Here you can find the source of copyLarge(final Reader input, final Writer output)
Reader to a Writer.
| Parameter | Description |
|---|---|
| input | the <code>Reader</code> to read from |
| output | the <code>Writer</code> to write to |
| Parameter | Description |
|---|---|
| NullPointerException | if the input or output is null |
| IOException | if an I/O error occurs |
public static long copyLarge(final Reader input, final Writer output) throws IOException
//package com.java2s; /*//from ww w . j a v a 2 s . c o m * Copyright 2011- Per Wendel * * Licensed 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.IOException; import java.io.Reader; import java.io.Writer; public class Main { /** * The default buffer size to use. */ private static final int DEFAULT_BUFFER_SIZE = 1024 * 4; /** * 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 IOException if an I/O error occurs * @since Commons IO 1.3 */ public static long copyLarge(final Reader input, final 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; } }