Copy the contents of the given InputStream to the given OutputStream. - Java java.io

Java examples for java.io:InputStream Read

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Description

Copy the contents of the given InputStream to the given OutputStream.

Demo Code


//package com.java2s;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;

import java.io.Writer;

public class Main {
    public static final int BUFFER_SIZE = 4096;

    /**//w  ww .  j  a v  a  2s .  c  o  m
     * Copy the contents of the given InputStream to the given OutputStream.
     * Closes both streams when done.
     * @param in the stream to copy from
     * @param out the stream to copy to
     * @return the number of bytes copied
     * @throws IOException in case of I/O errors
     */
    public static int copy(InputStream in, OutputStream out)
            throws IOException {
        try {
            int byteCount = 0;
            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;

            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
                byteCount += bytesRead;
            }
            out.flush();
            return byteCount;
        } finally {
            boolean isE = false;
            try {
                in.close();
            } catch (IOException ex) {
                isE = true;
            }
            try {
                out.close();
            } catch (IOException ex) {
                isE = true;
            }

            if (isE) {
                throw new IOException("close error on file copy ");
            }
        }
    }

    /**
     * Copy the contents of the given byte array to the given OutputStream.
     * Closes the stream when done.
     * @param in the byte array to copy from
     * @param out the OutputStream to copy to
     * @throws IOException in case of I/O errors
     */
    public static void copy(byte[] in, OutputStream out) throws IOException {
        try {
            out.write(in);
        } finally {
            try {
                out.close();
            } catch (IOException ex) {
            }
        }
    }

    /**
     * Copy the contents of the given Reader to the given Writer.
     * Closes both when done.
     * @param in the Reader to copy from
     * @param out the Writer to copy to
     * @return the number of characters copied
     * @throws IOException in case of I/O errors
     */
    public static int copy(Reader in, Writer out) throws IOException {
        try {
            int byteCount = 0;
            char[] buffer = new char[BUFFER_SIZE];
            int bytesRead = -1;
            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
                byteCount += bytesRead;
            }
            out.flush();
            return byteCount;
        } finally {
            try {
                in.close();
            } catch (IOException ex) {
            }
            try {
                out.close();
            } catch (IOException ex) {
            }
        }
    }

    /**
     * Copy the contents of the given String to the given output Writer.
     * Closes the write when done.
     * @param in the String to copy from
     * @param out the Writer to copy to
     * @throws IOException in case of I/O errors
     */
    public static void copy(String in, Writer out) throws IOException {
        try {
            out.write(in);
        } finally {
            try {
                out.close();
            } catch (IOException ex) {
            }
        }
    }
}

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