Example usage for java.io FileReader FileReader

Introduction

In this page you can find the example usage for java.io FileReader FileReader.

Prototype

public FileReader(FileDescriptor fd) 

Source Link

Document

Creates a new FileReader , given the FileDescriptor to read, using the platform's java.nio.charset.Charset#defaultCharset() default charset .

Usage

From source file:MetalModExample.java

public static JComponent makeExamplePane() {
    JTextArea text = new JTextArea();
    try {//from  w ww .  ja v  a  2s. co  m
        text.read(new FileReader("MetalModExample.java"), null);
    } catch (IOException ex) {
    }

    JScrollPane scroll = new JScrollPane(text);
    return scroll;
}

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From source file:Main.java

public static String readLine(String filename) {
    BufferedReader br = null;/*w w  w . j a va 2 s  .co  m*/
    String line = null;
    try {
        br = new BufferedReader(new FileReader(filename), 1024);
        line = br.readLine();
    } catch (IOException e) {
        return null;
    } finally {
        if (br != null) {
            try {
                br.close();
            } catch (IOException e) {
                // ignore
            }
        }
    }
    return line;
}

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From source file:adviewer.util.JSONIO.java

/**
 * Take in file and return one string of json data
 * /*  www  .  j  a  v a2  s  . co  m*/
 * @return
 * @throws IOException
 */
public static String readJSONFile(File inFile) {
    String readFile = "";

    try {
        File fileIn = inFile;

        //if the file is not there then create the file
        if (fileIn.createNewFile()) {
            System.out.println(fileIn + " was created ");
        }

        FileReader fr = new FileReader(fileIn);
        Scanner sc = new Scanner(fr);

        while (sc.hasNext()) {
            readFile += sc.nextLine().trim();
        }

        return readFile;

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    // System.out.println( readFile  );
    return readFile;
}

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From source file:Main.java

public static XMLStreamReader createXMLStreamReader(File file)
        throws FileNotFoundException, XMLStreamException {

    XMLInputFactory factory = XMLInputFactory.newInstance();
    if (factory.isPropertySupported("javax.xml.stream.isValidating")) {
        factory.setProperty("javax.xml.stream.isValidating", Boolean.TRUE);
    }//  w ww.j  a va 2 s  .c o m

    XMLStreamReader reader = factory.createXMLStreamReader(new FileReader(file));

    return reader;
}

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From source file:Main.java

public static int countSubstringOccurrence(File file, String substring) throws IOException {
    int count = 0;
    FileReader input = null;/*from w w w  . ja v  a  2 s.c  om*/
    try {
        int currentSubstringIndex = 0;
        char[] buffer = new char[4096];

        input = new FileReader(file);
        int numRead = input.read(buffer);
        while (numRead != -1) {

            for (char c : buffer) {
                if (c == substring.charAt(currentSubstringIndex)) {
                    currentSubstringIndex++;
                    if (currentSubstringIndex == substring.length()) {
                        count++;
                        currentSubstringIndex = 0;
                    }
                } else {
                    currentSubstringIndex = 0;
                }
            }
            numRead = input.read(buffer);
        }
    } finally {
        closeQuietly(input);
    }
    return count;
}

---

From source file:com.olhcim.engine.Mesh.java

public static Mesh loadMeshFile(String fileName) {
    //load and parse file
    JSONParser parser = new JSONParser();
    Object obj = null;//from   w  w  w .  ja va 2 s .  c  o  m
    try {
        obj = parser.parse(new FileReader(AppMain.class.getResource(fileName).getFile().replace("%20", " ")));
    } catch (IOException ex) {
    } catch (ParseException ex) {
    }
    JSONObject jObj = (JSONObject) obj;

    //load and convert to double array
    Object[] verticesObj = ((JSONArray) jObj.get("positions")).toArray();
    double[] vertices = new double[verticesObj.length];
    for (int i = 0; i < verticesObj.length; i++) {
        vertices[i] = (double) verticesObj[i];
    }

    //load and convert to long array
    Object[] indicesObj = ((JSONArray) jObj.get("indices")).toArray();
    long[] indices = new long[indicesObj.length];
    for (int i = 0; i < indicesObj.length; i++) {
        indices[i] = (long) indicesObj[i];
    }

    int verticesCount = vertices.length / 3;
    int facesCount = indices.length / 3;

    System.out.println("Vertices: " + verticesCount + " Faces: " + facesCount);

    Mesh mesh = new Mesh("", verticesCount, facesCount);

    // Filling the Vertices array of our mesh first
    for (int index = 0; index < verticesCount; index++) {
        float x = (float) vertices[index * 3];
        float y = (float) vertices[index * 3 + 1];
        float z = (float) vertices[index * 3 + 2];
        mesh.vertices[index] = new Vector4f(x, y, z, 1);
    }

