从JDK5.0开始，Sun引进了一个全新的关键字 enum 来定义一个枚举类型，于是 JPA 中也有相应的注解来对枚举类型进行映射。

假设顾客表如下：

CREATE TABLE `customer` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(100) DEFAULT NULL,
  `state` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ak_key_2` (`name`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

相应的实体类如下：

@Entity
@Table(name = "CUSTOMER", uniqueConstraints = @UniqueConstraint(columnNames = "name"))
public class Customer extends AuditableEntity {

	private String name;//顾客名称
	private StateEnum state;//状态

	@Column(name = "name", unique = true, length = 100)
	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Column(name = "state", length = 10)
	@Enumerated(EnumType.STRING)
	public StateEnum getState() {
		return state;
	}

	public void setState(StateEnum state) {
		this.state = state;
	}

	public static enum StateEnum {
		NORMAL, DELETE;
		public String getLabel() {
			switch (this) {
			case NORMAL:
				return "正常";
			case DELETE:
				return "删除";
			}
			return super.toString();
		}
	}
}

说明：

EnumType有两个值，ORDINAL表示持久化的为枚举类型的值，STRING表示持久化的为枚举类型的名称。

@Enumerated注解的API文档说明：

http://docs.oracle.com/javaee/5/api/javax/persistence/Enumerated.html

EnumType注解的API文档说明：

http://docs.oracle.com/javaee/5/api/javax/persistence/EnumType.html

参考文档：

http://blog.csdn.net/EJB_JPA/article/details/2422684