Example usage for java.io FileReader read

Introduction

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

Prototype

public int read(char cbuf[], int offset, int length) throws IOException 

Source Link

Document

Reads characters into a portion of an array.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    File f = new File("hello.txt");
    FileReader fr = new FileReader(f);

    char[] c = new char[(int) f.length()];
    char[] cnew = new char[(int) f.length()];
    StringBuffer sbuf = new StringBuffer();
    fr.read(c, 0, (int) f.length());

    int len = (int) f.length();

    for (int i = 0, j = len - 1; i < len; i++, j--) {
        cnew[i] = c[j];//from  w  w w. j  a  v a2s. c  o m
        sbuf.append(cnew[i]);
    }

    System.out.println(sbuf.toString());
    fr.close();

}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    File f = new File("Main.java");
    FileReader fr = new FileReader(f);

    char[] c = new char[(int) f.length()];
    char[] cnew = new char[(int) f.length()];
    StringBuffer sbuf = new StringBuffer();
    fr.read(c, 0, (int) f.length());

    int len = (int) f.length();

    for (int i = 0, j = len - 1; i < len; i++, j--) {
        cnew[i] = c[j];/*from w  ww. j  a v  a 2 s  .  c o  m*/
        sbuf.append(cnew[i]);
    }

    System.out.println(sbuf.toString());
    fr.close();

}

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From source file:com.dianxin.imessage.common.util.SignUtil.java

public static PrivateKey getPrivateKey(String keypath) {
    if (privateKey != null)
        return privateKey;
    log.debug("???");
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    try {//from w w  w  .  j  a  v a  2s .c  om
        FileReader fileReader = new FileReader(keypath);
        char[] cbuf = new char[40960];
        fileReader.read(cbuf, 0, 40960);
        PEMReader reader = new PEMReader(new StringReader(new String(cbuf)));
        KeyPair keyPair = (KeyPair) reader.readObject();
        privateKey = keyPair.getPrivate();
        reader.close();
    } catch (Exception e) {
        log.warn("??", e);
    }
    return privateKey;
}

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From source file:Main.java

public static String readDeviceUUID(String devicePath) {
    String uuid = null;// w  w  w  .  j  a  va  2  s. c o  m
    File root = new File(devicePath);
    if (root.isDirectory()) {
        File uFile = new File(devicePath, ".uuid");
        FileReader reader = null;
        try {
            char[] buffer = new char[36];
            reader = new FileReader(uFile);
            reader.read(buffer, 0, buffer.length);
            uuid = new String(buffer);
            Log.d(TAG, "readDeviceUUID uuid:" + uuid);
            return uuid;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    return uuid;
}

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From source file:de.uni_rostock.goodod.tools.Configuration.java

private static boolean isXMLConfig(File confFile) throws FileNotFoundException, IOException {
    FileReader reader = new FileReader(confFile);
    char beginning[] = new char[7];
    // we search for "<?xml" but need two additional characters to accommodate a potential BOM
    reader.read(beginning, 0, 7);
    if (('<' == beginning[0]) && ('?' == beginning[1]) && ('x' == beginning[2]) && ('m' == beginning[3])
            && ('l' == beginning[4])) {
        reader.close();/*w w  w .j  a va  2  s . co m*/
        return true;
    }

    // Case with byte order mark:
    if (('<' == beginning[2]) && ('?' == beginning[3]) && ('x' == beginning[4]) && ('m' == beginning[5])
            && ('l' == beginning[6])) {
        reader.close();
        return true;
    }
    reader.close();
    return false;
}

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From source file:org.kepler.Kepler.java

/**
 * read the osextension.txt file and return a hashtable of the properties
 * //from w  w  w.  j  a va 2  s  .  com
 * NOTE this method is duplicated in CompileModules.java. Change both if you
 * change one.
 */
private static Hashtable<String, String> readOSExtensionFile(File f) throws Exception {
    // String newline = System.getProperty("line.separator");
    Hashtable<String, String> properties = new Hashtable<String, String>();
    FileReader fr = new FileReader(f);
    StringBuffer sb = new StringBuffer();
    char[] c = new char[1024];
    int numread = fr.read(c, 0, 1024);
    while (numread != -1) {
        sb.append(c, 0, numread);
        numread = fr.read(c, 0, 1024);
    }
    fr.close();

