您的位置：首页 > 编程语言 > Java开发

Struts2 官方文档学习—Processing Forms

2011-03-25 13:14 225 查看

Reference:《ST2.NO.0005 struts2.0 官网文档学习笔记之五 - Processing Forms》《Struts 2 的拦截器（一）》

直接贴代码：一个注册的过程

PersonBean.java

package test;

public class PersonBean implements java.io.Serializable {

 private static final long serialVersionUID = -5007279129818462704L;

 private String firstName;

 private String lastName;

 private String email;

 private int age;

 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 getEmail() {

 return email;

 public void setEmail(String email) {

 this.email = email;

 public int getAge() {

 return age;

 public void setAge(int age) {

 this.age = age;

 public String toString() {

 return "First Name: " + getFirstName() + " Last Name:"

 + getLastName() + " Email:" + getEmail() + " Age:"

 + getAge();

RegisterAction.java

package test;

import com.opensymphony.xwork2.ActionSupport;

public class RegisterAction extends ActionSupport {

 private static final long serialVersionUID = -726538404572102944L;

 private PersonBean personBean;

 public String execute() {

 /* Call other Service class to store personBean's state in database */

 return SUCCESS;

 public void setPersonBean(PersonBean personBean) {

 this.personBean = personBean;

 public PersonBean getPersonBean() {

 return this.personBean;

<%@ page language="java" contentType="text/html; charset=utf-8"

 pageEncoding="utf-8"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>register</title>

</head>

<body>

 <s:form action="register">

 <s:textfield name="personBean.firstName" label="First name" />

 <s:textfield name="personBean.lastName" label="Last name" />

 <s:textfield name="personBean.email" label="Email" />

 <s:textfield name="personBean.age" label="Age" />

 <s:submit />

 </s:form>

</body>

</html>

我理解的过程：

JSP文件中<s:textfield name="personBean.firstName" label="First name" />这类代码首先会在RegisterAction里面查找一个叫personBean的对象，会调用到action里面的getPersonBean()方法，显然这个时候this.personBean为null，我的猜想是在发现为null的时候会去调用setPersonBean，使用setPersonBean()的参数时框架会自动用PersonBean 类的默认的构造方法来创建这个对象（这时候personBean已经就不是null了但是其全部的值,firstName之类还都是null），然后又调用getPersonBean得到了不为null的personBean对象。下一步就是查找personBean.firstName了，调用personBean里面的setFisrtName（）赋了值。这个地方忘了设断点查了不过可以想象也应该和personBean一样的先调用getFirstName()发现为null（我估计不为null也会调用后面的setter），然后调用setFirstName()给丫赋了一值。这些全部是发生在execute()方法执行之前的哦！Thanks to Struts2的默认拦截器。

在注册成功之后会跳转到Thankyou.jsp

struts.xml片段

<action name="register" class="test.RegisterAction"

 method="execute">

 <result name="success">/test/Thankyou.jsp</result>

 </action>

Thankyou.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

 pageEncoding="UTF-8"%>

<%@taglib prefix='s' uri='/struts-tags'%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Registration Successful</title>

</head>

<body>

 <h3>Thank you for registering for a prize.</h3>

<p>

 Your registration information:

 <s:property value="personBean" />

 </p>

<p>

 <a href="<s:url action='index' />"<Return to home page</a>.

 </p>

</body>

</html>

这个里面<s:property value="personBean" />又通过get得到了action里面的perseonBean对象（已经都有值了哦），然后toString()输出了

以上理解如有不正之处还望指出

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航