JSP读取Oracle数据库里的图片Blob字段并显示在页面上

The original website:http://longdick.iteye.com/blog/315279

 

/**

*  转载请注明作者longdick    http://longdick.iteye.com

*

*/

 

首先定义一个读取Oracle数据库的Blob字段并把字节写入一个输出流的方法：

 

 

public static void writeImg(OutputStream os) {
        Connection con;
        try {
            con = ConnectionFactory.getConnection();
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery("select pic from blob_table where b_id=1");
            byte[] b = new byte[1024];
            if (rs.next()) {
                Blob blob = rs.getBlob(1);
                InputStream is = blob.getBinaryStream();
                int i = 0;
                while ((i = is.read(b)) != -1) {
                    os.write(b, 0, i);
                }
                os.close();
                is.close();
            }
            rs.close();
            stmt.close();
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

public static void writeImg(OutputStream os) {
		Connection con;
		try {
			con = ConnectionFactory.getConnection();
			Statement stmt = con.createStatement();
			ResultSet rs = stmt.executeQuery("select pic from blob_table where b_id=1");
			byte[] b = new byte[1024];
			if (rs.next()) {
				Blob blob = rs.getBlob(1);
				InputStream is = blob.getBinaryStream();
				int i = 0;
				while ((i = is.read(b)) != -1) {
					os.write(b, 0, i);
				}
				os.close();
				is.close();
			}
			rs.close();
			stmt.close();
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

 

然后做一个servlet，在doGet方法里调用writeImg方法

 

public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        DBOperator.writeImg(response.getOutputStream());

    }

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		DBOperator.writeImg(response.getOutputStream());
		
	}

 

 

最后只需要在显示的jsp页面里面定义img标签的src属性为servlet的访问地址就可以了：

 

<img src="servlet/newServlet"  >