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                # JAXB `@XmlRootElement`注解示例 > 原文: [https://howtodoinjava.com/jaxb/xmlrootelement-annotation/](https://howtodoinjava.com/jaxb/xmlrootelement-annotation/) **[JAXB](https://howtodoinjava.com/jaxb/jaxb-annotations/) `@XmlRootElement`注解**的 Java 示例及其在編組和解組操作期間的用法詳細說明。 ## 1\. JAXB `@XmlRootElement`注解類型 `@XmlRootElement`將類或[枚舉類型](https://howtodoinjava.com/java/enum/guide-for-understanding-enum-in-java/)映射到 XML 元素。 當使用`@XmlRootElement`注解來注解頂級類或枚舉類型時,則其值在 XML 文檔中表示為 XML 元素。 `@XmlRootElement`注解可以與以下注解一起使用:`XmlType`,`XmlEnum`,`XmlAccessorType`,`XmlAccessorOrder`。 #### 1.1 語法 ```java //Without name attribute @XmlRootElement //1 //With name attribute @XmlRootElement(name = "employee") //2 ``` ## 2\. JAXB `@XmlRootElement`示例 現在來看幾個使用`@XmlRootElement`更改 XML 表示形式的示例。 #### 2.1 具有`name`屬性的`@XmlRootElement` ```java @XmlRootElement(name = "employee") @XmlAccessorType(XmlAccessType.FIELD) public class EmployeeData implements Serializable { private static final long serialVersionUID = 1L; private Integer id; private String firstName; private String lastName; } ``` 以上轉換為: ```java <employee> <id>1</id> <firstName>Lokesh</firstName> <lastName>Gupta</lastName> </employee> ``` #### 2.2 不帶`name`屬性的`@XmlRootElement` ```java @XmlRootElement @XmlAccessorType(XmlAccessType.FIELD) public class EmployeeData implements Serializable { private static final long serialVersionUID = 1L; private Integer id; private String firstName; private String lastName; } ``` 以上轉換為: ```java <EmployeeData> <id>1</id> <firstName>Lokesh</firstName> <lastName>Gupta</lastName> </EmployeeData> ``` 將我的問題放在評論部分。 學習愉快! 參考: [`XmlRootElement` Java 文檔](https://docs.oracle.com/javase/7/docs/api/javax/xml/bind/annotation/XmlRootElement.html)
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