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help!解决思路

热度:10   发布时间:2016-04-17 16:39:09.0
help!!!!
<%@   page   contentType= "text/html;   charset=gb2312 "   language= "java "   import= "java.sql.* "   errorPage= " "   %>
<%@   page   import= "java.awt.* "   %>
<%@   page   import= "java.io.* "   %>
<%@   page   import= "java.awt.image.* "   %>
<%@   page   import= "java.awt.geom.* "   %>
<%@   page   import= "com.sun.image.codec.jpeg.* "   %>

<!DOCTYPE   HTML   PUBLIC   "-//W3C//DTD   HTML   4.01   Transitional//EN "   "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;   charset=gb2312 ">
<title> 无标题文档 </title>
</head>

<body>
<br> 观看旋转的椭圆
<form   action= " "   method= "post "   name= "form ">
    <input   type= "submit "   value= "观看 "   name= "Submit "   >
</form>
<%
    String   str=request.getParameter( "submit ");
    if(str!=null)
    {
        response.setContentType( "image/jpeg ");
int   width=260,   height=260;
BufferedImage   image   =   new   BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics   g   =   image.getGraphics();
g.setColor(Color.white);
g.fillRect(0,   0,   width,   height);
Graphics2D   g_2d=(Graphics2D)g;
Ellipse2D   ellipse=new   Ellipse2D.   Double   (20,50,120,50);
g_2d.setColor(Color.blue);
AffineTransform   trans=new   AffineTransform();
    for(int   i=1;i <=24;i++)
        {
    trans.rotate(15.0*Math.PI/180,75,75);
    g_2d.setTransform(trans);
    g_2d.draw(ellipse);
}
    g.dispose();
    OutputStream   outClient=   response.getOutputStream();
    JPEGImageEncoder   encoder=JPEGCodec.createJPEGEncoder(outClient);
    encoder.encode(image);
    }
    %>
</body>
</html>
    原封不动的抄的 为什么看不到旋转的椭圆

------解决方案--------------------
<input type= "submit " value= "观看 " name= "Submit " >
Submit你是大写的

String str=request.getParameter( "submit ");
这里你是小写的。

改一下就行了
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