package org.ycl.commons.text;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.math.BigInteger;
import java.net.URL;
import java.nio.channels.FileChannel;
import org.apache.commons.io.IOUtils;
/**
*
* 1. stringToFile/fileToString
* <li>- read String to File, or reserve</li>
* 2. moveFile
* <li>- If we process this file, will be move to archive directory</li>
* 3. getTempDirectory/getUserDirectory
* <li>- return "java.io.tmpdir", "user.home" derectory</li>
* 4. openInputStream
* <li>- open file in InputStream with safe method</li>
* 5. openOutputStream
* <li>- Open out put file in safe method, if parent path is not exists, create it.</li>
* 6. byteCountToDisplaySize
* <li>- get the File Size in human readable.</li>
* 7. touch
* <li>- just open File, modify the date without modify content</li>
* 8. copyFile(File srcFile, File destFile)
* <li>- preserve file modify date is true.</li>
*
* NOTE:this is from my tool box
* {@link org.apache.commons.io.FileUtils}
*
*/
public class FileUtils {
/**
* The number of bytes in a kilobyte.
*/
public static final long ONE_KB = 1024;
/**
* The number of bytes in a megabyte.
*/
public static final long ONE_MB = ONE_KB * ONE_KB;
/**
* The file copy buffer size (30 MB)
*/
private static final long FILE_COPY_BUFFER_SIZE = ONE_MB * 30;
public static long MAXFILESIZE = ONE_MB * 25;//25MB
/**
* write String to file.
*
* @param file
* @param fileContent
* @throws IOException
*/
public static void stringToFile(File file, String fileContent) throws IOException{
if(file != null && !file.isDirectory())
{
if (!file.isFile())
file.createNewFile();
FileOutputStream fs = null;
fs = new FileOutputStream(file);
if (fs != null && fileContent!=null && fileContent.length()!=0) {
if (fileContent.length() > MAXFILESIZE)
throw new RuntimeException("The size of file "
+ file.getName() + " can't exceed " + MAXFILESIZE
+ " bytes");
fs.write(fileContent.getBytes());
fs.flush();
}
fs.close();
} else if (file != null && file.isDirectory()){
throw new RuntimeException(file.getName() + " is a directory.");
}else {
throw new RuntimeException("The target file is null.");
}
}
/**
* read file from disk and convert it to a string
*
* @param file
* @return
* @throws IOException
* @throws PLMInterfaceAppException
*/
public static String fileToString(File file) throws IOException{
String fileString = null;
if(file != null && file.isFile())
{
FileInputStream fs = null;
fs = new FileInputStream(file);
if (fs != null) {
long filesize = file.length();
if (filesize > MAXFILESIZE)
throw new RuntimeException("The size of file "
+ file.getName() + " exceeds " + MAXFILESIZE
+ " bytes");
byte[] content = new byte[(int)filesize];
fs.read(content);
fileString = new String(content);
fs.close();
}
}
return fileString;
}
/**
* read file from disk and convert it to a string
*
* @param file
* @return
* @throws IOException
* @throws PLMInterfaceAppException
*/
public static String fileToString(File file,String encode) throws IOException{
StringBuffer sb = new StringBuffer();
if(file != null && file.isFile())
{
FileInputStream fs = new FileInputStream(file);
BufferedReader in= new BufferedReader(new InputStreamReader(fs,encode));
if (in != null) {
String inputLine;
while ((inputLine = in.readLine()) != null) {
sb.append(inputLine);
}
}
in.close();
}
return sb.toString();
}
/**
* move file to target folder
*
* @param inFile
* @param folder
* @throws Exception
*/
public static void moveFile(File inFile, String folder) throws Exception {
try {
String inFileName = inFile.getName();
// ensure folder has trailing "/"
folder = folder.trim();
if (folder.lastIndexOf("/")+1 != folder.length()) {
folder = folder + "/";
}
File file2 = new File(folder+inFileName);
// Rename file
renameFile(inFile,file2);
} catch (Exception e) {
throw e;
}
}
public static void renameFile(File inFile, File outFile) throws Exception {
try {
if(outFile.exists()) throw new IOException("file already exists: " + outFile);
// Rename file
boolean success = inFile.renameTo(outFile);
if (!success) {
// File was not successfully renamed
throw new Exception("Unable to rename file to: " +outFile);
}
} catch (Exception e) {
throw e;
}
}
/**
* Returns the path to the system temporary directory.
*
* @return the path to the system temporary directory.
*
* @since 2.0
*/
public static String getTempDirectoryPath() {
return System.getProperty("java.io.tmpdir");
}
/**
* Returns a {@link File} representing the system temporary directory.
*
* @return the system temporary directory.
