JAVA 字符流读取和写入改进 ，用到读写便捷类

import java.io.*;

public class CopyJavaDemo {
    public static void main(String[] args) throws IOException {
        File file = new File("./src/CopyJavaDemo.java");
        if(file.isFile()){
            //字节流进行操作
            FileReader fr = new FileReader(file);
            String Path = "./Copy.java";
            FileWriter fw = new FileWriter(Path);
//            int ch;
//            while ((ch = isr.read()) !=-1){
//                osw.write(ch);
//            }
            char[] chs = new char[1024];
            int len;
            while ((len = fr.read(chs)) !=-1){
                fw.write(chs,0,len );
            }
            fr.close();
            fw.close();

        }else {
            System.out.println("文件不存在");
        }
    }
}