<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="utf-8"%> <%!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(10); int yl = random.nextInt(10); 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("checkCode", sRand); g.dispose(); ImageIO.setUseCache(true); ImageIO.write(image, "JPEG", response.getOutputStream()); out.clear(); out = pageContext.pushBody();%>
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%> <%@ page import ="java.awt.*,java.awt.image.*,javax.imageio.*"%> <%! Color getRandColor(int fc,int bc)//在确定的范围内获得随机颜色 { 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); } %> <% response.setHeader("Pragma","No-cache");//设置页面不缓存 response.setHeader("Cache-Control","no-cache"); response.setDateHeader("Expire",0); int width=60; int height=20; BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR); 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)); //随机产生50条干扰线,使图像不易被探测到 g.setColor(getRandColor(160,200)); for(int i=0;i<50;i++) { int x=random.nextInt(width); int y=random.nextInt(height); int xl=random.nextInt(width); int yl=random.nextInt(height); g.drawLine(x,y,x+xl,y+yl); } String sRand=""; for(int i=0;i<4;i++) { String rand=String.valueOf(random.nextInt(10)); 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); } session.setAttribute("rand",sRand);//将验证码存入session g.dispose();//图像生效 ImageIO.write(image,"JPEG",response.getOutputStream());//输出图像到页面 %>
import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="utf-8"%>
<%!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(10);
int yl = random.nextInt(10);
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("checkCode", sRand);
g.dispose();
ImageIO.setUseCache(true);
ImageIO.write(image, "JPEG", response.getOutputStream());
out.clear();
out = pageContext.pushBody();%>
<%@ page import ="java.awt.*,java.awt.image.*,javax.imageio.*"%>
<%!
Color getRandColor(int fc,int bc)//在确定的范围内获得随机颜色
{
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);
}
%>
<%
response.setHeader("Pragma","No-cache");//设置页面不缓存
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expire",0);
int width=60;
int height=20;
BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);
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));
//随机产生50条干扰线,使图像不易被探测到
g.setColor(getRandColor(160,200));
for(int i=0;i<50;i++)
{
int x=random.nextInt(width);
int y=random.nextInt(height);
int xl=random.nextInt(width);
int yl=random.nextInt(height);
g.drawLine(x,y,x+xl,y+yl);
}
String sRand="";
for(int i=0;i<4;i++)
{
String rand=String.valueOf(random.nextInt(10));
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);
}
session.setAttribute("rand",sRand);//将验证码存入session
g.dispose();//图像生效
ImageIO.write(image,"JPEG",response.getOutputStream());//输出图像到页面
%>