java如何里将文件存到数据库中

public class InsertBlobData {
Connection con = null;
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
InsertBlobData data = new InsertBlobData();
data.insertBlogInfo("002jpg", "sdsdfdf", "2007-02-12", "002.jpg");
}
public void insertBlogInfo(String jmzh, String xm, String smsj,
String fileName) throws Exception {
// try {
con = ConnectionPoliceFactory.getFactory().getConnection();
// } catch (ClassNotFoundException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
// 处理事务
boolean defaultCommit = con.getAutoCommit();
con.setAutoCommit(false);
Statement st = con.createStatement();
// 插入一个空对象
st.executeUpdate("insert into ksren_txxx(jmzh,xm,smsj,txsj) values('"
+ jmzh + "','" + xm + "',to_date('" + smsj
+ "','yyyy-mm-dd'),empty_blob())");
// 用for update方式锁定数据行
ResultSet rs = st
.executeQuery("select txsj from ksren_txxx where jmzh='"
+ jmzh + "' and xm='" + xm + "' for update");
if (rs.next()) {
// 得到java.sql.Blob对象，然后Cast为oracle.sql.BLOB
oracle.sql.BLOB blob = (oracle.sql.BLOB) rs.getBlob(1);
// 到数据库的输出流
OutputStream outStream = blob.getBinaryOutputStream();
// 这里用一个文件模拟输入流
InputStream fin = new FileInputStream(new File(fileName));
// 将输入流写到输出流
byte[] b = new byte[blob.getBufferSize()];
int len = 0;
while ((len = fin.read(b)) != -1) {
outStream.write(b, 0, len);
// blob.putBytes(1,b);
}
// 依次关闭（注意顺序）
fin.close();
outStream.flush();
outStream.close();
con.commit();
/* 恢复原提交状态 */
con.setAutoCommit(defaultCommit);
con.close();
}
}
}