Android examples for File Input Output:OutputStream
Writes bytes from a byte[] to an OutputStream.
/*/*from ww w . j a v a2 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.BufferedInputStream; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.CharArrayWriter; import java.io.Closeable; import java.io.EOFException; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.Reader; import java.io.Writer; import java.net.Socket; import java.util.ArrayList; import java.util.Collection; import java.util.List; public class Main{ /** * The default buffer size to use for {@link #copyLarge(InputStream, OutputStream)} and {@link #copyLarge(Reader, Writer)} */ private static final int DEFAULT_BUFFER_SIZE = 1024 * 4; /** * 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 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 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 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 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 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 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 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 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 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 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 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 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)); } } } /** * Get the contents of an <code>InputStream</code> as a String using the default character encoding of the platform. * <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 * @return the requested String * @throws NullPointerException * if the input is null * @throws IOException * if an I/O error occurs */ public static String toString(InputStream input) throws IOException { StringBuilderWriter sw = new StringBuilderWriter(); copy(input, sw); return sw.toString(); } /** * Get the contents of an <code>InputStream</code> as a String 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 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 encoding * the encoding to use, null means platform default * @return the requested String * @throws NullPointerException * if the input is null * @throws IOException * if an I/O error occurs */ public static String toString(InputStream input, String encoding) throws IOException { StringBuilderWriter sw = new StringBuilderWriter(); copy(input, sw, encoding); return sw.toString(); } /** * Get the contents of a <code>Reader</code> as a String. * <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 * @return the requested String * @throws NullPointerException * if the input is null * @throws IOException * if an I/O error occurs */ public static String toString(Reader input) throws IOException { StringBuilderWriter sw = new StringBuilderWriter(); copy(input, sw); return sw.toString(); } /** * Copy bytes from an <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>. * <p> * Large streams (over 2GB) will return a bytes copied value of <code>-1</code> after the copy has completed since the correct number of bytes cannot be returned as an int. For large streams use the <code>copyLarge(InputStream, OutputStream)</code> method. * * @param input * the <code>InputStream</code> to read from * @param output * the <code>OutputStream</code> to write to * @return the number of bytes copied, or -1 if > Integer.MAX_VALUE * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ public static int copy(InputStream input, OutputStream output) throws IOException { long count = copyLarge(input, output); if (count > Integer.MAX_VALUE) { return -1; } return (int) count; } /** * Copy bytes from an <code>InputStream</code> to chars on a <code>Writer</code> using the default character encoding of the platform. * <p> * This method buffers the input internally, so there is no need to use a <code>BufferedInputStream</code>. * <p> * This method uses {@link InputStreamReader}. * * @param input * the <code>InputStream</code> to read from * @param output * the <code>Writer</code> to write to * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ public static void copy(InputStream input, Writer output) throws IOException { InputStreamReader in = new InputStreamReader(input); copy(in, output); } /** * Copy bytes from an <code>InputStream</code> to chars on a <code>Writer</code> using the specified character encoding. * <p> * This method buffers the input internally, so there is no need to use a <code>BufferedInputStream</code>. * <p> * Character encoding names can be found at <a href="http://www.iana.org/assignments/character-sets">IANA</a>. * <p> * This method uses {@link InputStreamReader}. * * @param input * the <code>InputStream</code> to read from * @param output * the <code>Writer</code> to write to * @param encoding * the encoding to use, null means platform default * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ public static void copy(InputStream input, Writer output, String encoding) throws IOException { if (encoding == null) { copy(input, output); } else { InputStreamReader in = new InputStreamReader(input, encoding); copy(in, output); } } /** * Copy chars from a <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>. * <p> * Large streams (over 2GB) will return a chars copied value of <code>-1</code> after the copy has completed since the correct number of chars cannot be returned as an int. For large streams use the <code>copyLarge(Reader, Writer)</code> method. * * @param input * the <code>Reader</code> to read from * @param output * the <code>Writer</code> to write to * @return the number of characters copied, or -1 if > Integer.MAX_VALUE * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ public static int copy(Reader input, Writer output) throws IOException { long count = copyLarge(input, output); if (count > Integer.MAX_VALUE) { return -1; } return (int) count; } /** * Copy chars from a <code>Reader</code> to bytes on an <code>OutputStream</code> using the default character encoding of the platform, and calling flush. * <p> * This method buffers the input internally, so there is no need to use a <code>BufferedReader</code>. * <p> * Due to the implementation of OutputStreamWriter, this method performs a flush. * <p> * This method uses {@link OutputStreamWriter}. * * @param input * the <code>Reader</code> to read from * @param output * the <code>OutputStream</code> to write to * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ 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(); } /** * Copy chars from a <code>Reader</code> to bytes on an <code>OutputStream</code> using the specified character encoding, and calling flush. * <p> * This method buffers the input internally, so there is no need to use a <code>BufferedReader</code>. * <p> * Character encoding names can be found at <a href="http://www.iana.org/assignments/character-sets">IANA</a>. * <p> * Due to the implementation of OutputStreamWriter, this method performs a flush. * <p> * This method uses {@link OutputStreamWriter}. * * @param input * the <code>Reader</code> to read from * @param output * the <code>OutputStream</code> to write to * @param encoding * the encoding to use, null means platform default * @throws NullPointerException * if the input or output is null * @throws IOException * if an I/O error occurs * @since Commons IO 1.1 */ public static void copy(Reader input, OutputStream output, String encoding) throws IOException { if (encoding == null) { copy(input, output); } else { OutputStreamWriter out = new OutputStreamWriter(output, encoding); copy(input, out); // XXX Unless anyone is planning on rewriting OutputStreamWriter, // we have to flush here. out.flush(); } } /** * 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 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 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; } }