Example usage for java.io Reader read

List of usage examples for java.io Reader read

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Introduction

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

Prototype

public int read(char cbuf[]) throws IOException

Source Link

Document

Reads characters into an array.

Usage

From source file:Main.java

public static void main(String[] args) {

    String s = "tutorial from java2s.com";

    CharBuffer cb = CharBuffer.allocate(100);

    Reader reader = new StringReader(s);

    try {//from w  ww .  ja  va2  s  .  c  om
        reader.read(cb);

        cb.flip();

        // print the char buffer
        System.out.println(cb.toString());

        reader.close();

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

From source file:Main.java

public static void main(String[] args) throws Exception {
    Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "yourName", "mypwd");

    Statement stmt = conn.createStatement();

    createBlobClobTables(stmt);/*from  ww w  . j a  v  a2 s  .c  o m*/

    PreparedStatement pstmt = conn.prepareStatement("INSERT INTO BlobClob VALUES(40,?,?)");

    File file = new File("blob.txt");
    FileInputStream fis = new FileInputStream(file);
    pstmt.setBinaryStream(1, fis, (int) file.length());

    file = new File("clob.txt");
    fis = new FileInputStream(file);
    pstmt.setAsciiStream(2, fis, (int) file.length());
    fis.close();

    pstmt.execute();

    ResultSet rs = stmt.executeQuery("SELECT * FROM BlobClob WHERE id = 40");
    rs.next();

    java.sql.Blob blob = rs.getBlob(2);
    java.sql.Clob clob = rs.getClob(3);

    byte blobVal[] = new byte[(int) blob.length()];
    InputStream blobIs = blob.getBinaryStream();
    blobIs.read(blobVal);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bos.write(blobVal);
    blobIs.close();

    char clobVal[] = new char[(int) clob.length()];
    Reader r = clob.getCharacterStream();
    r.read(clobVal);
    StringWriter sw = new StringWriter();
    sw.write(clobVal);

    r.close();
    conn.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();

    Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCL", "yourName", "mypwd");

    Statement stmt = conn.createStatement();

    createBlobClobTables(stmt);//from  www . j  a va 2  s  . co  m

    PreparedStatement pstmt = conn.prepareStatement("INSERT INTO BlobClob VALUES(40,?,?)");

    File file = new File("blob.txt");
    FileInputStream fis = new FileInputStream(file);
    pstmt.setBinaryStream(1, fis, (int) file.length());

    file = new File("clob.txt");
    fis = new FileInputStream(file);
    pstmt.setAsciiStream(2, fis, (int) file.length());
    fis.close();

    pstmt.execute();

    ResultSet rs = stmt.executeQuery("SELECT * FROM BlobClob WHERE id = 40");
    rs.next();

    java.sql.Blob blob = rs.getBlob(2);
    java.sql.Clob clob = rs.getClob("myClobColumn");

    byte blobVal[] = new byte[(int) blob.length()];
    InputStream blobIs = blob.getBinaryStream();
    blobIs.read(blobVal);
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    bos.write(blobVal);
    blobIs.close();

    char clobVal[] = new char[(int) clob.length()];
    Reader r = clob.getCharacterStream();
    r.read(clobVal);
    StringWriter sw = new StringWriter();
    sw.write(clobVal);

    r.close();
    conn.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Class.forName("oracle.jdbc.driver.OracleDriver");
    Connection conn = DriverManager.getConnection(url, username, password);
    PreparedStatement stmt = conn.prepareStatement("SELECT name, description, data FROM documents ");
    ResultSet resultSet = stmt.executeQuery();
    while (resultSet.next()) {
        String name = resultSet.getString(1);
        String description = resultSet.getString(2);
        File data = new File("C:\\a.txt");
        Reader reader = resultSet.getCharacterStream(3);
        FileWriter writer = new FileWriter(data);
        char[] buffer = new char[1];
        while (reader.read(buffer) > 0) {
            writer.write(buffer);/*from  w w  w  .  jav  a 2  s.c  o m*/
        }
        writer.close();
    }
    conn.close();
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Connection conn = getConnection();
    Statement st = conn.createStatement();

    st.executeUpdate("create table survey (Id int, b CLOB);");

    PreparedStatement pstmt = conn.prepareStatement("INSERT INTO survey VALUES(1,?)");

    File file = new File("c:/Java_Dev/data.txt");

    FileReader reader = new FileReader(file);
    pstmt.setCharacterStream(1, reader);

    pstmt.execute();/*from   w  w  w.  j a v  a 2  s.  co m*/

    ResultSet resultSet = pstmt.executeQuery("select b from survey ");

