基于SpringMVC annotation 的图形验证码 主要是controller的写法 实现前台验证码的显示 和刷新 验证功能相信大家都能写出来 访问 http://localhost:8080/SpringMVC_annotation_volidate/login jsp页面关键代码 function changeValidateCode(obj){ var timeNow = new Date().getTime(); obj.src="checkCode/service.do?ti me="+timeNow; } .. .. .. .. Controller package qianyan.mofi.controller; 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.HttpServlet; 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; @Controller @RequestMapping("/checkCode") public class CheckCodeController extends HttpServlet { public CheckCodeController() { super(); } public void destroy() { super.destroy(); } public void init() throws ServletException { super.init(); } 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); } @RequestMapping("service.do") 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()); } } me="+timeNow; } .. .. .. .. Controller package qianyan.mofi.controller; 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.HttpServlet; 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; @Controller @RequestMapping("/checkCode") public class CheckCodeController extends HttpServlet { public CheckCodeController() { super(); } public void destroy() { super.destroy(); } public void init() throws ServletException { super.init(); } 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); } @RequestMapping("service.do") 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()); } }