Spring MVC 图片验证码

直接代码，为了以后自己用 

package com.sunlands.tiku.common.file;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;/** * imge验证码图片 * * @author ranling * @date 2013-02-28 */@Controller@RequestMapping("/captcha")public class CaptchaImg {@RequestMapping(value = "/cimge", method = RequestMethod.GET)public void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 禁止缓存response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "No-cache");response.setDateHeader("Expires", 0);// 指定生成的响应是图片response.setContentType("image/jpeg");int width = 200;int height = 60;BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); // 创建BufferedImage类的对象Graphics g = image.getGraphics(); // 创建Graphics类的对象Graphics2D g2d = (Graphics2D) g; // 通过Graphics类的对象创建一个Graphics2D类的对象Random random = new Random(); // 实例化一个Random对象Font mFont = new Font("华文宋体", Font.BOLD, 30); // 通过Font构造字体g.setColor(getRandColor(200, 250)); // 改变图形的当前颜色为随机生成的颜色g.fillRect(0, 0, width, height); // 绘制一个填色矩形// 画一条折线BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); // 创建一个供画笔选择线条粗细的对象g2d.setStroke(bs); // 改变线条的粗细g.setColor(Color.DARK_GRAY); // 设置当前颜色为预定义颜色中的深灰色int[] xPoints = new int[3];int[] yPoints = new int[3];for (int j = 0; j < 3; j++) {xPoints[j] = random.nextInt(width - 1);yPoints[j] = random.nextInt(height - 1);}g.drawPolyline(xPoints, yPoints, 3);// 生成并输出随机的验证文字g.setFont(mFont);String sRand = "";int itmp = 0;for (int i = 0; i < 4; i++) {if (random.nextInt(2) == 1) {itmp = random.nextInt(26) + 65; // 生成A~Z的字母} else {itmp = random.nextInt(10) + 48; // 生成0~9的数字}char ctmp = (char) itmp;sRand += String.valueOf(ctmp);Color color = new Color(20 + random.nextInt(110),20 + random.nextInt(110), 20 + random.nextInt(110));g.setColor(color);/**** 随机缩放文字并将文字旋转指定角度 **/// 将文字旋转指定角度Graphics2D g2d_word = (Graphics2D) g;AffineTransform trans = new AffineTransform();trans.rotate(random.nextInt(45) * 3.14 / 180, 15 * i + 10, 7);// 缩放文字float scaleSize = random.nextFloat() + 0.8f;if (scaleSize > 1.1f)scaleSize = 1f;trans.scale(scaleSize, scaleSize);g2d_word.setTransform(trans);/************************/g.drawString(String.valueOf(ctmp), 30 * i + 40, 16);}// 将生成的验证码保存到Session中HttpSession session = request.getSession(true);session.setAttribute("randCheckCode", sRand);g.dispose();ImageIO.write(image, "JPEG", response.getOutputStream());}public Color getRandColor(int s, int e) {Random random = new Random();if (s > 255)s = 255;if (e > 255)e = 255;int r = s + random.nextInt(e - s);int g = s + random.nextInt(e - s);int b = s + random.nextInt(e - s);return new Color(r, g, b);}}