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检查字符串是否包含数字

發布時間：2025/3/20 编程问答 16 豆豆

生活随笔收集整理的這篇文章主要介紹了检查字符串是否包含数字小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

創建JavaBean類

public class StringUtil3 {private String str; //要檢查的字符串private boolean hasNum; //是否包含數字private String othersStr; //去掉數字后的字符串public String getOthersStr() {return othersStr;}public void setOthersStr(String othersStr) {this.othersStr = othersStr;}public String getStr() {return str;}public void setStr(String str) {this.str = str;}public boolean isHasNum() {char cArr[] = str.toCharArray();//將字符串轉換為字符數組StringBuffer sbNum =new StringBuffer("");StringBuffer sbOthers =new StringBuffer("");for(int i=0;i<cArr.length;i++){//調用String類的hashCode()方法也能獲得字符的ASCII碼//int ascii = String.valueOf(cArr[i]).hashCode();int ascii = (int)cArr[i];//強制轉換可以直接得到字符的ASCII碼//數字的 ASCII碼范圍在48-57之間if(ascii>=48&&ascii<=57){sbNum.append(cArr[i]);//將每個數字添加到StringBuffer對象中}else{sbOthers.append(cArr[i]);}}this.setOthersStr(sbOthers.toString());if(!sbNum.toString().equals(""))hasNum=true;elsehasNum=false;return hasNum;}public void setHasNum(boolean hasNum) {this.hasNum = hasNum;} }

創建index.jsp頁面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><title>判斷字符串是否包含數字</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"><style type="text/css">table{border: 1px solid;border-color: green;font-family:華文細黑;font-size: 13px;color:gray;}input{font-family:華文細黑;font-size: 13px;color:gray;}</style></head><body><form action="check3.jsp" method="post"><table><tr><td align="right">請輸入字符串：</td><td><input type="text" name="str" size="30"/></td></tr> <tr><td colspan="2" align="center"><input type="submit" value="檢查" /></td></tr></table> </form></body> </html>

創建check.jsp頁面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%request.setCharacterEncoding("UTF-8");%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head> <title>檢查</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"><style type="text/css">table{border: 1px solid;border-color: green;color: green;font-size: 13px;font-family: 華文細黑;}</style></head><body><%String str = request.getParameter("str");%><jsp:useBean id="strBean" class="com.cn.zj.bean.StringUtil3"></jsp:useBean><jsp:setProperty property="str" name="strBean" value="<%=str %>"/><table><tr><td align="right">輸入的字符串：</td><td> <jsp:getProperty property="str" name="strBean"/></td></tr><tr><td align="right">是否包含數字：</td><td>  <jsp:getProperty property="hasNum" name="strBean"/></td> </tr><tr><td align="right">去掉數字后的字符串：</td><td>  <jsp:getProperty property="othersStr" name="strBean"/></td></tr></table> </body> </html>

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编程问答

检查字符串是否包含数字

總結