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Stuts2 使用DispatchAction做一个简单的计算器

 
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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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  1. <%@pagelanguage="java"pageEncoding="GB18030"%>
  3. <!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
  4. <html>
  5. <head>
  6. <title>calculator.jsp</title>
  7. <mce:scripttype="text/javascript"><!--
  8. functionfun(obj)
  9. {
  10. varelement=document.getElementById("method");
  11. element.value=obj;
  12. alert(element.value);
  13. form1.submit();
  14. }
  16. //--></mce:script>
  17. </head>
  19. <body>
  20. <center>
  21. <formaction="calculator.do"method="get"id="form1">
  22. <inputtype="text"name="num1"/><br>
  23. <inputtype="text"name="num2"/><br>
  24. <inputtype="hidden"id="method"name="method">
  25. <inputtype="button"name="add"value="加"onclick="fun('add')">
  26. <inputtype="button"name="sub"value="减"onclick="fun('sub')">
  27. <inputtype="button"name="mul"value="乘"onclick="fun('mul')">
  28. <inputtype="button"name="div"value="除"onclick="fun('div')">
  29. </form>
  30. </center>
  31. </body>
  32. </html>

2.CalculatorForm(传参，验证ActionFrom)

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  1. packagecom.feng.struts.form;
  3. importjavax.servlet.http.HttpServletRequest;
  4. importorg.apache.struts.action.ActionErrors;
  5. importorg.apache.struts.action.ActionForm;
  6. importorg.apache.struts.action.ActionMapping;
  7. importorg.apache.struts.action.ActionMessage;
  9. publicclassCalculatorFormextendsActionForm{
  10. privatedoublenum1;
  11. privatedoublenum2;
  12. privatedoubleresult;
  14. publicdoublegetNum1(){
  15. returnnum1;
  16. }
  18. publicvoidsetNum1(doublenum1){
  19. this.num1=num1;
  20. }
  22. publicdoublegetNum2(){
  23. returnnum2;
  24. }
  26. publicvoidsetNum2(doublenum2){
  27. this.num2=num2;
  28. }
  30. publicdoublegetResult(){
  31. returnresult;
  32. }
  34. publicvoidsetResult(doubleresult){
  35. this.result=result;
  36. }
  38. publicActionErrorsvalidate(ActionMappingmapping,
  39. HttpServletRequestrequest){
  40. ActionErrorserrors=newActionErrors();
  41. if("".equals(num1)||"".equals(num2)){
  42. errors.add("num.null",newActionMessage("num.num"));
  43. }
  44. returnerrors;
  45. }
  47. publicvoidreset(ActionMappingmapping,HttpServletRequestrequest){
  48. //TODOAuto-generatedmethodstub
  49. }
  50. }

3.CalculatorAction(处理类DispatchAction)

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  1. packagecom.feng.struts.action;
  3. importjavax.servlet.http.HttpServletRequest;
  4. importjavax.servlet.http.HttpServletResponse;
  6. importorg.apache.struts.action.ActionErrors;
  7. importorg.apache.struts.action.ActionForm;
  8. importorg.apache.struts.action.ActionForward;
  9. importorg.apache.struts.action.ActionMapping;
  10. importorg.apache.struts.action.ActionMessage;
  11. importorg.apache.struts.action.ActionMessages;
  12. importorg.apache.struts.actions.DispatchAction;
  14. importcom.feng.struts.form.CalculatorForm;
  16. publicclassCalculatorActionextendsDispatchAction{
  18. publicActionForwardadd(ActionMappingmapping,ActionFormform,
  19. HttpServletRequestrequest,HttpServletResponseresponse){
  20. CalculatorFormcalculatorForm=(CalculatorForm)form;
  21. calculatorForm.setResult(calculatorForm.getNum1()
  22. +calculatorForm.getNum2());
  23. returnmapping.findForward("ok");
  24. }
  26. publicActionForwardsub(ActionMappingmapping,ActionFormform,
  27. HttpServletRequestrequest,HttpServletResponseresponse){
  28. CalculatorFormcalculatorForm=(CalculatorForm)form;
  29. calculatorForm.setResult(calculatorForm.getNum1()
  30. -calculatorForm.getNum2());
  31. returnmapping.findForward("ok");
  32. }
  34. publicActionForwardmul(ActionMappingmapping,ActionFormform,
  35. HttpServletRequestrequest,HttpServletResponseresponse){
  36. CalculatorFormcalculatorForm=(CalculatorForm)form;
  37. calculatorForm.setResult(calculatorForm.getNum1()
  38. *calculatorForm.getNum2());
  39. returnmapping.findForward("ok");
  40. }
  42. publicActionForwarddiv(ActionMappingmapping,ActionFormform,
  43. HttpServletRequestrequest,HttpServletResponseresponse){
  44. CalculatorFormcalculatorForm=(CalculatorForm)form;
  45. if(calculatorForm.getNum2()==0){
  46. ActionErrorserrors=newActionErrors();
  47. //errors.add("num",newActionMessage("num.zero"));
  48. //super.saveErrors(request,errors);
  49. ActionMessagesmessage=newActionMessages();
  50. message.add("d",newActionMessage("num.zero"));
  51. super.saveErrors(request,message);
  52. returnmapping.findForward("no");
  53. }else{
  54. calculatorForm.setResult(calculatorForm.getNum1()
  55. /calculatorForm.getNum2());
  56. returnmapping.findForward("ok");
  57. }
  58. }
  59. }

4.ApplicationResources.properties(资源文件，显示错误信息)

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  1. num.null=/u6570/u5B57/u4E0D/u80FD/u4E3A/u7A7A/!/!/!
  2. num.zero=/u6570/u5B57/u4E0D/u80FD/u4E3A/u96F6/!/!/!

5.struts-config.xml(配置文件)

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  1. <?xmlversion="1.0"encoding="UTF-8"?>
  2. <!DOCTYPEstruts-configPUBLIC"-//ApacheSoftwareFoundation//DTDStrutsConfiguration1.2//EN""http://struts.apache.org/dtds/struts-config_1_2.dtd">
  4. <struts-config>
  5. <data-sources/>
  6. <form-beans>
  7. <form-beanname="calculatorForm"type="com.feng.struts.form.CalculatorForm"/>
  9. </form-beans>
  11. <global-exceptions/>
  12. <global-forwards/>
  13. <action-mappings>
  14. <action
  15. attribute="calculatorForm"
  16. input="/form/calculator.jsp"
  17. name="calculatorForm"
  18. parameter="method"
  19. path="/calculator"
  20. scope="request"
  21. type="com.feng.struts.action.CalculatorAction">
  22. <forwardname="ok"path="/result.jsp"></forward>
  23. <forwardname="no"path="/error.jsp"></forward>
  24. </action>
  26. </action-mappings>
  28. <message-resourcesparameter="com.feng.struts.ApplicationResources"/>
  29. </struts-config>

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