<span style="font-size:14px;">package com.visec.mall.vipUser.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
/***
* 生成验证码
* @author visec、Dana
*/
public class CheckCodeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CheckCodeServlet() {
super();
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("image/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
HttpSession session = request.getSession();
//BufferedImage生成验证图片属性
int width = 75, height = 25;
BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
//Graphics画图
Graphics g = image.getGraphics();
//生成随机数
Random random = new Random();
//设置验证码背景颜色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
//设置字体样式
g.setFont(new Font("Times New Roman", Font.PLAIN, 24));
//设置 字体颜色
g.setColor(getRandColor(160, 200));
g.drawRect(0, 0, width - 1, height - 1);
//产生随机数
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 += rand;
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
g.drawString(rand, 13 * i + 14, 20);
}
//设置Session
session.setAttribute("checkCode", sRand);
//释放资源
g.dispose();
//生成图片
ImageIO.write(image, "JPEG", response.getOutputStream());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
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);
}
}</span>
