使用java进行文件编码转换

在开发过程中，可能会遇到文件编码的转换，虽然说开发工具eclipse可以转换编码，但是有的情况却很不方便。比如，原来文件本身的编码是GBK，现在要转换成UTF-8，如果直接在eclipse中把文件编码修改成UTF-8，恭喜你，是乱码，因为不能直接从GBK到UTF-8进行转换，这时就需要我们手动的来转换编码。下面是一个文件编码转换的工具类。

package com.mikan.stuff;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FilenameFilter;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.nio.charset.Charset;import java.nio.charset.UnsupportedCharsetException;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;/**   * @Description 文件编码转换 * @author huangzhongjie * @mail [e-mail] * @date 2015-5-2 */public class FileCharsetConverter {private static final Log _log = LogFactory.getLog(FileCharsetConverter.class);public static void main(String[] args) throws Exception {convert("E:\\MyEclipse\\2015003\\mavenssh","GBK", "UTF-8",null);//convert("E:\\MyEclipse\\2015003\\mavenssh","UTF-8", "GBK",null);}/** * 把指定文件或目录转换成指定的编码 *  * @param fileName *            要转换的文件 * @param fromCharsetName *            源文件的编码 * @param toCharsetName *            要转换的编码 * @throws Exception */public static void convert(String fileName, String fromCharsetName,String toCharsetName) throws Exception {convert(new File(fileName), fromCharsetName, toCharsetName, null);}/** * 把指定文件或目录转换成指定的编码 *  * @param file *            要转换的文件或目录 * @param fromCharsetName *            源文件的编码 * @param toCharsetName *            要转换的编码 * @throws Exception */public static void convert(File file, String fromCharsetName,String toCharsetName) throws Exception {convert(file, fromCharsetName, toCharsetName, null);}/** * 把指定文件或目录转换成指定的编码 *  * @param file *            要转换的文件或目录 * @param fromCharsetName *            源文件的编码 * @param toCharsetName *            要转换的编码 * @param filter *            文件名过滤器 * @throws Exception */public static void convert(String fileName, String fromCharsetName,String toCharsetName, FilenameFilter filter) throws Exception {convert(new File(fileName), fromCharsetName, toCharsetName, filter);}/** * 把指定文件或目录转换成指定的编码 *  * @param file *            要转换的文件或目录 * @param fromCharsetName *            源文件的编码 * @param toCharsetName *            要转换的编码 * @param filter *            文件名过滤器 * @throws Exception */public static void convert(File file, String fromCharsetName,String toCharsetName, FilenameFilter filter) throws Exception {if (file.isDirectory()) {File[] fileList = null;if (filter == null) {fileList = file.listFiles();} else {fileList = file.listFiles(filter);}for (File f : fileList) {convert(f, fromCharsetName, toCharsetName, filter);}} else {if (filter == null|| filter.accept(file.getParentFile(), file.getName())) {String fileContent = getFileContentFromCharset(file,fromCharsetName);saveFile2Charset(file, toCharsetName, fileContent);}}}/** * 以指定编码方式读取文件，返回文件内容 * * @param file *            要转换的文件 * @param fromCharsetName *            源文件的编码 * @return * @throws Exception */public static String getFileContentFromCharset(File file,String fromCharsetName) throws Exception {if (!Charset.isSupported(fromCharsetName)) {throw new UnsupportedCharsetException(fromCharsetName);}InputStream inputStream = new FileInputStream(file);InputStreamReader reader = new InputStreamReader(inputStream,fromCharsetName);char[] chs = new char[(int) file.length()];reader.read(chs);String str = new String(chs).trim();reader.close();return str;}/** * 以指定编码方式写文本文件，存在会覆盖 *  * @param file *            要写入的文件 * @param toCharsetName *            要转换的编码 * @param content *            文件内容 * @throws Exception */public static void saveFile2Charset(File file, String toCharsetName,String content) throws Exception {if (!Charset.isSupported(toCharsetName)) {throw new UnsupportedCharsetException(toCharsetName);}OutputStream outputStream = new FileOutputStream(file);OutputStreamWriter outWrite = new OutputStreamWriter(outputStream,toCharsetName);outWrite.write(content);outWrite.close();_log.info("File: ["+file.getName()+"] has been converted.");}}