Reading text file in different encodings

I am trying to build a tool that will display XML files. As some of these files are generated from a stylesheet transform they may have an encoding other than ascii (for example, UTF-8 or UTF-16). The Java InputStreamReader will accept an encoding type but I don't know how to determine what the file is encoded in. I have some code that examines the first byte of the file to make this determination but I am sure there is a better way.
If I do have to look at the start of the file is there a definitive mapping of encoding to binary representation?
Thanks.

Hi Lakshman,
1.Files in application server are called 'Sequential files'. they are also called as 'Dataset'.
2.To handle sequential file we can follow the below said procedures.
   a.  To open sequentioal file:
          OPEN DATASET <FILENAME> FOR { OUTPUT/INPUT/APPENDING}
          IN {TEXT MODE/BINARY MODE}
   b. To process ( reading/writing):
       TRANSFER <FIELD> TO <FILE NAME>,
       READ DATASET <FILENAME> INTO <FIELD>.
  c.  To close:
        CLOSE DATASET <FILENAME>
3. To see  the application files tcode: AL11
4. Download the files from application server to presentation server : CG3Y
5. Presentation server to application server : CG3Z
Regards,
Sakthivel.VT

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    A50.6||Short|Long||01-01-2009|01-01-2009||01-01-2013|09-18-2012|C|
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    Attachments:
    File_IO.vi ‏82 KB

    Well my acquisition code runs perfect. The problem is reading it. I can't seem to read my data no matter what I do. My data gets saved as a string using the array to string vi but I've read that the string to array vi (which I need to convert back to array to read my data) does not work on the pda. I'm using version 8.0. So I was trying to modify the program posted in this discussion so that it would save data from my DAQ. I did that but I still can't read the data after its saved. I really don't know what else to do. All I need to do is read the data on the pda itself. I can't understand why I'm having such a hard time doing that. I found a possible solution on another discussion that talks about parsing the strings because of the bug in the "string to array" vi. However, that lead me to another problem because for some reason, the array indicators or graphs don't function on the pda. When i build the program to the pda or emulator, the array indicators are faded out on the front panel as if the function is not valid. Does this kind of help give a better picture of what I'm trying to do. Simply read data back. Thanks.

  • To read text file using utl_file

    I would like to read test_file_out.txt which is in c:\temp folder.
    create or replace create or replace directory dir_temp as 'c:\temp';
    grant read, write on directory dir_temp to system;
    then when i execute the below code i get the error .
    // to read text file using utl_file
    DECLARE
    FileIn UTL_FILE.FILE_TYPE;
    v_sql VARCHAR2 (1000);
    BEGIN
    FileIn := UTL_FILE.FOPEN ('DIR_TEMP', 'test_file_out.txt', 'R');
    UTL_FILE.PUT_LINE (FileIn, v_sql);
    dbms_output.put_line(v_sql);
    UTL_FILE.FCLOSE (FileIn);
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    ERROR:
    invalid file operation
    i would like to use ult_file only and also can you let me know to read the text file and place its contents in tmp_emp table?

    Are you trying to read the contents of the file into the local variable? Or write the contents of the local variable to the file?
    Your text talks about reading the file. And you open the file in read mode. But then you call the UTL_FILE.PUT_LINE method which, as SomeoneElse points out, attempts to write data to the file. Since the file is open in read-only mode, you cannot write to the file.
    If the goal is really to read from the file, replace the UTL_FILE.PUT_LINE calls with UTL_FILE.GET_LINE. If the goal is really to write to the file, you'll need to open the file in write mode ('W' rather than 'R' in the FOPEN call).
    Justin

  • How to read text file efficiently?

    I use CharBuffer to read text file:
    private List<String> load() throws IOException {
            final String B = "<BODY>";
            final String E = "</BODY>";
            List<String> docs = new ArrayList<String>();
            for (File file : files) {
                FileReader reader = new FileReader(file);
                CharBuffer buffer = CharBuffer.allocate(BSIZE);
                StringBuilder sb = new StringBuilder();
                while (reader.read(buffer) != -1) {
                    char[] dst = new char[buffer.length()];
                    buffer.get(dst);
                    sb.append(dst);
                    buffer.clear();
                String s = sb.toString();
                System.out.println(file + ": " + s.length());
                int start = 0;
                int i, j;
                while ((i = s.indexOf(B, start)) != -1) {
                    j = s.indexOf(E, i + B.length());
                    docs.add(s.substring(i + B.length(), j));
                    start = j + E.length();
                    //System.out.printf("%d %d %d%n", i, j, start);
            return docs;
        }The file size is 1324350, but the code say it is 772802.
    What's wrong with this code?
    I want to read text file as quickly as possible.
    Is this code the right way to read file?
    Should I use FileReader or nio Channel and ByteBuffer?
    Any suggestions are welcome!

    You are reading the file as if it were encoded in UTF-16. Each character uses two bytes so you have half the number of characters as you had bytes.
    The following code reads an entire file in one hit.
        public static String readText(File file) throws IOException {
            byte[] bytes = new byte[(int) file.length()];
            DataInputStream dis = new DataInputStream(new FileInputStream(file));
            try {
                dis.readFully(bytes);
            } finally {
                dis.close();
            return new String(bytes, "UTF-8"); // or whatever your file encoding is.
        }But you can still have less characters than bytes if there are any non ASCII-7 characters.

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