Description
Copy chars from a large (over 2GB)
Reader to a
Writer.
License
Apache License
Parameter
| Parameter | Description |
|---|
| input | the <code>Reader</code> to read from |
| output | the <code>Writer</code> to write to |
Exception
| Parameter | Description |
|---|
| NullPointerException | if the input or output is null |
Return
the number of characters copied
Declaration
public static long copyLarge(Reader input, Writer output) throws IOException
Method Source Code
//package com.java2s;
/*/* ww w . j av a 2 s. c o m*/
* 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.*;
public class Main {
/**
* The default buffer size to use for
* {@link #copyLarge(java.io.InputStream, java.io.OutputStream)}
* and
* {@link #copyLarge(java.io.Reader, java.io.Writer)}
*/
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Copy bytes from a large (over 2GB) <code>InputStream</code> to an
* <code>OutputStream</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedInputStream</code>.
*
* @param input the <code>InputStream</code> to read from
* @param output the <code>OutputStream</code> to write to
* @return the number of bytes copied
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(InputStream input, OutputStream output) throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Copy chars from a large (over 2GB) <code>Reader</code> to a <code>Writer</code>.
* <p>
* This method buffers the input internally, so there is no need to use a
* <code>BufferedReader</code>.
*
* @param input the <code>Reader</code> to read from
* @param output the <code>Writer</code> to write to
* @return the number of characters copied
* @throws NullPointerException if the input or output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.3
*/
public static long copyLarge(Reader input, Writer output) throws IOException {
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
long count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Writes bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, OutputStream output) throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
* using the default character encoding of the platform.
* <p>
* This method uses {@link String#String(byte[])}.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, Writer output) throws IOException {
if (data != null) {
output.write(new String(data));
}
}
/**
* Writes bytes from a <code>byte[]</code> to chars on a <code>Writer</code>
* using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#String(byte[], String)}.
*
* @param data the byte array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(byte[] data, Writer output, String encoding) throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(new String(data, encoding));
}
}
}
/**
* Writes chars from a <code>char[]</code> to a <code>Writer</code>
* using the default character encoding of the platform.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, Writer output) throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes chars from a <code>char[]</code> to bytes on an
* <code>OutputStream</code>.
* <p>
* This method uses {@link String#String(char[])} and
* {@link String#getBytes()}.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, OutputStream output) throws IOException {
if (data != null) {
output.write(new String(data).getBytes());
}
}
/**
* Writes chars from a <code>char[]</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#String(char[])} and
* {@link String#getBytes(String)}.
*
* @param data the char array to write, do not modify during output,
* null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(char[] data, OutputStream output, String encoding) throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(new String(data).getBytes(encoding));
}
}
}
/**
* Writes chars from a <code>CharSequence</code> to a <code>Writer</code>.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, Writer output) throws IOException {
if (data != null) {
write(data.toString(), output);
}
}
/**
* Writes chars from a <code>CharSequence</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform.
* <p>
* This method uses {@link String#getBytes()}.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, OutputStream output) throws IOException {
if (data != null) {
write(data.toString(), output);
}
}
/**
* Writes chars from a <code>CharSequence</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#getBytes(String)}.
*
* @param data the <code>CharSequence</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 2.0
*/
public static void write(CharSequence data, OutputStream output, String encoding) throws IOException {
if (data != null) {
write(data.toString(), output, encoding);
}
}
/**
* Writes chars from a <code>String</code> to a <code>Writer</code>.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>Writer</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, Writer output) throws IOException {
if (data != null) {
output.write(data);
}
}
/**
* Writes chars from a <code>String</code> to bytes on an
* <code>OutputStream</code> using the default character encoding of the
* platform.
* <p>
* This method uses {@link String#getBytes()}.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, OutputStream output) throws IOException {
if (data != null) {
output.write(data.getBytes());
}
}
/**
* Writes chars from a <code>String</code> to bytes on an
* <code>OutputStream</code> using the specified character encoding.
* <p>
* Character encoding names can be found at
* <a href="http://www.iana.org/assignments/character-sets">IANA</a>.
* <p>
* This method uses {@link String#getBytes(String)}.
*
* @param data the <code>String</code> to write, null ignored
* @param output the <code>OutputStream</code> to write to
* @param encoding the encoding to use, null means platform default
* @throws NullPointerException if output is null
* @throws java.io.IOException if an I/O error occurs
* @since Commons IO 1.1
*/
public static void write(String data, OutputStream output, String encoding) throws IOException {
if (data != null) {
if (encoding == null) {
write(data, output);
} else {
output.write(data.getBytes(encoding));
}
}
}
}
Related
- copyLarge(Reader input, Writer output)
- copyLarge(Reader input, Writer output)
- copyLarge(Reader input, Writer output)
- copyLarge(Reader input, Writer output)
- copyLarge(Reader input, Writer output)
- copyLarge(Reader input, Writer output, char[] buffer)
- copyLarge(Reader input, Writer output, char[] buffer)
- copyLarge(Reader input, Writer output, char[] buffer)
- copyLarge(Reader input, Writer output, final long inputOffset, final long length, char[] buffer)