struts2 图片验证

野性酷女 2022-06-12 11:13 183阅读 0赞

1、struts2的action类

package com.mty95190.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 nicai  
 \*  
 \*/   
public class RandomImg extends ActionSupport   
\{   
    /\*\*  
  \*  
  \*/  
 private static final long serialVersionUID = 1L;  
 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);   
    \}   
\}   
2、randomImg.jsp （javascript和jquery二中方式实现）

<%@ page language="java" import="java.util.\*" pageEncoding="UTF-8"%>  
<%  
String path = request.getContextPath();  
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  <head>  
    <base href="<%=basePath%>">  
     
    <title>我的验证码</title>  
     
 <meta http-equiv="pragma" content="no-cache">  
 <meta http-equiv="cache-control" content="no-cache">  
 <meta http-equiv="expires" content="0">     
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  
 <meta http-equiv="description" content="This is my page">  
   
        <script type="text/javascript">  
             function changeValidateCode(obj) \{  
        //获取当前的时间作为参数，无具体意义  
          var timenow = new Date().getTime();  
        //每次请求需要一个不同的参数，否则可能会返回同样的验证码  
        //据说和浏览器的缓存机制有关系，不太明白，照做吧  
        obj.src="randomImg.action?d="+timenow;  
    \}  
</script>

3、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][http_struts.apache.org_dtds_struts-2.0.dtd]">  
<struts>  
      <constant name="struts.locale" value="en\_GB"/>  
      <package name="myImg" extends="struts-default" namespace="/">  
             <action name="randomImg" class="com.mty95190.action.RandomImg">  
              <result type="stream">   
                <param name="contentType">image/jpeg</param>      
                <param name="inputName">inputStream</param>  
              </result>  
             </action>  
      </package>  
</struts>

4、web.xml

[http_struts.apache.org_dtds_struts-2.0.dtd]: http://struts.apache.org/dtds/struts-2.0.dtd