莫名其妙的java struts2

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莫名其妙的java struts2

写一个struts2入门的程序，从早上七点多，一直有错。action的代码如下：

}package cn.edu.qust.struts.action; import com.opensymphony.xwork2.ActionSupport; public class FirstAction extends ActionSupport{ private int operand1; private int operand2; private int sum = 0; public int getOperand1() { return operand1; } public void setOperand1(int operand1) { System.out.println(operand1); this.operand1 = operand1; } public int getOperand2() { return operand2; } public void setOperand2(int operand2) { System.out.println(operand2); this.operand2 = operand2; } public int getSum() { System.out.println(sum); sum = operand1 + operand2; System.out.println(sum); return sum; } public String execute() throws Exception { if (getSum() >= 0) { return "success"; } else { return "failure"; } } }

struts的配置如下：

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <package name="struts2" extends="struts-default"> <action name="sum" class="cn.edu.qust.struts.action.FirstAction"> <result name="success">/positive.jsp</result> <result name="failure">/negative.jsp</result> </action> </package> </struts>

web.xml代码如下：

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>

sum.jsp代码如下：

<%@ 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>输入操作数</title>

    </head>

<body>
    This is my JSP page. <br>
    求代数和
    <br/>
    <s:form action="sum">
    <s:textfield name="operand1"label="操作数1"></s:textfield>
    <s:textfield name="operand2" label="操作数2"></s:textfield>
    <s:submit value="代数和"/>
    </s:form>
</body>
</html>

还有positive.jsp和negative.jsp。

在sum.jsp的界面中输入12和1进入positive.jsp的界面，然而奇妙的事情发生了输入-12和1也是进入positive.jsp生成的界面。这就让人郁闷了。

就在刚刚的15:10:47 。看到代码public class FirstAction extends ActionSupport上有自动提示的警告，根据自动提示加上了@SuppressWarnings("serial")。然后重新发布，竟然成功了！

觉得可能是自动添加的代码的关系，就把自动添加的代码去掉了，重新试了试。竟然也是成果的。这就让人郁闷了。不过既然代码现在没有错了。我也困了，去睡觉了，问题先写在这，以后想起来在研究之。

插下时间15:17:08

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原文地址：https://www.cnblogs.com/lawdong/p/2357902.html