了解了以下几个注解，暂时学习的jpa只是将注解注释到mysql中，类的字段与表的字段一一对应，表可以自动生成，数据也可以自动添加
@Entity
@Transient
@Temporal
@Table
@Id
@GeneratedValue
@Column
@Basic
直接上代码
package com.huawei.test; import java.util.Date; import javax.persistence.Basic; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; import javax.persistence.Transient; import javax.xml.crypto.Data; @Table(name="JPA_CUSTOMERS") @Entity public class Customer { private Integer id; private String lastName; private String email; private int age; private Date createTime; private Date birth; //生成主键的策略 @GeneratedValue(strategy=GenerationType.AUTO) @Id public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @Column(name="LAST_NAME", length=50, nullable=false) public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } //默认是加上的 ，默认映射成数据表的一列 @Basic public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } //指定时间的类型，datetime类型，精确到秒 @Temporal(TemporalType.TIMESTAMP) public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } //指定时间的类型，date类型，精确到秒 @Temporal(TemporalType.DATE) public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } // 工具方法，不需要映射为数据表的一列 //不映射成数据表的一列 @Transient public String getInfo() { return "lastName" + this.lastName + " email:" + this.email; } }