java - 尝试为当前用户设置新的详细信息

Question

我对编程很陌生，而且我对java的了解很有限。我正在修改一个类似 Facebook 的网站模板，这样我就可以学习和添加功能。我试图允许当前用户更改他们的详细信息，例如姓名、电子邮件、密码等，但无法弄清楚 java 是否可以这样做。当我尝试时，所发生的只是在当前用户之上创建一个全新的用户:/这是我到目前为止所拥有的:

public static void changeDetails(String firstName, String lastName, String email, String password, String age, String nationality)
  {
    Logger.info("New details are: " + firstName + " " + lastName + " " + email + " " + password + " " + age + " " + nationality + " ");

    User user = new User(firstName, lastName, email, password, age, nationality);
    user.save();
    Home.index();
  }

这是用户类别:

package models;

import java.util.List;
import java.util.ArrayList;

import javax.persistence.OneToMany;
import javax.persistence.Entity;

import controllers.Home;
import play.db.jpa.Model;
import play.db.jpa.Blob;

@Entity
public class User extends Model
{
  public String firstName;
  public String lastName;
  public String email;
  public String password;
  public String age;
  public String nationality;
  public String statusText;
  public Blob   profilePicture;

  @OneToMany(mappedBy = "sourceUser")
  public List<Friendship> friendships = new ArrayList<Friendship>();

  public User(String firstName, String lastName, String email, String password, String age, String nationality)
  {
    this.firstName = firstName;
    this.lastName = lastName;
    this.email = email;
    this.password = password;
    this.age = age;
    this.nationality = nationality;
  }


  public static User findByEmail(String email)
  {
    return find("email", email).first();
  }

  public boolean checkPassword(String password)
  {
    return this.password.equals(password);
  }

  public void befriend(User friend)
  {
    Friendship friendship = new Friendship(this, friend);
    friendships.add(friendship);
    friendship.save();
    save();
  }

  public void unfriend(User friend)
  {
    Friendship thisFriendship = null;

    for (Friendship friendship:friendships)
    {
      if (friendship.targetUser== friend)
      {
        thisFriendship = friendship;
      }
    }
    friendships.remove(thisFriendship);
    thisFriendship.delete();
    save();
  }

  @OneToMany(mappedBy = "to")
  public List<Message> inbox = new ArrayList<Message>();

  @OneToMany(mappedBy = "from")
  public List<Message> outbox = new ArrayList<Message>();

  public void sendMessage (User to, String messageText)
  {
    Message message = new Message (this, to, messageText);
    outbox.add(message);
    to.inbox.add(message);
    message.save();
  } 



}

我可以看到我的问题可能是“新用户和 user.save”，但我不知道我应该有什么。感谢您的帮助:)

Answer 1

您必须将 User 类的实例传递给changeDetails 方法，并使用setter 方法更改它的属性。

编辑:

向您的代码添加注释以查看问题所在:

public static void changeDetails(String firstName, String lastName, String email, String password, String age, String nationality)
  {
    Logger.info("New details are: " + firstName + " " + lastName + " " + email + " " + password + " " + age + " " + nationality + " ");

    //here you are creating new user object and setting it`s properties, wrong
    User user = new User(firstName, lastName, email, password, age, nationality); 
    user.save();
    Home.index();
  }

建议的修复(假设您在 User 类中有 setter 方法):

public static void changeDetails(User user, String firstName, String lastName, String email, String password, String age, String nationality)
  {
    Logger.info("New details are: " + firstName + " " + lastName + " " + email + " " + password + " " + age + " " + nationality + " ");

    user.setfirstName(firstName);
    user.setlastName(lastName);
    user.setEmail(email); 
    user.setPassword(password); 
    user.setAge(age); 
    user.setNationality(nationality);

    Home.index();
  }

或者在看到您的编辑和更多没有设置方法的代码后，请执行以下操作:

public static void changeDetails(User user, String firstName, String lastName, String email, String password, String age, String nationality)
  {
    Logger.info("New details are: " + firstName + " " + lastName + " " + email + " " + password + " " + age + " " + nationality + " ");

    user.firstName = firstName;
    user.lastName = lastName;
    user.email = email; 
    user.password = password; 
    user.age = age; 
    user.nationality = nationality;

    Home.index();
  }