InputStream.read（byte [] b）返回意外字节

Question

我正在使用bytesCount = InputStream.read(byteArray)从客户端读取数据：

我的服务器：

InputStream IS = Connection.getInputStream();
byte[] InData = new byte[1024];
int bytesCount = IS.read(InData);    

我的客户：

ObjectOutputStream OOS = null;
try {
    OOS = new ObjectOutputStream(connection.getOutputStream());
} catch (Exception e) {}
OutputStreamWriter OSW = new OutputStreamWriter(OOS);
try {           
    OSW.write("ABC");
    OSW.flush();
} catch (Exception e) {}    

如您所见，客户端发送字符串“ABC”，但服务器收到的字节数组为InData = [-84, -19, 0, 5, 119, 3, 65, 66, 67, 0, 0, 0, ...]和bytesCount = 9

前6个字节是什么？

Answer 1

它是ObjectOutputStreamHeader，请参阅writeStreamHeader()此处：http://developer.classpath.org/doc/java/io/ObjectOutputStream-source.html

如果要将字符串序列化为UTF8，只需使用带有UTF8编码的常规OutputStreamWriter（不是ObjectOutputStream）并写入字符串：

OutputStreamWriter ows = new OutputStreamWriter(connection.getOutputStream(), "UTF-8");
osw.write("ABC");