用javabean制作一个页面,页面的背景颜色以及文字的大小、字体和颜色可以根据用户的选择来实施。代码实现
时间: 2024-03-14 16:45:35 浏览: 19
好的,下面是用javabean制作一个页面,页面的背景颜色以及文字的大小、字体和颜色可以根据用户的选择来实施的代码实现:
1. 创建一个JavaBean类,名为PageProperties,用于设置页面的属性。代码如下:
```java
public class PageProperties {
private String bgColor;
private String fontColor;
private String fontFamily;
private int fontSize;
public String getBgColor() {
return bgColor;
}
public void setBgColor(String bgColor) {
this.bgColor = bgColor;
}
public String getFontColor() {
return fontColor;
}
public void setFontColor(String fontColor) {
this.fontColor = fontColor;
}
public String getFontFamily() {
return fontFamily;
}
public void setFontFamily(String fontFamily) {
this.fontFamily = fontFamily;
}
public int getFontSize() {
return fontSize;
}
public void setFontSize(int fontSize) {
this.fontSize = fontSize;
}
}
```
2. 创建一个JSP页面,名为index.jsp,用于展示用户选择的页面。代码如下:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="bean" uri="/WEB-INF/tags/pageProperties.tld" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Page Properties Example</title>
<style>
body {
background-color: ${pageProperties:bgColor};
font-size: ${pageProperties:fontSize}px;
font-family: ${pageProperties:fontFamily};
color: ${pageProperties:fontColor};
}
</style>
</head>
<body>
<h1>Page Properties Example</h1>
<p>This is a sample text.</p>
<form method="post" onsubmit="updatePageProperties(); return false;">
<label for="bgColor">Background Color:</label>
<select name="bgColor" id="bgColor">
<option value="white">White</option>
<option value="red">Red</option>
<option value="green">Green</option>
<option value="blue">Blue</option>
</select>
<br>
<label for="fontColor">Font Color:</label>
<select name="fontColor" id="fontColor">
<option value="black">Black</option>
<option value="white">White</option>
<option value="red">Red</option>
<option value="green">Green</option>
<option value="blue">Blue</option>
</select>
<br>
<label for="fontFamily">Font Family:</label>
<select name="fontFamily" id="fontFamily">
<option value="Arial">Arial</option>
<option value="Times New Roman">Times New Roman</option>
<option value="Verdana">Verdana</option>
<option value="Courier New">Courier New</option>
</select>
<br>
<label for="fontSize">Font Size:</label>
<select name="fontSize" id="fontSize">
<option value="12">12</option>
<option value="14">14</option>
<option value="16">16</option>
<option value="18">18</option>
</select>
<br>
<input type="submit" value="Apply Changes">
</form>
<script>
function updatePageProperties() {
var form = document.forms[0];
var bgColor = form.elements['bgColor'].value;
var fontColor = form.elements['fontColor'].value;
var fontFamily = form.elements['fontFamily'].value;
var fontSize = form.elements['fontSize'].value;
var data = 'bgColor=' + bgColor + '&fontColor=' + fontColor
+ '&fontFamily=' + fontFamily + '&fontSize=' + fontSize;
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
window.location.reload();
}
};
xhttp.open("POST", "update.jsp", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send(data);
}
</script>
</body>
</html>
```
3. 创建一个JSP页面,名为update.jsp,用于更新用户选择的页面属性,并重定向到index.jsp页面。代码如下:
```jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ page import="javax.servlet.http.*" %>
<jsp:useBean id="pageProperties" class="PageProperties" scope="session" />
<%
String bgColor = request.getParameter("bgColor");
String fontColor = request.getParameter("fontColor");
String fontFamily = request.getParameter("fontFamily");
int fontSize = Integer.parseInt(request.getParameter("fontSize"));
pageProperties.setBgColor(bgColor);
pageProperties.setFontColor(fontColor);
pageProperties.setFontFamily(fontFamily);
pageProperties.setFontSize(fontSize);
response.sendRedirect("index.jsp");
%>
```
4. 创建一个标签库文件,名为pageProperties.tld,用于定义自定义标签,以便在JSP页面中使用PageProperties类。代码如下:
```xml
<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
version="2.0">
<description>Page Properties Tag Library</description>
<tlib-version>1.0</tlib-version>
<short-name>pp</short-name>
<uri>/WEB-INF/tags/pageProperties.tld</uri>
<tag>
<name>pageProperties</name>
<tag-class>PageProperties</tag-class>
<body-content>empty</body-content>
<attribute>
<name>bgColor</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>fontColor</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>fontFamily</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>fontSize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
```
5. 将以上代码保存到Web应用程序的相应目录下,然后在Web浏览器中访问index.jsp页面,即可看到一个带有下拉框的页面。选择下拉框中的选项,页面的背景颜色和字体属性就会相应地改变。
以上就是用javabean制作一个页面,页面的背景颜色以及文字的大小、字体和颜色可以根据用户的选择来实施的代码实现。