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<%@page import="javax.imageio.ImageIO"%><%@page import="java.io.ByteArrayOutputStream"%><%@page import="java.awt.Font"%><%@page import="java.awt.Color"%><%@page import="java.awt.Graphics"%><%@page import="java.awt.image.BufferedImage"%><%@ page language="java" contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%><!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=utf-8"><title>Insert title here</title></head><body><%response.setHeader("Expires", "0");String oldChars="ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";//验证码待选字符String []codeChars = new String[5];String saveCode="";for(int i=0;i<5;i++){int index=(int)(35*Math.random());codeChars[i]=""+oldChars.charAt(index);saveCode+=codeChars[i];}session.setAttribute("savedCheckCode",saveCode);BufferedImage bi= new BufferedImage(80,20,BufferedImage.TYPE_USHORT_555_RGB);Graphics gra=bi.getGraphics();gra.setColor(Color.LIGHT_GRAY);gra.fillRect(0, 0, 80, 20);gra.setColor(Color.black);//设置字体颜色Font font = new Font("Monotype Corsiva",Font.ITALIC,18);//设置字体gra.setFont(font);gra.drawString(codeChars[0], 1, 15);gra.drawString(codeChars[1], 16, 13);gra.drawString(codeChars[2], 31, 18);gra.drawString(codeChars[3], 46, 14);gra.drawString(codeChars[4], 61, 15);gra.dispose();//释放资源，完成绘图ByteArrayOutputStream image = new ByteArrayOutputStream();ImageIO.write(bi,"jpeg",image);byte[] imageByte = image.toByteArray();response.setContentLength(imageByte.length);response.setContentType("image/jpeg");ServletOutputStream sos = response.getOutputStream();sos.write(imageByte);sos.flush();image.close();sos.close();%></body></html>