*
* @since 2.0
*/
public static File getTempDirectory() {
return new File(getTempDirectoryPath());
}
/**
* Returns the path to the user's home directory.
*
* @return the path to the user's home directory.
*
* @since 2.0
*/
public static String getUserDirectoryPath() {
return System.getProperty("user.home");
}
/**
* Returns a {@link File} representing the user's home directory.
*
* @return the user's home directory.
*
* @since 2.0
*/
public static File getUserDirectory() {
return new File(getUserDirectoryPath());
}
/**
* Opens a {@link FileInputStream} for the specified file, providing better
* error messages than simply calling <code>new FileInputStream(file)</code>.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* An exception is thrown if the file does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be read.
*
* @param file the file to open for input, must not be {@code null}
* @return a new {@link FileInputStream} for the specified file
* @throws FileNotFoundException if the file does not exist
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be read
* @since 1.3
*/
public static FileInputStream openInputStream(File file) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canRead() == false) {
throw new IOException("File '" + file + "' cannot be read");
}
} else {
throw new FileNotFoundException("File '" + file + "' does not exist");
}
return new FileInputStream(file);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
*
* @param file the file to open for output, must not be {@code null}
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 1.3
*/
public static FileOutputStream openOutputStream(File file) throws IOException {
return openOutputStream(file, false);
}
/**
* Opens a {@link FileOutputStream} for the specified file, checking and
* creating the parent directory if it does not exist.
* <p>
* At the end of the method either the stream will be successfully opened,
* or an exception will have been thrown.
* <p>
* The parent directory will be created if it does not exist.
* The file will be created if it does not exist.
* An exception is thrown if the file object exists but is a directory.
* An exception is thrown if the file exists but cannot be written to.
* An exception is thrown if the parent directory cannot be created.
*
* @param file the file to open for output, must not be {@code null}
* @param append if {@code true}, then bytes will be added to the
* end of the file rather than overwriting
* @return a new {@link FileOutputStream} for the specified file
* @throws IOException if the file object is a directory
* @throws IOException if the file cannot be written to
* @throws IOException if a parent directory needs creating but that fails
* @since 2.1
*/
public static FileOutputStream openOutputStream(File file, boolean append) throws IOException {
if (file.exists()) {
if (file.isDirectory()) {
throw new IOException("File '" + file + "' exists but is a directory");
}
if (file.canWrite() == false) {
throw new IOException("File '" + file + "' cannot be written to");
}
} else {
File parent = file.getParentFile();
if (parent != null) {
if (!parent.mkdirs() && !parent.isDirectory()) {
throw new IOException("Directory '" + parent + "' could not be created");
}
}
}
return new FileOutputStream(file, append);
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size
* the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
* @since 2.4
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(BigInteger size) {
return org.apache.commons.io.FileUtils.byteCountToDisplaySize(size);
}
/**
* Returns a human-readable version of the file size, where the input represents a specific number of bytes.
* <p>
* If the size is over 1GB, the size is returned as the number of whole GB, i.e. the size is rounded down to the
* nearest GB boundary.
* </p>
* <p>
* Similarly for the 1MB and 1KB boundaries.
* </p>
*
* @param size
* the number of bytes
* @return a human-readable display value (includes units - EB, PB, TB, GB, MB, KB or bytes)
* @see <a href="https://issues.apache.org/jira/browse/IO-226">IO-226 - should the rounding be changed?</a>
*/
// See https://issues.apache.org/jira/browse/IO-226 - should the rounding be changed?
public static String byteCountToDisplaySize(long size) {
return byteCountToDisplaySize(BigInteger.valueOf(size));
}
/**
* Implements the same behaviour as the "touch" utility on Unix. It creates
* a new file with size 0 or, if the file exists already, it is opened and
* closed without modifying it, but updating the file date and time.
* <p>
* NOTE: As from v1.3, this method throws an IOException if the last
* modified date of the file cannot be set. Also, as from v1.3 this method
* creates parent directories if they do not exist.
*
* @param file the File to touch
* @throws IOException If an I/O problem occurs
*/
public static void touch(File file) throws IOException {
if (!file.exists()) {
OutputStream out = openOutputStream(file);
IOUtils.closeQuietly(out);
}
boolean success = file.setLastModified(System.currentTimeMillis());
if (!success) {
throw new IOException("Unable to set the last modification time for " + file);
}
}
/**
* Copies a file to a new location preserving the file date.
* <p>
* This method copies the contents of the specified source file to the
* specified destination file. The directory holding the destination file is
* created if it does not exist. If the destination file exists, then this
* method will overwrite it.
