I/O libraries(like BufferedReader and RandomAccessFile) but I'm unable to find a satisfactory answer to this. Can anyone suggest how to deal with this? 回答1: Another approach would be to count the bytes of each line line this BufferedReader br = null; try { String line; // in my test each character was one byte ArrayList<Integer>

Search for a String (as an byte[]) in a binary stream

由 时光总嘲笑我的痴心妄想 提交于 2019-12-07 15:28:18
问题 Hi Team, I am trying to find a String "Henry" in a binary file and change the String to a different string. FYI the file is the output of serialisation of an object. Original Question here I am new to searching bytes and imagined this code would search for my byte[] and exchange it. But it doesn't come close to working it doesn't even find a match. { byte[] bytesHenry = new String("Henry").getBytes(); byte[] bytesSwap = new String("Zsswd").getBytes(); byte[] seekHenry = new byte[bytesHenry

editing a value in the file p2p_supplicant.conf which is located on /root/data/misc/wifi/p2p_supplicant.conf

由 走远了吗. 提交于 2019-12-02 17:57:47
问题 I am trying to develop a function for editing a value in the root file p2p_supplicant.conf which is located on /root/data/misc/wifi/p2p_supplicant.conf The toast message always showing "File Not Found" my code is: private static final String FILE_PATH = "/root/data/misc/wifi/p2p_supplicant.conf"; private static final String MARKER_LINE = "p2p_oper_channel="; private static final String TEXT_TO_ADD = "11"; public void changeConfig() { String message = String.format("Entering Config Class");

Clear contents of a file in Java using RandomAccessFile

由 ≡放荡痞女 提交于 2019-12-02 12:27:39
I am trying to clear the contents of a file I made in java. The file is created by a PrintWriter call. I read here that one can use RandomAccessFile to do so, and read somewhere else that this is in fact better to use than calling a new PrintWriter and immediately closing it to overwrite the file with a blank one. However, using the RandomAccessFile is not working, and I don't understand why. Here is the basic outline of my code. PrintWriter writer = new PrintWriter("temp","UTF-8"); while (condition) { writer.println("Example text"); if (clearCondition) { new RandomAccessFile("temp","rw")

editing a value in the file p2p_supplicant.conf which is located on /root/data/misc/wifi/p2p_supplicant.conf

由 泪湿孤枕 提交于 2019-12-02 11:32:54
I am trying to develop a function for editing a value in the root file p2p_supplicant.conf which is located on /root/data/misc/wifi/p2p_supplicant.conf The toast message always showing "File Not Found" my code is: private static final String FILE_PATH = "/root/data/misc/wifi/p2p_supplicant.conf"; private static final String MARKER_LINE = "p2p_oper_channel="; private static final String TEXT_TO_ADD = "11"; public void changeConfig() { String message = String.format("Entering Config Class"); Toast.makeText(getApplicationContext(), message,Toast.LENGTH_LONG).show(); List<String> fileLines = new

Java RandomAccessFile.java under linux not working correctly

由 非 Y 不嫁゛ 提交于 2019-12-02 06:54:08
Im trying to implement the simple tail -f linux command in java. Here is my code. try { // position within the file File file = new File("/home/curuk/monitored/log.txt"); RandomAccessFile raFile = new RandomAccessFile(file, "r"); long last = file.lastModified(); // The last time the file was checked for changes long position = file.length(); while (true) { if (file.lastModified() > last) { last = file.lastModified(); readFromFile(raFile, (int) position, (int) (file.length() - position)); position = file.length(); } Thread.sleep(1000); } } catch (IOException e) { e.printStackTrace(); } private

Android: Accessing File from Internal Storage Using RandomAccessFile

由 一个人想着一个人 提交于 2019-12-01 23:17:26
问题 I am creating an app that needs to read data from a file. I was initially reading it from the assets folder using a BufferedReader and an InputStreamReader but I was running into memory issues (see Android: File Reading - OutOfMemory Issue). One suggestion was to copy the data from the assets folder to the internal storage ( not the SD card ) and then access it via RandomAccessFile . So I looked up how to copy files from the assets to internal storage and I found 2 sources: https://groups

Android: Accessing File from Internal Storage Using RandomAccessFile

由 南楼画角 提交于 2019-12-01 22:00:01
I am creating an app that needs to read data from a file. I was initially reading it from the assets folder using a BufferedReader and an InputStreamReader but I was running into memory issues (see Android: File Reading - OutOfMemory Issue ). One suggestion was to copy the data from the assets folder to the internal storage ( not the SD card ) and then access it via RandomAccessFile . So I looked up how to copy files from the assets to internal storage and I found 2 sources: https://groups.google.com/forum/?fromgroups=#!topic/android-developers/RpXiMYV48Ww http://developergoodies.blogspot.com
订阅 randomaccessfile