java读取文件并获得文件编码，转换为指定编码的工具类代码

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import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStreamWriter;public class Test {    public static int fileCount = 0;    public static String sourceFileRoot = "D:/workspace/test/src/com/zuidaima/"; // 将要转换文件所在的根目录    public static String sourceCharset = "gbk"; // 源文件编码    public static String targetCharset = "utf8"; // 目标文件编码    public static void main(String[] args) throws IOException {        File fileDir = new File(sourceFileRoot);        convert(fileDir);        System.out.println("Total Dealed : " + fileCount + "Files");    }    public static void convert(File file) throws IOException {        // 如果是文件则进行编码转换，写入覆盖原文件        if (file.isFile()) {            // 只处理.java结尾的代码文件            if (file.getPath().indexOf(".java") == -1) {                return;            }            InputStreamReader isr = new InputStreamReader(new FileInputStream(                    file), sourceCharset);            BufferedReader br = new BufferedReader(isr);            StringBuffer sb = new StringBuffer();            String line = null;            while ((line = br.readLine()) != null) {                // 注意写入换行符                sb.append(line + "\n");            }            br.close();            isr.close();            File targetFile = new File(file.getPath() + "." + targetCharset);            OutputStreamWriter osw = new OutputStreamWriter(                    new FileOutputStream(targetFile), targetCharset);            BufferedWriter bw = new BufferedWriter(osw);            // 以字符串的形式一次性写入            bw.write(sb.toString());            bw.close();            osw.close();            System.out.println("Deal:" + file.getPath());            fileCount++;        } else {            for (File subFile : file.listFiles()) {                convert(subFile);            }        }    }}
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