IO 输入输出 Reader

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

public class FileReaderDemo {
    public static void main(String[] args) {
        File file = new File("f:\\test");
        if (!file.exists()) {
            file.mkdirs();
        }
        String r = file.getAbsolutePath() + "\\1.txt";
        String w = file.getAbsolutePath() + "\\2.txt";
        FileWriter fw = null;
        FileReader fr = null;
        try {
            fr = new FileReader(r);
            fw = new FileWriter(w);
            int len = 0;
            while ((len = fr.read()) !=-1) {
                fw.write(len);
            }
//            fw.write("abc");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                fr.close();
                fw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}