Struts2 ----图片验证码

最新推荐文章于 2021-02-16 02:14:46 发布

转载最新推荐文章于 2021-02-16 02:14:46 发布 · 793 阅读

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本文介绍了如何使用jQuery和Struts2框架来生成验证码图片，包括图片的生成过程和存取方式，以及如何在HTML页面中显示并更新验证码。

首先当然要导入各种需要的包和jQuery.js
Action.RandomImg.java

package Action;  
  
import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics;  
import java.awt.image.BufferedImage;  
import java.io.ByteArrayInputStream;  
import java.io.ByteArrayOutputStream;  
import java.util.Random;  
import javax.imageio.ImageIO;  
import javax.imageio.stream.ImageOutputStream;  
import com.opensymphony.xwork2.ActionContext;  
import com.opensymphony.xwork2.ActionSupport;  
/** 
 * Pic validator 
 * @author WalkingDog 
 * 
 */  
public class RandomImg extends ActionSupport  
{  
    private ByteArrayInputStream inputStream;  
    public ByteArrayInputStream getInputStream()  
    {  
        return inputStream;  
    }  
    public void setInputStream(ByteArrayInputStream inputStream)  
    {  
        this.inputStream = inputStream;  
    }  
  
    @Override  
    public String execute() throws Exception  
    {  
        int width = 85, height = 20;  
        BufferedImage image = new  BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
        Graphics g = image.getGraphics();  
        Random random = new Random();  
        g.setColor(getRandColor(200, 255));  
        g.fillRect(0, 0, width, height);  
          
        g.setFont(new Font("Times New Roman", Font.PLAIN, 18));  
        g.setColor(getRandColor(160, 200));  
        for(int i = 0; i < 155; i++)  
        {  
            int x1 = random.nextInt(width);  
            int y1 = random.nextInt(height);  
            int x2 = random.nextInt(12);  
            int y2 = random.nextInt(12);  
            g.drawLine(x1, y1, x2, y2);  
        }  
          
        String sRand = "";  
        for(int i = 0; i < 6; i++)  
        {  
            String rand = getRandomChar();  
            sRand += rand;  
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));  
            g.drawString(rand, 13*i+6, 16);  
        }  
        ActionContext.getContext().getSession().put("randomImg", sRand.toLowerCase());//存进session,用于验证  
        g.dispose();  
        ByteArrayOutputStream output = new ByteArrayOutputStream();  
        ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);  
        ImageIO.write(image, "JPEG", imageOut);  
        imageOut.close();  
        ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());  
        this.setInputStream(input);  
        return SUCCESS;  
          
    }  
      
    private Color getRandColor(int fc, int bc)  
    {  
        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);  
    }  
    private static String getRandomChar()  
    {  
          int rand = (int)Math.round(Math.random() * 2);  
          long itmp = 0;  
          char ctmp = '\u0000';  
          switch (rand)  
          {  
               case 1:  
                    itmp = Math.round(Math.random() * 25 + 65);  
                    ctmp = (char)itmp;  
                    return String.valueOf(ctmp);  
               case 2:  
                    itmp = Math.round(Math.random() * 25 + 97);  
                    ctmp = (char)itmp;  
                    return String.valueOf(ctmp);  
               default :  
                    itmp = Math.round(Math.random() * 9);  
                  
          }  
          return String.valueOf(itmp);  
    }  
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE struts PUBLIC  
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"  
    "http://struts.apache.org/dtds/struts-2.0.dtd">  
<struts>  
    <package name="struts2" extends="struts-default">  
        <!-- 验证码图片 -->  
        <action name="randomImg" class="Action.RandomImg">  
            <result type="stream">  
                <param name="contentType">image/jpeg</param>  
                <param name="inputtName">inputStream</param>  
            </result>  
        </action>  
  
    </package>  
</struts>

randomImg.html

<html>  
<head>  
<title>randomImg.html</title>  
<script type="text/javascript" src="js/jquery.js"></script>  
<script type="text/javascript">  
function chageValidateCode()  
{  
    var timenow = new Date().getTime();  
    $("img.validate").attr("src", "randomImg.action?d="+timenow);  
}  
</script>  
</head>  
<body>  
validateCode:<input type="text" name="validateCode" size="10"/>  
<img class="validate" src="randomImg.action" onclick="chageValidateCode()"/>  
</body>  
</html>

转自：http://blog.youkuaiyun.com/vipwalkingdog/article/details/7339910