2017.11.4 JavaWeb-----基于JavaBean+JSP求任意两数代数和(改进的在JSP页面中无JSP脚本代码的)+网页计数器JavaBean的设计与使用

修改后的JSP中不含有JSP脚本代码这使得JSP程序的清晰性、简单

1.设计JavaBean 的Add.java 类

package beans;
public class Add {
	private int shuju1;
	private int shuju2;
	private int sum;
	public Add(){}
	public int getshuju1(){return shuju1;}
	public int getShuju1() {
		return shuju1;
	}
	public void setShuju1(int shuju1) {
		this.shuju1 = shuju1;
	}
	public int getShuju2() {
		return shuju2;
	}
	public void setShuju2(int shuju2) {
		this.shuju2 = shuju2;
	}
	
	public int getSum(){return shuju1+shuju2;}
	public void setSum(int sum){this.sum=sum;}
}

2.用户输入界面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>  
    <title>提交任意两个整数的页面</title>
  </head>
  
  <body>
    <h3>按下列格式要求,输入两个整数:</h3><br>
    	<form action="show.jsp" method="post"></form>
    		加数:<input name="shuju1"><br><br>
    		被加数:<input name="shuju2"><br><br>
    		<input type="submit" value="提交">
  </body>
</html>

3.显示正确的结果界面:

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title>利用JavaBean+JSP求两数和</title>
  <body>
    <jsp:useBean id="c" class="beans.Add" scope="request"/>
    <jsp:setProperty name="c" property="*"/>  /为c对象的属性赋值
    <p>调用jsp:property 做标签显示结果值:<br/>
    	<jsp:getProperty name="c" property="shuju1"/>+ <jsp:getProperty name="c" property="shuju2"/>
    			=<jsp:setProperty name="c" property="sum"/><br>
    </p>
  </body>
</html>

例题:设计一个JavaBean记载网页的访问量,在动态页面访问该JavaBean,实现网页计数。假如要统计两个网页的总共访问量.

1.//编写JavaBean类,计数器 Counter.java

package beans;
public class Counter {
	private int count;
	public Counter()
	{
		count=0;
		}
	public int getCount() 
	{
		count++;
		return count;
	}
	public void setCount(int count)
	{
		this.count = count;
	}
}

2.//第一个页面 counter1.jsp

<%@ page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <title>网页访问数量</title>
  </head>
  
  <body>
    <jsp:useBean id="counter" class="beans.Counter" scope="application"/>
    这次访问的是第一个页面:counter1.jsp!<br/>
    两页面共被访问次数:
    <jsp:getProperty name="counter" property="count"/>
  </body>
</html>

3.//第二个页面 counter2.jsp

<%@ page contentType="text/html"  pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>网页访问数量</title>
  </head>
  <body>
    <jsp:useBean id="counter" class="beans.Counter" scope="application"/>
    这次访问的是第2个页面!<br>
   两页面共被访问次数:
   <jsp:getProperty name="counter" property="count"/> 
  </body>
</html>
posted @ 2017-11-04 16:42  LegendQi  阅读(516)  评论(0编辑  收藏  举报