警惕自己这个知识点：
import javax.persistence.*; @Entity @Table(name="animal") @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)//设置了这个后，主键就不能采用默认设置 public class Animal { @Id @GeneratedValue(strategy=GenerationType.TABLE) private Integer id; private String name; private Integer foot; public Animal(String name, Integer foot) { super(); this.name = name; this.foot = foot; } public Animal() { super(); } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getFoot() { return foot; } public void setFoot(Integer foot) { this.foot = foot; } }