【DemoFileOutputStream- 使用FileOutputStream写入指定内容到指定文件】

使用FileOutputStream写入指定内容到指定文件

/**
 * @author 南风知我意唔
 * @version 1.0
 * 使用FileOutputStream写入指定内容到指定文件
 */
public class DemoFileOutputStream {
    public static void main(String[] args) {
        
        while (true){
            Scanner input=new Scanner(System.in);
            //指定文件地址
            System.out.print("FilePath:");
            String filePath=input.nextLine();
            //内容
            System.out.print("Content:");
            String message=input.nextLine();
            boolean b = false;
            try{
                b=writeToLocalFile(message, filePath, true);
            }catch (Exception e){
                System.out.println(e.getMessage());
            }
            if (b){
                System.out.println("success！");
            }else{
                System.out.println("fail!");
            }
            System.out.print("是否继续(y)添加:");
            String y=input.nextLine();
            if (!y.equals("y")){
                System.out.println("系统退出....");
                break;
            }
        }
    }

    public static boolean writeToLocalFile(String message,String filePath,boolean b){
        File file=new File(filePath);
        System.out.println(file);
        System.out.println(filePath);
        if (message==null){
            throw new MessageIsNull("写入信息为null");
        }
        if (!file.exists()){
            throw new FileException("路径不存在:"+filePath);
        }
        if (!file.isFile()){
            throw new FileException("Not is File:"+filePath);
        }
        FileOutputStream fileOutputStream=null;
        try {
           fileOutputStream=new FileOutputStream(file,b);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        byte[] messages = message.getBytes();
        try {
            fileOutputStream.write(messages);
            fileOutputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }finally {
            if (fileOutputStream!=null){
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return true;
    }
}
class FileException extends RuntimeException{
    public FileException(String message) {
        super(message);
    }
}
class MessageIsNull extends RuntimeException{
    public MessageIsNull(String message) {
        super(message);
    }
}