    String propertiesStr = sb.toString();
    // String[] props = propertiesStr.split(newline);
    String[] props = propertiesStr.split(";");
    for (int i = 0; i < props.length; i++) {
        String token1 = props[i];
        StringTokenizer st2 = new StringTokenizer(token1, ",");
        String key = st2.nextToken();
        String val = st2.nextToken();
        properties.put(key, val);
    }

    return properties;
}

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From source file:com.agloco.util.StringUtil.java

/**
 * Read the contents of a file and place them in
 * a string object./*from w  w  w  .ja v  a  2 s. c  o m*/
 *
 * @param String path to file.
 * @return String contents of the file.
 */
public static String fileContentsToString(String file) {
    String contents = "";

    File f = new File(file);

    if (f.exists()) {
        try {
            FileReader fr = new FileReader(f);
            int size = (int) f.length();
            int len = 0, off = 0;
            char[] template = new char[size];
            do {
                len = fr.read(template, off, size - off);
                if (len > 0)
                    off += len;
            } while (len > 0);
            contents = new String(template);
        } catch (Exception e) {
            System.out.println(e);
            e.printStackTrace();
        }
    }

    return contents;
}

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From source file:org.apache.velocity.test.sql.HsqlDB.java

private String getFileContents(String fileName) throws Exception {
    FileReader fr = null;

    try {/*  w  ww.  jav  a  2  s . co  m*/
        fr = new FileReader(fileName);

        char[] fileBuf = new char[1024];
        StringBuffer sb = new StringBuffer(1000);
        int res = -1;

        while ((res = fr.read(fileBuf, 0, 1024)) > -1) {
            sb.append(fileBuf, 0, res);
        }

        return sb.toString();
    } finally {

        if (fr != null) {
            fr.close();
        }
    }
}

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From source file:com.paxxis.cornerstone.encryption.TripleDESEncryptionHandler.java

public void initialize() {
    if (encryptionKeyFile != null) {
        try {//w ww.j av a2s  .  c  om
            FileReader fr = new FileReader(encryptionKeyFile);
            int cnt;
            char[] cbuf = new char[256];
            StringBuilder builder = new StringBuilder();
            while (-1 != (cnt = fr.read(cbuf, 0, 256))) {
                String s = new String(cbuf, 0, cnt);
                builder.append(s);
            }

            encryptionKey = builder.toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    if (encryptionKey == null) {
        throw new RuntimeException("No Encryption Key");
    }

    try {
        byte[] arrayBytes = encryptionKey.getBytes(UNICODE_FORMAT);
        KeySpec ks = new DESedeKeySpec(arrayBytes);
        SecretKeyFactory skf = SecretKeyFactory.getInstance(DESEDE_ENCRYPTION_SCHEME);
        cipher = Cipher.getInstance(DESEDE_ENCRYPTION_SCHEME);
        key = skf.generateSecret(ks);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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From source file:org.qedeq.base.io.IoUtility.java

/**
 * Reads contents of a file into a string buffer. Uses default encoding.
 *
 * @param   file        This file will be loaded.
 * @param   buffer      Buffer to fill with file contents.
 * @throws  IOException File exception occurred.
 *
 * @deprecated  Use {@link #loadFile(File, StringBuffer, String)}.
 *//*w ww  .  ja va 2  s  .  c  o  m*/
public static void loadFile(final File file, final StringBuffer buffer) throws IOException {

    final int size = (int) file.length();
    final char[] data = new char[size];
    buffer.setLength(0);
    FileReader in = null;
    try {
        in = new FileReader(file);
        int charsread = 0;
        while (charsread < size) {
            charsread += in.read(data, charsread, size - charsread);
        }
    } finally {
        close(in);
    }
    buffer.insert(0, data);
}

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