寫一個struts2入門的程式，從早上七點多，一直有錯。action的代碼如下：
}package cn.edu.qust.struts.action;<br />import com.opensymphony.xwork2.ActionSupport;<br />public class FirstAction extends ActionSupport{<br />private int operand1;<br />private int operand2;<br />private int sum = 0;<br />public int getOperand1() {<br />return operand1;<br />}<br />public void setOperand1(int operand1) {<br />System.out.println(operand1);<br />this.operand1 = operand1;<br />}<br />public int getOperand2() {<br />return operand2;<br />}<br />public void setOperand2(int operand2) {<br />System.out.println(operand2);<br />this.operand2 = operand2;<br />}<br />public int getSum() {<br />System.out.println(sum);<br />sum = operand1 + operand2;<br />System.out.println(sum);<br />return sum;<br />}<br />public String execute() throws Exception {<br />if (getSum() >= 0) {<br />return "success";<br />} else {<br />return "failure";<br />}<br />}<br />}<br />
struts的配置如下：
<?xml version="1.0" encoding="UTF-8" ?><br /><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><br /><struts><br /><package name="struts2" extends="struts-default"><br /><action name="sum" class="cn.edu.qust.struts.action.FirstAction"><br /><result name="success">/positive.jsp</result><br /><result name="failure">/negative.jsp</result><br /></action><br /></package><br /></struts><br />
web.xml代碼如下：
<?xml version="1.0" encoding="UTF-8"?><br /><web-app version="2.5"<br />xmlns="http://java.sun.com/xml/ns/javaee"<br />xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"<br />xsi:schemaLocation="http://java.sun.com/xml/ns/javaee<br />http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><br /> <filter><br /> <filter-name>struts2</filter-name><br /> <filter-class><br /> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter<br /> </filter-class><br /> </filter><br /> <filter-mapping><br /> <filter-name>struts2</filter-name><br /> <url-pattern>/*</url-pattern><br /> </filter-mapping></web-app><br />
sum.jsp代碼如下：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>輸入運算元</title>
</head>
<body>
This is my JSP page. <br>
求代數和
<br/>
<s:form action="sum">
<s:textfield name="operand1"label="運算元1"></s:textfield>
<s:textfield name="operand2" label="運算元2"></s:textfield>
<s:submit value="代數和"/>
</s:form>
</body>
</html>
還有positive.jsp和negative.jsp。
在sum.jsp的介面中輸入12和1進入positive.jsp的介面，然而奇妙的事情發生了輸入-12和1也是進入positive.jsp產生的介面。這就讓人鬱悶了。
就在剛剛的15:10:47 。看到代碼public class FirstAction extends ActionSupport上有自動提示的警告，根據自動提示加上了@SuppressWarnings("serial")。然後重新發布，竟然成功了！
覺得可能是自動添加的代碼的關係，就把自動添加的代碼去掉了，重新試了試。竟然也是成果的。這就讓人鬱悶了。不過既然代碼現在沒有錯了。我也困了，去睡覺了，問題先寫在這，以後想起來在研究之。
插下時間15:17:08
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