JDBC读取Oracle LONG RAW类型字段

今天在项目中要向Oracle的LONG RAW形字段插入图片，以配合C/S的设计结构
项目中用Hibernate ORM，找了N久没有找到具体操作方法，终于花了2个多小时找到一个JDBC操作的例子,代码改造后为
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class JdbcImgDAO {
    //数据库连接方法
public static Connection getConnection(){
String  url="jdbc:oracle:thin:@192.168.0.100:1521:testdb";  
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");   
conn=DriverManager.getConnection(url,"user","pwd");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}    
return conn;
}

    //插入图片到案例库，id为主键,s为上传图片(路径+图片名)
public static void updateImg(String id, String s){
Connection conn = getConnection();
String  sql="update table t set t.img=? where id=?";  
File  filename=new  File(s);
        //将文件的长度读出，并转换成Long型   
long  l1=filename.length(); 
int  l2=(int)l1; 
try {
            //以流的格式赋值
FileInputStream  fis=new  FileInputStream(filename); 
PreparedStatement  ps  =conn.prepareStatement(sql);   
ps.setBinaryStream(1,fis,l2);
            //ps.setBinaryStream(1,fis,fis.available());
ps.setString(2,id);  
ps.executeUpdate();     
ps.close(); 
fis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}



显示图片页
img.jsp

<%@ page contentType="text ml; charset=gbk"%>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*, javax.sql.*"%>
<%@ page import="java.util.*"%>
<%
String id = request.getParameter("id");
String URL="jdbc:oracle:thin:@192.168.0.100:1521:testdb";
String user="user";
String password="pwd";
Connection con = DriverManager.getConnection(URL,user,password);
InputStream in = null;
ResultSet rs = null;
OutputStream out = response.getOutputStream();
try{
Statement stmt = con.createStatement();
String sql = "select t.img from table t where id="+id;
rs = stmt.executeQuery(sql);
while(rs.next()) {
in = rs.getBinaryStream("img");
int len = 0;
byte[] byte = new byte[1024];
//response.setContentType("image/jpeg");
while ((len = in.read(byte)) != -1) {
  out.write(byte,0,len);
  }
  out.close();
   in.close();
   }
}catch(Exception e){
   e.printStackTrace();
  }finally{
   rs.close();
   con.close();
}
%>
显示信息页面
<img src="img.jsp">