前几天因项目需要，在网上找了些转格式工具，转换出来会出现中文乱码，于是写了一个小程序来转换。 因为本项目中只会出现ANSI和UTF8编码，于是只需要判断是否为UTF8。 判断编码格式部分出自: http://blog.163.com/wf_shunqiziran/blog/static/176307209201258102217810/
package test; import java.io.BufferedInputStream; 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; import java.io.PrintWriter; public class AnsiToUtf8 { /** * 读写文件方式改变文件编码格式 * @param path * @throws IOException */ public static void ansiToUTF8(String path) throws IOException{ BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path), "GB2312")); String all = ""; String line = null; while((line = br.readLine()) != null){ all += line + "\r\n"; } br.close(); PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(path), "UTF-8"))); out.write(all); out.flush(); out.close(); } /** * 判断文件编码格式是否为UTF8 * @param path * @return * @throws IOException */ public static boolean isUTF8(String path) throws IOException{ BufferedInputStream bis = new BufferedInputStream(new FileInputStream(path)); byte[] b = new byte[3]; bis.mark(0); bis.read(b, 0, 3); if(b[0] == (byte)0xEF && b[1] == (byte)0xBB && b[2] == (byte)0xBF){ bis.close(); return true; } bis.reset(); int read; while((read = bis.read()) != -1){ if (read >= 0xF0) break; if (0x80 <= read && read <= 0xBF) // 单独出现BF以下的，也算是GBK break; if (0xC0 <= read && read <= 0xDF) { read = bis.read(); if (0x80 <= read && read <= 0xBF) // 双字节 (0xC0 - 0xDF) continue; else break; } else if (0xE0 <= read && read <= 0xEF) {// 也有可能出错，但是几率较小 read = bis.read(); if (0x80 <= read && read <= 0xBF) { read = bis.read(); if (0x80 <= read && read <= 0xBF) { bis.close(); return true; } else break; } else break; } } bis.close(); return false; } /** * 遍历文件夹下所有文件 * @param dir * @throws IOException */ public static void traverseFolder(File dir) throws IOException{ File[] files = dir.listFiles(); for (File file : files) { // System.out.println(file.getName()); if(file.isDirectory()){ traverseFolder(file); } else if(file.getName().endsWith(".java") && !isUTF8(file.getAbsolutePath())){ ansiToUTF8(file.getAbsolutePath()); } } } public static void main(String[] args){ File dir = new File("d:\\test"); try { traverseFolder(dir); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }