Spring Mvc添加验证码

package com.base.controller.common;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controller@RequestMapping(value="/yanzheng")public class RandomYan {private static final Logger loger = LoggerFactory.getLogger(RandomYan.class);public static final char[] CHARS = { '2', '3', '4', '5', '6', '7', '8','9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M','N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };public static Random random = new Random();public static String getRandomString() {StringBuffer buffer = new StringBuffer();for (int i = 0; i < 6; i++) {buffer.append(CHARS[random.nextInt(CHARS.length)]);}return buffer.toString();}public static Color getRandomColor() {return new Color(random.nextInt(255), random.nextInt(255),random.nextInt(255));}public static Color getReverseColor(Color c) {return new Color(255 - c.getRed(), 255 - c.getGreen(),255 - c.getBlue());}@RequestMapping("/yanzhengma")public void yanzhengma(HttpServletResponse response,HttpServletRequest request) throws IOException {response.setContentType("image/jpeg");String randomString = getRandomString();request.getSession(true).setAttribute("randomString", randomString);loger.info(new StringBuilder().append("验证码:").append(randomString).toString());int width = 100;int height = 30;Color color = getRandomColor();Color reverse = getReverseColor(color);BufferedImage bi = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D g = bi.createGraphics();g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 20));//g.setColor(Color.WHITE);g.fillRect(0, 0, width, height);g.setColor(reverse);g.drawString(randomString, 10, 22);for (int i = 0, n = random.nextInt(100); i < n; i++) {g.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);}// 转成JPEG格式ServletOutputStream out = response.getOutputStream();ImageIO.write(bi, "JPEG", out);  out.flush();}}

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