    File data = new File("C:\\a.txt");
    Reader dataReader = resultSet.getCharacterStream(1);
    FileWriter writer = new FileWriter(data);
    char[] buffer = new char[1];
    while (dataReader.read(buffer) > 0) {
        writer.write(buffer);
    }
    writer.close();

    reader.close();
    st.close();
    conn.close();
}

From source file:Main.java

public static void main(String[] args) {

    String s = "tutorial from java2s.com";

    Reader reader = new StringReader(s);

    // create a char array to read chars into
    char cbuf[] = new char[5];

    try {/*from   w w  w  .j ava2 s .c o  m*/
        // read characters into an array.
        System.out.println(reader.read(cbuf));

        System.out.println(cbuf);
        reader.close();

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

From source file:GenericClient.java

public static void main(String[] args) throws IOException {
    try {/*w w  w  .j a  v a 2 s  .  c om*/
        // Check the number of arguments
        if (args.length != 2)
            throw new IllegalArgumentException("Wrong number of args");

        // Parse the host and port specifications
        String host = args[0];
        int port = Integer.parseInt(args[1]);

        // Connect to the specified host and port
        Socket s = new Socket(host, port);

        // Set up streams for reading from and writing to the server.
        // The from_server stream is final for use in the inner class below
        final Reader from_server = new InputStreamReader(s.getInputStream());
        PrintWriter to_server = new PrintWriter(s.getOutputStream());

        // Set up streams for reading from and writing to the console
        // The to_user stream is final for use in the anonymous class below
        BufferedReader from_user = new BufferedReader(new InputStreamReader(System.in));
        // Pass true for auto-flush on println()
        final PrintWriter to_user = new PrintWriter(System.out, true);

        // Tell the user that we've connected
        to_user.println("Connected to " + s.getInetAddress() + ":" + s.getPort());

        // Create a thread that gets output from the server and displays
        // it to the user. We use a separate thread for this so that we
        // can receive asynchronous output
        Thread t = new Thread() {
            public void run() {
                char[] buffer = new char[1024];
                int chars_read;
                try {
                    // Read characters from the server until the
                    // stream closes, and write them to the console
                    while ((chars_read = from_server.read(buffer)) != -1) {
                        to_user.write(buffer, 0, chars_read);
                        to_user.flush();
                    }
                } catch (IOException e) {
                    to_user.println(e);
                }

                // When the server closes the connection, the loop above
                // will end. Tell the user what happened, and call
                // System.exit(), causing the main thread to exit along
                // with this one.
                to_user.println("Connection closed by server.");
                System.exit(0);
            }
        };

        // Now start the server-to-user thread
        t.start();

        // In parallel, read the user's input and pass it on to the server.
        String line;
        while ((line = from_user.readLine()) != null) {
            to_server.print(line + "\r\n");
            to_server.flush();
        }

        // If the user types a Ctrl-D (Unix) or Ctrl-Z (Windows) to end
        // their input, we'll get an EOF, and the loop above will exit.
        // When this happens, we stop the server-to-user thread and close
        // the socket.

        s.close();
        to_user.println("Connection closed by client.");
        System.exit(0);
    }
    // If anything goes wrong, print an error message
    catch (Exception e) {
        System.err.println(e);
        System.err.println("Usage: java GenericClient <hostname> <port>");
    }
}

From source file:Main.java

/**
 * Read input from reader and write it to writer until there is no more
 * input from reader./*from   www. j a v a  2  s .  co  m*/
 *
 * @param reader the reader to read from.
 * @param writer the writer to write to.
 * @param buf the char array to use as a bufferx
 */
public static void flow(Reader reader, Writer writer, char[] buf) throws IOException {
    int numRead;
    while ((numRead = reader.read(buf)) >= 0) {
        writer.write(buf, 0, numRead);
    }
}

From source file:Main.java

public static String readIt(InputStream stream, int len) throws IOException, UnsupportedEncodingException {
    Reader reader = null;
    reader = new InputStreamReader(stream, "UTF-8");
    char[] buffer = new char[len];
    reader.read(buffer);
    return new String(buffer);
}

From source file:Main.java

private static String convertStreamToString(InputStream is) {
    Writer writer = new StringWriter();
    char[] buffer = new char[2048];
    try {//from  w w w.  ja  va 2  s . c om
        Reader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        int len;
        while ((len = reader.read(buffer)) != -1) {
            writer.write(buffer, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            is.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return writer.toString();
}