48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
### 28.3.1. 实体类
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传统上，JPA实体类被定义到一个persistence.xml文件中。在Spring Boot中，这个文件不是必需的，并被'实体扫描'替代。默认情况下，在你主（main）配置类（被@EnableAutoConfiguration或@SpringBootApplication注解的类）下的所有包都将被查找。
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任何被@Entity，@Embeddable或@MappedSuperclass注解的类都将被考虑。一个普通的实体类看起来像下面这样：
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```java
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package com.example.myapp.domain;
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import java.io.Serializable;
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import javax.persistence.*;
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@Entity
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public class City implements Serializable {
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@Id
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@GeneratedValue
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private Long id;
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@Column(nullable = false)
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private String name;
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@Column(nullable = false)
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private String state;
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// ... additional members, often include @OneToMany mappings
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protected City() {
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// no-args constructor required by JPA spec
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// this one is protected since it shouldn't be used directly
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}
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public City(String name, String state) {
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this.name = name;
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this.country = country;
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}
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public String getName() {
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return this.name;
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}
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public String getState() {
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return this.state;
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}
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// ... etc
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}
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```
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**注**：你可以使用@EntityScan注解自定义实体扫描路径。具体参考[Section 67.4, “Separate @Entity definitions from Spring configuration”](../IX. ‘How-to’ guides/67.4. Separate @Entity definitions from Spring configuration.md)。
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