Struts2 官方文档使用—Processing Forms

来源：互联网发布：2017网络棋牌赌博案件编辑：程序博客网时间：2024/05/18 00:34

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

   1: package test;   2:     3: public class PersonBean implements java.io.Serializable {   4:     private static final long serialVersionUID = -5007279129818462704L;   5:     private String firstName;   6:     private String lastName;   7:     private String email;   8:     private int age;   9:    10:     public String getFirstName() {  11:         return firstName;  12:     }  13:    14:     public void setFirstName(String firstName) {  15:         this.firstName = firstName;  16:     }  17:    18:     public String getLastName() {  19:         return lastName;  20:     }  21:    22:     public void setLastName(String lastName) {  23:         this.lastName = lastName;  24:     }  25:    26:     public String getEmail() {  27:         return email;  28:     }  29:    30:     public void setEmail(String email) {  31:         this.email = email;  32:     }  33:    34:     public int getAge() {  35:         return age;  36:     }  37:    38:     public void setAge(int age) {  39:         this.age = age;  40:     }  41:    42:     public String toString() {  43:         return "First Name: " + getFirstName() + " Last Name:  "  44:                 + getLastName() + " Email:      " + getEmail() + " Age:      "  45:                 + getAge();  46:     }  47: }

 RegisterAction.java

   1: package test;   2:     3: import com.opensymphony.xwork2.ActionSupport;   4:     5: public class RegisterAction extends ActionSupport {   6:     7:     private static final long serialVersionUID = -726538404572102944L;   8:     private PersonBean personBean;   9:    10:     public String execute() {  11:         /* Call other Service class to store personBean's state in database */  12:         return SUCCESS;  13:     }  14:    15:     public void setPersonBean(PersonBean personBean) {  16:         this.personBean = personBean;  17:     }  18:    19:     public PersonBean getPersonBean() {  20:         return this.personBean;  21:     }  22: }

   1: <%@ page language="java" contentType="text/html; charset=utf-8"   2:     pageEncoding="utf-8"%>   3: <%@ taglib prefix="s" uri="/struts-tags"%>   4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">   5: <html>   6: <head>   7: <meta http-equiv="Content-Type" content="text/html; charset=utf-8">   8: <title>register</title>   9: </head>  10: <body>  11:     <s:form action="register">  12:         <s:textfield name="personBean.firstName" label="First name" />  13:         <s:textfield name="personBean.lastName" label="Last name" />  14:         <s:textfield name="personBean.email" label="Email" />  15:         <s:textfield name="personBean.age" label="Age" />  16:         <s:submit />  17:     </s:form>  18: </body>  19: </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

   1: <action name="register" class="test.RegisterAction"   2:             method="execute">   3:             <result name="success">/test/Thankyou.jsp</result>   4:         </action>

Thankyou.jsp

   1: <%@ page language="java" contentType="text/html; charset=UTF-8"   2:     pageEncoding="UTF-8"%>   3: <%@taglib prefix='s' uri='/struts-tags'%>   4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">   5: <html>   6: <head>   7: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">   8: <title>Registration Successful</title>   9: </head>  10: <body>  11:     <h3>Thank you for registering for a prize.</h3>  12:     <p>  13:         Your registration information:  14:         <s:property value="personBean" />  15:     </p>  16:     <p>  17:         <a href="&lt;s:url action='index' />"<Return to home page</a>.  18:     </p>  19: </body>  20: </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。

直接到这里参考:http://www.cnblogs.com/jersey/category/289906.html

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