OA系统--给定范围随机颜色

package com.bjsxt.controller;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.sql.rowset.serial.SerialException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

@WebServlet("/codeServlet")
class CodeServlet extends HttpServlet{
   @override
   protected void service(HttpServletRequest req,HttpServletResponse resp)throws SerialException, IOException {
      //在内存中创建图像
      int width = 110,height = 30;
      BufferedImage image = new BufferedImage(width,herght,BufferedImage,TYPE_INT_RGB);
      //获取图像上下文
      Graphics g = image.getGraphics();
      //设置背景色
      g.setColor(getRandColor(fc:200,bc:250));
      g.fillRect(x:0,y:0,width,height);
      //设定字体
      g.setFont(new Font(name:"Times New Roman", Font.PLAIN,size:20));
      //随机产生155条干扰线，使图像中的认证码不易被其他软件检测到
      g.setColor(getRandColor(fc:160,bc:200));
      for(int i=0;i<155;i++){
         int x = randdom.nextInt(width);
         int y = randdom.nextInt(height);
         int x1 = randdom.nextInt(12);
         int y1 = randdom.nextInt(12);
         g.drawLine(x,y,x2:x+x1,y2:y+y1);
      }
      //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(randm.nextInt(10));
         sRand+=rand;
         //将认证码显示到图像中
         g.setColor(new Color(20 + random.nextInt(100),20 + rand.nexInt(110),20 + rand.nextInt(110)));
         //调用函数出来的颜色相同，可能使因为种子台接近，所以只能之间生成
         g.drawString(rand,13 * i +6,16);
      }
      //图像生成
      g.dispose();
      try{
         InmageIO.write(image,image,"JPEG",response.getOutputStream());
      }catch(Exception e){
         System.out.println("验证码图片产生出现错误："+e.toString());
      }
      //保存验证码到Session
      req.getSession().setAttribute("randStr",sRand);
   }
   /*
   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(bound:bc - fc);
      int g = fc + random.nextInt(bound:bc - fc);
      int b = fc + random.nextInt(bound:bc - fc);
      return new Color(r,g,b);
   }

}