接Struts2专题上一篇
1、Action的定义，以及mapping映射描述，看代码注释
Action在MVC中充当Controller控制器的角色，Struts2定义一个Action类通常继续ActionSupport类。
package cn.imethan.web.struts2;
import com.opensymphony.xwork2.ActionSupport;
/**
* HelloWorldAction.java
*
* @author Ethan Wong
* @since JDK 1.7
* @datetime 2015年12月31日上午9:39:42
*/
public class HelloWorldAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private MessageStore messageStore;
public String execute() throws Exception {
messageStore = new MessageStore() ;
return SUCCESS;//对应配置文件里面的 "success"
}
public MessageStore getMessageStore() {
return messageStore;
}
public void setMessageStore(MessageStore messageStore) {
this.messageStore = messageStore;
}
}<!-- method方法指定Action调用执行的方法名称 --> <action name="hello" class="org.apache.struts.helloworld.action.HelloWorldAction" method="execute"> <!-- result的名称指定返回名称，对用配置的jsp页面 --> <result name="success">/WEB-INF/view/HelloWorld.jsp</result> </action>
2、Action中添加私有变量，处理from或者url提交的参数
在HelloWorldAction中添加如下私有变量userName和get、set方法
private String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}index.jsp添加如下表单内容：
<s:form action="hello"> <s:textfield name="userName" label="Your name" /> <s:submit value="Submit" /> </s:form>
HelloWorld.jsp添加userName展现内容：
<p>userName：<s:property value="userName"/> </p>
部署运行项目，提交表单参数，执行name为hello的Action，浏览器返回结果如下：
userName：imethan，其中imethan是输入表单提交的内容。
3、通过创建Model类，在Model类中设置变量，用于接收表单参数
创建PersonModel类、RegisterAction Action类、register.jsp注册表单页面和成功返回页面thankyou.jsp、struts.xml配置文件添加Action节点
public class Person {
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
import com.opensymphony.xwork2.ActionSupport;
public class RegisterAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private Person personBean;
public String register(){
return "register";
}
@Override
public String execute() throws Exception {
//call Service class to store personBean's state in database
return SUCCESS;
}
public Person getPersonBean() {
return personBean;
}
public void setPersonBean(Person person) {
personBean = person;
}
}register.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Register</title> </head> <body> <h3>Register for a prize by completing this form.</h3> <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>
thankyou.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html> <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='enter' />" >Return to home page</a>.</p> </body> </html>
<action name="enter" class="cn.imethan.web.struts2.RegisterAction" method="register"> <result name="register">/WEB-INF/view/register.jsp</result> </action> <action name="register" class="cn.imethan.web.struts2.RegisterAction" method="execute"> <result name="success">/WEB-INF/view/thankyou.jsp</result> </action>
创建完成后，部署运行，http://localhost:8080/enter.action，输入表单信息如下：
Register for a prize by completing this form.
提交返回信息如下：
Thank you for registering for a prize.
Your registration information: First Name: ethan Last Name: wong Email: ethan@qq.com Age: 100
参考文档
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