Java代码生成图片验证码实现
发布时间:2020-12-14 23:25:40 所属栏目:Java 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 介绍一个使用Java代码生成随机图片验证码的示例 Java代码随机生成图片验证码 import java.awt.Color; import java.awt.Font; import java.awt.Graphic
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介绍一个使用Java代码生成随机图片验证码的示例
Java代码随机生成图片验证码import java.awt.Color; import java.awt.Font; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import javax.imageio.ImageIO; /** * 验证码生成器 */ public class ValidateCode { // 图片的宽度。 private int width = 160; // 图片的高度。 private int height = 40; // 验证码字符个数 private int codeCount = 5; // 验证码干扰线数 private int lineCount = 150; // 验证码 private static String code = null; // 验证码图片Buffer private BufferedImage buffImg=null; private char[] codeSequence = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','1','2','3','4','5','6','7','8','9' }; public ValidateCode() { this.createCode(); } /** * * @param width 图片宽 * @param height 图片高 */ public ValidateCode(int width,int height) { this.width=width; this.height=height; this.createCode(); } /** * * @param width 图片宽 * @param height 图片高 * @param codeCount 字符个数 * @param lineCount 干扰线条数 */ public ValidateCode(int width,int height,int codeCount,int lineCount) { this.width=width; this.height=height; this.codeCount=codeCount; this.lineCount=lineCount; this.createCode(); } public void createCode() { int x = 0,fontHeight=0,codeY=0; int red = 0,green = 0,blue = 0; x = width / (codeCount +2);//每个字符的宽度 fontHeight = height - 2;//字体的高度 codeY = height - 4; // 图像buffer buffImg = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics2D g = buffImg.createGraphics(); // 生成随机数 Random random = new Random(); // 将图像填充为白色 g.setColor(Color.WHITE); g.fillRect(0,width,height); // 创建字体 ImgFontByte imgFont=new ImgFontByte(); Font font =imgFont.getFont(fontHeight); g.setFont(font); for (int i = 0; i < lineCount; i++) { int xs = random.nextInt(width); int ys = random.nextInt(height); int xe = xs+random.nextInt(width/8); int ye = ys+random.nextInt(height/8); red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red,green,blue)); g.drawLine(xs,ys,xe,ye); } // randomCode记录随机产生的验证码 StringBuffer randomCode = new StringBuffer(); // 随机产生codeCount个字符的验证码。 for (int i = 0; i < codeCount; i++) { String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]); // 产生随机的颜色值,让输出的每个字符的颜色值都将不同。 red = random.nextInt(255); green = random.nextInt(255); blue = random.nextInt(255); g.setColor(new Color(red,blue)); g.drawString(strRand,(i + 1) * x,codeY); // 将产生的四个随机数组合在一起。 randomCode.append(strRand); } // 将四位数字的验证码保存到Session中。 code = randomCode.toString(); } public void write(String path) throws IOException { OutputStream sos = new FileOutputStream(path); this.write(sos); } public void write(OutputStream sos) throws IOException { ImageIO.write(buffImg,"png",sos); sos.close(); } public BufferedImage getBuffImg() { return buffImg; } public static String getCode() { return code; } } 在 servlet 中使用该类:import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ValidateCodeServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { response.setContentType("image/jpeg"); response.setHeader("Pragma","no-cache"); response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expires",0); ValidateCode vCode = new ValidateCode(100,30,4,100); HttpSession session = request.getSession(); session.removeAttribute("validateCode"); vCode.write(response.getOutputStream()); session.setAttribute("validateCode",vCode.getCode()); vCode.write(response.getOutputStream()); } } 在 web.xml配置Servlet访问路径:<servlet> <servlet-name>validateCodeServlet</servlet-name> <servlet-class>com.rchm.util.images.ValidateCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>validateCodeServlet</servlet-name> <url-pattern>code.images</url-pattern> 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |