我想使用Spring Rest接口公开所有ID。
我知道默认情况下,这样的ID不会通过其余界面公开:
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(unique=true, nullable=false)
private Long id;
我知道我可以使用它来公开User
的ID:
@Configuration
public class RepositoryConfig extends RepositoryRestMvcConfiguration {
@Override
protected void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
config.exposeIdsFor(User.class);
}
}
但有没有一种简单的方法来公开所有ID而无需在此configureRepositoryRestConfiguration
方法中手动维护列表?
目前,SDR无法做到这一点。 SDR Jira跟踪器上的This issue给出了一些解释,说明为什么不能(也许不应该)这样做。
参数基本上是因为ID已经包含在响应中的self
链接中,所以您不需要将它们作为对象本身的属性公开。
也就是说,您可以使用反射来检索具有javax.persistence.Id
注释的所有类,然后调用RepositoryRestConfiguration#exposeIdsFor(Class<?>... domainTypes)
。
以下代码看起来更漂亮:
.exposeIdsFor(entityManager.getMetamodel().getEntities().stream().map(entityType -> entityType.getJavaType()).toArray(Class[]::new))
您可以尝试使用此解决方案: - 首先将reflections库导入您的POM文件:
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.9.11</version>
</dependency>
- 然后将RepositoryConfig类更改为:
@Configuration
public class RepositoryConfig extends RepositoryRestMvcConfiguration {
@Override
protected void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
Reflections reflections = new Reflections("com.example.entity");
Set<Class<?>> idExposedClasses = reflections.getTypesAnnotatedWith(Entity.class, false);
idExposedClasses.forEach(config::exposeIdsFor);
return config;
}
}
将“com.example.entity”更改为您的Entity包,您就可以了。祝好运!
我发现,如果你命名@Id
字段'Id
',如果你有Id
的公共吸气剂,它将显示在JSON中。 Id将显示为名为“id
”的JSON密钥
例如:@Id @Column(name="PERSON_ROLE_ID") private Long Id;
这也适用于称为'@EmbeddedId
'的Id
领域,只要它有公共吸气剂。在这种情况下,Id的字段将显示为JSON对象。
例如:@EmbeddedId private PrimaryKey Id;
令人惊讶的是,这是区分大小写的,调用id'id
'不起作用,即使它是Java字段的更常规名称。
我应该说我完全意外地发现了这一点,所以我不知道这是否是一个公认的约定,或者是否适用于Spring Data和REST的早期版本或未来版本。所以我把我的maven pom的相关部分包括在内,只是因为它对版本有敏感性......
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
<version>12.1.0.2</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
</dependencies>
如果要公开所有实体类的id字段:
import java.util.stream.Collectors;
import javax.persistence.EntityManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.rest.core.config.RepositoryRestConfiguration;
import org.springframework.data.rest.webmvc.config.RepositoryRestConfigurerAdapter;
@Configuration
public class MyRepositoryRestConfigurerAdapter extends RepositoryRestConfigurerAdapter {
@Autowired
private EntityManager entityManager;
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
config.exposeIdsFor(entityManager.getMetamodel().getEntities().stream().map(e -> e.getJavaType()).collect(Collectors.toList()).toArray(new Class[0]));
}
}
您可以使用此方法查找EntityManagerFactory的所有@Entity
类:
private List<Class<?>> getAllManagedEntityTypes(EntityManagerFactory entityManagerFactory) {
List<Class<?>> entityClasses = new ArrayList<>();
Metamodel metamodel = entityManagerFactory.getMetamodel();
for (ManagedType<?> managedType : metamodel.getManagedTypes()) {
Class<?> javaType = managedType.getJavaType();
if (javaType.isAnnotationPresent(Entity.class)) {
entityClasses.add(managedType.getJavaType());
}
}
return entityClasses;
}
然后,公开所有实体类的ID:
@Configuration
public class RestConfig extends RepositoryRestMvcConfiguration {
@Bean
public RepositoryRestConfigurer repositoryRestConfigurer(EntityManagerFactory entityManagerFactory) {
List<Class<?>> entityClasses = getAllManagedEntityTypes(entityManagerFactory);
return new RepositoryRestConfigurerAdapter() {
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
for (Class<?> entityClass : entityClasses) {
config.exposeIdsFor(entityClass);
}
}
}
}
试试这个配置。它对我来说非常好。
@Configuration
public class RestConfiguration extends RepositoryRestConfigurerAdapter{
@PersistenceContext
private EntityManager entityManager;
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
//TODO: Expose for specific entity!
//config.exposeIdsFor(Officer.class);
//config.exposeIdsFor(Position.class);
//TODO: Expose id for all entities!
entityManager.getMetamodel().getEntities().forEach(entity->{
try {
System.out.println("Model: " + entity.getName());
Class<? extends Object> clazz = Class.forName(String.format("yourpackage.%s", entity.getName()));
config.exposeIdsFor(clazz);
} catch (Exception e) {
System.out.println(e.getMessage());
}
});
}
}
可能你可以尝试这包括所有id字段。我还没有尝试过,但会继续发布。
public class ExposeAllRepositoryRestConfiguration extends RepositoryRestConfiguration {
@Override
public boolean isIdExposedFor(Class<?> domainType) {
return true;
}
}
您可以通过exposeIdsFor添加所有实体类。将“db.entity”替换为您放置实体的包。
@Configuration
public class CustomRepositoryRestConfigurer extends RepositoryRestConfigurerAdapter {
Logger logger = Logger.getLogger(this.getClass());
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
Set<String> classNameSet = ClassTool.getClassName("db.entity", false);
for (String className : classNameSet) {
try {
config.exposeIdsFor(Class.forName(className));
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
logger.info("exposeIdsFor : " + classNameSet);
}
}
ClassTool是我从给定包中获取类的自定义函数,您可以自己编写。
这对我来说是完美的(source here):
@Configuration
public class RepositoryRestConfig extends RepositoryRestConfigurerAdapter {
@Override
public void configureRepositoryRestConfiguration(final RepositoryRestConfiguration config) {
final ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(
false);
provider.addIncludeFilter(new AnnotationTypeFilter(Entity.class));
final Set<BeanDefinition> beans = provider.findCandidateComponents("com.your.domain");
for (final BeanDefinition bean : beans) {
try {
config.exposeIdsFor(Class.forName(bean.getBeanClassName()));
} catch (final ClassNotFoundException e) {
// Can't throw ClassNotFoundException due to the method signature. Need to cast it
throw new IllegalStateException("Failed to expose `id` field due to", e);
}
}
}
}
它找到所有带有@Entity注释的bean并公开它们。
请为此找到一个简单的解决方案,避免找到相关的实体。
@Component
public class EntityExposingIdConfiguration extends RepositoryRestConfigurerAdapter {
@Override
public void configureRepositoryRestConfiguration(RepositoryRestConfiguration config) {
try {
Field exposeIdsFor = RepositoryRestConfiguration.class.getDeclaredField("exposeIdsFor");
exposeIdsFor.setAccessible(true);
ReflectionUtils.setField(exposeIdsFor, config, new ListAlwaysContains());
} catch (NoSuchFieldException e) {
e.printStackTrace();
}
}
class ListAlwaysContains extends ArrayList {
@Override
public boolean contains(Object o) {
return true;
}
}
}