什么是JavaBean

[b]Javabean 就是一个类，这个类就定义一系列 get<Name> 和 set<Name> 方法。 [/b]So simple ！
[b]Javabean 就是为了和 jsp 页面传数据化简交互过程而产生的值对象。[/b]

使用 javabean 和不用 javabean 的区别：
一个 javabean 就是为 jsp 页面上的元素一一开辟一个空间，然后根据需要赋值、读值。而如果不用 javabean ，就直接使用 HttpServlet 的 request 对象：只在 jsp 页面间传递获取数据：
String name=req.getParameter(“name”);

再来段英文解释：
JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool. Practically, they are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is a Java Object that is serializable, has a nullary constructor, and allows access to properties using getter and setter methods.

下面的例子就是一个JavaBean:
[code]
/**
* Class <code>DemoBean</code>.
*/
public class DemoBean implements java.io.Serializable {

private String name;

private boolean deceased;

/** No-arg constructor (takes no arguments). */
public PersonBean() {
}

/**
* Property <code>name</code> (note capitalization) readable/writable.
*/
public String getName() {
return this.name;
}

/**
* Setter for property <code>name</code>.
* @param name
*/
public void setName(final String name) {
this.name = name;
}

/**
* Getter for property "deceased"
* Different syntax for a boolean field (is vs. get)
*/
public boolean isDeceased() {
return this.deceased;
}

/**
* Setter for property <code>deceased</code>.
* @param deceased
*/
public void setDeceased(final boolean deceased) {
this.deceased = deceased;
}
}

[/code]