使用 JAX-RS 将 Java 嵌套类转换为 JSON答案

【问题标题】：Convert Java nested class to JSON using JAX-RS使用 JAX-RS 将 Java 嵌套类转换为 JSON
【发布时间】：2015-08-03 21:05:03
【问题描述】：

我基本上想通过我的 JAVA REST API 将 Customer 类的对象作为 JSON 发送到 android。

我的Customer 类如下所示：

public class Customer {
    private long customerId;
    private String firstName;
    private String middleName;
    private String lastName;
    private String gender;
    private long accountId;

    class Account {
        private long accountId;
        private int balance;
    }
}

我期望的 JSON 应该是这样的：

{
 "customerId": "something",
 "firstName": "something",
 "middleName": "something",
 "gender": "M or F",
 "accountId": "something",
 "Account": {
  "accountId": "something",
  "balance": "something",
 } 
}

额外信息：

我使用此依赖项转换为 JSON。

 <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
    </dependency>

我怎样才能使这个类的一个对象，使它的 JAX-RS 转换的 JSON 看起来像这样？

【问题讨论】：

标签： java android json jersey jax-rs

【解决方案1】：

外部类可以有多个内部类实例。如果你想将它编组为 JSON，你应该告诉，使用什么实例。为此，我想将Account account 字段添加到外部类中。然后，您需要为私有字段和XmlElement 注释添加getter/setter。最后，它看起来像这样：

import javax.xml.bind.annotation.XmlElement;

public class Customer {
    private long customerId;
    private String firstName;
    private String middleName;
    private String lastName;
    private String gender;
    private long accountId;
    private Account account;

    class Account {
        private long accountId;
        private int balance;

        @XmlElement(name = "accountId")
        public long getAccountId() {
            return accountId;
        }
        public void setAccountId(long accountId) {
            this.accountId = accountId;
        }
        @XmlElement(name = "balance")
        public int getBalance() {
            return balance;
        }
        public void setBalance(int balance) {
            this.balance = balance;
        }
    }

    @XmlElement(name = "customerId")
    public long getCustomerId() {
        return customerId;
    }
    public void setCustomerId(long customerId) {
        this.customerId = customerId;
    }
    @XmlElement(name = "firstName")
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    @XmlElement(name = "middleName")
    public String getMiddleName() {
        return middleName;
    }
    public void setMiddleName(String middleName) {
        this.middleName = middleName;
    }
    @XmlElement(name = "lastName")
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    @XmlElement(name = "gender")
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @XmlElement(name = "accountId")
    public long getAccountId() {
        return accountId;
    }
    public void setAccountId(long accountId) {
        this.accountId = accountId;
    }
    @XmlElement(name = "account")
    public Account getAccount() {
        return account;
    }
    public void setAccount(Account account) {
        this.account = account;
    }
}

现在，您可以像这样在 Jersey 客户端中使用此类的实例：

Entity e = Entity.entity(customer, "application/json");
Response r = invocationBuilder.method("POST", e);

【讨论】：