Java 使用TreeMap和TreeSet进行排序时未同步

我对两个组件的排序有问题，不知道为什么

我创建了一个分类地图，如下所示：

private static SortedMap<String, String> getMapping( List<LdapMapping> mapping )
  {
    SortedMap<String, String> fieldMapping = new TreeMap<>();
    for ( LdapMapping map : mapping )
    {
      fieldMapping.put( map.getInternalField(), map.getLdapField() );
    }
    return fieldMapping;
  }

  /**
   * Gets the field values from only ldap.
   *
   * @param entry the entry
   * @param mapping the mapping
   * @return the field values
   */
  private static Map<String, Boolean> getFieldValues( SearchResultEntry entry, Map<String, String> mapping )
  {
    SortedSet<String> keys = new TreeSet<>( mapping.keySet() );
    Map<String, Boolean> fields = new HashMap<>();

    for ( String key : keys )
    {
      String ldapField = mapping.get( key );
      String ldapValue = entry.getAttributeValue( ldapField );
      fields.put( ldapValue, Boolean.FALSE );
    }

    return fields;
  }

  ldapUser.setFields( getFieldValues( entry, fieldMapping ) );
  ldapUser.setAction( IMPORT_STATUS_NEW );

"data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "lastName": false,
        "firstName": false,
        "enabled": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "name": false,
        "lastname": false
      }
    },

  "head": [
    "emailAddress",
    "enabled",
    "firstName",
    "lastName",
    "name"
  ],
  "data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    }]

之后，我使用这个sortedMap创建JSON的第二部分，如下所示：

private static SortedMap<String, String> getMapping( List<LdapMapping> mapping )
  {
    SortedMap<String, String> fieldMapping = new TreeMap<>();
    for ( LdapMapping map : mapping )
    {
      fieldMapping.put( map.getInternalField(), map.getLdapField() );
    }
    return fieldMapping;
  }

  /**
   * Gets the field values from only ldap.
   *
   * @param entry the entry
   * @param mapping the mapping
   * @return the field values
   */
  private static Map<String, Boolean> getFieldValues( SearchResultEntry entry, Map<String, String> mapping )
  {
    SortedSet<String> keys = new TreeSet<>( mapping.keySet() );
    Map<String, Boolean> fields = new HashMap<>();

    for ( String key : keys )
    {
      String ldapField = mapping.get( key );
      String ldapValue = entry.getAttributeValue( ldapField );
      fields.put( ldapValue, Boolean.FALSE );
    }

    return fields;
  }

  ldapUser.setFields( getFieldValues( entry, fieldMapping ) );
  ldapUser.setAction( IMPORT_STATUS_NEW );

"data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "lastName": false,
        "firstName": false,
        "enabled": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "name": false,
        "lastname": false
      }
    },

  "head": [
    "emailAddress",
    "enabled",
    "firstName",
    "lastName",
    "name"
  ],
  "data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    }]

如您所见，它们不匹配，因为我希望第二部分中的值与JSON第一部分的顺序匹配，如下所示：

private static SortedMap<String, String> getMapping( List<LdapMapping> mapping )
  {
    SortedMap<String, String> fieldMapping = new TreeMap<>();
    for ( LdapMapping map : mapping )
    {
      fieldMapping.put( map.getInternalField(), map.getLdapField() );
    }
    return fieldMapping;
  }

  /**
   * Gets the field values from only ldap.
   *
   * @param entry the entry
   * @param mapping the mapping
   * @return the field values
   */
  private static Map<String, Boolean> getFieldValues( SearchResultEntry entry, Map<String, String> mapping )
  {
    SortedSet<String> keys = new TreeSet<>( mapping.keySet() );
    Map<String, Boolean> fields = new HashMap<>();

    for ( String key : keys )
    {
      String ldapField = mapping.get( key );
      String ldapValue = entry.getAttributeValue( ldapField );
      fields.put( ldapValue, Boolean.FALSE );
    }

    return fields;
  }

  ldapUser.setFields( getFieldValues( entry, fieldMapping ) );
  ldapUser.setAction( IMPORT_STATUS_NEW );

"data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "lastName": false,
        "firstName": false,
        "enabled": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "name": false,
        "lastname": false
      }
    },

  "head": [
    "emailAddress",
    "enabled",
    "firstName",
    "lastName",
    "name"
  ],
  "data": [
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    },
    {
      "action": "New User",
      "fields": {
        "emailAddress": false,
        "enabled": false,
        "firstname": false,
        "lastname": false,
        "name": false
      }
    }]

注意：我很自然地用显示的get字段替换了实际值

创建第二部分的问题在哪里？

---

是因为我没有正确地将SortedSet与SortedMap结合使用吗？

您在代码中使用了

HashMap

，它没有保留

HashMap

中提到的项目顺序

此类不保证地图的顺序；在里面 特别是，它不能保证订单保持不变 随着时间的推移

---

使用

LinkedHashMap

保留项目的顺序，它应该可以解决您的问题

如何转换为JSON？使用Jacksoni的标准配置是因为使用了

HashMap

，没有保留项目的顺序？也许可以尝试使用

LinkedHashMap

，看看是否可以重现相同的结果，就是这样@SamuelKok！你能把你的解决方案写在一个答案里，这样我就可以接受了吗？太蠢了，我没想到那张羞耻的脸，很高兴它有用。干杯