struts下的生成验证图片

 生成图片流

package  com.bo;

import  java.awt.Color;
import  java.awt.Font;
import  java.awt.Graphics;
import  java.awt.image.BufferedImage;
import  java.io.IOException;
import  java.io.OutputStream;
import  java.util.Random;

import  javax.imageio.ImageIO;

public   class  ImageOP  ... {
    
    private Random random;
    private BufferedImage image;
    private Font font;
    private int distance;
    
    public ImageOP(int width,int heigh,String fontStr,int sytle,int size,int distance)...{
        random = new Random();
        image = new BufferedImage(width,heigh,BufferedImage.TYPE_3BYTE_BGR);
        font = new Font(fontStr,sytle,size);
        this.distance = distance;
    }
    //默认格式
    public ImageOP()...{
        this(75,25,"宋体",Font.BOLD,25,20);
    }
    
    public String getCheckCodeImage(String str,int show,OutputStream output) throws IOException...{
        Graphics d = image.getGraphics();
        d.setColor(Color.WHITE);
        d.fillRect(0,0,image.getWidth(),image.getHeight());
        d.setColor(new Color(random.nextInt(100)+100,random.nextInt(100)+100,random.nextInt(100)+100));
        for (int i = 0; i < 10; i++) ...{
            d.drawLine(random.nextInt(image.getWidth()),random.nextInt(image.getHeight()),random.nextInt(image.getWidth()),random.nextInt(image.getHeight()));
        }
        d.setColor(Color.BLACK);
        d.setFont(font);
        String checkCode = "";
        char tmp = 0;
        int x = -distance;
        for (int i = 0; i < show; i++) ...{
            tmp = str.charAt(random.nextInt(str.length()-1));
            checkCode = checkCode + tmp;
            x = x + distance;
            d.setColor(new Color(random.nextInt(100)+50,random.nextInt(100)+50,random.nextInt(100)+50));
            d.drawString(tmp+"",x,random.nextInt(image.getHeight()-(font.getSize()/2))+(font.getSize()/2));
        }
        d.dispose();
        ImageIO.write(image,"jpeg",output);
        return checkCode;
    }
    
}

action调用的方法

 

public  ActionForward getCheckCode(ActionMapping mapping,
              ActionForm form,
              HttpServletRequest request,
              HttpServletResponse response) ... {
        try ...{
            ImageOP op = new ImageOP();
            HttpSession session = request.getSession();
            session.setAttribute("checkCode",op.getCheckCodeImage("abcdefghigklmnopqrst0123456789",4,response.getOutputStream()));
        } catch (IOException e) ...{
            e.printStackTrace();
        }
        return null;
    }

 

struts-config.xml配置

 

   < action  path ="/checkImage"
          type ="com.action.LogonAction"<!--  action调用上面的方法 -->
          name =""
          scope ="request"
          input =""
          parameter ="opName"
          validate ="false" >
   </ action >

 

页面加载

 

< html >
< script  language ="JavaScript" > ...
    function open_window() ...{
    window.location.reload();
    }
</ script >
   < head >
     < base  href ="<%=basePath%>" >
    
     < title > My JSP 'son.jsp' starting page </ 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" >
    
     <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
     -->
   </ head >
  
   < body >
             < a  href ="#"  onclick ="open_window();"  class ="global" >< img  src ="checkImage.do?opName=getCheckCode"  border ="0" ></ a ><!-- 点击图片能够刷新的图片 -->
   </ body >
</ html >

欢迎交流