import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
 
public class CharsetConvertor { 
 
    public static void main(String[] args) { 
        String directory = "src"; 
        String suffix = ".java"; 
        String fromEncoding = "gb2312"; 
        String toEncoding = "utf-8"; 
        change(directory, suffix, fromEncoding, toEncoding); 
 
    } 
 
    /** 
     * ��拷锟界�锟斤拷瑜帮拷irectory��拷锟斤拷锟斤拷锟斤拷锟介�锟斤拷锟斤拷锟界�锟斤拷缂�拷锟芥�锟�ffix锟斤拷锟芥�璁癸拷缂�拷锟芥�锟斤拷锟斤拷锟藉�锟借�fromEncoding锟藉�锟芥�锟�Encoding 
     */ 
    public static void change(String directory, String suffix, String fromEncoding, String toEncoding) { 
        File dir = new File(directory); 
        if (dir.isAbsolute() || dir.isDirectory()) { 
            File[] list = dir.listFiles(); 
            for (int i = 0; i < list.length; i++) { 
                File file = list[i]; 
                if (file.isFile() && file.getName().toLowerCase().endsWith(suffix)) { 
                    System.out.println(file.getPath()); 
                    try { 
                        InputStream in = new FileInputStream(file); 
                        BufferedReader br = new BufferedReader(new InputStreamReader(in, fromEncoding)); 
                        File temp = new File(file.getPath() + ".txt"); 
                        OutputStream out = new FileOutputStream(temp); 
                        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(out, toEncoding)); 
                        String line = null; 
                        while ((line = br.readLine()) != null) { 
                            bw.write(line+"\r\n"); 
                        } 
                        br.close(); 
                        in.close(); 
                        bw.close(); 
                        out.close(); 
                        file.delete(); 
                        temp.renameTo(file); 
 
                    } catch (Exception e) { 
                        // TODO Auto-generated catch block 
                        e.printStackTrace(); 
                    } 
 
                } else if (file.isDirectory()) { 
                    change(file.getPath(), suffix, fromEncoding, toEncoding); 
                } 
            } 
 
        } 
    } 
 
}