java把字符串存入blob字段

java.sql.Blob blob = rs.getBlob(2);  
InputStream in=blob.getBinaryStream();  
public static String getBlob(InputStream in) throws IOException {  
  
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();  
        byte[] data = new byte[4096];  
        int count = -1;  
        while ((count = in.read(data, 0, 4096)) != -1)  
            outStream.write(data, 0, count);  
  
        data = null;  
        String result = new String(outStream.toByteArray(), "gb2312");  
        return result;  
    }