JSP Oracle BLOB 图片读取

来源：互联网发布：网络安全技术有哪些编辑：程序博客网时间：2024/06/04 19:13
<%@ page contentType="text/html;charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<h2>显示图片：</h2>
<%@ page import="java.io.*"%> 
<%
    try
    {
        Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
        String url="jdbc:oracle:thin:@localhost:1521:ORCL";   
        Connection con=DriverManager.getConnection(url,"system","oracle"); 
        con.setAutoCommit (false);
        Statement   stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); 
        ResultSet rs=stmt.executeQuery("select id,txt,imag from hr.psn where id=(select max(id) from hr.psn)");// 
        
        if(rs.next())
        {
            int len = 10 * 1024 * 1024;
            InputStream in = (InputStream)rs.getBinaryStream("imag");//①  
            response.reset(); //返回在流中被标记过的位置  
            response.setContentType("image/jpg"); //或gif等 //得到输入流  
            OutputStream toClient = response.getOutputStream();//②  
            byte[] P_Buf = new byte[len]; 
            int i=-1; 
            while ((i = in.read(P_Buf)) != -1)
            {
             toClient.write(P_Buf, 0, i);
            } 
            in.close(); 
            toClient.flush(); //强制清出缓冲区  
            toClient.close();//  
            con.commit();
        }
        
        rs.close(); 
        stmt.close();
        con.close();    
    }
    catch(Exception   ex)
    {     
        ex.printStackTrace(); 
    }
%>
</body>
</html>