Orcale BLOB 乱码问题

我往orcale数据里存了一个"hhfs"，从文件里读出来的,但是取出来后却是乱码：
这个是存入的方法
    private void insertBlob(Connection conn){
        try{


            conn.setAutoCommit(false);

            Statement st = conn.createStatement();


            st.executeUpdate("insert into test1  values('hxc',empty_blob())");



            ResultSet rs = st.executeQuery(

                      "select * from  test1  where  name='hxc' for update");

            if (rs.next()) {

           


            oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob("xml");

             

            OutputStream outStream = blob.getBinaryOutputStream();

             

            File file = new File("c:\\ttt.txt");

            InputStream fin = new FileInputStream(file);
       

            byte[] b = new byte[blob.getBufferSize()];

                    int len = 0;

                    while ( (len = fin.read(b)) != -1) {

                      outStream.write(b, 0, len);

                      //blob.putBytes(1,b);

                    }
                    fin.close();
                    outStream.flush();
                    outStream.close();
                    conn.commit();
            }}catch(Exception e){
                e.printStackTrace();
            }
    }
取出方法：
            while(rs.next()){   
                BLOB blob = (BLOB)rs.getBlob("xml");               
                byte[] bb = blob.getBytes();
               
                FileOutputStream out = new FileOutputStream("c:\\t1.txt");
                out.write(bb);
                out.flush();
请大看帮我想想办法，，