import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.File;import java.util.LinkedList;import java.util.Random;import javax.imageio.ImageIO;public class CretImag {private Font mFont = new Font("Times New Roman", Font.BOLD, 18); // 设置字体public void crimage(String fileName) throws InterruptedException {int width = 60, height = 20;BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB); // 设置图片大小的Graphics gra = image.getGraphics();Random random = new Random();gra.setColor(getRandColor(200, 250)); // 设置背景色gra.fillRect(0, 0, width, height);gra.setColor(Color.black); // 设置字体色gra.setFont(mFont);// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到gra.setColor(getRandColor(160, 200));for (int i = 0; i < 155; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);gra.drawLine(x, y, x + xl, y + yl);}//设置备选汉字，剔除一些不雅的汉字 String base = "/u7684/u4e00/u4e86/u662f/u6211/u4e0d/u5728/u4eba/u4eec/u6709/u6765/u4ed6/u8fd9/u4e0a/u7740/u4e2a/u5730/u5230/u5927/u91cc/u8bf4/u5c31/u53bb/u5b50/u5f97/u4e5f/u548c/u90a3/u8981/u4e0b/u770b/u5929/u65f6/u8fc7/u51fa/u5c0f/u4e48/u8d77/u4f60/u90fd/u628a/u597d/u8fd8/u591a/u6ca1/u4e3a/u53c8/u53ef/u5bb6/u5b66/u53ea/u4ee5/u4e3b/u4f1a/u6837/u5e74/u60f3/u751f/u540c/u8001/u4e2d/u5341/u4ece/u81ea/u9762/u524d/u5934/u9053/u5b83/u540e/u7136/u8d70/u5f88/u50cf/u89c1/u4e24/u7528/u5979/u56fd/u52a8/u8fdb/u6210/u56de/u4ec0/u8fb9/u4f5c/u5bf9/u5f00/u800c/u5df1/u4e9b/u73b0/u5c71/u6c11/u5019/u7ecf/u53d1/u5de5/u5411/u4e8b/u547d/u7ed9/u957f/u6c34/u51e0/u4e49/u4e09/u58f0/u4e8e/u9ad8/u624b/u77e5/u7406/u773c/u5fd7/u70b9/u5fc3/u6218/u4e8c/u95ee/u4f46/u8eab/u65b9/u5b9e/u5403/u505a/u53eb/u5f53/u4f4f/u542c/u9769/u6253/u5462/u771f/u5168/u624d/u56db/u5df2/u6240/u654c/u4e4b/u6700/u5149/u4ea7/u60c5/u8def/u5206/u603b/u6761/u767d/u8bdd/u4e1c/u5e2d/u6b21/u4eb2/u5982/u88ab/u82b1/u53e3/u653e/u513f/u5e38/u6c14/u4e94/u7b2c/u4f7f/u5199/u519b/u5427/u6587/u8fd0/u518d/u679c/u600e/u5b9a/u8bb8/u5feb/u660e/u884c/u56e0/u522b/u98de/u5916/u6811/u7269/u6d3b/u90e8/u95e8/u65e0/u5f80/u8239/u671b/u65b0/u5e26/u961f/u5148/u529b/u5b8c/u5374/u7ad9/u4ee3/u5458/u673a/u66f4/u4e5d/u60a8/u6bcf/u98ce/u7ea7/u8ddf/u7b11/u554a/u5b69/u4e07/u5c11/u76f4/u610f/u591c/u6bd4/u9636/u8fde/u8f66/u91cd/u4fbf/u6597/u9a6c/u54ea/u5316/u592a/u6307/u53d8/u793e/u4f3c/u58eb/u8005/u5e72/u77f3/u6ee1/u65e5/u51b3/u767e/u539f/u62ff/u7fa4/u7a76/u5404/u516d/u672c/u601d/u89e3/u7acb/u6cb3/u6751/u516b/u96be/u65e9/u8bba/u5417/u6839/u5171/u8ba9/u76f8/u7814/u4eca/u5176/u4e66/u5750/u63a5/u5e94/u5173/u4fe1/u89c9/u6b65/u53cd/u5904/u8bb0/u5c06/u5343/u627e/u4e89/u9886/u6216/u5e08/u7ed3/u5757/u8dd1/u8c01/u8349/u8d8a/u5b57/u52a0/u811a/u7d27/u7231/u7b49/u4e60/u9635/u6015/u6708/u9752/u534a/u706b/u6cd5/u9898/u5efa/u8d76/u4f4d/u5531/u6d77/u4e03/u5973/u4efb/u4ef6/u611f/u51c6/u5f20/u56e2/u5c4b/u79bb/u8272/u8138/u7247/u79d1/