J2EE中的struts2表单细节处理

　　　<s:form  action="user_save">
     <s:token></s:token>
       <s:textfield name="username" label="用户名"></s:textfield>
       <s:textfield name="pwd" label="密码"></s:textfield>
       <s:submit value="提交"></s:submit>
     </s:form>

package com.xinzhi.action;
import java.util.List;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.opensymphony.xwork2.util.ValueStack;
import com.xinzhi.dao.impl.UserDaoImpl;
import com.xinzhi.entity.UserEntity;
public class UserAction extends ActionSupport implements
    ModelDriven<UserEntity> {
  private static final long serialVersionUID = 1L;
  private UserEntity userEntity = new UserEntity();
  UserDaoImpl userDaoImpl = new UserDaoImpl();
  public UserEntity getUserEntity() {
    return userEntity;
  }
  public void setUserEntity(UserEntity userEntity) {
    this.userEntity = userEntity;
  }
  public UserEntity getModel() {
    return userEntity;
  }
}

public String view() {
    UserEntity selectAUserEntity = userDaoImpl.selectAUserEntity(userEntity
        .getId());
    ValueStack valueStack = ActionContext.getContext().getValueStack();
    valueStack.pop();
    valueStack.push(selectAUserEntity);
    return "view";
  }

　<s:form  action="user_save">
     　　<s:token></s:token>
       <s:textfield name="username" label="用户名"></s:textfield>
       <s:textfield name="pwd" label="密码"></s:textfield>
       <s:submit value="提交"></s:submit>
     </s:form>

　<action name="user_*" class="com.xinzhi.action.UserAction" method="{1}">
      <interceptor-ref name="defaultStack"></interceptor-ref>
      <interceptor-ref name="token">
        <param name="includeMethods">save</param>
      </interceptor-ref>
    </action>