我对Java不是特别精通。
我正在将一个字节数组转换为一个字符串(每个字节都有一个十进制表示),然后写入一个文件。这是一个重现我遇到的问题的最小示例(我已将文件命名内容留在其中,以防万一它相关):
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.");
}
}
}
当我打电话时,PacketWriter.writeBytes(/* some nonempty byte array */)
我得到以下输出:
... array ...
Did the writing!
Closing...
JVM_Close returned -1
Closed.
写入标准输出。
该文件在返回时为空,并且不包含我想要的字符串。
怎么了?