本文共 1456 字，大约阅读时间需要 4 分钟。

加入以下代码中，红色并加了下划线的一句代码就可以正常显示了。

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,javax.imageio.*" %><%!Color getRandColor(int fc,int bc){         Random random = new Random();        if(fc>255) fc=255;        if(bc>255) bc=255;        int r=fc+random.nextInt(bc-fc);        int g=fc+random.nextInt(bc-fc);        int b=fc+random.nextInt(bc-fc);        return new Color(r,g,b);        }%><%System.setProperty("java.awt.headless", "true");response.setHeader("Pragma","No-cache");response.setHeader("Cache-Control","no-cache");response.setDateHeader("Expires", 0);

int width=60, height=20;

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = image.getGraphics();

Random random = new Random();

g.setColor(getRandColor(200,250));

g.fillRect(0, 0, width, height);

g.setFont(new Font("Times New Roman",Font.PLAIN,18));

g.setColor(getRandColor(160,200));for (int i=0;i<155;i++){  int x = random.nextInt(width); int y = random.nextInt(height);        int xl = random.nextInt(12);        int yl = random.nextInt(12); g.drawLine(x,y,x+xl,y+yl);}

String sRand="";

for (int i=0;i<4;i++){     String rand=String.valueOf(random.nextInt(10));    sRand=sRand.concat(rand);

    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));

    g.drawString(rand,13*i+6,16);}

session.setAttribute("rand",sRand);

g.dispose();

ImageIO.write(image, "JPEG", response.getOutputStream());

%>

 

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