* <p>
* <strong>Note:</strong> This method tries to preserve the file's last
* modified date/times using {@link File#setLastModified(long)}, however
* it is not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destFile the new file, must not be {@code null}
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFileToDirectory(File, File)
*/
public static void copyFile(File srcFile, File destFile) throws IOException {
copyFile(srcFile, destFile, true);
}
/**
* Copies a file to a new location.
* <p>
* This method copies the contents of the specified source file
* to the specified destination file.
* The directory holding the destination file is created if it does not exist.
* If the destination file exists, then this method will overwrite it.
* <p>
* <strong>Note:</strong> Setting <code>preserveFileDate</code> to
* {@code true} tries to preserve the file's last modified
* date/times using {@link File#setLastModified(long)}, however it is
* not guaranteed that the operation will succeed.
* If the modification operation fails, no indication is provided.
*
* @param srcFile an existing file to copy, must not be {@code null}
* @param destFile the new file, must not be {@code null}
* @param preserveFileDate true if the file date of the copy
* should be the same as the original
*
* @throws NullPointerException if source or destination is {@code null}
* @throws IOException if source or destination is invalid
* @throws IOException if an IO error occurs during copying
* @see #copyFileToDirectory(File, File, boolean)
*/
public static void copyFile(File srcFile, File destFile,
boolean preserveFileDate) throws IOException {
if (srcFile == null) {
throw new NullPointerException("Source must not be null");
}
if (destFile == null) {
throw new NullPointerException("Destination must not be null");
}
if (srcFile.exists() == false) {
throw new FileNotFoundException("Source '" + srcFile + "' does not exist");
}
if (srcFile.isDirectory()) {
throw new IOException("Source '" + srcFile + "' exists but is a directory");
}
if (srcFile.getCanonicalPath().equals(destFile.getCanonicalPath())) {
throw new IOException("Source '" + srcFile + "' and destination '" + destFile + "' are the same");
}
File parentFile = destFile.getParentFile();
if (parentFile != null) {
if (!parentFile.mkdirs() && !parentFile.isDirectory()) {
throw new IOException("Destination '" + parentFile + "' directory cannot be created");
}
}
if (destFile.exists() && destFile.canWrite() == false) {
throw new IOException("Destination '" + destFile + "' exists but is read-only");
}
doCopyFile(srcFile, destFile, preserveFileDate);
}
/**
* Internal copy file method.
*
* @param srcFile the validated source file, must not be {@code null}
* @param destFile the validated destination file, must not be {@code null}
* @param preserveFileDate whether to preserve the file date
* @throws IOException if an error occurs
*/
private static void doCopyFile(File srcFile, File destFile, boolean preserveFileDate) throws IOException {
if (destFile.exists() && destFile.isDirectory()) {
throw new IOException("Destination '" + destFile + "' exists but is a directory");
}
FileInputStream fis = null;
FileOutputStream fos = null;
FileChannel input = null;
FileChannel output = null;
try {
fis = new FileInputStream(srcFile);
fos = new FileOutputStream(destFile);
input = fis.getChannel();
output = fos.getChannel();
long size = input.size();
long pos = 0;
long count = 0;
while (pos < size) {
count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
pos += output.transferFrom(input, pos, count);
}
} finally {
IOUtils.closeQuietly(output);
IOUtils.closeQuietly(fos);
IOUtils.closeQuietly(input);
IOUtils.closeQuietly(fis);
}
if (srcFile.length() != destFile.length()) {
throw new IOException("Failed to copy full contents from '" +
srcFile + "' to '" + destFile + "'");
}
if (preserveFileDate) {
destFile.setLastModified(srcFile.lastModified());
}
}
public static void main(String args[]) throws Exception{
//System.setProperty("file.encoding","UTF-8");
System.out.println(System.getProperty("file.encoding"));
System.out.println("1:"+fileToString(new File("C:\\weather\\101210101.shtml"),"UTF-8"));
//System.out.println("2:"+fileToString(new File("C:\\weather\\101210101.shtml")));
//moveFile(new File("C:\\Users\\e557400\\Desktop\\all\\newdoc\\Investigate\\java\\commons\\TimeZone.txt"),"C:\\");
//moveFile(new File("C:\\TimeZone.txt"),"C:\\Users\\e557400\\Desktop\\all\\newdoc\\Investigate\\java\\commons");
// System.out.println(getTempDirectoryPath());
// File file = new File("C:\\Users\\e557400\\Desktop\\all\\newdoc\\Investigate\\java\\commons\\TimeZone.txt");
// long size = file.length();
// System.out.println(byteCountToDisplaySize(size));
}
}
commons-io FileUtils Helper
commons-io主要对输入流，输出流的打开和关闭，主要是对文件的copy, 字符串到文件的传输， 其实这个功能对IO的封装还是不错的，我们就不用自己去打开输入流和输出流。
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