使用DispatchAction做一个简单的计算器
DispatchAction是Struts中Action中的一种,为一种动态Action,可以处理相同类型的方法
1.calculator.jsp(计算页面)
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- <%@ page language="java" pageEncoding="GB18030"%>
-
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <title>calculator.jsp</title>
- <mce:script type="text/javascript"><!--
- function fun(obj)
- {
- var element=document.getElementById("method");
- element.value=obj;
- alert(element.value);
- form1.submit();
- }
-
-
- </head>
-
- <body>
- <center>
- <form action="calculator.do" method="get" id="form1">
- <input type="text" name="num1"/><br>
- <input type="text" name="num2"/><br>
- <input type="hidden" id="method" name="method">
- <input type="button" name="add" value="加" onclick="fun('add')">
- <input type="button" name="sub" value="减" onclick="fun('sub')">
- <input type="button" name="mul" value="乘" onclick="fun('mul')">
- <input type="button" name="div" value="除" onclick="fun('div')">
- </form>
- </center>
- </body>
- </html>
<%@ page language="java" pageEncoding="GB18030"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>calculator.jsp</title> <mce:script type="text/javascript"><!-- function fun(obj) { var element=document.getElementById("method"); element.value=obj; alert(element.value); form1.submit(); } // --></mce:script> </head> <body> <center> <form action="calculator.do" method="get" id="form1"> <input type="text" name="num1"/><br> <input type="text" name="num2"/><br> <input type="hidden" id="method" name="method"> <input type="button" name="add" value="加" onclick="fun('add')"> <input type="button" name="sub" value="减" onclick="fun('sub')"> <input type="button" name="mul" value="乘" onclick="fun('mul')"> <input type="button" name="div" value="除" onclick="fun('div')"> </form> </center> </body> </html>
2.CalculatorForm(传参,验证ActionFrom)
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- package com.feng.struts.form;
-
- import javax.servlet.http.HttpServletRequest;
- import org.apache.struts.action.ActionErrors;
- import org.apache.struts.action.ActionForm;
- import org.apache.struts.action.ActionMapping;
- import org.apache.struts.action.ActionMessage;
-
- public class CalculatorForm extends ActionForm {
- private double num1;
- private double num2;
- private double result;
-
- public double getNum1() {
- return num1;
- }
-
- public void setNum1(double num1) {
- this.num1 = num1;
- }
-
- public double getNum2() {
- return num2;
- }
-
- public void setNum2(double num2) {
- this.num2 = num2;
- }
-
- public double getResult() {
- return result;
- }
-
- public void setResult(double result) {
- this.result = result;
- }
-
- public ActionErrors validate(ActionMapping mapping,
- HttpServletRequest request) {
- ActionErrors errors = new ActionErrors();
- if ("".equals(num1) || "".equals(num2)) {
- errors.add("num.null", new ActionMessage("num.num"));
- }
- return errors;
- }
-
- public void reset(ActionMapping mapping, HttpServletRequest request) {
-
- }
- }
package com.feng.struts.form; import javax.servlet.http.HttpServletRequest; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; public class CalculatorForm extends ActionForm { private double num1; private double num2; private double result; public double getNum1() { return num1; } public void setNum1(double num1) { this.num1 = num1; } public double getNum2() { return num2; } public void setNum2(double num2) { this.num2 = num2; } public double getResult() { return result; } public void setResult(double result) { this.result = result; } public ActionErrors validate(ActionMapping mapping, HttpServletRequest request) { ActionErrors errors = new ActionErrors(); if ("".equals(num1) || "".equals(num2)) { errors.add("num.null", new ActionMessage("num.num")); } return errors; } public void reset(ActionMapping mapping, HttpServletRequest request) { // TODO Auto-generated method stub } }
3.CalculatorAction(处理类DispatchAction)
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- package com.feng.struts.action;
-
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
-
- import org.apache.struts.action.ActionErrors;
- import org.apache.struts.action.ActionForm;
- import org.apache.struts.action.ActionForward;
- import org.apache.struts.action.ActionMapping;
- import org.apache.struts.action.ActionMessage;
- import org.apache.struts.action.ActionMessages;
