java文件格式转换

给了个例子，把编码格式为GB2312的文件转换成utf-8格式的文件

package com.hikvision.preplan;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.charset.Charset;

public class FileEncodeTransfer {

private static String sourceEncoding = "GB2312";

private static String targetEncoding = "UTF-8";

public static void changeEncoding(File sourceFile, File targetFile)

throws UnsupportedEncodingException, FileNotFoundException,

IOException {

FileInputStream fin = null;

FileOutputStream fout = null;

FileChannel fcin = null;

FileChannel fcout = null;

if (sourceEncoding == null) {

FileEncodeTransfer.sourceEncoding = System.getProperty("file.encoding");

}

try {

fin = new FileInputStream(sourceFile);

fout = new FileOutputStream(targetFile);

fcin = fin.getChannel();

fcout = fout.getChannel();

ByteBuffer buffer = ByteBuffer.allocateDirect(1024);

while (true) {

buffer.clear();

int r = fcin.read(buffer);

if (r == -1) {

break;

}

buffer.flip();

fcout.write(ByteBuffer.wrap(Charset.forName(sourceEncoding)

.decode(buffer).toString().getBytes(targetEncoding)));

}

} finally {

if (fin != null) {

fin.close();

fin = null;

}

if (fcin != null) {

fcin.close();

fcin = null;

}

if (fout != null) {

fout.close();

fout = null;

}

if (fcout != null) {

fcout.close();

fcout = null;

}

}

}

public static void changeEncoding(String sourceFile, String targetFile) throws UnsupportedEncodingException, FileNotFoundException, IOException{

File fl1 = new File(sourceFile);

File fo1 = new File(targetFile);

changeEncoding(fl1, fo1);

}

public static void changeEncoding(String sourceFile, String targetFile,

String sourceEncoding, String targetEncoding) throws UnsupportedEncodingException, FileNotFoundException, IOException {

FileEncodeTransfer.sourceEncoding = sourceEncoding;

FileEncodeTransfer.targetEncoding = targetEncoding;

changeEncoding(sourceFile, targetFile);

}

public static void main(String[] args){

try {

changeEncoding("D:/bb.html","D:/bbu.html");

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}