JPA如何设置表名和实体名,表字段与实体字段的对应

<prop key="hibernate.hbm2ddl.auto">update</prop>

package com.shiroweb.entitys; 
import java.util.Date; 
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
 
@Entity
@Table(name="shiro_user")//设置数据库中表名字
public class ShiroUser {
 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;
 @Column(name="USER_NAME")<span style="font-family: Arial, Helvetica, sans-serif;">//设置数据库中字段名字，也可以设置长度，是否为空等属性</span>
 private String username;
 @Column(name="PASS_WORD")
 private String password;
 @Column(name="CREATE_DATE")
 private Date createDate;
 @Column(name="USER_ID")
 private String userId; 
 public String getUserId() {
  return userId;
 }
 
 public void setUserId(String userId) {
  this.userId = userId;
 }
 
 public Long getId() {
  return id;
 }
 
 public void setId(Long id) {
  this.id = id;
 }
 
 public String getUsername() {
  return username;
 }
 
 public void setUsername(String username) {
  this.username = username;
 }
 
 public String getPassword() {
  return password;
 }
 
 public void setPassword(String password) {
  this.password = password;
 }
 
 public Date getCreateDate() {
  return createDate;
 }
 
 public void setCreateDate(Date createDate) {
  this.createDate = createDate;
 } 
}