验证码过期(小功能)

作用：模拟获取验证码，10s后，重新获取。未过期前不可重复获取；

 

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
		//获取随机短信  --不使用了
		Random r = new Random();
		StringBuilder sb =  new StringBuilder();
		for(int i=0;i<=5;i++){
		int s = r.nextInt(10);
		sb.append(s);
		}
	
 %>



  
    
	
	
	
	
  
  
  
   

   

   
短信验证码 倒计时重新获取

   短信验证码： 
   
   

   

   
   

   
   
    
  

后台随机产生验证码：

 

 

public class SmsService extends HttpServlet {

	private static final long serialVersionUID = 5846536395092919495L;

	@Override
	public void doPost(HttpServletRequest request,HttpServletResponse response)
								throws ServletException, IOException{
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		String param = request.getParameter("method");
		System.out.println("================");
		System.out.println("param="+param);
		System.out.println("================");
		Random r = new Random();
		StringBuilder sb =  new StringBuilder();
		for(int i=0;i<=5;i++){
		int s = r.nextInt(10);
		sb.append(s);
		}
		System.out.println("短信验证码 ："+sb);
		PrintWriter pw = response.getWriter();
		pw.write(sb.toString());
		pw.flush();
		pw.close();
		
	}

}

效果示意--

 

 

 

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