java io流练习 写入 输入数据

String file_path = "D:\\can\\he.txt";
String file_directory = "D:\\can";
File file_create = new File(file_path);
File file_createdirectory = new File(file_directory);
FileOutputStream read_file = null;
if (file_create != null && !file_create.isFile()){
    try {
        file_create.createNewFile();
    }catch (Exception e) {
        e.printStackTrace();
    }

    try {
        read_file = new FileOutputStream(file_path,true);
        read_file.write(new String("hello wolrd").getBytes());
        read_file.write(new String("hello wolrd").getBytes());
        read_file.write(new String("hello wolrd").getBytes());
        read_file.write(new String("hello wolrd").getBytes());
        read_file.write(new String("hello wolrd").getBytes());

    }catch (IOException e){
        e.printStackTrace();
    } finally{
        try {
            read_file.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    byte[] read_buffered = new byte[2000];
    FileInputStream read_file_memory  = null;
    int len = 0;
    try{
        read_file_memory = new FileInputStream(file_path);
        while((len = read_file_memory.read(read_buffered)) != -1){
            System.out.println(new String(read_buffered,0,read_buffered.length));
        }
    }catch(Exception e){
        e.printStackTrace();
    } finally{
        try{
            read_file_memory.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }


}