jsp实现三��联动的下拉列表框效果

flustar — Wed, 20 Dec 2006 07:06:00 GMT

<%@ page language="java" contentType="image/jpeg"
pageEncoding="gb2312"%>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"%>

<%!
Color getRandColor(int fc,int bc){
Random rand=new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int r=fc+rand.nextInt(bc-fc);
int g=fc+rand.nextInt(bc-fc);
int b=fc+rand.nextInt(bc-fc);
return new Color(r,g,b);
}
%>
<%
//讄��面不缓�?br /> response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);

//在内存中创徏囑փ�
int width=60,height=20;
BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);

//获取囑փ�
Graphics g=image.getGraphics();
//生成随机�c?br /> Random rand=new Random();
//讑֮�背景颜色
g.setColor(getRandColor(200,250));
g.fillRect(0,0,width,height);
//讑֮�字体
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
//随机产生155条干扰线�Q��图象中的认证码不易被其它�E�序探测�?br /> g.setColor(getRandColor(160,200));
for(int i=0;i<155;i++){
int x=rand.nextInt(width);
int y=rand.nextInt(height);
int x1=rand.nextInt(12);
int y1=rand.nextInt(12);
g.drawLine(x,y,x+x1,y+y1);

}
//取随��Z�生的4位验证码
String sRand="";
for(int i=0;i<4;i++){
String strRand=String.valueOf(rand.nextInt(10));
sRand+=strRand;
//��验证码昄��到图像中
g.setColor(new Color(20+rand.nextInt(110),20+rand.nextInt(110),20+rand.nextInt(110)));
g.drawString(strRand,13*i+6,16);

}
//��验证码攑օ�session
session.setAttribute("rand",sRand);

g.dispose();
//输出图象到页�?br /> ImageIO.write(image, "JPEG", response.getOutputStream());

flustar 2006-12-20 15:06 发表评论

flustar — Wed, 20 Dec 2006 07:03:00 GMT

一、在数据库数据库中徏立三个表
1.city
字段�Q?br />districtname�Q�locationid�Q�districtid
2.province
字段�Q?br />locationid�Q�locationname
3.village
字段�Q?br />villageid,villagename,districtid
二、代码如下：
<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<%@ page import="java.sql.* "%>

jsp实现三��联动的下拉列表框效果
<%
   Connection conn=null;
   Statement stmt=null;
   ResultSet rs=null,rs1=null,rs2=null;
   String sql;
   int count;
   int count2;
   String drivername="com.microsoft.jdbc.sqlserver.SQLServerDriver";
   String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=SJLD";
   try{
    Class.forName(drivername);
    conn=DriverManager.getConnection(url,"sa","");
    stmt=conn.createStatement�Q�）;
    sql="select * from city order by locationid asc";
    rs=stmt.executeQuery(sql);
   }catch(SQLException e){
    System.out.println(e.getMessage());
   }

%>

<%
sql="select * from village order by districtid asc";
rs2=stmt.executeQuery(sql);
%>

flustar 2006-12-20 15:03 发表评论

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