image.jsp

基于jsp的固定资产管理系统,自己做的

<%@ page contentType="image/jpeg" import="java.awt.*,   
java.awt.image.*,java.util.*,javax.imageio.*"  pageEncoding="gbk"%>   
<%!   
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);   
}   
%>   
<%   
//out.clear();//这句针对resin服务器，如果是tomacat可以不要这句   
response.setHeader("Pragma","No-cache");   
response.setHeader("Cache-Control","no-cache");   
response.setDateHeader("Expires", 0);   
  
int width=60, height=20;   
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);   
  
  
Graphics g = image.getGraphics();   
Random random = new Random();   
  
g.setColor(getRandColor(200,250));   
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 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);   
}   
  
char c[] = new char[62];   
  
for (int i = 97, j = 0; i < 123; i++, j++) {   
c[j] = (char) i;   
}   
for (int o = 65, p = 26; o < 91; o++, p++) {   
c[p] = (char) o;   
}   
for (int m = 48, n = 52; m < 58; m++, n++) {   
c[n] = (char) m;   
}           
String sRand="";   
for (int i=0;i<4;i++){   
int x = random.nextInt(62);   
String rand=String.valueOf(c[x]);   
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);   
}   
  
// 将认证码存入SESSION   
session.setAttribute("rand",sRand);   
  
g.dispose();   
  
ImageIO.write(image, "JPEG", response.getOutputStream());   
out.clear();   
out = pageContext.pushBody();    
%>