- import org.apache.struts.actions.DispatchAction;
-
- import com.feng.struts.form.CalculatorForm;
-
- public class CalculatorAction extends DispatchAction {
-
- public ActionForward add(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response) {
- CalculatorForm calculatorForm = (CalculatorForm) form;
- calculatorForm.setResult(calculatorForm.getNum1()
- + calculatorForm.getNum2());
- return mapping.findForward("ok");
- }
-
- public ActionForward sub(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response) {
- CalculatorForm calculatorForm = (CalculatorForm) form;
- calculatorForm.setResult(calculatorForm.getNum1()
- - calculatorForm.getNum2());
- return mapping.findForward("ok");
- }
-
- public ActionForward mul(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response) {
- CalculatorForm calculatorForm = (CalculatorForm) form;
- calculatorForm.setResult(calculatorForm.getNum1()
- * calculatorForm.getNum2());
- return mapping.findForward("ok");
- }
-
- public ActionForward div(ActionMapping mapping, ActionForm form,
- HttpServletRequest request, HttpServletResponse response) {
- CalculatorForm calculatorForm = (CalculatorForm) form;
- if (calculatorForm.getNum2() == 0) {
- ActionErrors errors=new ActionErrors();
-
-
- ActionMessages message=new ActionMessages();
- message.add("d", new ActionMessage("num.zero"));
- super.saveErrors(request, message);
- return mapping.findForward("no");
- } else {
- calculatorForm.setResult(calculatorForm.getNum1()
- / calculatorForm.getNum2());
- return mapping.findForward("ok");
- }
- }
- }
package com.feng.struts.action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; import org.apache.struts.action.ActionMessages; import org.apache.struts.actions.DispatchAction; import com.feng.struts.form.CalculatorForm; public class CalculatorAction extends DispatchAction { public ActionForward add(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { CalculatorForm calculatorForm = (CalculatorForm) form; calculatorForm.setResult(calculatorForm.getNum1() + calculatorForm.getNum2()); return mapping.findForward("ok"); } public ActionForward sub(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { CalculatorForm calculatorForm = (CalculatorForm) form; calculatorForm.setResult(calculatorForm.getNum1() - calculatorForm.getNum2()); return mapping.findForward("ok"); } public ActionForward mul(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { CalculatorForm calculatorForm = (CalculatorForm) form; calculatorForm.setResult(calculatorForm.getNum1() * calculatorForm.getNum2()); return mapping.findForward("ok"); } public ActionForward div(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { CalculatorForm calculatorForm = (CalculatorForm) form; if (calculatorForm.getNum2() == 0) { ActionErrors errors=new ActionErrors(); // errors.add("num", new ActionMessage("num.zero")); // super.saveErrors(request, errors); ActionMessages message=new ActionMessages(); message.add("d", new ActionMessage("num.zero")); super.saveErrors(request, message); return mapping.findForward("no"); } else { calculatorForm.setResult(calculatorForm.getNum1() / calculatorForm.getNum2()); return mapping.findForward("ok"); } } }
4.ApplicationResources.properties(资源文件,显示错误信息)
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- num.null=/u6570/u5B57/u4E0D/u80FD/u4E3A/u7A7A/!/!/!
- num.zero=/u6570/u5B57/u4E0D/u80FD/u4E3A/u96F6/!/!/!
num.null=/u6570/u5B57/u4E0D/u80FD/u4E3A/u7A7A/!/!/! num.zero=/u6570/u5B57/u4E0D/u80FD/u4E3A/u96F6/!/!/!
5.struts-config.xml(配置文件)
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- <?xml version="1.0" encoding="UTF-8"?>
- <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">
-
- <struts-config>
- <data-sources />
- <form-beans >
- <form-bean name="calculatorForm" type="com.feng.struts.form.CalculatorForm" />
-
- </form-beans>
-
- <global-exceptions />
- <global-forwards />
- <action-mappings >
- <action
- attribute="calculatorForm"
- input="/form/calculator.jsp"
- name="calculatorForm"
- parameter="method"
- path="/calculator"
- scope="request"
- type="com.feng.struts.action.CalculatorAction" >
- <forward name="ok" path="/result.jsp"></forward>
- <forward name="no" path="/error.jsp"></forward>
- </action>
-
- </action-mappings>
-
- <message-resources parameter="com.feng.struts.ApplicationResources" />
- </struts-config>