package com.abc.ufo.util;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.OutputStream;
import java.util.Random;import javax.imageio.ImageIO;public class ImageMaker{private char map[]={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','1','2','3','4','5','6','7','8','9'};public String getImage(int width,int height,OutputStream os){BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);Graphics g=image.getGraphics();g.setColor(new Color(0xDCDCDC));g.fillRect(0, 0, width, height);StringBuilder sb=new StringBuilder();for(int i=0;i<4;i++){sb.append(map[(int)(map.length*Math.random())]);}String text=sb.toString();g.setColor(Color.black);g.setFont(new Font("Arial",Font.PLAIN,36));g.setColor(Color.red);String str=text.substring(0,1);g.drawString(str, 18, 32);g.setColor(Color.blue);str=text.substring(1,2);g.drawString(str, 60, 32);g.setColor(Color.red);str=text.substring(2,3);g.drawString(str, 95, 32);g.setColor(Color.blue);str=text.substring(3,4);g.drawString(str, 125, 32);g.setColor(Color.gray);Random rand=new Random();for(int i=0;i<20;i++){int x=rand.nextInt(width);int y=rand.nextInt(height);g.drawOval(x, y, width, height);}g.setColor(Color.black);g.drawRect(0, 0, width-1, height-1);//g.drawLine(width-2, 0, width-2, height);
        g.dispose();try{ImageIO.write(image, "JPEG", os);}catch(Exception e){//e.printStackTrace();
        }return text;}
}

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page contentType="image/jpeg" %>
<jsp:useBean id="image" scope="page" class="com.abc.ufo.util.ImageMaker"/><%String str=image.getImage(160,40,response.getOutputStream());session.setAttribute("verifyCode",str);out.clear();  out = pageContext.pushBody();
%>

<div class="page-container"><logic:present name="error"><h2><bean:write name="error"/></h2></logic:present><h1>Login</h1><form action="login.html" method="post"><input type="text" id="usernameTxt" name="username" class="username" placeholder="Username"><input type="password" id="passwordTxt" name="password" class="password" placeholder="Password"><input type="text" id="verifyCodeTxt" name="verifyCode" class="verifyCode" placeholder="Verification code"><p><br/>No Zero in the verification code</p><img src="pages/user/login/image.jsp"/> <!-- 这个路径就是前面jsp的路径 --><button id="submitBtn">Sign me in</button><div class="error"><span>+</span></div></form><div class="connect" style="display:none"><p>Or connect with:</p><p><a class="facebook" href=""></a><a class="twitter" href=""></a></p></div></div>