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      JSP随机验证图片如何制作
      发布时间:2016-11-05 08:37:43 关键词: jsp随机验证码,jsp验证图片
      内容简介:这篇文章主要介绍了JSP随机验证图片是如何制作的,感兴趣的朋友可以参考一下

    小编整理了一篇关于模仿腾讯随机验证图片的文章。下面直接上代码吧!一个Java 类和一个JSP 页面。

    Java类代码:

    以下是JSP模仿腾讯随机验证图片引用片段:

    package icewee.image;
    
    import java.awt.BasicStroke;
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics2D;
    import java.awt.RenderingHints;
    import java.awt.geom.Line2D;
    import java.awt.image.BufferedImage;
    import java.util.Random;
    
    public class TokenUtil {
      private static final String base = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefhijklmnpqrstuvwxyz";
      private static final int length = base.length();
    
      public static BufferedImage createTokenImage(int width, int height,
          String randomCode) {
        BufferedImage image = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_RGB);
        Graphics2D g = image.createGraphics();
        Random random = new Random();
        g.setColor(new Color(230, 230, 250)); // 设置背景色
        g.fillRect(0, 0, width, height); // 填充背景
        g.setColor(Color.BLACK);
        // 绘制边缘
        g.drawRect(-1, -1, width + 1, height + 1);
        g.setColor(Color.GRAY);
        // 设置字体,随机选择字体,暂设置8种字体
        Font font = new Font((new String[] { "Arial", "Arial Black",
            "Arial Italic", "Courier New", "Courier New Bold Italic",
            "Courier New Italic", "Franklin Gothic Medium",
            "Franklin Gothic Medium Italic" })[random.nextInt(8)],
            Font.PLAIN, 30);
        // g.setStroke(new BasicStroke((float)(Math.random()),
        // BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
        g.setFont(font);
        // 定义字体颜色范围
        int red = random.nextInt(160), green = random.nextInt(50), blue = random
            .nextInt(50);
        // 定义一个无干扰线区间和一个起始位置
        int nor = random.nextInt(50), rsta = random.nextInt(131);
        // 绘制干扰正弦曲线 M:曲线平折度, D:Y轴常量 V:X轴焦距
        int M = random.nextInt(15) + 5, D = random.nextInt(23) + 15, V = random
            .nextInt(5) + 1;
        double x = 0.0;
        double y = M * Math.sin(Math.toRadians(V * x)) + D;
        double px, py;
        for (int i = 0; i < 131; i++) {
          px = x + 1;
          py = M * Math.sin(Math.toRadians(V * px)) + D;
          if (rsta < i && i < (rsta + nor))
            g.setColor(new Color(230, 230, 250));
          else
            g.setColor(new Color(red, green, blue));
          // 随机设置像素点宽带(线宽)
          g.setStroke(new BasicStroke((float) (Math.random() + 1.5f)));
          g.draw(new Line2D.Double(x, y, px, py));
          x = px;
          y = py;
        }
        char[] codes = randomCode.toCharArray();
        for (int i = 0; i < codes.length; i++) {
          // 旋转图形
          int degree = (random.nextInt(20) - 10) % 360;
          double ang = degree * 0.0174532925; // 将角度转为弧度
          g.rotate(ang, width / 2, height / 2);
          g.setColor(new Color(red, green, blue));
          g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
              RenderingHints.VALUE_ANTIALIAS_ON);
          int gr = random.nextInt(8);
          g.drawString(String.valueOf(codes[i]), 24 * i + 10 + gr, 38);
        }
        g.dispose();
        return image;
      }
    
      public static String createRandomCode(int size, int width, int height) {
        StringBuffer randomCode = new StringBuffer();
        for (int i = 0; i < size; i++) {
          Random random = new Random();
          int start = random.nextInt(length);
          String strRand = base.substring(start, start + 1);
          randomCode.append(strRand);
        }
        return randomCode.toString();
      }
    }
    

    JSP页面:

    以下是JSP模仿腾讯随机验证图片代码引用片段:

    <%@ page contentType="image/jpeg" pageEncoding="GBK"%>
    <%@ page import="java.awt.image.BufferedImage" %>
    <%@page import="javax.imageio.ImageIO" %>
    <%@ page import="com.icesoft.image.TokenUtil" %>
    
    <%
      //设置页面不缓存
      response.setHeader("Pragma", "No-cache");
      response.setHeader("Cache-Control", "no-cache");
      response.setDateHeader("Expires", 0);
      int width = 120, height = 50;
      String randomCode = TokenUtil.createRandomCode(4, width, height);
      System.out.println("生成的随机码:" + randomCode);
      BufferedImage image = TokenUtil.createTokenImage(width, height, randomCode);
      ImageIO.write(image, "JPEG", response.getOutputStream());
      response.flushBuffer();
      out.clear();
      out = pageContext.pushBody();
    %>
    

    以上就是JSP 模仿腾讯随机验证图片全部代码,希望对大家的学习有所帮助。

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