java验证码-汉字验证码

今天整理了一个java实现的汉字输入验证码

主要包含两个类，一个是生成验证码，一个是判断验证码输入是否正确

实现原理非常简单，将汉字和干扰线生成图片并将汉字保存到session，前台获取每次生成验证码图片并用文本框值和session值比较，功能就怎么简单。

 

• 生成汉字验证码源码展示

• package xwcms.net.service;
  import java.awt.Color;
  import java.awt.Font;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import java.util.Random;
  import javax.imageio.ImageIO;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  /**
   * 生成随机汉字
   * 
   * @author xw素材网提供
   * 
   */
  public class DrawImage extends HttpServlet {
      public static final int WIDTH = 120;
      public static final int HEIGHT = 30;
      public void doGet(HttpServletRequest request, HttpServletResponse response)
              throws ServletException, IOException {
          this.doPost(request, response);
      }
      public void doPost(HttpServletRequest request, HttpServletResponse response)
              throws ServletException, IOException {
          request.setCharacterEncoding("utf-8");
          response.setContentType("text/html;charset=utf-8");
          // 创建缓存
          BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,
                  BufferedImage.TYPE_INT_RGB);
          // 获得画布
          Graphics g = bi.getGraphics();
          // 设置背影色
          setBackGround(g);
          // 设置边框
          setBorder(g);
          // 画干扰线
          drawRandomLine(g);
          // 写随机数
          String random = drawRandomNum((Graphics2D) g);
          // 将随机汉字存在session中
          request.getSession().setAttribute("checkcode", random);
          // 将图形写给浏览器
          response.setContentType("image/jpeg");
          // 发头控制浏览器不要缓存
          response.setDateHeader("expries", -1);
          response.setHeader("Cache-Control", "no-cache");
          response.setHeader("Pragma", "no-cache");
          // 将图片写给浏览器
          ImageIO.write(bi, "jpg", response.getOutputStream());
      }
      /**
       * 设置背景色
       * 
       * @param g
       */
      private void setBackGround(Graphics g) {
          // 设置颜色
          g.setColor(Color.WHITE);
          // 填充区域
          g.fillRect(0, 0, WIDTH, HEIGHT);
      }
      /**
       * 设置边框
       * 
       * @param g
       */
      private void setBorder(Graphics g) {
          // 设置边框颜色
          g.setColor(Color.BLUE);
          // 边框区域
          g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2);
      }
      /**
       * 画随机线条
       * 
       * @param g
       */
      private void drawRandomLine(Graphics g) {
          // 设置颜色
          g.setColor(Color.GREEN);
          // 设置线条个数并画线
          for (int i = 0; i < 5; i++) {
              int x1 = new Random().nextInt(WIDTH);
              int y1 = new Random().nextInt(HEIGHT);
              int x2 = new Random().nextInt(WIDTH);
              int y2 = new Random().nextInt(HEIGHT);
              g.drawLine(x1, y1, x2, y2);
          }
      }
      /**
       * 画随机汉字
       * 
       * @param g
       * @return
       */
      private String drawRandomNum(Graphics2D g) {
          StringBuffer sb = new StringBuffer();
          // 设置颜色
          g.setColor(Color.RED);
          // 设置字体
          g.setFont(new Font("宋体", Font.BOLD, 20));
          // 准备常用汉字集
          String base = "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";
          int x = 5;
          // 控制字数
          for (int i = 0; i < 4; i++) {
              // 设置字体旋转角度
              int degree = new Random().nextInt() % 30;
              // 截取汉字
              String ch = base.charAt(new Random().nextInt(base.length())) + "";
              sb.append(ch);
              // 正向角度
              g.rotate(degree * Math.PI / 180, x, 20);
              g.drawString(ch, x, 20);
              // 反向角度
              g.rotate(-degree * Math.PI / 180, x, 20);
              x += 30;
          }
          return sb.toString();
      }
  }

  java汉字验证码源码下载地址：

• 汉字验证码.rar