<h1>数据封装方式一：提供set方法</h1>
<form action="${pageContext.request.contextPath}/xxx.action" method="post">
    姓名：<input type="text" name="name" /><br/>
    年龄：<input type="text" name="age" />
   提交：<input type="submit" value="提交" />
</form>

public class xxxAction extends ActionSupport {
      private String name;
      private Integer age;

       public void setName() {
               this.name = name;
       }
       public void setAge() {
               this.age = age;
       }  

     public String execute() throws Exception {
               System.out.println(name);
               System.out.println(age);
                return NONE;
      }
}            

<h1>数据封装方式二：提供页面OGNL表达式的方式</h1>
<form action="${pageContext.request.contextPath}/xxx.action" method="post">
    姓名：<input type="text" name="user.name" /><br/>
    年龄：<input type="text" name="user.age" /><br/>
   提交：<input type="submit" value="提交" />
</form>

public class xxxAction extends ActionSupport {
      // 在Action中封装对象的属性：提供get AND set方法
      private User user;

       public void setUser() {
               this.user = user;
       }
       public void getUser() {
               this.user = user;
       }  

     public String execute() throws Exception {
               System.out.println(user);
                return NONE;
      }
}    

<h1>数据封装方式三：模型驱动的方式</h1>
<form action="${pageContext.request.contextPath}/xxx.action" method="post">
    姓名：<input type="text" name="name" /><br/>
    年龄：<input type="text" name="age" /><br/>
   提交：<input type="submit" value="提交" />
</form>

public class xxxAction extends ActionSupport implements ModelDriven<User> {
     
      private User user = new User();
    
      // 模型驱动的使用方法:
      @Override
      public User getModel() {
              return user; 
     }

     public String execute() throws Exception {
               System.out.println(user);
                return NONE;
      }
}