1.设计Action类。
com.actiom/Addaction.java
[sourcecode language=”java” title=”com.actiom/Addaction.java”]
package com.action;
public class Addaction {
private double x;
private double y;
private double sum;
// 求值Action方法,并返回"-"或“+”
public String CalculateSum() {
String forward = null;
sum = x+y;
if (sum < 0) {
forward = "-";
} else {
forward = "+";
}
return forward;
}
public Addaction() {//必带无参构造方法
}
public Addaction(double x,double y) { //带参数构造方法，但只有两个参数x、y
this.x=x;
this.y=y;
this.sum=x+y;
}
//各属性的getter/setter方法
public double getX() {
return x;
}
public void setX(double x) {
this.x = x;
}
public double getY() {
return y;
}
public void setY(double y) {
this.y = y;
}
public double getSum() {
return sum;
}
public void setSum(double sum) {
this.sum = sum;
}
}[/sourcecode]
2.设计JSP页面。
提交页面。
input.jsp
[sourcecode language=”html” title=”input.jsp”]
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>两数之和计算</title>
</head>
<body>
<form action="opadd" method="post">
<table>
<tr>
<th colspan="2">请输入两个实数：</th>
</tr>
<tr>
<td align="right">加数：</td>
<td><input type="text" name="x" /></td> <%–保持和Action类的属性一致 –%>
</tr>
<tr>
<td align="right">被加数:</td>
<td><input type="text" name="y" /></td>
</tr>
<tr>
<td align="right"><input type="submit" value="求和" /></td>
</tr>
</table>
</form>
</body>
</html>[/sourcecode]
和为正数的页面
negative.jsp
[sourcecode language=”html” title=”negative.jsp”]
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计算结果为负数的页面</title>
</head>
<body>
代数和为负整数,其和值为:${x}+${y}=${sum}
</body>
</html>[/sourcecode]
和为负数的页面。
positive.jsp
[sourcecode language=”html” title=”positive.jsp”]
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>计算结果为大于等于0的页面</title>
</head>
<body>
代数和为非负整数,其和值为:${x}+${y}=${sum}<br>
</body>
</html>[/sourcecode]
3.修改struts.xml文件
struts.xml
[sourcecode language=”xml” title=”struts.xml”]
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="default" namespace="/" extends="struts-default">
<action name="opadd" class="com.action.Addaction" method="CalculateSum">
<result name="+">positive.jsp</result>
<result name="-">/negative.jsp</result>
</action>
</package>
</struts>
[/sourcecode]
效果图：
