JavaBean

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先看代码：

package entity;

public class Student {
private String username;
private int age;

public Student() {
super();
}

public Student(String username, int age) {
  super();
  this.username = username;
  this.age = age;
}

public String getUsername() {
  return username;
}

public void setUsername(String username) {
this.username = username;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

}

*******************************************************************

<jsp:useBean id="student" class="entity.Student"></jsp:useBean>

<jsp:setProperty property="username" name="student" value="syy" />
<jsp:setProperty property="age" name="student" value="23" />

<jsp:getProperty property="username" name="student"/>
<jsp:getProperty property="age" name="student"/>

总结：JavaBean需要注意的三个点

1)这个Java类必须具有一个无参的构造函数.

2)属性必须私有化,用private修饰.

3)提供公开的getter和setter方法获取属性值或者设置属性值.

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