Java使用字符流拷贝文件出现乱码

1. Java代码

2. //BufferedReader in = null;//BufferedWriter out = null;Reader in = null;Writer out = null;try {//in = new BufferedReader(new FileReader(src));//in = new BufferedReader(new InputStreamReader(new FileInputStream(src)));//out = new BufferedWriter(new FileWriter(new File(dir, src.getName())));//out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(dir, src.getName()))));in = new FileReader(src);out = new FileWriter(new File(dir, src.getName()));System.out.println("正在拷贝文件(" + src + ")到目录("+dir+")下");char[] buffer = new char[1024];int len = 0;while((len = in.read(buffer)) != -1) {out.write(buffer, 0, len);out.flush();}return true;} catch (Exception e) {return false;} finally {closeIO(in, out);}

   
   
   
3. 乱码情况
5. 怎样解决？

我想知道这种情况是怎么造成的？又该怎样解决？