如何在JSP中设置和获取bean的属性？
在此示例中，您将学习如何设置和获取在JSP页面中定义的Java对象属性的值。对于此示例，我们首先开始创建一个名为的变量，该变量customer将具有类的Customer类型。为了创建这个变量，我们使用<jsp:useBean>action。
创建customer变量后，我们可以customer使用<jsp:setProperty>操作设置bean的属性值。为了获得customerbean的属性值，我们使用<jsp:getProperty>动作。
and动作中的name属性引用了我们的bean。该属性告诉我们要设置或获取的属性。要设置属性的值，我们使用属性。setPropertygetPropertycustomerpropertyvalue
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>JSP - Bean Property Demo</title>
</head>
<body>
<jsp:useBean id="customer"/>
<jsp:setProperty name="customer" property="id" value="1"/>
<jsp:setProperty name="customer" property="firstName" value="John"/>
<jsp:setProperty name="customer" property="lastName" value="Doe"/>
<jsp:setProperty name="customer" property="address" value="Sunset Road"/>
Customer Information: <%= customer.toString() %><br/>
Customer Name: <jsp:getProperty name="customer" property="firstName"/>
<jsp:getProperty name="customer" property="lastName"/>
</body>
</html>这是我们的Customerbean的代码。这个bean包含属性，如id，firstName，lastName和address。
package org.nhooo.example.bean;
public class Customer {
private int id;
private String firstName;
private String lastName;
private String address;
public Customer() {
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Customer{" +
"id=" + id +
", firstName='" + firstName + ''' +
", lastName='" + lastName + ''' +
", address='" + address + ''' +
'}';
}
}我们访问JSP页面，我们将看到以下输出：
Customer Information: Customer{id=1, firstName='John', lastName='Doe', address='Sunset Road'}Customer Name: John Doe