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1、用JSP从数据库中读取图片并显示在网页上用JSP从数据库中读取图片并显示在网页上 环境mysql+tomcat: <1>先在mysql下建立如下的table. 并insert图像. mysql.sql文件如下: CREATE TABLE photo ( photo_no int(6) unsigned NOT NULL auto_increment, image blob, PRIMARY KEY (photo_no) ) <2>把show.jsp放在tomcat的任意目录下. show.jsp作用:从数据库中读出blob,并产生image/jpg. show.jsp文件如下:
2、 <% page contentType=text/html; charset=gbk %> <% page import=java.io.*%> <% page import=java.sql.*, javax.sql.* %> <% page import=java.util.*%> <% page import=java.math.*%> <% String photo_no = request.getParameter(photo_no); /mysql连接 Class.forName(com.mysql.jdbc.Driver).newIn
3、stance; String URL=jdbc:mysql:/localhost:3306/job?user=root&password=111111; Connection con = DriverManager.getConnection(URL); /oracle连接 /String URL=jdbc:oracle:thinlocalhost:1521:orcl2; /user=system; /password=manager; /Connection con = DriverManager.getConnection(URL,user,password); try / 准备语句执行对
4、象 Statement stmt = con.createStatement; String sql = SELECT * FROM PHOTO WHERE photo_no = + photo_no; ResultSet rs = stmt.executeQuery(sql); if (rs.next) Blob b = rs.getBlob(photo_image); long size = b.length; /out.print(size); byte bs = b.getBytes(1, (int)size); response.setContentType(image/jpeg);
5、 OutputStream outs = response.getOutputStream; outs.write(bs); outs.flush; rs.close; else rs.close; response.sendRedirect(./images/error.gif); finally con.close; %> <3>把如下文件放在show.jsp的同一目录下. index.html文件如下: <HTML> <HEAD> <TITLE> 图像测试 </TITLE> </HEAD> <BODY> <TABLE> <TR> <TD>图像测试</TD> </TR> <TR> <TD><img src=show.jsp?photo_no=2></TD> </TR> </TABLE> </BODY> </HTML>
