本文实例为大家分享了java生成验证码图片的具体代码,供大家参考,具体内容如下
示例一:
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import org.apache.commons.codec.binary.Base64; import org.apache.commons.lang.RandomStringUtils; import org.apache.commons.lang.StringUtils; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.util.Random; public class RandomVerifyCode { private static final String RANDOM_NUM = "23456789" ; private static final String RANDOM_LETTER = "ABCDEFGHJKMNPQRSTUVWXYZ" ; private static final String RANDOM_LETTER_SMALL = "abcdefghjkmnpqrstuvwxyz" ; private static final String RANDOM_STRING = RANDOM_NUM + RANDOM_LETTER + RANDOM_LETTER_SMALL; private int width = 95 ; // 图片宽 private int height = 25 ; // 图片高 private int lineSize = 40 ; // 干扰线数量 private int stringNum = 4 ; // 随机产生字符数量 private Random random = new Random(); /** * 获得字体 */ private Font getFont() { return new Font( "Fixedsys" , Font.CENTER_BASELINE, 18 ); } /** * 获得颜色 */ private Color getRandColor( int fc, int bc) { if (fc > 255 ) fc = 255 ; if (bc > 255 ) bc = 255 ; int r = fc + random.nextInt(bc - fc - 16 ); int g = fc + random.nextInt(bc - fc - 14 ); int b = fc + random.nextInt(bc - fc - 18 ); return new Color(r, g, b); } /** * 生成随机图片(BASE64格式) */ public String getRandcode(HttpServletRequest request, StringBuffer imgBuffer) { // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR); Graphics g = image.getGraphics(); // 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作 g.fillRect( 0 , 0 , width, height); //图片大小 g.setFont( new Font( "Times New Roman" , Font.ROMAN_BASELINE, 18 )); //字体大小 g.setColor(getRandColor( 110 , 133 )); //字体颜色 // 绘制干扰线 for ( int i = 0 ; i <= lineSize; i++) { drowLine(g); } // 绘制随机字符 String randomString = "" ; for ( int i = 1 ; i <= stringNum; i++) { randomString = drowString(g, randomString, i); } g.dispose(); ByteArrayOutputStream out = new ByteArrayOutputStream(); String encode = null ; try { // 将内存中的图片通过流动形式输出到客户端 ImageIO.write(image, "JPEG" , out); encode = "data:image/jpeg;base64," +Base64.encodeBase64String(out.toByteArray()); out.close(); } catch (Exception e) { LogHelper.error( "登陆控制" , "验证码生成" , "将内存中生成的验证码图片输出为BASE64格式编码失败!" ); } imgBuffer.append(encode); return randomString; } /** * 绘制字符串 */ private String drowString(Graphics g, String randomString, int i) { g.setFont(getFont()); g.setColor( new Color(random.nextInt( 101 ), random.nextInt( 111 ), random .nextInt( 121 ))); String rand = String.valueOf(getRandomString(random.nextInt(RANDOM_STRING.length()))); randomString += rand; g.translate(random.nextInt( 3 ), random.nextInt( 3 )); g.drawString(rand, 13 * i, 16 ); return randomString; } /** * 绘制干扰线 */ private void drowLine(Graphics g) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt( 13 ); int yl = random.nextInt( 15 ); g.drawLine(x, y, x + xl, y + yl); } /** * 获取随机的字符 */ public String getRandomString( int num) { return String.valueOf(RANDOM_STRING.charAt(num)); } public static String randomString( int length){ return RandomStringUtils.random(length, RANDOM_STRING.toCharArray()); } } |
示例二:
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import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.awt.image.RenderedImage; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import java.util.Random; public class CodeUtil { private static int width = 90 ; // 定义图片的width 90 private static int height = 20 ; // 定义图片的height 20 private static int codeCount = 4 ; // 定义图片上显示验证码的个数 private static int xx = 15 ; private static int fontHeight = 18 ; private static int codeY = 16 ; private static char [] codeSequence = { 'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' , 'J' , 'K' , 'M' , 'N' , 'P' , 'Q' , 'R' , 'S' , 'T' , 'U' , 'V' , 'W' , 'X' , 'Y' , 'Z' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' }; public static Map<String,RenderedImage> codePicMap = new HashMap<>(); /** * 生成一个map集合 * code为生成的验证码 * codePic为生成的验证码BufferedImage对象 * * @return */ public static Map<String, Object> generateCodeAndPic() { // 定义图像buffer BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // Graphics2D gd = buffImg.createGraphics(); // Graphics2D gd = (Graphics2D) buffImg.getGraphics(); Graphics gd = buffImg.getGraphics(); // 创建一个随机数生成器类 Random random = new Random(); // 将图像填充为蓝色 // gd.setColor(Color.WHITE); gd.setColor( new Color( 232 , 240 , 254 )); gd.fillRect( 0 , 0 , width, height); // 创建字体,字体的大小应该根据图片的高度来定。 Font font = new Font( "Fixedsys" , Font.BOLD, fontHeight); // 设置字体。 gd.setFont(font); // 画边框。 gd.setColor(Color.BLACK); gd.drawRect( 0 , 0 , width - 1 , height - 1 ); // 随机产生40条干扰线,使图象中的认证码不易被其它程序探测到。 gd.setColor(Color.BLACK); for ( int i = 0 ; i < 10 ; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt( 12 ); int yl = random.nextInt( 12 ); gd.drawLine(x, y, x + xl, y + yl); } // randomCode用于保存随机产生的验证码,以便用户登录后进行验证。 StringBuffer randomCode = new StringBuffer(); int red = 0 , green = 0 , blue = 0 ; // 随机产生codeCount数字的验证码。 for ( int i = 0 ; i < codeCount; i++) { // 得到随机产生的验证码数字。 String code = String.valueOf(codeSequence[random.nextInt( 31 )]); // 产生随机的颜色分量来构造颜色值,这样输出的每位数字的颜色值都将不同。 red = random.nextInt( 255 ); green = random.nextInt( 255 ); blue = random.nextInt( 255 ); // 用随机产生的颜色将验证码绘制到图像中。 gd.setColor( new Color(red, green, blue)); gd.drawString(code, (i + 1 ) * xx, codeY); // 将产生的四个随机数组合在一起。 randomCode.append(code); } Map<String, Object> map = new HashMap<>(); //存放验证码 map.put( "code" , randomCode); //存放生成的验证码BufferedImage对象 map.put( "codePic" , buffImg); return map; } public static void main(String[] args) throws Exception { //创建文件输出流对象 OutputStream out = new FileOutputStream( "D://img/" + System.currentTimeMillis() + ".jpg" ); Map<String, Object> map = CodeUtil.generateCodeAndPic(); ImageIO.write((RenderedImage) map.get( "codePic" ), "jpeg" , out); System.out.println( "验证码的值为:" + map.get( "code" )); } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/iloki/article/details/113996064