JVM_Close在关闭PrintStream时返回-1



我对Java不是特别精通。

我将一个字节数组转换为字符串(每个字节都有一个十进制表示),然后写入一个文件。下面是一个最小的例子,它再现了我遇到的问题(我已经把文件命名的东西放在里面了,以防它相关):

public class PacketWriter {
    public static void writeBytes(byte[] in) {
        Calendar cal = Calendar.getInstance();
        cal.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("ddmmyyHHmmss");
        PrintStream out = null;
        File outFile = null;
        try {
            outFile = new File("recpacket"+sdf.format(cal.getTime())+".txt");
            outFile.createNewFile();   // also checks for existence of file alre    ady
            out = new PrintStream(new FileOutputStream(outFile,false));
            System.out.println(Arrays.toString(in));
            out.print(Arrays.toString(in));
            out.flush();
            System.out.println("Did the writing!");
        } catch (FileNotFoundException e) {
                System.err.println("Packet output file not found.");
        } catch (IOException e) {
            System.err.println("Could not write packets (I/O error).");
        }
        finally {                   
            System.out.println("Closing...");
            if (out != null) out.close();
            System.out.println("Closed.");
        }
    }
}

当我呼叫PacketWriter.writeBytes(/* some nonempty byte array */)时我得到以下输出:

... array ...
Did the writing!
Closing...
JVM_Close returned -1
Closed.

写入stdout。

该文件在返回时为空,并且不包含我希望它包含的字符串。

怎么了?

PrintStream类的错误报告非常糟糕:看起来写入文件失败了,但不可能知道原因;例如,这可能是因为文件系统中没有剩余空间。尝试使用FileWriter

    Writer out = null;
        out = new FileWriter(outFile,false);
        System.out.println(Arrays.toString(in));
        out.write(Arrays.toString(in));
        out.flush();

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