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:Main.java

public static ArrayList<String> getIPAddress() {
    ArrayList<String> address_list = new ArrayList<String>();

    BufferedReader br = null;//from  w  ww  .  ja  v a  2 s  .  c o  m
    try {
        br = new BufferedReader(new FileReader("/proc/net/arp"));
        String line;
        while ((line = br.readLine()) != null) {

            if (line.startsWith("192")) {
                //there exists an ip address
                String[] deviceNetworkInfo = line.split(" ");
                String necessaryInfo[] = new String[6];
                int j = 0;
                for (int i = 0; i < deviceNetworkInfo.length; i++) {
                    if (deviceNetworkInfo[i].length() != 0) {
                        necessaryInfo[j] = deviceNetworkInfo[i];
                        j++;
                    }
                }

                address_list.add(necessaryInfo[0]);

            }

        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //return the value
    return address_list;
}

From source file:Main.java

public static String readTextFile(File f) throws IOException {
    BufferedReader br = null;/*from w w  w  . j a va2 s  . co m*/
    String json = "";
    try {

        String sCurrentLine;
        br = new BufferedReader(new FileReader(f));

        while ((sCurrentLine = br.readLine()) != null) {
            json += sCurrentLine;
        }

    } finally {
        try {
            if (br != null)
                br.close();
        } catch (IOException ex) {
        }
    }
    return json;
}

From source file:Main.java

public static boolean canOpenFile(String d) {
    FileReader f;/*www .ja  v a  2 s .  c om*/
    try {
        f = new FileReader(d);
        f.close();
    } catch (Exception e) {
        return false;
    }
    return true;
}

From source file:Main.java

public static Object invokeFunction(String filepath, String funcname, Object... params) {
    try {//  w  ww. j  a v  a 2s . com
        ScriptEngineManager sem = new ScriptEngineManager();
        ScriptEngine jsEngine = sem.getEngineByName("js");
        jsEngine.eval(new FileReader(filepath));
        Invocable invocable = (Invocable) jsEngine;
        return invocable.invokeFunction(funcname, params);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static float[][] readMatrix(String path) throws FileNotFoundException {
    int n = 0, p = 0;
    System.err.println("Load matrix from " + path);
    Scanner sc = new Scanner(new BufferedReader(new FileReader(path)));
    while (sc.hasNext()) {
        String line = sc.nextLine();
        if (line.startsWith("%")) {
            System.err.println(line);
        } else {/*  w w  w .  ja  v  a 2s  .  c  om*/
            String[] dim = line.split(" ");
            n = Integer.parseInt(dim[0]);
            p = Integer.parseInt(dim[1]);
            System.err.println("num rows: " + n + "\n" + "num cols: " + p);
            break;
        }
    }
    int count = 0;
    float[][] mat = new float[p][n];
    int row = 0, col = 0;
    while (sc.hasNextLine()) {
        String line = sc.nextLine();
        if (line.isEmpty()) {
            break;
        }
        Float val = Float.parseFloat(line);
        mat[col][row] = val;
        row++;
        if (row == n) {
            row = 0;
            col++;
        }
        count++;
    }
    if (count != n * p) {
        System.err.println("Parse fail: not enough elements. num rows: " + n + "\n" + "num cols: " + p
                + "\n nun elements: " + count);
        return null;
    }
    System.err.println("Done.");
    return mat;
}

From source file:Main.java

public static List<String> readFileToList(String filepath) {
    List<String> data = new ArrayList<String>();

    try {/*from   ww w .  ja v a  2  s  . c  o m*/
        File file = new File(filepath);
        FileReader fileReader = new FileReader(file);
        BufferedReader bufferedReader = new BufferedReader(fileReader);

        String temp;
        while ((temp = bufferedReader.readLine()) != null) {
            data.add(temp);
        }

        bufferedReader.close();

    } catch (IOException e) {
        e.printStackTrace();
    }

    return data;
}

From source file:Main.java

public static double[][] readMatrixDouble(String path) throws FileNotFoundException {
    int n = 0, p = 0;
    System.err.println("Load matrix from " + path);
    Scanner sc = new Scanner(new BufferedReader(new FileReader(path)));
    while (sc.hasNext()) {
        String line = sc.nextLine();
        if (line.startsWith("%")) {
            System.err.println(line);
        } else {/*from  w ww.  j  a va 2 s .  c  o  m*/
            String[] dim = line.split(" ");
            n = Integer.parseInt(dim[0]);
            p = Integer.parseInt(dim[1]);
            System.err.println("num rows: " + n + "\n" + "num cols: " + p);
            break;
        }
    }
    int count = 0;
    double[][] mat = new double[p][n];
    int row = 0, col = 0;
    while (sc.hasNextLine()) {
        String line = sc.nextLine();
        if (line.isEmpty()) {
            break;
        }
        Double val = Double.parseDouble(line);
        mat[col][row] = val;
        row++;
        if (row == n) {
            row = 0;
            col++;
        }
        count++;
    }
    if (count != n * p) {
        System.err.println("Parse fail: not enough elements. num rows: " + n + "\n" + "num cols: " + p
                + "\n nun elements: " + count);
        return null;
    }
    System.err.println("Done.");
    return mat;
}

From source file:Main.java

@SuppressWarnings("unused")
public static <T> T parseFromFile(Class<T> cls, String filePath)
        throws JsonSyntaxException, FileNotFoundException {
    return gson.fromJson(new BufferedReader(new FileReader(filePath)), cls);
}

From source file:Main.java

public static String getTotalMemory(Context context) {
    String str1 = "/proc/meminfo";
    String str2;/*from  www  . j  av  a2  s  .  c o m*/
    String[] arrayOfString;
    long initial_memory = 0;
    try {
        FileReader localFileReader = new FileReader(str1);
        BufferedReader localBufferedReader = new BufferedReader(localFileReader, 8192);
        str2 = localBufferedReader.readLine();
        arrayOfString = str2.split("\\s+");
        //            for (String num : arrayOfString) {
        //                Log.i(str2, num + "\t");
        //            }
        initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;
        localBufferedReader.close();
    } catch (IOException e) {
    }
    return Formatter.formatFileSize(context, initial_memory);
}

From source file:Main.java

public static String getFile(final String filename) {
    String s = "";
    final File f = new File(filename);

    if (f.exists() && f.canRead()) {
        try {//  w  w w.  j  a  v  a  2s. c  om
            final BufferedReader br = new BufferedReader(new FileReader(f), 256);
            String buffer = null;
            while ((buffer = br.readLine()) != null) {
                s += buffer + "\n";
            }

            br.close();
        } catch (final Exception e) {
            Log.e(TAG, "Error reading file: " + filename, e);
            s = null;
        }
    }
    return s;
}