    // Then filling the Faces array
    for (int index = 0; index < facesCount; index++) {
        float a = (int) indices[index * 3];
        float b = (int) indices[index * 3 + 1];
        float c = (int) indices[index * 3 + 2];

        mesh.faces[index] = new Vector3f(a, b, c);
    }

    return mesh;
}

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From source file:com.linkedin.pinot.perf.ForwardIndexWriterBenchmark.java

public static void convertRawToForwardIndex(File rawFile) throws Exception {
    List<String> lines = IOUtils.readLines(new FileReader(rawFile));
    int totalDocs = lines.size();
    int max = Integer.MIN_VALUE;
    int maxNumberOfMultiValues = Integer.MIN_VALUE;
    int totalNumValues = 0;
    int data[][] = new int[totalDocs][];
    for (int i = 0; i < lines.size(); i++) {
        String line = lines.get(i);
        String[] split = line.split(",");
        totalNumValues = totalNumValues + split.length;
        if (split.length > maxNumberOfMultiValues) {
            maxNumberOfMultiValues = split.length;
        }//  w  w w  .j  av a  2 s  .c  o m
        data[i] = new int[split.length];
        for (int j = 0; j < split.length; j++) {
            String token = split[j];
            int val = Integer.parseInt(token);
            data[i][j] = val;
            if (val > max) {
                max = val;
            }
        }
    }
    int maxBitsNeeded = (int) Math.ceil(Math.log(max) / Math.log(2));
    int size = 2048;
    int[] offsets = new int[size];
    int bitMapSize = 0;
    File outputFile = new File("output.mv.fwd");

    FixedBitMultiValueWriter fixedBitSkipListSCMVWriter = new FixedBitMultiValueWriter(outputFile, totalDocs,
            totalNumValues, maxBitsNeeded);

    for (int i = 0; i < totalDocs; i++) {
        fixedBitSkipListSCMVWriter.setIntArray(i, data[i]);
        if (i % size == size - 1) {
            MutableRoaringBitmap rr1 = MutableRoaringBitmap.bitmapOf(offsets);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            DataOutputStream dos = new DataOutputStream(bos);
            rr1.serialize(dos);
            dos.close();
            // System.out.println("Chunk " + i / size + " bitmap size:" + bos.size());
            bitMapSize += bos.size();
        } else if (i == totalDocs - 1) {
            MutableRoaringBitmap rr1 = MutableRoaringBitmap.bitmapOf(Arrays.copyOf(offsets, i % size));
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            DataOutputStream dos = new DataOutputStream(bos);
            rr1.serialize(dos);
            dos.close();
            // System.out.println("Chunk " + i / size + " bitmap size:" + bos.size());
            bitMapSize += bos.size();
        }
    }
    fixedBitSkipListSCMVWriter.close();
    System.out.println("Output file size:" + outputFile.length());
    System.out.println("totalNumberOfDoc\t\t\t:" + totalDocs);
    System.out.println("totalNumberOfValues\t\t\t:" + totalNumValues);
    System.out.println("chunk size\t\t\t\t:" + size);
    System.out.println("Num chunks\t\t\t\t:" + totalDocs / size);
    int numChunks = totalDocs / size + 1;
    int totalBits = (totalNumValues * maxBitsNeeded);
    int dataSizeinBytes = (totalBits + 7) / 8;

    System.out.println("Raw data size with fixed bit encoding\t:" + dataSizeinBytes);
    System.out.println("\nPer encoding size");
    System.out.println();
    System.out.println("size (offset + length)\t\t\t:" + ((totalDocs * (4 + 4)) + dataSizeinBytes));
    System.out.println();
    System.out.println("size (offset only)\t\t\t:" + ((totalDocs * (4)) + dataSizeinBytes));
    System.out.println();
    System.out.println("bitMapSize\t\t\t\t:" + bitMapSize);
    System.out.println("size (with bitmap)\t\t\t:" + (bitMapSize + (numChunks * 4) + dataSizeinBytes));

    System.out.println();
    System.out.println("Custom Bitset\t\t\t\t:" + (totalNumValues + 7) / 8);
    System.out.println("size (with custom bitset)\t\t\t:"
            + (((totalNumValues + 7) / 8) + (numChunks * 4) + dataSizeinBytes));
}

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From source file:Main.java

static long getLineCountForFile(File file) throws IOException {
    LineNumberReader in = new LineNumberReader(new FileReader(file));
    long numLines = 0;
    while (in.readLine() != null)
        ;/*from  w w w.  j  a v a2s.c  o  m*/
    numLines = in.getLineNumber();
    in.close();

    return numLines;

}

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From source file:Main.java

/** Forms an <code>InputSource</code> for parsing XML documents
 *  from a file. Assumes a default character encoding. Returns
 *  <code>null</code> if any of the exceptions is thrown.
 *
 * @param file The file./*from   www . ja v a2  s  .co  m*/
 * @return An <code>InputSource</code> representation.
 */
public static InputSource getInputSource(File file) {
    InputSource retVal = null;
    try {
        retVal = new InputSource(new BufferedReader(new FileReader(file)));
    } catch (Exception ex) {
        ex.printStackTrace();
        return null;
    }
    return retVal;
}

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From source file:atualizador.Atualizador.java

private static void VerificarAtualizacao(String MD5FileName, String SistemaFileName, String DiretorioFTP) {
    try {//from w  ww.ja v a  2 s.c  om

        FTPDownload(MD5FileName, DiretorioFTP); //Arquivo TXT com o MD5

        //Le o valor do arquivo
        FileReader arq = new FileReader(MD5FileName);

        BufferedReader lerArq = new BufferedReader(arq);
        String linha = lerArq.readLine();

        String Md5FPT = linha;
        String Md5Local = geraHash(new File(SistemaFileName)); //Mudar o file name 
        if (!ValidaVersao(Md5FPT, Md5Local)) {
            System.out.println("Atualizando");
            FTPDownload(SistemaFileName, DiretorioFTP);
        }

    } catch (NoSuchAlgorithmException | FileNotFoundException ex) {
        Logger.getLogger(Atualizador.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(Atualizador.class.getName()).log(Level.SEVERE, null, ex);
    }
}

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