求某范围质数 J2EE版及JS版

来源：互联网发布：深圳网络诈骗举报编辑：程序博客网时间：2024/05/19 16:27

一边吃夜宵，一边敲代码

先来个JS版本的

<!DOCTYPE html><html><head><title>查找某范围质数</title><script type="text/javascript">function $ (id) {return document.getElementById(id);}function isPrim (num) {if(num <=1) {return false};if(num ==2) {return true};var top = Math.floor(Math.sqrt(num));    var i;for( i=2;i<=top;i++) {if(num%i == 0) {break ;}}return i == top+1 ;}function findPrim () { beginNum = parseInt($("begin").value);endNum = parseInt($("end").value);// alert(beginNum);// alert(endNum);var result= "" ;var cnt = 0;for(var i = beginNum;i<=endNum;i++) {if(isPrim(i)){result+="<span>"+i+"</span>" ;cnt ++ ;if(cnt%10 ==0){result+="<br/>";}}}alert(result);$("result").innerHTML= result;}// alert(isPrim(100));</script><style type="text/css"> #result span{           width:70px;           color:blue;           text-align: center;           font-weight: bold;           font-size: 20px;           display: inline-block;        }</style></head><body><h3>查找某范围质数</h3><div><span>开始范围：<input type="text" value= "" id= "begin"> </span></div><div><span>结束范围：<input type="text" value= "" id ="end"> </span></div><div><button onclick="findPrim();">点击查找</button></div><div id = "result"></div></body></html>

再来个J2EE版本的

package edu.fjnu.Harry.Prim;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class PrimServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {int beginNum = Integer.parseInt(request.getParameter("beginNum"));int endNum = Integer.parseInt(request.getParameter("endNum"));int cnt = 0 ;for(int i = beginNum ;i<endNum;i++){if(isPrim(i)){System.out.print(" "+i);cnt++; }if(cnt%10 == 0) System.out.println();}request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");}private boolean isPrim(int num){if(num == 1 ) return false ; if(num == 2 ) return true;int i = 2;int top = (int)(Math.floor(Math.sqrt(num)));for(i=2;i<Math.sqrt(num);i++){if(num%i == 0) break;}return i == top+1 ;}}

与上面servlet相对应的jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'isPrim.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  <form action="<c:url value ="/prim"/>"  method="get" >   <div>   <span>请输入起始数字<input type="text" name ="beginNum"></span>   </div>   <div>   <span>请输入结束数字<input type="text" name ="endNum"></span>   </div>   <input type ="submit" value = "查找">   </form>  </body></html>

夜宵吃完了~

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