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Struts2 官方文档使用—Processing Forms

2016-06-14 12:03 399 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

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.jspstruts.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="<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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