问我们可以从struts2中的操作类中调用表单验证方法吗？

EN

public class Login extends ActionSupport {

private String userName;
private String password;

public Login() {
}

public String execute() {
    return SUCCESS;
}

public void validate() {
    if (getUserName().length() == 0) {
        addFieldError("userName", "User Name is required");
    } else if (!getUserName().equals("Eswar")) {
        addFieldError("userName", "Invalid User");
    }
    if (getPassword().length() == 0) {
        addFieldError("password", getText("password.required"));
    }
}

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;
}
}