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 int removeUnusedLines(String filename, SortedSet<Integer> linesSet) {

    try {//w  w  w  . ja  va2 s . c  om
        BufferedReader br = new BufferedReader(new FileReader(filename));
        //String buffer to store contents of the file
        StringBuffer sb = new StringBuffer("");

        int lineNumber = 1;
        String line;
        Iterator iterator = linesSet.iterator();
        int lineNumberToBeDeleted = (int) iterator.next();

        int count = 0;

        while ((line = br.readLine()) != null) {
            if (lineNumber == lineNumberToBeDeleted) {
                if (iterator.hasNext()) {
                    lineNumberToBeDeleted = (int) iterator.next();
                    count++;
                }
            }

            else {
                sb.append(line + "\n");
            }

            lineNumber++;
        }

        FileWriter fw = new FileWriter(new File(filename));
        //Write entire string buffer into the file
        fw.write(sb.toString());
        fw.close();

        System.err.println("deleted lines" + count);

    } catch (Exception e) {
        System.err.println("error:" + e.getMessage());
        e.printStackTrace();
        return -10;

    }

    return 10;

}

From source file:Main.java

public static String getCpuName() {
    FileReader fr = null;/*from  ww  w. ja  v a 2s.  com*/
    BufferedReader br = null;
    try {
        fr = new FileReader("/proc/cpuinfo");
        br = new BufferedReader(fr);
        String text = br.readLine();
        String[] array = text.split(":\\s+", 2);
        for (int i = 0; i < array.length; i++) {
        }
        return array[1];
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (fr != null)
            try {
                fr.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        if (br != null)
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    }
    return null;
}

From source file:Main.java

private static String readFileAsString(File file) throws IOException {
    String line;/*from w ww  .  ja  v  a 2s  .  c o m*/
    StringBuffer sb = new StringBuffer();
    BufferedReader br = new BufferedReader(new FileReader(file));
    while ((line = br.readLine()) != null) {
        sb.append(line);
    }

    br.close();
    return sb.toString();
}

From source file:Main.java

public static int getLineCount(String path) {
    LineNumberReader lnr = null;/*from w  w  w  . j a  v a  2  s  . c o m*/
    try {
        lnr = new LineNumberReader(new FileReader(new File(path)));
        lnr.skip(Long.MAX_VALUE);
    } catch (FileNotFoundException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    if (lnr == null)
        return 0;
    return lnr.getLineNumber();
}

From source file:Main.java

static Set<Pattern> getFilterFromFile(String filename) {
    try {//from  w  w w .  j  a  v a 2 s  .  com
        BufferedReader br = new BufferedReader(new FileReader(filename));
        Set<Pattern> filter = new HashSet<>();
        String line;
        while ((line = br.readLine()) != null) {
            if (line.trim().equals("")) {
                continue;
            }
            filter.add(Pattern.compile(line.trim().toLowerCase()));
        }
        return filter;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

From source file:Main.java

public static String getMacFromArpCache(String ip) {
    if (ip == null)
        return null;
    BufferedReader br = null;//from  www.j a v  a 2  s . c om
    try {
        br = new BufferedReader(new FileReader("/proc/net/arp"));
        String line;
        while ((line = br.readLine()) != null) {
            String[] splitted = line.split(" +");
            if (splitted != null && splitted.length >= 4 && ip.equals(splitted[0])) {
                // Basic sanity check
                String mac = splitted[3];
                if (mac.matches("..:..:..:..:..:..")) {
                    return mac;
                } else {
                    return null;
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return null;
}

From source file:Utils.java

public static List<String> readLines(File file) throws Exception {
    if (!file.exists()) {
        return new ArrayList<String>();
    }//  w  w w  .  jav a2  s. c o m
    BufferedReader reader = new BufferedReader(new FileReader(file));
    List<String> results = new ArrayList<String>();
    String line = reader.readLine();
    while (line != null) {
        results.add(line);
        line = reader.readLine();
    }
    return results;
}

From source file:Main.java

public static String read(File file) {
    if (!file.exists()) {
        return "";
    }//from w w  w  .j  a  v  a  2 s .  c  o m
    try {
        FileReader reader = new FileReader(file);
        BufferedReader br = new BufferedReader(reader);
        StringBuffer buffer = new StringBuffer();
        String s;
        while ((s = br.readLine()) != null) {
            buffer.append(s);
        }
        return buffer.toString();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return "";
}

From source file:Main.java

public static StringBuilder ReadFileToString(String filename) {
    StringBuilder text = new StringBuilder();
    try {/*from ww  w  .  ja v a2  s .c  om*/
        BufferedReader bProcFS = new BufferedReader(new FileReader(filename));
        String readLine = null;
        while ((readLine = bProcFS.readLine()) != null) {
            text.append(readLine);
            text.append("\n");
        }
        bProcFS.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return text;
}

From source file:Main.java

public static String readFileContents(File file) throws IOException {
    StringBuilder sb = new StringBuilder();
    BufferedReader br = null;/*from ww  w . ja v  a 2  s.c om*/
    try {
        br = new BufferedReader(new FileReader(file));
        String currentLine;

        while ((currentLine = br.readLine()) != null) {
            sb.append(currentLine);
            sb.append('\n');
        }
    } finally {
        if (br != null) {
            br.close();
        }
    }

    return sb.toString();
}