u5012/u775b/u5229/u4e16/u521a/u4e14/u7531/u9001/u5207/u661f/u5bfc/u665a/u8868/u591f/u6574/u8ba4/u54cd/u96ea/u6d41/u672a/u573a/u8be5/u5e76/u5e95/u6df1/u523b/u5e73/u4f1f/u5fd9/u63d0/u786e/u8fd1/u4eae/u8f7b/u8bb2/u519c/u53e4/u9ed1/u544a/u754c/u62c9/u540d/u5440/u571f/u6e05/u9633/u7167/u529e/u53f2/u6539/u5386/u8f6c/u753b/u9020/u5634/u6b64/u6cbb/u5317/u5fc5/u670d/u96e8/u7a7f/u5185/u8bc6/u9a8c/u4f20/u4e1a/u83dc/u722c/u7761/u5174/u5f62/u91cf/u54b1/u89c2/u82e6/u4f53/u4f17/u901a/u51b2/u5408/u7834/u53cb/u5ea6/u672f/u996d/u516c/u65c1/u623f/u6781/u5357/u67aa/u8bfb/u6c99/u5c81/u7ebf/u91ce/u575a/u7a7a/u6536/u7b97/u81f3/u653f/u57ce/u52b3/u843d/u94b1/u7279/u56f4/u5f1f/u80dc/u6559/u70ed/u5c55/u5305/u6b4c/u7c7b/u6e10/u5f3a/u6570/u4e61/u547c/u6027/u97f3/u7b54/u54e5/u9645/u65e7/u795e/u5ea7/u7ae0/u5e2e/u5566/u53d7/u7cfb/u4ee4/u8df3/u975e/u4f55/u725b/u53d6/u5165/u5cb8/u6562/u6389/u5ffd/u79cd/u88c5/u9876/u6025/u6797/u505c/u606f/u53e5/u533a/u8863/u822c/u62a5/u53f6/u538b/u6162/u53d4/u80cc/u7ec6"; //备选汉字的长度 int length = base.length(); // 取随机产生的认证码(4位数字)String sRand = "";for (int i = 0; i < 4; i++) {String rand = "" ;if (i <3 ) {rand = "" + getChar();} else {int start = random.nextInt(length); rand=base.substring(start,start+1); gra.setFont(new Font("楷体", Font.CENTER_BASELINE, 16));};System.out.println(rand);//String rand = String.valueOf(random.nextInt(10));sRand += rand;Thread.sleep(new Random().nextInt(10) + 10);// 休眠以控制字符的重复问题// 将认证码显示到图象中gra.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); // 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gra.drawString(rand, 13 * i + 6, 16);}System.out.println("随机产生的认证码:" + sRand);try {File f = new File(fileName);if (!f.exists()) {f.createNewFile();} else {Thread.sleep(200);f.delete();f.createNewFile();}ImageIO.write(image, "jpg", f);} catch (Exception e) {e.printStackTrace();}}/** * 获取随机字符 */ @SuppressWarnings("unchecked")static char getChar() { Random random = new Random(); char ch = '0'; LinkedList ls = new LinkedList(); for (int i = 0; i < 10; i++) {// 0-9 ls.add(String.valueOf(48 + i)); } for (int i = 0; i < 26; i++) {// A-Z ls.add(String.valueOf(65 + i)); } for (int i = 0; i < 26; i++) {// a-z ls.add(String.valueOf(97 + i)); } int index = random.nextInt(ls.size()); if (index > (ls.size() - 1)) { index = ls.size() - 1; } ch = (char)Integer.parseInt(String.valueOf(ls.get(index))); System.out.println("Ch:" + ch); return ch; } static Color getRandColor(int fc, int bc) { // 给定范围获得随机颜色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);}/** * 测试 */public static void main(String[] args) throws Exception {CretImag c = new CretImag();c.crimage("d://heardy//yzm.jpg");}}import java.awt.Color;import java.awt.Font;impo</p></div><br /><hr><link rel="stylesheet" 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