Question

我正在尝试阅读一些存储在txt文件中的书籍对象。当我运行它运行的代码但返回不正确的信息。

预期结果：预订isbn = 225346873945，价格= 12.99，yearPublished = 2015，title ='Finders Fee'

实际结果：预订isbn =⸹㔬⁹牐毕汩敤敤〬⁴〬⁴price，price = 9.770698273454668E199，yearPublished = 1633907817，title ='捥⁯映瑨攠煲汤❽਀䵂浔楳㴲㴲㴲㴲㈵㌴㜳㤴㤴㤴⁰物捥㴱㈮㤹Ⱐ祥慲'

txt文件中的信息是正确的，但是当它在控制台中显示时，它是不正确的。忽略无效的while循环，我该如何修复此代码？

    try {
        bookFile.seek(0);
        for (Book bookObj : bookList) {
            String tempBook = bookObj.toString();
            bookFile.writeBytes(tempBook);
            bookFile.writeBytes(System.getProperty("line.separator"));
        }
    } catch (IOException e) {
        System.out.println("Error writing to " + BOOK_LIST_FILE);
    } catch (Exception e) {
        System.out.println("Generic error" + e);
    }


try{
        Book tempBook = new Book();
        bookFile.seek(0);
        while (true) {
            readData(bookFile, tempBook);
            System.out.println(tempBook.toString());
        }
    } catch (IOException e){
        System.out.println("IO Error " + e);
    } catch (Exception e) {
        System.out.println("Error " + e.getMessage());
    }
}

public static void readData( RandomAccessFile bookFile, Book book) throws IOException, EOFException, Exception
{
    StringBuffer sb = new StringBuffer();

    for (int i=0; i<book.getISBN_LENGTH(); i++){
        sb.append(bookFile.readChar());
    }

    book.setIsbn(sb.toString());

    book.setPrice(bookFile.readDouble());

    book.setYearPublished(bookFile.readInt());

    sb.setLength(0);

    for (int i = 0; i <book.TITLE_LENGTH ; i++) {
        sb.append(bookFile.readChar());
    }

    book.setTitle(sb.toString());

}

Answer 1

readInt()和朋友们都是二进制数据。你的文件是文字。您应该只读取此文件中的字节。 RandomAccessFile是一个糟糕的选择：对BufferedReader而不是InputStreamReader和FileInputStream方法使用readLine()。

RandomAccessFile将int转换为中文

1 个答案: