1. Three files need to be created in this case:
1. Numinput.jsp file: form form submission data page
2. Numshow.jsp file: display accumulated data results
3. Add.java: arithmetic sum of integers with a step of 1
Two, directly on the code
1、Numinput.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>提交整数页面</title>
</head>
<body>
<h2>请按照下列各式提交两个整数</h2>
<br>
<form action="Numshow.jsp" method="post">
开始数据:
<input name="a">
<br>
<br>
结束数据:
<input name="b">
<br>
<br>
<input type="submit" value="提交">
</form>
</body>
</html>
The interface is shown in the figure below:
2、Numshow.jsp
<%@page import="java.util.Date"%>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="com.javabean.*"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>利用Javabean+jsp求两个整数之间的和</title>
</head>
<body>
<%request.setCharacterEncoding("UTF-8") ; %>
<jsp:useBean id="he" class="com.javabean.Add" />
<jsp:setProperty name="he" property="*" />
<p><%=he.getA()%>加到<%=he.getB()%>的和是：<%=he.sum()%></p>
<p>现在的时间是：<%=new Date()%></p>
</body>
</html>
The interface after accumulation and summation is as follows:
3、Add.java
package com.javabean;
public class Add {
private int a;
private int b;
public Add() {
}
public Add(int a, int b) {
super();
this.a = a;
this.b = b;
}
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public int getB() {
return b;
}
public void setB(int b) {
this.b = b;
}
public int sum() {
int c, s = 0;
if (a > b) {
c = a;
a = b;
b = c;
}
int x = a;
while (x <= b) {
s += x;
++x;
}
return s;
}
}
Note:
1. The attribute value <input>in namethe form tag should be the same as that of the Add.java file变量名一致
There are many methods to reference JavaBean, please refer to the link for details: https://blog.csdn.net/a18792721831/article/details/76541292
2. JavaBean design principles:
(1) JavaBean is a公共类
public class Add {
}
(2) JavaBean has a公共的无参的构造方法
public Add() {
}
(3)JavaBean所有的属性 均为 私有
private int a;
private int b;
(4) In JavaBean, two methods need to be provided for each attribute:setXxx()和getXxx()
public int getA() {
return a;
}
public void setA(int a) {
this.a = a;
}
public int getB() {
return b;
}
public void setB(int b) {
this.b = b;
}
(5) When defining a JavaBean, usually put it 命名的包next to the
white one. I hope to help more friends~~~