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我自己做的系统里面用作验证码的JSP的
<%@page contentType="image/jpeg;charset=utf-8"%>
<%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" %>
<%@ page import="java.io.OutputStream" %>
<html>
<body>
<%!
Color getRandColor(int fc,int bc)
{
Random rd=new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int red=fc+rd.nextInt(bc-fc);
int green=fc+rd.nextInt(bc-fc);
int blue=fc+rd.nextInt(bc-fc);
return new Color(red,green,blue);
}
%>
<%
Random r=new Random();
response.addHeader("Pragma","No-cache");
response.addHeader("Cache-Control","no-cache");
response.addDateHeader("expires",0);
int width=90;
int height=23;
BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics gc=pic.getGraphics();
gc.setColor(getRandColor(200,250));
gc.fillRect(0,0,width,height);
String[] rNum ={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f",
"g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w",
"x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N",
"O","P","Q","R","S","T","U","V","W","X","Y","Z"};
int[] style = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.PLAIN+Font.BOLD,
Font.BOLD+Font.ITALIC,Font.PLAIN+Font.ITALIC,Font.PLAIN+Font.BOLD+Font.ITALIC};
gc.setColor(Color.WHITE);
gc.drawLine(0,30,90,10);
gc.setColor(getRandColor(160,200));
for (int i=0;i<50;i++)
{
int x = r.nextInt(width);
int y = r.nextInt(height);
int xl = r.nextInt(10);
int yl = r.nextInt(10);
gc.drawLine(x,y,x+xl,y+yl);
}
gc.setColor(getRandColor(60,150));
String rt = "";
for(int i=0;i<4;i++){
String temp = rNum[r.nextInt(62)];
rt = rt+temp;
gc.setFont(new Font("Times New Roman",style[r.nextInt(7)],15));
gc.drawString(temp,5+i*15+r.nextInt(10),10+r.nextInt(10));
}
gc.dispose();
session.setAttribute("randNum",rt);
OutputStream os=response.getOutputStream();
ImageIO.write(pic,"JPEG",os);
System.out.println("当前验证码为:"+session.getAttribute("randNum"));
os.flush();
os.close();
os=null;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
%>
</body>
</html>
<%@page contentType="image/jpeg;charset=utf-8"%>
<%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" %>
<%@ page import="java.io.OutputStream" %>
<html>
<body>
<%!
Color getRandColor(int fc,int bc)
{
Random rd=new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int red=fc+rd.nextInt(bc-fc);
int green=fc+rd.nextInt(bc-fc);
int blue=fc+rd.nextInt(bc-fc);
return new Color(red,green,blue);
}
%>
<%
Random r=new Random();
response.addHeader("Pragma","No-cache");
response.addHeader("Cache-Control","no-cache");
response.addDateHeader("expires",0);
int width=90;
int height=23;
BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics gc=pic.getGraphics();
gc.setColor(getRandColor(200,250));
gc.fillRect(0,0,width,height);
String[] rNum ={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f",
"g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w",
"x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N",
"O","P","Q","R","S","T","U","V","W","X","Y","Z"};
int[] style = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.PLAIN+Font.BOLD,
Font.BOLD+Font.ITALIC,Font.PLAIN+Font.ITALIC,Font.PLAIN+Font.BOLD+Font.ITALIC};
gc.setColor(Color.WHITE);
gc.drawLine(0,30,90,10);
gc.setColor(getRandColor(160,200));
for (int i=0;i<50;i++)
{
int x = r.nextInt(width);
int y = r.nextInt(height);
int xl = r.nextInt(10);
int yl = r.nextInt(10);
gc.drawLine(x,y,x+xl,y+yl);
}
gc.setColor(getRandColor(60,150));
String rt = "";
for(int i=0;i<4;i++){
String temp = rNum[r.nextInt(62)];
rt = rt+temp;
gc.setFont(new Font("Times New Roman",style[r.nextInt(7)],15));
gc.drawString(temp,5+i*15+r.nextInt(10),10+r.nextInt(10));
}
gc.dispose();
session.setAttribute("randNum",rt);
OutputStream os=response.getOutputStream();
ImageIO.write(pic,"JPEG",os);
System.out.println("当前验证码为:"+session.getAttribute("randNum"));
os.flush();
os.close();
os=null;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
%>
</body>
</html>
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不知道你问的是不是生成这种图片验证码？
如果只要一个随机四位数 那这行代码就够了(new Random().nextInt(9000) + 1000;),
如果是生成页面图片验证码就是下面的了:
//设定 响应模式
resp.setContentType("image/jpeg");
// 生成令牌环数据;
Integer token = new Random().nextInt(9000) + 1000;
// 保存令牌环数据到session中
req.getSession().setAttribute(IMAGE_TOKEN_NAME, token);
// 生成令牌环图片
ServletOutputStream out = resp.getOutputStream();
BufferedImage img = new BufferedImage(60, 20,
BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setColor(Color.YELLOW);
g.fillRect(0, 0, img.getWidth(), img.getHeight());
g.setColor(Color.BLUE);
g.setFont(new Font("", Font.BOLD, 18));
g.drawString(String.valueOf(token), 10, 16);
ImageIO.write(img, "jpg", out);
out.close();
如果只要一个随机四位数 那这行代码就够了(new Random().nextInt(9000) + 1000;),
如果是生成页面图片验证码就是下面的了:
//设定 响应模式
resp.setContentType("image/jpeg");
// 生成令牌环数据;
Integer token = new Random().nextInt(9000) + 1000;
// 保存令牌环数据到session中
req.getSession().setAttribute(IMAGE_TOKEN_NAME, token);
// 生成令牌环图片
ServletOutputStream out = resp.getOutputStream();
BufferedImage img = new BufferedImage(60, 20,
BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setColor(Color.YELLOW);
g.fillRect(0, 0, img.getWidth(), img.getHeight());
g.setColor(Color.BLUE);
g.setFont(new Font("", Font.BOLD, 18));
g.drawString(String.valueOf(token), 10, 16);
ImageIO.write(img, "jpg", out);
out.close();
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下面简单的介绍他们的功能和用途，执行效率等。每个都有各自的优缺点看你是做甚什么方面的研究开发用。
.net，是网站编程，现在很多都用这个，但是这个语言编程都有统一思路，很好掌握。窒息那个效率不是很高；
php 支持跨平台，很容易学会，执行的效率很高；
asp是ASP.net的前身，它比较稳定，比.net要弱一点。但是比.net好学。
jsp 是网页编程，这个学习大约一周就能搞定，不过这个得多实践，不然的话，时间长了，就容易忘记。
.net，是网站编程，现在很多都用这个，但是这个语言编程都有统一思路，很好掌握。窒息那个效率不是很高；
php 支持跨平台，很容易学会，执行的效率很高；
asp是ASP.net的前身，它比较稳定，比.net要弱一点。但是比.net好学。
jsp 是网页编程，这个学习大约一周就能搞定，不过这个得多实践，不然的话，时间长了，就容易忘记。
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