在Java控制台上打印.dat的正确方法是什么？

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{  }
}

这只给出单行的结果，字符大小不同 如何读取所有数据并以可读输出打印到控制台上

当我在这个dat文件中进行原始写入时，我使用

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

---

如果这是您正在编写和读取的文本，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();

然后使用缓冲读取器将其读回：

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);
}

---

如果控制台上的字符大小不同，则控制台本身配置为以比例字体显示文本。这必须在控制台上进行调整，不能从java应用程序进行控制

您正在写入ObjectOutputStream。这有点奇怪，但您可能对此有要求。要读取这样的文件，请使用以下代码注释：我稍微更改了您的编写算法！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());

---

阅读java.io中关于读写器的更多信息，它可以帮助您处理字符串输入和输出结果。appendin.readChar；此行给出java.io.DataInputStream.readCharUnknown源处java.io.ObjectInputStream$BlockDataInputStream.readCharUnknown源处java.io.EOFEException异常java.io.ObjectInputStream.readCharUnknownSource@Jenifer-你改变了写作部分了吗？我又添加了两行调试代码，请检查，这两行打印的值是否相同。EOF不应该发生。@Jenifer-又做了一个更改-有可能brokerageAcc1.toString在读取长度和字符串之间发生更改。将其存储到变量中。

// 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());