JSONArray中的JSONObject不太正确

Question

我正在尝试构建一个如下所示的JSON字符串：

{ "account": { "description": "desc2", "users": [ { "user": { "username": "Zogbi", "password": "password1", "firstName": "Tim", "lastName": "Smith", } } ] } }

这是什么，但是：

{ "account": { "users":[{ "middleName":"S","lastName":"Smith","username":"Zogbi","alias":"Gibbus","firstName":"Tim","password":"password1" } ] } }

所以，有两个问题： 我在“帐户”之后需要一个“描述” 2.我需要一个“用户”对象，它是“用户”数组的一部分。

这是我的代码：

JSONObject account = new JSONObject();
JSONArray users = new JSONArray();
JSONObject user = new JSONObject();
JSONObject mainObj = new JSONObject();
account.put("users", users);
users.put("user");
user.put("username", "Zogbi");
user.put("password", "password1");
user.put("firstName", "Tim");
user.put("lastName", "Smith");
user.put("middleName", "S");
user.put("alias", "Gibbus");
mainObj.put("account", account);

感谢任何帮助！

Answer 1

在将对象放入数组时删除引号。

你需要另一个对象，因为users是一个对象数组（让我们调用userassoc），而那些对象有一个成员“user”，它是一个用户对象。像这样：

JSONObject account = new JSONObject();
JSONArray users = new JSONArray();
JSONObject userassoc = new JSONObject();
JSONObject user = new JSONObject();
JSONObject mainObj = new JSONObject();
account.put("users", users);
users.put(userassoc);
userassoc.put("user", user);
user.put("username", "Zogbi");
user.put("password", "password1");
user.put("firstName", "Tim");
user.put("lastName", "Smith");
user.put("middleName", "S");
user.put("alias", "Gibbus");
mainObj.put("account", account);    

看起来像一个奇怪的JSON结构。你得到了正确的任务吗？

Answer 2

手动构建JSON并不比手动构建XML更好！

您不会通过写出单个字节来编写JPEG文件，而不是手动编写单个对象和数组条目。

使用支持良好的全功能JSON序列化器/解串器框架，我最喜欢的是Jackson。

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.vertigrated.FormattedRuntimeException;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

public class Q26110375
{
    public static void main(final String[] args)
    {
        final User user = new User("Zogbi", "password1", "Tim", "S", "Smith", "Gibbus");
        final Account account = new Account("desc2", user);

        try
        {
            final ObjectMapper m = new ObjectMapper();
            m.enable(SerializationFeature.INDENT_OUTPUT);
            m.enable(SerializationFeature.WRAP_ROOT_VALUE);
            m.writeValue(System.out, account);
        }
        catch (final IOException e)
        {
            throw new FormattedRuntimeException(e, "Could not convert %s to Json because of %s", account.getClass(), e.getMessage());
        }
    }

    private static class User
    {
        @JsonProperty
        private final String username;
        @JsonProperty
        private final String password;
        @JsonProperty
        private final String firstName;
        @JsonProperty
        private final String middleName;
        @JsonProperty
        private final String lastName;
        @JsonProperty
        private final String alias;

        private User(@Nonnull final String username, @Nonnull final String password, @Nonnull final String firstName,
                     @Nonnull final String middleName, @Nonnull final String lastName, @Nonnull final String alias)
        {
            this.username = username;
            this.password = password;
            this.firstName = firstName;
            this.middleName = middleName;
            this.lastName = lastName;
            this.alias = alias;
        }
    }

    @JsonRootName("account")
    private static class Account
    {
        @JsonProperty
        private final String description;
        @JsonProperty
        private final List<User> users;

        private Account(@Nonnull final String description, @Nonnull final User... users)
        {
            this.description = description;
            this.users = Arrays.asList(users);
        }
    }
}

无痛地生成以下内容：

{
  "account" : {
    "description" : "desc2",
    "users" : [ {
      "username" : "Zogbi",
      "password" : "password1",
      "firstName" : "Tim",
      "middleName" : "S",
      "lastName" : "Smith",
      "alias" : "Gibbus"
    } ]
  }
}

包含所有依赖项的完整项目位于我的GitHub repository。

FormattedRuntimeException.java

的代码