/*
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* Copyright 2002-2008 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.walker.infrastructure.utils;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.Reader;
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import java.io.StringWriter;
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import java.io.Writer;
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/**
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* Simple utility methods for file and stream copying.
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* All copy methods use a block size of 4096 bytes,
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* and close all affected streams when done.
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*
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* <p>Mainly for use within the framework,
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* but also useful for application code.
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*
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* @author Juergen Hoeller
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* @since 06.10.2003
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*/
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public abstract class FileCopyUtils {
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public static final int BUFFER_SIZE = 4096;
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//---------------------------------------------------------------------
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// Copy methods for java.io.File
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//---------------------------------------------------------------------
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/**
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* Copy the contents of the given input File to the given output File.
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* @param in the file to copy from
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* @param out the file to copy to
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* @return the number of bytes copied
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* @throws IOException in case of I/O errors
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*/
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public static long copy(File in, File out) throws IOException {
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Assert.notNull(in, "No input File specified");
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Assert.notNull(out, "No output File specified");
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return copy(new BufferedInputStream(new FileInputStream(in)),
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new BufferedOutputStream(new FileOutputStream(out)));
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}
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/**
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* Copy the contents of the given byte array to the given output File.
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* @param in the byte array to copy from
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* @param out the file to copy to
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* @throws IOException in case of I/O errors
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*/
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public static void copy(byte[] in, File out) throws IOException {
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Assert.notNull(in, "No input byte array specified");
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Assert.notNull(out, "No output File specified");
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ByteArrayInputStream inStream = new ByteArrayInputStream(in);
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OutputStream outStream = new BufferedOutputStream(new FileOutputStream(out));
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copy(inStream, outStream);
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}
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/**
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* Copy the contents of the given input File into a new byte array.
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* @param in the file to copy from
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* @return the new byte array that has been copied to
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* @throws IOException in case of I/O errors
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*/
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public static byte[] copyToByteArray(File in) throws IOException {
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Assert.notNull(in, "No input File specified");
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return copyToByteArray(new BufferedInputStream(new FileInputStream(in)));
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}
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//---------------------------------------------------------------------
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// Copy methods for java.io.InputStream / java.io.OutputStream
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//---------------------------------------------------------------------
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/**
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* Copy the contents of the given InputStream to the given OutputStream.
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* Closes both streams when done.
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* @param in 输入流
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* @param out 要拷贝的输出流
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* @param closeOutput 是否立即关闭输出流
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* @return the number of bytes copied
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* @throws IOException in case of I/O errors
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*/
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public static long copy(InputStream in, OutputStream out, boolean closeOutput) throws IOException {
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Assert.notNull(in, "No InputStream specified");
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Assert.notNull(out, "No OutputStream specified");
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try {
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long byteCount = 0;
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byte[] buffer = new byte[BUFFER_SIZE];
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int bytesRead = -1;
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while ((bytesRead = in.read(buffer)) != -1) {
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out.write(buffer, 0, bytesRead);
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byteCount += bytesRead;
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}
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out.flush();
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return byteCount;
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}
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finally {
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try {
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in.close();
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}
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catch (IOException ex) {
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}
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if(closeOutput){
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try {
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out.close();
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}
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catch (IOException ex) {
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}
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}
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}
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}
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public static long copy(InputStream in, OutputStream out) throws IOException{
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return copy(in, out, true);
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}
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/**
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* Copy the contents of the given byte array to the given OutputStream.
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* Closes the stream when done.
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* @param in the byte array to copy from
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* @param out the OutputStream to copy to
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* @throws IOException in case of I/O errors
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*/
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public static void copy(byte[] in, OutputStream out) throws IOException {
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Assert.notNull(in, "No input byte array specified");
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Assert.notNull(out, "No OutputStream specified");
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try {
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out.write(in);
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}
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finally {
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try {
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out.close();
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}
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catch (IOException ex) {
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}
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}
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}
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/**
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* Copy the contents of the given InputStream into a new byte array.
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* Closes the stream when done.
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* @param in the stream to copy from
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* @return the new byte array that has been copied to
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* @throws IOException in case of I/O errors
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*/
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public static byte[] copyToByteArray(InputStream in) throws IOException {
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ByteArrayOutputStream out = new ByteArrayOutputStream(BUFFER_SIZE);
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copy(in, out);
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return out.toByteArray();
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}
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//---------------------------------------------------------------------
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// Copy methods for java.io.Reader / java.io.Writer
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//---------------------------------------------------------------------
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/**
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* Copy the contents of the given Reader to the given Writer.
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* Closes both when done.
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* @param in the Reader to copy from
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* @param out the Writer to copy to
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* @return the number of characters copied
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* @throws IOException in case of I/O errors
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*/
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public static int copy(Reader in, Writer out) throws IOException {
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Assert.notNull(in, "No Reader specified");
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Assert.notNull(out, "No Writer specified");
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try {
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int byteCount = 0;
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char[] buffer = new char[BUFFER_SIZE];
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int bytesRead = -1;
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while ((bytesRead = in.read(buffer)) != -1) {
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out.write(buffer, 0, bytesRead);
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byteCount += bytesRead;
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}
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out.flush();
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return byteCount;
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}
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finally {
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try {
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in.close();
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}
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catch (IOException ex) {
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}
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try {
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out.close();
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}
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catch (IOException ex) {
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}
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}
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}
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/**
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* Copy the contents of the given String to the given output Writer.
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* Closes the write when done.
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* @param in the String to copy from
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* @param out the Writer to copy to
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* @throws IOException in case of I/O errors
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*/
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public static void copy(String in, Writer out) throws IOException {
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Assert.notNull(in, "No input String specified");
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Assert.notNull(out, "No Writer specified");
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try {
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out.write(in);
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}
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finally {
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try {
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out.close();
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}
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catch (IOException ex) {
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}
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}
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}
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/**
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* Copy the contents of the given Reader into a String.
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* Closes the reader when done.
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* @param in the reader to copy from
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* @return the String that has been copied to
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* @throws IOException in case of I/O errors
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*/
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public static String copyToString(Reader in) throws IOException {
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StringWriter out = new StringWriter();
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copy(in, out);
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return out.toString();
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}
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}
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