/day32/WebRoot/calculator.jsp
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s" %> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <script type="text/javascript" src="js/jquery-1.8.2.js"></script> <script type="text/javascript"> $(function(){ $("form").submit(function(){ var flag = false; if(validateNum1() && validateNum2()){ flag = true; } return flag; }); }); function validateNum1(){ var flag = false; var num1 = $(":text:first").val(); num1 = $.trim(num1); if(num1!=null && num1.length>0){ flag = true; }else{ alert("操作数一必填"); $(":text:first").focus(); } return flag; } function validateNum2(){ var flag = false; var num2 = $(":text:last").val(); num2 = $.trim(num2); if(num2!=null && num2.length>0){ flag = true; }else{ alert("操作数二必填"); $(":text:last").focus(); } return flag; } </script> </head> <body> <form action="/day32/calculator" method="post"> <table border="2" align="center"> <caption><h3>四则运算</h3></caption> <tr> <th>第一个操作数</th> <td><input type="text" name="num1" maxlength="4" value="${requestScope.num1}"/></td> <td> <s:fielderror fieldName="num1"/> </td> </tr> <tr> <th>操作符</th> <td> <select name="opt"> <option value="+" ${requestScope.opt=='+'?'selected':''}>+</option> <option value="-" ${requestScope.opt=='-'?'selected':''}>-</option> <option value="*" ${requestScope.opt=='*'?'selected':''}>*</option> <option value="/" ${requestScope.opt=='/'?'selected':''}>/</option> </select> </td> </tr> <tr> <th>第二个操作数</th> <td><input type="text" name="num2" maxlength="4" value="${requestScope.num2}"/></td> <td> <s:fielderror fieldName="num2"/> </td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="计算"/> </td> </tr> </table> </form> <hr/> <c:if test="${requestScope.flag=='showResult'}"> ${requestScope.num1} ${requestScope.opt} ${requestScope.num2} ${requestScope.equ} ${requestScope.result}<br/> </c:if> ${requestScope.message} </body> </html>
/day32/src/cn/itcast/web/struts2/work/CalculatorAction.java
package cn.itcast.web.struts2.work; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; //计算 public class CalculatorAction extends ActionSupport{ private Integer num1;//操作数一 private String opt;//操作符 private Integer num2;//操作数二 public Integer getNum1() { return num1; } public void setNum1(Integer num1) { this.num1 = num1; } public String getOpt() { return opt; } public void setOpt(String opt) { this.opt = opt; } public Integer getNum2() { return num2; } public void setNum2(Integer num2) { this.num2 = num2; } public void validateExecute() { String strNum1 = this.num1+""; String strNum2 = this.num2+""; if(strNum1!=null && strNum1.trim().length()>0){ //只能输入1位到4位的数字，包括1位和4位 if(strNum1.matches("^[0-9]{1,4}$")){ ; }else{ this.addFieldError("num1","操作数一必须是四位数字"); } }else{ this.addFieldError("num1","操作数一必填"); } if(strNum2!=null && strNum2.trim().length()>0){ if(strNum2.matches("^[0-9]{1,4}$")){ ; }else{ this.addFieldError("num2","操作数一必须是四位数字"); } }else{ this.addFieldError("num2","操作数一必填"); } } public String execute() throws Exception { ActionContext.getContext().put("flag","showResult"); if(this.opt.equals("+")){ this.result = this.num1 + this.num2; }else if(this.opt.equals("-")){ this.result = this.num1 - this.num2; }else if(this.opt.equals("*")){ this.result = this.num1 * this.num2; }else if(this.opt.equals("/")){ if(this.num2!=0){ this.result = this.num1 / this.num2; }else{ ActionContext.getContext().put("message","除数不能为0"); } } return this.SUCCESS; } private Integer result;//结果 private String equ = "=";//等号 public Integer getResult() { return result; } public String getEqu() { return equ; } }
/day32/src/cn/itcast/web/struts2/work/struts_work.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="workPackage" extends="struts-default" namespace="/"> <action name="calculator" class="cn.itcast.web.struts2.work.CalculatorAction" method="execute"> <result name="success" type="dispatcher"> /calculator.jsp </result> <result name="input" type="dispatcher"> /calculator.jsp </result> </action> </package> </struts>