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在 Java 控制台上打印 .dat 的正确方法是什么?

public void open(){
    try {
        FileInputStream inFile =
            new FileInputStream("C:"+File.separatorChar+"transactions.dat");
        ObjectInputStream in = new ObjectInputStream(inFile);
        //While (in.readLine!=null){
            System.out.print(in.readLine());}
        in.close();
    } catch (FileNotFoundException ex) {
        System.out.println(ex);
    } catch (Exception ex) {
        ex.printStackTrace();
    } finally{  }
}

这仅给出单行的结果,字符具有不同的大小如何读取所有数据并打印到具有可读输出的控制台!

当我最初在这个 dat 文件中写入时,我使用

FileOutputStream outFile =
    new FileOutputStream("C:"+File.separatorChar+"transactions.dat");
ObjectOutputStream out = new ObjectOutputStream(outFile);
out.writeChars(brokerageAcc1.toString());
4

3 回答 3

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如果这是您正在编写和阅读的文本,那么您应该使用 Writer 和 Reader 类,用 BufferedWriter 和 BufferedReader 包装以提供行处理。

FileOutputStream outFile =
    new FileOutputStream("C:"+File.separatorChar+"transactions.dat");
BufferedWriter writer = new BufferedWriter(new Writer(outFile));
writer.write(Acc1.toString());
// maybe write a newline??
writer.newLine();

然后使用缓冲阅读器将其读回:

FileInputStream inFile =
    new FileInputStream("C:"+File.separatorChar+"transactions.dat");
BufferedReader reader = new BufferedReader(new InputStreamReader(inFile));
while (true) {
    String line = reader.readline();
    if (line == null) break;
    System.out.println(line);
}
于 2011-04-06T12:41:26.050 回答
0

如果控制台上的字符大小不同,则控制台本身被配置为使用比例字体显示文本。这必须在控制台上进行调整,并且不能从您的 java 应用程序中控制。

您正在写信给ObjectOutputStream. 这有点奇怪,但您可能对此有要求。要从这样的文件中读取,请使用以下代码(注意:我稍微更改了您的写作算法!不包括流关闭和异常处理)

// writing

FileOutputStream outFile = new FileOutputStream("C:"+File.separatorChar+"transactions.dat");
ObjectOutputStream out = new ObjectOutputStream(outFile);

String s = brokerageAcc1.toString();
out.writeInt(s.length());
System.out.println(s.length());

out.writeChars(s);

// reading

FileInputStream inFile = new FileInputStream("C:"+File.separatorChar+"transactions.dat");
ObjectInputStream in = new ObjectInputStream(inFile);
int length = in.readInt();     // get the number of chars
System.out.println(""+length);
StringBuilder result = new StringBuilder();
for (int i = 0; i < length; i++)
  result.append(in.readChar());
System.out.println(result.toString());
于 2011-04-06T12:49:29.633 回答
0
FileInputStream fis = new FileInputStream("C:"+File.separatorChar+"transactions.dat");
BufferedReader br=new BufferedReader(new InputStreamReader(fis));
String s;
while ((s=br.readline())!=null)
    System.out.println(s);
于 2011-04-06T12:38:33.240 回答