Java Blackberry Api：将字节数组写入文件

我正在尝试在mp3文件中读取和写入元数据。我能读数据，但我不知道怎么写

我使用以下代码获取文件访问权限：

FileConnection file = (FileConnection) Connector.open("file:///store/home/user/music/song.mp3");
if(file.exists())
         java.io.InputStream inputStream = file.openInputStream();

稍后，我使用以下代码读取数据：

buffer = new byte[length]; // length is predetermined earlier
if (inputStream.read(buffer, 0, length) == length)
         String info = new String((buffer));

    FileConnection fconn = null;
    OutputStream out = null;
    try {
        fconn = (FileConnection) Connector.open(yourFileNameAndPath,Connector.READ_WRITE);
    }
    fconn.create();
    out = fconn.openOutputStream();
    out.write(yourDataBytes);
    out.flush();
    fconn.close();

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如何将数据（字节）写入文件中的指定位置？我不确定IO声明和输出字节所需的特定代码。

要在Blackberry上写入文件，请使用以下代码：

buffer = new byte[length]; // length is predetermined earlier
if (inputStream.read(buffer, 0, length) == length)
         String info = new String((buffer));

    FileConnection fconn = null;
    OutputStream out = null;
    try {
        fconn = (FileConnection) Connector.open(yourFileNameAndPath,Connector.READ_WRITE);
    }
    fconn.create();
    out = fconn.openOutputStream();
    out.write(yourDataBytes);
    out.flush();
    fconn.close();