左迁-
不知道楼主说的“换一个”是什么意思啊？
我这个可是可以通用的组件，放到哪一个jsp页面里都可以用啊，每次只要一刷新，生成的随机数就会自动变化啊
这个功能我刚做过，现在就跟楼主分享了啊
保证100%可以运行成功
生成随即码的jsp文件的完整代码如下：
<%@ page language="java" contentType="image/jpeg; charset=gb2312"
pageEncoding="gb2312"%>
<%@ page import="java.awt.*,java.awt.image.*" %>
<%@ page import="java.util.*,javax.imageio.*" %>
<%!
Color getRandColor(int fc,int bc){
Random r=new Random();
if(fc>255) fc=255;
if(bc>200) bc=255;
int red=fc+r.nextInt(bc-fc);
int green=fc+r.nextInt(bc-fc);
int blue=fc+r.nextInt(bc-fc);
return new Color(red,green,blue);
}%>
<% //设置页面不缓存
response.setHeader("Pragma","No-cache");
response.setHeader("cache-Control","no-cache");
response.setDateHeader("Expires",0);
//创建随机类
Random r=new Random();
//在内存中创建图像，宽度，高度
int width=80,height=30;
BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//获取图形上下文环境
Graphics gc=pic.getGraphics();
//设定背景颜色并进行填充
gc.setColor(getRandColor(200,250));
gc.fillRect(0,0,width,height);
//设定图形上下文环境字体
gc.setFont(new Font("Times New Roman",Font.PLAIN,20));
//画边框
//gc.setColor(new Color(1));
//gc.drawRect(0,0,width-1,height-1);
//随机产生200条干扰直线，使图像中的认证码不易被其他分析程序探测
gc.setColor(getRandColor(160,200));
for(int i=0;i<200;i++)
{
int x1=r.nextInt(width);
int y1=r.nextInt(height);
int x2=r.nextInt(15);
int y2=r.nextInt(15);
gc.drawLine(x1,y1,x1+x2,y1+y2);
}
//随即产生100个干扰点
gc.setColor(getRandColor(120,240));
for(int i=1;i<100;i++){
int x=r.nextInt(width);
int y=r.nextInt(height);
gc.drawOval(x,y,0,0);
}
//随机产生四位数字的验证码
String RS="";
String rn="";
for(int i=0;i<4;i++)
{
//产生十以内随机数字
rn=String.valueOf(r.nextInt(10));
RS+=rn;
//将认证码用drawString函数显示到图像里
gc.setColor(new Color(20+r.nextInt(110),20+r.nextInt(110),20+r.nextInt(110)));//使字体颜色效果明显
gc.drawString(rn,13*i+16,16);
}
//释放图形上下文环境
gc.dispose();
//将认证码RS存入session中共享
session.setAttribute("random",RS);
//输出生成后的图象到页面
ImageIO.write(pic,"JPEG",response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>
使用随即码的jsp文件中加入下面一句即可
<image src="random.jsp">
tt白-
package com.project.images;
/***
* DATE: 2008-03-05
* VER: 8.0
**/
import java.io.*;
import java.util.*;
import javax.imageio.*;
import java.awt.*;
import java.awt.image.*;
public class CreateImage {
/**
* DATE: 2008-03-05
* VER: 8.0
**/
public CreateImage() {
}
/**
private char mapTable[]={
"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","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",
"u65FA","u65FA",
"u96C6","u56E2",
"u603B","u90E8",
"u738B","u7EF4",
"u9AD8","u7EA7",
"u4E8B","u52A1",
"u5458","u53CD",
"u4E00","u4E0B",
"u8DEF","u53F7",
"!","@","#","$","%","+",
"_","-","(",")","`","u4E0A",
"u6D77","u5E02","u7EA2",
"u677E","u4E1C"};
**/
/**
* DATE: 2008-03-05
* VER: 8.0
**/
private char mapTable[]={
"u738B","u7EF4"};
public String getEnsure(int width, int height, OutputStream os) {
if(width<=0)width=80;
if(height<=0)height=40;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.setColor(new Color(0xEDFDDD));
g.fillRect(0, 0, width, height);
g.setColor(Color.BLACK);
g.drawRect(0,0,width-1,height-1);
String strEnsure = "";
for(int i=0; i<4; ++i) {
strEnsure += mapTable[(int)(mapTable.length*Math.random())];
}
g.setColor(Color.black);
g.setFont(new Font("Atlantic Inline",Font.PLAIN,24));
String str = strEnsure.substring(0,1);
g.drawString(str,8,20);
str = strEnsure.substring(1,2);
g.drawString(str,20,21);
str = strEnsure.substring(2,3);
g.drawString(str,35,18);
str = strEnsure.substring(3,4);
g.drawString(str,47,20);
g.setColor(Color.red);
Random rand = new Random();
for (int i=0;i<100;i++)
{
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawOval(x,y,1,1);
}
g.dispose();
try {
ImageIO.write(image, "JPEG", os);
} catch (IOException e) {
return "";
}
return strEnsure;
}
/**
* DATE: 2008-03-05
* VER: 8.0
**/
//testing img in localhost
public static void main(String []args) {
try{
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream("c:\bufferd.jpg"));
new CreateImage().getEnsure(80, 100, os);
os.flush();
os.close();
} catch(Exception e) {}
}
}
max笔记-
<script>
function img(){
var img = "img";
var now = Math.floor(Math.random()*9+1);
for(i=1;i<5;i++){
img = img+i;
while(true){
src= document.getElementById(img).src;
src=src+i;
if(src.indexOf(now)<0){
now = Math.floor(Math.random()*9+1);
document.getElementById(img).src = now+".jpg";
break;
}
if(src.indexOf(now)>0){
now = Math.floor(Math.random()*9+1);
}
}
img = "img";
}
}
function setimg(){
var now = Math.floor(Math.random()*9+1);
var img = "img";
for(var i=1;i<5;i++){
img = img+i;
document.getElementById(img).src= now+".jpg";
now = Math.floor(Math.random()*9+1);
img = "img";
}
}
function check(){
if(document.getElementById("t1").value==""){
document.getElementById("d1").innerText="不能为空";
}
else{
var img = "img";
var s = "img4";
var src,str="";
for(var i = 1;i<5;i++){
img = img+i;
src = document.getElementById(img).src;
img = "img";
src = src.substring(102,103);
str = str+src;
}
//ss = s.substring(1.1);
// alert(str);
if(str==document.getElementById("t1").value){
document.getElementById("d1").innerText="验证码正确";
}
else{
document.getElementById("d1").innerText="验证码不正确";
}
}
}
</script>
<body onload="setimg()">
<input type="button" value="看不清点我" onclick="img()">
<img id="img1"></img>
<img id = "img2"></img>
<img id = "img3"></img>
<img id = "img4"></img></br></br></br></br>
<div id="d1" style="font-size:30px;color=red"></div>
填写验证码<input type="text" id="t1">
<input type="button" value="确定验证码" onclick="check()">
</body>
wio-
用于验证码？这个有很多现成的程序，所有下就好!