Spring date jpa onetoone的问题，有关一对一外键的写法

 最近在写spring boot项目的时候遇到了有关spring date jpa的一些问题，其中对@OneToOne，一对一外键的设置不怎么理解，百度了很多都不成功，最后通过查阅资料看到了如何来写这个一对一的外键，话不多说，直接上代码。

package com.b505.entity;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

/**
 * 

 * B505信息科学研究所
 * 
 * 
 * @Description 用户个人信息实体
 * @Creat date 2018-9-5 21:18
 * @author yulin
 */
@Entity
@Table(name = "userinfo")
public class Userinfo {
	@Id
	@GeneratedValue(generator = "a_native")
	// 指定主键生成策略，默认为自增
	@GenericGenerator(name = "a_native", strategy = "native")
	private int userid;
	private String username;
	private String password;
	private String telephone;
	private String truename;
	private String schoolname;
	private String classnumber;
	private String studeynumber;
	// 外键
	
	// @OneToOne(fetch=FetchType.LAZY,cascade = CascadeType.ALL) 
	// referencedColumnName：参考列名,默认的情况下是列表的主键
	// nullable=是否可以为空，
	// insertable：是否可以插入，
	// updatable：是否可以更新
	// columnDefinition=列定义，
	// foreignKey=外键
	// @JoinColumn(name="open_id",referencedColumnName="id",nullable=false)
	// private SNSUserInfo sNSUserInfo;

	

	public int getUserid() {
		return userid;
	}

	public void setUserId(int userid) {
		this.userid = userid;
	}

	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 String getTelephone() {
		return telephone;
	}

	public void setTelephone(String telephone) {
		this.telephone = telephone;
	}

	public String getTruename() {
		return truename;
	}

	public void setTruename(String truename) {
		this.truename = truename;
	}

	public String getSchoolname() {
		return schoolname;
	}

	public void setSchoolname(String schoolname) {
		this.schoolname = schoolname;
	}

	public String getClassnumber() {
		return classnumber;
	}

	public void setClassnumber(String classnumber) {
		this.classnumber = classnumber;
	}

	public String getStudeynumber() {
		return studeynumber;
	}

	public void setStudeynumber(String studeynumber) {
		this.studeynumber = studeynumber;
	}

	// @OneToOne(mappedBy="snsuser_info")
	// @JoinColumn(name="open_id")

	@Override
	public String toString() {

		return "username= " + username + "password= " + password
				+ "telephone= " + telephone + "truename=" + truename
				+ "schoolname=" + schoolname + "classnumber=" + classnumber
				+ "studynumber=" + studeynumber;

	}

}

package com.b505.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

/**
 * 通过网页授权查找用户的信息
 * @author yulin
 * @date 2018-4-4 21：46
 */

@Entity
@Table(name="snsuser_info")
public class SNSUserInfo {
	@Id
	@GeneratedValue(generator = "a_native") //指定主键生成策略，默认为自增
	@GenericGenerator(name = "a_native",strategy= "native")
	private int id;
	//用户标识
	private String openId;
	//用户昵称
	private String nickname;
	//性别 （1是男性 2是女性 3是未知）
	private int sex;
	//国家
	private String country;
	//省份
	private String province;
	//城市
	private String city;
	//用户头像链接
	private String headImgUrl;
	@OneToOne
	@JoinColumn(name="userid")
	private Userinfo userinfo;
	
	public Userinfo getUserinfo() {
		return userinfo;
	}
	public void setUserinfo(Userinfo userinfo) {
		this.userinfo = userinfo;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getOpenId() {
		return openId;
	}
	public void setOpenId(String openId) {
		this.openId = openId;
	}
	public String getNickname() {
		return nickname;
	}
	public void setNickname(String nickname) {
		this.nickname = nickname;
	}
	public int getSex() {
		return sex;
	}
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
	public String getProvince() {
		return province;
	}
	public void setProvince(String province) {
		this.province = province;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getHeadImgUrl() {
		return headImgUrl;
	}
	public void setHeadImgUrl(String headImgUrl) {
		this.headImgUrl = headImgUrl;
	}
     
	     @Override
	     public String toString(){
	    	 
	    	 return "openId="+openId+"nickname="+nickname+"sex="+sex+"country="+country+"province="+province+"city="+city+"headImgUrl="+headImgUrl;
	     }
	    public SNSUserInfo(String openId, String nickname, int sex, String country,
					String province, String city, String headImgUrl
					) {
				super();
				this.openId = openId;
				this.nickname = nickname;
				this.sex = sex;
				this.country = country;
				this.province = province;
				this.city = city;
				this.headImgUrl = headImgUrl;
			}
		     public SNSUserInfo(){
		    	 
		     }
		public void setSex(int int1) {
			// TODO Auto-generated method stub
			
		}
}

 spring boot项目于的dao层 和service层这里就不在过多的去写了，直接写一个controller层，实现一对一存储信息的操作。

package com.b505.controller;

import net.sf.json.JSONObject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.b505.entity.SNSUserInfo;
import com.b505.entity.Userinfo;
import com.b505.service.SNSUserinfoService;
import com.b505.service.UserinfoService;

/**
 * 
b505信息科学研究所
 * @Description 保存注册用户信息，并回应ajax的success
 * @Creat date 2018-9-10 20:04
 * @author yulin
 *
 */

@Controller
public class RegisterClController {

	@Autowired
	private UserinfoService userinfoService;
	@Autowired
	private SNSUserinfoService sNSUserinfoService;
	
	@ResponseBody
	@RequestMapping(value = "/Register/aa", method = RequestMethod.POST, produces = "application/json;charset=UTF-8")
	public int getByJSON( @RequestBody JSONObject jsonParam) {
	    // 直接将json信息打印出来
	    System.out.println("---------开始-----------");
	    
	    // 将获取的json数据封装一层，然后在给返回
	    /*JSONObject result = new JSONObject();
	    result.put("msg", "ok");
	    result.put("method", "json");
	    result.put("data", jsonParam);

	    return result.toString();*/ 
			
	    	Userinfo userinfo=new Userinfo();
	    	//用户名
	    	userinfo.setUsername(jsonParam.getString("username"));
	    	//用户密码
	    	userinfo.setPassword(jsonParam.getString("password"));
	    	//用户真实姓名
	    	userinfo.setTruename(jsonParam.getString("truename"));
	    	//用户学校名称
	    	userinfo.setSchoolname(jsonParam.getString("schoolname"));
	    	//用户班级
	    	userinfo.setClassnumber(jsonParam.getString("classnumber"));
	    	//用户学号
	    	userinfo.setStudeynumber(jsonParam.getString("studynumber"));
	    	//用户手机号
	    	userinfo.setTelephone(jsonParam.getString("telephone"));
	    	
	    	System.out.println(userinfo);
	    	
	    	
	    	SNSUserInfo sNSUserInfo=new SNSUserInfo();
	    	
	    	long i=sNSUserinfoService.count();
	    	int id;
	    	id=(int)i;
	    	System.out.println("******************"+id);
	    	
	    	sNSUserInfo=sNSUserinfoService.findById(id);
	    	
	    	System.out.println("--------------------sNSUserInfo="+sNSUserInfo);
	    	
	    	sNSUserInfo.setUserinfo(userinfo);
	    		    	
	    	userinfoService.save(userinfo);
	    	
	    		    
	    
	    return 1;
	    
	}
	
	
	
}