JavaBean是一個遵循特定寫法的Java類，它通常具有如下特點：
（1）這個Java類必須具有一個無參的構造函數
（2）屬性必須私有化。
（3）私有化的屬性必須通過public類型的方法暴露給其它程序，並且方法的命名也必須遵守一定的命名規範。
也沒什麼好說的，直接上代碼實例吧
整體文件佈置
ArrayToString.java
package entity;
public class ArrayToString {
// StringBuffer 的性能修改更好
private StringBuffer string = null;
public String arrayToString(String[] likes) {
string = new StringBuffer();
if(likes.length != 0 && likes != null) {
for(String str : likes) {
string.append(str);
string.append(",");
}
}
if(string.length() > 0) { // 刪除末尾的逗號
string.deleteCharAt(string.length() -1);
}
return string.toString();
}
}
Student.java（Java Bean）
package entity;
public class Student {
private String name;
private String id;
private String[] likes;
private Integer score;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String[] getLikes() {
return likes;
}
public void setLikes(String[] likes) {
this.likes = likes;
}
public Integer getScore() {
return score;
}
public void setScore(Integer score) {
this.score = score;
}
}
stuMessage.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="view.jsp" method="post">
<p>
name: <input type="text" name="name">
</p>
<p>
id: <input type="text" name="id">
</p>
<p>
likes: <input type="checkbox" name="likes" value="代碼">代碼
<input type="checkbox" name="likes" value="爬山">爬山
<input type="checkbox" name="likes" value="電影">電影
<input type="checkbox" name="likes" value="音樂">音樂
</p>
<p>
score: <input type="text" name="score">
</p>
<input type="submit" value="提交">
</form>
</body>
</html>
view.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<%request.setCharacterEncoding("utf-8"); %>
<jsp:useBean id="Student" class="entity.Student" scope="page">
<!-- 將獲取到的數據設置在 Student 類中 -->
<jsp:setProperty name="Student" property="*"/>
</jsp:useBean>
<jsp:useBean id="ArrayToString" class="entity.ArrayToString" ></jsp:useBean>
<p>name:
<jsp:getProperty property="name" name="Student"/>
</p>
<p>id:
<jsp:getProperty property="id" name="Student"/>
</p>
<p>likes:
<%=ArrayToString.arrayToString(Student.getLikes()) %>
</p>
<p>score:
<jsp:getProperty property="score" name="Student"/>
</p>
</body>
</html>