Action接受请求参数（ 三种方式）

Struts2作为MVC框架，必须要负责解析HTTP请求参数，并将其封装到Model对象中。Struts2提供了非常强大的类型转换机制用于请求数据到model对象的封装。

一、方式一

1）Action本身作为model对象，通过成员setter封装。用Action动作类作为模型对象。

public class userAction extends ActionSupport {
   private String username;
   private String password;
   public String regist()
 {
    if("pjm".equals(username) && "123".equals(password))
    {
       return SUCCESS;
    }else
    {
       return "login";
    }
 }
 public String getUsername() {
      return username;
 }
 public void setUsername(String username) {
      this.username = username;
 }
 public String getPassword() {
      return password;
 }
 public void setPassword(String password) {
      this.password = password;
 }
}

2）创建独立的Model对象，页面通过ognl封装(动作类和模型分开，推荐使用)
a.模型

public class Person implements Serializable{
 // 属性和form表单中的字段名一致
 private String username;
 private String password;
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 @Override
 public String toString() {
  return "Person [username=" + username + ", password=" + password + "]";
 }
}

b.动作

public class PersonAction extends ActionSupport {
 // 动作和模型分开
 private Person person;
 public Person getPerson() {
  System.out.println("getter");
  return person;
 }
 public void setPerson(Person person) {
  System.out.println("setter");
  this.person = person;
 }
 public String regist()
 {
  if("pjm".equals(person.getUsername()) && "123".equals(person.getPassword()))
  {
   return SUCCESS;
  }else
  {
   return "login";
  }
 }
}

c.配置文件

<package name="re2" extends="struts-default" namespace="/person">
  <action name="regist" class="com.pangu.action.PersonAction" method="regist">
   <result name="success">/success.jsp</result>
   <result name="login">/success.jsp</result>
  </action>
 </package>

d.表单页面

<form action="${pageContext.request.contextPath}/person/regist.action" method="post">
      用户名： <input type="text" name="person.username"/><br/>
      密码： <input type="password" name="person.password"/><br/>
      <input type="submit" value="登陆"/>
 </form>

3）使用modelDriven接口，对请求数据进行封装(模型驱动：ModelDriven)
注：该功能是由一个叫做modelDriven的拦截器完成的。
a. 模型和方式二一样
b.动作

// 实现ModelDriven接口
public class CustomerAction extends ActionSupport implements ModelDriven<Customer>{

 private Customer customer = new Customer();  // 这里必须初始化
 public Customer getCustomer() {
  return customer;
 }
 public void setCustomer(Customer customer) {
  this.customer = customer;
 }
 public String regist()
 {
  System.out.println(customer);
  if("pjm".equals(customer.getUsername()) && "123".equals(customer.getPassword()))
  {
   return SUCCESS;
  }else
  {
   return "login";
  }
 }
 @Override
 public Customer getModel() {
  // TODO Auto-generated method stub
  return customer;
 }
}

c、配置文件

<package name="re3" extends="struts-default" namespace="/customer">
  <action name="regist" class="com.pangu.action.CustomerAction" method="regist">
   <result name="success">/success.jsp</result>
   <result name="login">/success.jsp</result>
  </action>
 </package>

d 、表单页面

<form action="${pageContext.request.contextPath}/customer/regist.action" method="post">
  用户名： <input type="text" name="username"/><br/>
  密码： <input type="password" name="password"/><br/>
  <input type="submit" value="登陆"/>
 </form>