java - JAXB 解析 Null

Question

我正在尝试使用 jaxb 将测试 XML 转换为 POJO。我不再收到任何错误，只是数据为空。我确信添加所有名称以匹配区分大小写并仔细检查标签名称，但不确定为什么它是空的。

JAXBContext jaxbContext = JAXBContext.newInstance(UserContainer.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
UserContainer users = (UserContainer) jaxbUnmarshaller.unmarshal(inputFile);

上面是我用来从 Spring 中的静态资源目录中提取 XML 文件的代码片段。

XML

<?xml version='1.0' encoding='UTF-8'?>
<UserContainer>
  <description>Test User Data for Dev Database</description>
  <user>
    <username>user_1</username>
    <password>encrypted_password1</password>
    <gender>male</gender>
    <phone>4805551111</phone>
    <email>user1@gmail.com</email>
  </user>
  <user>
    <username>user_2</username>
    <password>encrypted_password2</password>
    <gender>female</gender>
    <phone>4805551111</phone>
    <email>user2@gmail.com</email>
  </user>
  <user>
    <username>user_3</username>
    <password>encrypted_password3</password>
    <gender>trans</gender>
    <phone>1113334454</phone>
    <email>user3@gmail.com</email>
  </user>
</UserContainer>

UserContainer类

import com.core.entities.User;
import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

/**
 * Allows a container to hold a list of users and map to standard POJO
 */
@XmlRootElement(name="UserContainer")
public class UserContainer {
  private List<User> users;

  public UserContainer() {}

  public UserContainer(List<User> users) {
    super();
    this.users = users;
  }

  @XmlElement
  public List<User> getUsers() {
    return users;
  }

  public void setUsers(List<User> users) {
    this.users = users;
  }
}

用户类别

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@Entity
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name="user")
public class User {

  @Id
  @GeneratedValue
  private Long id;

  @XmlElement
  private String username;

  @XmlElement
  private String password;

  @XmlElement
  private String gender;

  @XmlElement
  private String phone;

  @XmlElement
  private String email;

  public User() {}

  public User(String username, String password, String gender, String phone, String email) {
    super();
    this.username = username;
    this.password = password;
    this.gender = gender;
    this.phone = phone;
    this.email = email;
  }

  public String getUserName() {
    return username;
  }

  public void setUserName(String username) {
    this.username = username;
  }

  public String getEncryptedPassword() {
    return password;
  }

  public void setEncryptedPassword(String encryptedPassword) {
    this.password = encryptedPassword;
  }

  public String getGender() {
    return gender;
  }

  public void setGender(String gender) {
    this.gender = gender;
  }

  public String getPhone() {
    return phone;
  }

  public void setPhone(String phone) {
    this.phone = phone;
  }

  public String getEmail() {
    return email;
  }

  public void setEmail(String email) {
    this.email = email;
  }
}

Answer 1

在 UserContainer.java 文件中进行如下更改:

@XmlRootElement(name="UserContainer")
public class UserContainer {

  @XmlElement(name="users")
  private List<User> users;

  public UserContainer() {}

  public UserContainer(List<User> users) {
    super();
    this.users = users;
  }
  public List<User> getUsers() {
    return users;
  }

  public void setUsers(List<User> users) {
    this.users = users;
  }
}

此外，理想情况下，您的 XML 元素必须具有多个值，如下所示:

<?xml version='1.0' encoding='UTF-8'?>
<UserContainer>
  <description>Test User Data for Dev Database</description>
  <users>
      <user>
        <username>user_1</username>
        <password>encrypted_password1</password>
        <gender>male</gender>
        <phone>4805551111</phone>
        <email>user1@gmail.com</email>
      </user>
      <user>
        <username>user_2</username>
        <password>encrypted_password2</password>
        <gender>female</gender>
        <phone>4805551111</phone>
        <email>user2@gmail.com</email>
      </user>
      <user>
        <username>user_3</username>
        <password>encrypted_password3</password>
        <gender>trans</gender>
        <phone>1113334454</phone>
        <email>user3@gmail.com</email>
      </user>
  </users
</UserContainer>