String sRand = ""; for (int i = 0; i < 4; i++) { String rand = String.valueOf(random.nextInt(10)); sRand += rand;
g.setColor(this.getRandColor(40,60)); g.drawString(rand, 13 * i + 6, 16); } HttpSession session = request.getSession(); session.setAttribute("rand", sRand); g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream()); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } private 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); }}
天狼工作室 http://www.j2soft.cn/
package net.qingsoft.servlet;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GraphicsEnvironment;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;public class ValidateCode extends HttpServlet
{ public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException
{
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);
Random random = new Random();
Graphics g = image.getGraphics();
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("隶书",Font.ITALIC+Font.BOLD,18));
g.setColor(new Color(33,66,99));
g.drawRect(0,0,width-1,height-1);
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
g.setColor(this.getRandColor(40,60));
g.drawString(rand, 13 * i + 6, 16);
} HttpSession session = request.getSession();
session.setAttribute("rand", sRand); g.dispose(); ImageIO.write(image, "JPEG", response.getOutputStream());
} public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
} private 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);
}}