这个jsp是产生随机六位数的，请问错在哪里呢

Question

<%@ page contentType="text/html charset=gb2312" %>
<%@ page import="java.util.*,java.awt.*"%><%String   s="";   
  String   arrykey[]={"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"};     
    Random   x=new   Random();   
    
        for(int   i=1;i<=6;i++){   
            String   temp=null;   
            int   tempnum=x.nextInt(35);   
            temp=arrykey[tempnum];             
            s=s+temp;   
          }   
        System.out.println(s); 
%>

Answer 1

这是我产生8位随机密码的例子:
//重置密码
String pwd="";
for(int j=0;j<8;j++){
   int number = random.nextInt(10);
     pwd = pwd.concat(new Integer(number).toString());
}

Answer 2

<%@ page contentType="image/jpeg"%>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
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);
}
%>
<%
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
int width=70, 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);
}

String sRand="";
for (int i=0;i<5;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);

g.dispose();

ImageIO.write(image, "JPEG", response.getOutputStream());
%>

Answer 3

这是个JSP页面，到要用它的页面用iframe把它给引入进来。

Answer 4

String   temp=null;   
  这句错了哦

Answer 5

String   temp=null;   应该放在循环外面
要不然每次他都会让temp=null 
上次的值就没了

Answer 6

String   temp=null;   应该放在循环外面
要不然每次他都会让temp=null 
上次的值就没了
----
正解 我没啥说的啦.