Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.Closeable;

import java.io.IOException;
import java.io.InputStream;

import java.io.OutputStream;

import java.io.Reader;

import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.ServerSocket;
import java.net.Socket;

import java.net.URLConnection;
import java.nio.channels.Selector;

public class Main {
    /**
     * Unconditionally close an <code>Reader</code>.
     * <p/>
     * Equivalent to {@link Reader#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   char[] data = new char[1024];
     *   Reader in = null;
     *   try {
     *       in = new FileReader("foo.txt");
     *       in.read(data);
     *       in.close(); //close errors are handled
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(in);
     *   }
     * </pre>
     *
     * @param input the Reader to close, may be null or already closed
     */
    public static void closeQuietly(Reader input) {
        closeQuietly((Closeable) input);
    }

    /**
     * Unconditionally close a <code>Writer</code>.
     * <p/>
     * Equivalent to {@link Writer#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   Writer out = null;
     *   try {
     *       out = new StringWriter();
     *       out.write("Hello World");
     *       out.close(); //close errors are handled
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(out);
     *   }
     * </pre>
     *
     * @param output the Writer to close, may be null or already closed
     */
    public static void closeQuietly(Writer output) {
        closeQuietly((Closeable) output);
    }

    /**
     * Unconditionally close an <code>InputStream</code>.
     * <p/>
     * Equivalent to {@link InputStream#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   byte[] data = new byte[1024];
     *   InputStream in = null;
     *   try {
     *       in = new FileInputStream("foo.txt");
     *       in.read(data);
     *       in.close(); //close errors are handled
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(in);
     *   }
     * </pre>
     *
     * @param input the InputStream to close, may be null or already closed
     */
    public static void closeQuietly(InputStream input) {
        closeQuietly((Closeable) input);
    }

    /**
     * Unconditionally close an <code>OutputStream</code>.
     * <p/>
     * Equivalent to {@link OutputStream#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     * byte[] data = "Hello, World".getBytes();
     *
     * OutputStream out = null;
     * try {
     *     out = new FileOutputStream("foo.txt");
     *     out.write(data);
     *     out.close(); //close errors are handled
     * } catch (IOException e) {
     *     // error handling
     * } finally {
     *     IOUtils.closeQuietly(out);
     * }
     * </pre>
     *
     * @param output the OutputStream to close, may be null or already closed
     */
    public static void closeQuietly(OutputStream output) {
        closeQuietly((Closeable) output);
    }

    /**
     * Unconditionally close a <code>Closeable</code>.
     * <p/>
     * Equivalent to {@link Closeable#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   Closeable closeable = null;
     *   try {
     *       closeable = new FileReader("foo.txt");
     *       // process closeable
     *       closeable.close();
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(closeable);
     *   }
     * </pre>
     *
     * @param closeable the object to close, may be null or already closed
     * @since 2.0
     */
    public static void closeQuietly(Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (IOException ioe) {
            // ignore
        }
    }

    /**
     * Unconditionally close a <code>Socket</code>.
     * <p/>
     * Equivalent to {@link Socket#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   Socket socket = null;
     *   try {
     *       socket = new Socket("http://www.foo.com/", 80);
     *       // process socket
     *       socket.close();
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(socket);
     *   }
     * </pre>
     *
     * @param sock the Socket to close, may be null or already closed
     * @since 2.0
     */
    public static void closeQuietly(Socket sock) {
        if (sock != null) {
            try {
                sock.close();
            } catch (IOException ioe) {
                // ignored
            }
        }
    }

    /**
     * Unconditionally close a <code>Selector</code>.
     * <p/>
     * Equivalent to {@link Selector#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   Selector selector = null;
     *   try {
     *       selector = Selector.open();
     *       // process socket
     *
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(selector);
     *   }
     * </pre>
     *
     * @param selector the Selector to close, may be null or already closed
     * @since 2.2
     */
    public static void closeQuietly(Selector selector) {
        if (selector != null) {
            try {
                selector.close();
            } catch (IOException ioe) {
                // ignored
            }
        }
    }

    /**
     * Unconditionally close a <code>ServerSocket</code>.
     * <p/>
     * Equivalent to {@link ServerSocket#close()}, except any exceptions will be ignored.
     * This is typically used in finally blocks.
     * <p/>
     * Example code:
     * <pre>
     *   ServerSocket socket = null;
     *   try {
     *       socket = new ServerSocket();
     *       // process socket
     *       socket.close();
     *   } catch (Exception e) {
     *       // error handling
     *   } finally {
     *       IOUtils.closeQuietly(socket);
     *   }
     * </pre>
     *
     * @param sock the ServerSocket to close, may be null or already closed
     * @since 2.2
     */
    public static void closeQuietly(ServerSocket sock) {
        if (sock != null) {
            try {
                sock.close();
            } catch (IOException ioe) {
                // ignored
            }
        }
    }

    /**
     * Closes a URLConnection.
     *
     * @param conn the connection to close.
     * @since 2.4
     */
    public static void close(URLConnection conn) {
        if (conn instanceof HttpURLConnection) {
            ((HttpURLConnection) conn).disconnect();
        }
    }
}