在Carousel项目中显示图像

时间:2014-12-08 11:00:27

标签: java blob carousel oracle-adf binarystream

我正在使用ADF并需要在Carousel中显示图像。在servlet中编写了以下代码,但在页面加载时,它分配值" weblogic.jdbc.wrapper.Blob_oracle_sql_BLOB@xxx 如果数据库中存在针对该特定记录提取的图像,则#blo; (xxx - 某些字母数字值)到blob对象

链接引用 - http://www.baigzeeshan.com/2010/10/display-images-in-carousel-item-in.html

public void doGet(HttpServletRequest request,
                  HttpServletResponse response) throws ServletException,
                                                       IOException {
    response.setContentType(CONTENT_TYPE);
    String imageId = request.getParameter("id");
    OutputStream os = response.getOutputStream();
    Connection conn = null;
    try {
        Context ctx = new InitialContext();
        //Datasource as defined in <res-ref-name> element of weblogic.xml
        DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/HrXEDS");
        conn = ds.getConnection();
        PreparedStatement statement =
            conn.prepareStatement("SELECT image_id, image_blob " +
                                  "FROM hr_image_table " +
                                  "WHERE image_id = ?");
        statement.setInt(1, new Integer(imageId));
        ResultSet rs = statement.executeQuery();
        if (rs.next()) {
            Blob blob = rs.getBlob("IMAGE_BLOB");
            System.out.println("-- blob --" + blob);
            BufferedInputStream in =
                new BufferedInputStream(blob.getBinaryStream());
            int b;
            byte[] buffer = new byte[10240];
            while ((b = in.read(buffer, 0, 10240)) != -1) {
                os.write(buffer, 0, b);
            }
            os.close();
        }
    } catch (Exception e) {
        System.out.println(e);
    } finally {
        try {
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException sqle) {
            System.out.println("SQLException error");
        }
    }
}

1 个答案:

答案 0 :(得分:0)

如果您使用数据源并且Weblogic Server中的配置正在包装数据类型,则可能会出现问题。

在浏览器中打开Weblogic Server管理控制台(服务器:端口/控制台)

转到服务 - &gt;数据来源 - &gt; YourDataSource - &gt;连线投票 - &gt;先进

取消选中属性Wrap Data Types。

希望它有所帮助...