java - 使 struts 2 中的变量在 jsp 中可用

Question

我正在尝试有条件地设置元素的 css 。这是 jsp 中的行:

<s:textfield name="registerBean.email" placeholder="Email Address*" cssClass="INSERT userNameError here" required="" />
<s:textfield name="registerBean.userName" placeholder="Username*" cssClass="INSERT emailError here" required="" />

在我的 Action 类中，我有这样的内容:

package actions;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import service.implementations.UserServiceImplementation;
import service.interfaces.UserService;
import util.REGISTER_RESULT;

import com.opensymphony.xwork2.ActionSupport;

import entities.User;

public class Register extends ActionSupport {

    private User registerBean;
    private String userNameError = "register";
    private String emailError = "register";

    @Override
    public String execute()
    {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("ExamModulePu");
        EntityManager em = emf.createEntityManager();
        UserService service = new UserServiceImplementation(em);
        REGISTER_RESULT result = service.registerUser(registerBean);


        if(result.isDuplicateEmail())
            setEmailError("register error");
        if(result.isDuplicateUserName())
            setUserNameError("register error");
        em.close();
        emf.close();
        return result.toString();
    }

    public User getRegisterBean() {
        return registerBean;
    }

    public void setRegisterBean(User registerBean) {
        this.registerBean = registerBean;
    }

    public String getEmailError() {
        return emailError;
    }

    public void setEmailError(String emailError) {
        this.emailError = emailError;
    }

    public String getUserNameError() {
        return userNameError;
    }

    public void setUserNameError(String userNameError) {
        this.userNameError = userNameError;
    }
}

我怎样才能让这些变量可供jsp使用？或者有更好的方法来完成我想做的事情吗？

Answer 1

要为验证失败的字段提供一些 CSS 类，您可以使用 cssErrorClass 属性。

<s:textfield name="registerBean.userName" placeholder="Username*" cssErrorClass="register error" required="" />

并在您的操作中使用 addFieldError 方法将错误添加到特定字段。