public static void main(String[] args) {
        String path1="F:/1.txt";
        String path2="F:/2.txt";
        FileWriter fw=null;
        FileReader fr=null;
        try {
            fw=new FileWriter(path2);
            fr=new FileReader(path1);
            //方式一：按字节写入
            /*int temp=0;
            while((temp=fr.read())!=-1) {
                fw.write(temp);
            }
            */
            //方式二：按字符数组写入
            char[] data=new char[1024];
            int temp2=0;
            while((temp2=fr.read(data))!=-1) {
                fw.write(new String(data,0,temp2));
            }
            fw.flush();
            
        } catch (Exception e) {
            // TODO: handle exception
        }
        
    }