package com.moral.monitor.controller; import com.moral.monitor.util.ResourceUtil; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; /** * Created by a on 2017/7/4. */ @Controller @RequestMapping("/VerificationCode") public class VerificationCodeController { private static final long serialVersionUID = 1L; /** * 这里用作存入session的名称 */ private static final String SESSION_KEY_OF_RAND_CODE = "randCode"; // todo 要统一常量 /** * */ private static final int count = 150; /** * 定义图形大小(宽) */ private static final int width = 105; /** * 定义图形大小(高) */ private static final int height = 35; /** * 干扰线的长度=1.414*lineWidth */ private static final int lineWidth = 20; @RequestMapping(value = "/generate", method = { RequestMethod.POST, RequestMethod.GET }) public void VerificationCode( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 设置页面不缓存 response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); // response.setContentType("image/png"); // 在内存中创建图象 final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取图形上下文 final Graphics2D graphics = (Graphics2D) image.getGraphics(); // 设定背景颜色 graphics.setColor(Color.white); graphics.fillRect(0, 0, width, height);//填充衍射 // 设定边框颜色,绘制一个距形 //graphics.setColor(getRandColor(100, 200)); // ---2.这是以数字型来设置颜色,颜色模式是指使用三种基色:红、绿、蓝,通过三种颜色的调整得出其它各种颜色,这三种基色的值范围为0~255 graphics.drawRect(0, 0, width - 1, height - 1); final Random random = new Random(); // 随机产生干扰线,使图象中的认证码不易被其它程序探测到 for (int i = 0; i < count; i++) { graphics.setColor(getRandColor(80, 200)); // ---3. final int x = random.nextInt(width - lineWidth - 1) + 1; // 保证画在边框之内 final int y = random.nextInt(height - lineWidth - 1) + 1; final int xl = random.nextInt(20); final int yl = random.nextInt(20); graphics.drawLine(x, y, x + xl, y + yl); } // 取随机产生的认证码(4位数字) final String resultCode = exctractRandCode(); for (int i = 0; i < resultCode.length(); i++) { // 将认证码显示到图象中,调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成 // graphics.setColor(new Color(20 + random.nextInt(130), 20 + random // .nextInt(130), 20 + random.nextInt(130))); // 设置字体颜色 graphics.setColor(Color.black); // 设置字体样式 //graphics.setFont(new Font("Arial Black", Font.ITALIC, 18)); graphics.setFont(new Font("Times New Roman", Font.BOLD, 24)); // 设置字符,字符间距,上边距 /*System.out.print(resultCode.charAt(i));*/ graphics.drawString(String.valueOf(resultCode.charAt(i)), (23 * i) + 8, 26); } //System.out.println("直接输出:" + resultCode); // 将认证码存入SESSION request.getSession().setAttribute(SESSION_KEY_OF_RAND_CODE, resultCode); // 图象生效 graphics.dispose(); // 输出图象到页面 ImageIO.write(image, "JPEG", response.getOutputStream()); } /** * @return 随机码 */ private String exctractRandCode() { final String randCodeType = ResourceUtil.getRandCodeType(); int randCodeLength = Integer.parseInt(ResourceUtil.getRandCodeLength()); if (randCodeType == null) { return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength); } else { switch (randCodeType.charAt(0)) { case '1': return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength); case '2': return RandCodeImageEnum.LOWER_CHAR.generateStr(randCodeLength); case '3': return RandCodeImageEnum.UPPER_CHAR.generateStr(randCodeLength); case '4': return RandCodeImageEnum.LETTER_CHAR.generateStr(randCodeLength); case '5': return RandCodeImageEnum.ALL_CHAR.generateStr(randCodeLength); default: return RandCodeImageEnum.NUMBER_CHAR.generateStr(randCodeLength); } } } /** * 描述:根据给定的数字生成不同的颜色 * @param 这是以数字型来设置颜色,颜色模式是指使用三种基色:红、绿、蓝,通过三种颜色的调整得出其它各种颜色,这三种基色的值范围为0~255 * @param 这是以数字型来设置颜色,颜色模式是指使用三种基色:红、绿、蓝,通过三种颜色的调整得出其它各种颜色,这三种基色的值范围为0~255 * @return 描述:返回颜色 */ private Color getRandColor(int fc, int bc) { // 取得给定范围随机颜色 final Random random = new Random(); if (fc > 255) { fc = 255; } if (bc > 255) { bc = 255; } final int r = fc + random.nextInt(bc - fc); final int g = fc + random.nextInt(bc - fc); final int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); } /** * 验证码辅助类 */ enum RandCodeImageEnum { /** * 混合字符串 */ ALL_CHAR("0123456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), // 去除小写的l和o这个两个不容易区分的字符; /** * 字符 */ LETTER_CHAR("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), /** * 小写字母 */ LOWER_CHAR("abcdefghijklmnopqrstuvwxyz"), /** * 数字 */ NUMBER_CHAR("0123456789"), /** * 大写字符 */ UPPER_CHAR("ABCDEFGHIJKLMNOPQRSTUVWXYZ"); /** * 待生成的字符串 */ private String charStr; /** * @param charStr */ private RandCodeImageEnum(final String charStr) { this.charStr = charStr; } /** * 生产随机验证码 * * @param codeLength * 验证码的长度 * @return 验证码 */ public String generateStr(final int codeLength) { final StringBuffer sb = new StringBuffer(); final Random random = new Random(); final String sourseStr = getCharStr(); for (int i = 0; i < codeLength; i++) { sb.append(sourseStr.charAt(random.nextInt(sourseStr.length()))); } return sb.toString(); } /** * @return the {@link #charStr} */ public String getCharStr() { return charStr; } } }