RandomCheckNumAction.java

package com.jshoperx.action.backstage.utils;

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;

/**
* Created with sdywcd@gmail.com
* Author:sdywcd@gmail.com
* Date:15/7/23
* Time:下午5:13
* Note:随即加密图片生成类
**/
public class RandomCheckNumAction extends ActionSupport {

	
	 private ByteArrayInputStream inputStream;  
	  
     public String execute() throws Exception{  
 //       在内存中创建图象  
         int width=85, height=20;  
         BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
 //       获取图形上下文  
         Graphics g = image.getGraphics();  
 //      生成随机类  
         Random random = new Random();  
 //       设定背景色  
         g.setColor(getRandColor(200,250));  
         g.fillRect(0, 0, width, height);  
 //      设定字体  
         g.setFont(new Font("Times New Roman",Font.PLAIN,18));  
 //       随机产生155条干扰线，使图象中的认证码不易被其它程序探测到  
         g.setColor(getRandColor(160,200));  
         for (int i=0;i<155;i++)  
         {  
          int x = random.nextInt(width);  
          int y = random.nextInt(height);  
                 int xl = random.nextInt(12);  
                 int yl = random.nextInt(12);  
          g.drawLine(x,y,x+xl,y+yl);  
         }  
 //       取随机产生的认证码(6位数字)  
         String sRand="";  
         for (int i=0;i<6;i++){  
             String rand=String.valueOf(random.nextInt(10));  
             sRand+=rand;  
             // 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)));  
 //      调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成  
             g.drawString(rand,13*i+6,16);  
         }  
 //       将认证码存入SESSION  
         ActionContext.getContext().getSession().put("rand",sRand);  
 //       图象生效  
         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;  
     }  
     /*  
      * 给定范围获得随机颜色  
      */  
     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);  
    }  
     public void setInputStream(ByteArrayInputStream inputStream) {  
         this.inputStream = inputStream;  
     }  
     public ByteArrayInputStream getInputStream() {  
         return inputStream;  
     }  
	
	
}