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将JSP在内存生成的图片显示到页面

 2004-06-29 16:29:53 来源:WEB开发网   
核心提示:Imaging_ToWeb.jsp<%@ page autoFlush="false" import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%><% Strin

Imaging_ToWeb.jsp

<%@ page autoFlush="false"  import="java.awt.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%>
<%
   String ImageStr = request.getParameter("ID_Text");
   if(ImageStr==null || ImageStr.equals(""))
   {
     response.setContentType("text/html; charset=gb2312");
 %>
<HTML>
 <HEAD>
  <title>Http://www.lionsky.net</title>
  <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
 </HEAD>
 <body>
  <form id="Form1" method="post">
   <input type="text" id="ID_Text" name=ID_Text>
   <input type=submit value="GO">
  </form>
 </body>
</HTML>

<%
    }
    else
    {
     out.clear();
     response.setContentType("image/jpeg");
     response.addHeader("PRagma","NO-cache");
     response.addHeader("Cache-Control","no-cache");
     response.addDateHeader("Expries",0);
     int width=300, height=100;
     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
     Graphics g = image.getGraphics();
     //以下填充背景颜色
     g.setColor(Color.lightGray);
     g.fillRect(0, 0, width, height);
     String random="random";
     //以下设置前景色
     g.setColor(Color.BLACK);
     g.drawString("Http://www.cncms.com",10,20);
     g.drawString("Author:Lion[lion-a@sohu.com]",10,40);
     g.drawLine(10,50,290,50);
     g.drawString(ImageStr,10,70);
     g.dispose();
     ServletOutputStream outStream = response.getOutputStream();
     JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(outStream);
     encoder.encode(image);
     outStream.close();
   }

%>

Tags:JSP 内存 生成

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