使用response对象响应生成非字符

自学JSP的九大内置对象的response,以下代码为响应生成PNGString path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%>

Zeb-D

18844人浏览 · 2016-03-25 16:44:49

Zeb-D · 2016-03-25 16:44:49 发布

自学JSP的九大内置对象的response,以下代码为响应生成PNG

<%@ page language="java" pageEncoding="UTF-8" contentType="image/png"%>

<%@ page import="java.awt.image.*,javax.imageio.*,java.io.*,java.awt.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>IMG</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
<% //创建BufferedImage
BufferedImage image = new BufferedImage(340,160,BufferedImage.TYPE_INT_RGB);
//获取image 对象Graphics
Graphics g = image.getGraphics();
//使用Graphics画图，图像出现在image对象
g.fillRect(0, 0, 400, 400);
//画红弧
g.setColor(new Color(255,0,0));
g.fillArc(20, 20, 100, 100, 30, 120);
//绿
g.setColor(new Color(0,255,0));
g.fillArc(20, 20, 100, 100, 150, 120);
//蓝
g.setColor(new Color(0,0,255));
g.fillArc(20, 20, 100, 100, 270, 120);

//写字
g.setColor(new Color(0,0,0));
g.setFont(new Font("Arial Black",Font.PLAIN,16));
//
g.drawString("Red: climb", 200, 60);
g.drawString("Green: Running", 200, 100);
g.drawString("Blue: Swimming", 200, 140);
g.dispose();

//将图像输出到页面
ImageIO.write(image, "PNG", response.getOutputStream());

%>
</body>
</html>

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