1 public class ChangeFileEncoding {
 2     public static int fileCount = 0;
 3     public static String sourceFileRoot = "替换为要转换的源文件或源目录"; // 将要转换文件所在的根目录
 4     public static String sourceCharset = "GB2312"; // 源文件编码
 5     public static String targetCharset = "utf8"; // 目标文件编码
 6     public static void main(String[] args) throws IOException {
 7         File fileDir = new File(sourceFileRoot);
 8         convert(fileDir);
 9         System.out.println("Total Dealed : " + fileCount + "Files");
10     }
11
12     public static void convert(File file) throws IOException {
13         // 如果是文件则进行编码转换，写入覆盖原文件
14         if (file.isFile()) {
15             // 只处理.java结尾的代码文件
16             if (file.getPath().indexOf(".java") == -1) {
17                 return;
18             }
19             InputStreamReader isr = new InputStreamReader(new FileInputStream(
20                     file), sourceCharset);
21             BufferedReader br = new BufferedReader(isr);
22             StringBuffer sb = new StringBuffer();
23             String line = null;
24             while ((line = br.readLine()) != null) {
25                 // 注意写入换行符
26                 line =  URLEncoder.encode(line, "utf8");
27                 sb.append(line + "\r\n");//windows 平台下 换行符为 \r\n
28             }
29             br.close();
30             isr.close();
31
32             File targetFile = new File(file.getPath());
33             OutputStreamWriter osw = new OutputStreamWriter(
34                     new FileOutputStream(targetFile), targetCharset);
35             BufferedWriter bw = new BufferedWriter(osw);
36             // 以字符串的形式一次性写入
37             bw.write(URLDecoder.decode(sb.toString(), "utf8"));
38             bw.close();
39             osw.close();
40
41             System.out.println("Deal:" + file.getPath());
42             fileCount++;
43         } else {
44             //利用递归对目录下的每个以.java结尾的文件进行编码转换
45             for (File subFile : file.listFiles()) {
46                 convert(subFile);
47             }
48         }
49     }
50
51 }