Description
Copy chars from a
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 |
|---|
| IOException | In case of an I/O problem |
Return
the number of characters copied
Declaration
public static int copy(Reader input, Writer output) throws IOException
Method Source Code
//package com.java2s;
/*// w ww .ja v 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.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StringReader;
import java.io.Writer;
public class Main {
/**
* The default size of the buffer.
*/
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
/**
* Copy bytes from a <code>byte[]</code> to an <code>OutputStream</code>.
* @param input the byte array to read from
* @param output the <code>OutputStream</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(byte[] input, OutputStream output)
throws IOException {
output.write(input);
}
/**
* Copy and convert bytes from a <code>byte[]</code> to chars on a
* <code>Writer</code>.
* The platform's default encoding is used for the byte-to-char conversion.
* @param input the byte array to read from
* @param output the <code>Writer</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(byte[] input, Writer output) throws IOException {
ByteArrayInputStream in = new ByteArrayInputStream(input);
copy(in, output);
}
/**
* Copy and convert bytes from a <code>byte[]</code> to chars on a
* <code>Writer</code>, using the specified encoding.
* @param input the byte array to read from
* @param output the <code>Writer</code> to write to
* @param encoding The name of a supported character encoding. See the
* <a href="http://www.iana.org/assignments/character-sets">IANA
* Charset Registry</a> for a list of valid encoding types.
* @throws IOException In case of an I/O problem
*/
public static void copy(byte[] input, Writer output, String encoding)
throws IOException {
ByteArrayInputStream in = new ByteArrayInputStream(input);
copy(in, output, encoding);
}
/**
* Copy bytes from an <code>InputStream</code> to an
* <code>OutputStream</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 IOException In case of an I/O problem
*/
public static int copy(InputStream input, OutputStream output)
throws IOException {
byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
int count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Copy chars from a <code>Reader</code> to a <code>Writer</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 IOException In case of an I/O problem
*/
public static int copy(Reader input, Writer output) throws IOException {
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
int count = 0;
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
count += n;
}
return count;
}
/**
* Copy and convert bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code>.
* The platform's default encoding is used for the byte-to-char conversion.
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(InputStream input, Writer output)
throws IOException {
InputStreamReader in = new InputStreamReader(input);
copy(in, output);
}
/**
* Copy and convert bytes from an <code>InputStream</code> to chars on a
* <code>Writer</code>, using the specified encoding.
* @param input the <code>InputStream</code> to read from
* @param output the <code>Writer</code> to write to
* @param encoding The name of a supported character encoding. See the
* <a href="http://www.iana.org/assignments/character-sets">IANA
* Charset Registry</a> for a list of valid encoding types.
* @throws IOException In case of an I/O problem
*/
public static void copy(InputStream input, Writer output,
String encoding) throws IOException {
InputStreamReader in = new InputStreamReader(input, encoding);
copy(in, output);
}
/**
* Serialize chars from a <code>Reader</code> to bytes on an
* <code>OutputStream</code>, and flush the <code>OutputStream</code>.
* @param input the <code>Reader</code> to read from
* @param output the <code>OutputStream</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(Reader input, OutputStream output)
throws IOException {
OutputStreamWriter out = new OutputStreamWriter(output);
copy(input, out);
// XXX Unless anyone is planning on rewriting OutputStreamWriter, we
// have to flush here.
out.flush();
}
/**
* Serialize chars from a <code>String</code> to bytes on an
* <code>OutputStream</code>, and
* flush the <code>OutputStream</code>.
* @param input the <code>String</code> to read from
* @param output the <code>OutputStream</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(String input, OutputStream output)
throws IOException {
StringReader in = new StringReader(input);
OutputStreamWriter out = new OutputStreamWriter(output);
copy(in, out);
// XXX Unless anyone is planning on rewriting OutputStreamWriter, we
// have to flush here.
out.flush();
}
/**
* Copy chars from a <code>String</code> to a <code>Writer</code>.
* @param input the <code>String</code> to read from
* @param output the <code>Writer</code> to write to
* @throws IOException In case of an I/O problem
*/
public static void copy(String input, Writer output) throws IOException {
output.write(input);
}
}
Related
- copy(Reader input, OutputStream output)
- readContents(Reader in)
- readFile(String filename)
- readFileReader(String filePath)
- readTextFile(String fileName)