Struts中Action产生的图形验证码

青旅半醒 2022-08-08 19:37 130阅读 0赞

ACTION代码：

\*  
\* Generated by MyEclipse Struts  
\* Template path: templates/java/JavaClass.vtl  
\*/  
package hospital.lb.action;  
import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics;  
import java.awt.image.BufferedImage;  
import java.util.Random;  
import javax.imageio.ImageIO;  
import javax.servlet.ServletOutputStream;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import javax.servlet.http.HttpSession;  
import org.apache.commons.lang.RandomStringUtils;  
import org.apache.struts.action.Action;  
import org.apache.struts.action.ActionForm;  
import org.apache.struts.action.ActionForward;  
import org.apache.struts.action.ActionMapping;  
/\*\*  
\* MyEclipse Struts  
\*  
\* XDoclet definition:  
\* @struts.action validate="true"  
\*/  
public class ValidatecodeAction extends Action \{  
/\*  
  \* Generated Methods  
  \*/  
/\*\*  
  \* Method execute  
  \* @param mapping  
  \* @param form  
  \* @param request  
  \* @param response  
  \* @return ActionForward  
  \*/  
  public ActionForward execute(ActionMapping mapping, ActionForm form,    
        HttpServletRequest request, HttpServletResponse response) \{    
      try \{    
        int width = 50;    
        int height = 18;    
        // 取得一个4位随机字母数字字符串    
        String s = RandomStringUtils.random(4, true, true);    
            
        // 保存入session,用于与用户的输入进行比较.    
        // 注意比较完之后清除session.    
        HttpSession session = request.getSession(true);    
        session.setAttribute("validateCode", s);    
      
        response.setContentType("images/jpeg");    
        response.setHeader("Pragma", "No-cache");    
        response.setHeader("Cache-Control", "no-cache");    
        response.setDateHeader("Expires", 0);    
      
        ServletOutputStream out = response.getOutputStream();    
        BufferedImage image = new BufferedImage(width, height,    
            BufferedImage.TYPE\_INT\_RGB);    
        Graphics g = image.getGraphics();    
        // 设定背景色    
        g.setColor(getRandColor(200, 250));    
        g.fillRect(0, 0, width, height);    
      
        // 设定字体    
        Font mFont = new Font("Times New Roman", Font.BOLD, 18);// 设置字体    
        g.setFont(mFont);    
      
        // 画边框    
        // g.setColor(Color.BLACK);    
        // g.drawRect(0, 0, width - 1, height - 1);    
      
        // 随机产生干扰线，使图象中的认证码不易被其它程序探测到    
        g.setColor(getRandColor(160, 200));    
        // 生成随机类    
        Random random = new Random();    
        for (int i = 0; i < 155; i++) \{    
          int x2 = random.nextInt(width);    
          int y2 = random.nextInt(height);    
          int x3 = random.nextInt(12);    
          int y3 = random.nextInt(12);    
          g.drawLine(x2, y2, x2 + x3, y2 + y3);    
        \}    
      
        // 将认证码显示到图象中    
        g.setColor(new Color(20 + random.nextInt(110), 20 + random    
            .nextInt(110), 20 + random.nextInt(110)));    
      
        g.drawString(s, 2, 16);    
      
        // 图象生效    
        g.dispose();    
        // 输出图象到页面    
        ImageIO.write((BufferedImage) image, "JPEG", out);    
        out.close();    
      \} catch (Exception e) \{    
        e.printStackTrace();    
      \}    
      return null;    
    \}    
      
    private 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);    
  \}    
\}

JSP代码: