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Springdata Jpa
Java持久化API，是Sun官方在JDK5.0后提出的Java持久化规范（JSR 338，这些接口所在包为javax.persistence，详细内容可参考https://github/javaee/jpa-spec）
JPA的出现主要是为了简化持久层开发以及整合ORM技术，结束Hibernate、TopLink、JDO等ORM框架各自为营的局面。JPA是在吸收现有ORM框架的基础上发展而来，易于使用，伸缩性强
作者：fulgens
链接：https://www.jianshu/p/c23c82a8fcfc
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
创建文件
重要代码
package com.zhongruan.news.entity;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
@Entity
@Table(name = "t_user")
public class User {
@Id
@GeneratedValue
private Long id;
private String nickname; // 昵称
private String username; // 用户名
private String password; // 密码
private String email; // 邮箱
private String avatar; // 头像的url
private Integer type; // 用户激活状态
// 由于数据库不能存储java对象 所用通过@Temporal 注解 Date对象转换成 时间戳 存储到数据库中
@Temporal(TemporalType.TIMESTAMP)
private Date createTime; // 用户创建时间
@Temporal(TemporalType.TIMESTAMP)
private Date updateTime; // 用户的更新时间
@OneToMany(mappedBy = "user")
private List<News> newsList = new ArrayList<>(); // 新闻
public User() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
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 getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAvatar() {
return avatar;
}
public void setAvatar(String avatar) {
this.avatar = avatar;
}
public Integer getType() {
return type;
}
public void setType(Integer type) {
this.type = type;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}
public List<News> getNewsList() {
return newsList;
}
public void setNewsList(List<News> newsList) {
this.newsList = newsList;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", nickname='" + nickname + '\'' +
", username='" + username + '\'' +
", password='" + password + '\'' +
", email='" + email + '\'' +
", avatar='" + avatar + '\'' +
", type=" + type +
", createTime=" + createTime +
", updateTime=" + updateTime +
'}';
}
}
spring:
thymeleaf:
mode: HTML5
# 配置数据源
datasource:
url: jdbc:mysql://localhost:3306/whlg01?serverTimezone=Asia/Shanghai&characterEnconding=utf-8
driver-class-name: com.mysql.jdbc.Driver
username: root
password: password
# JPA 的配置
jpa:
hibernate:
ddl-auto: update
show-sql: true
# 指定端口
server:
port: 8090
# 指定日志
logging:
level:
root: info
file:
path: log/blog
package com.zhongruan.news.aspects;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;
@Aspect
@Component
public class LogAspect {
// 日志记录器
private final Logger logger = LoggerFactory.getLogger(this.getClass());
/*
@Aspect 表示该类是一个切面类
*/
@Pointcut("execution(* com.zhongruan.news.web.*.*(..))")
public void log() {
/*
execution(* com.zhongruan.web.*.*(..))
* 修饰符
*/
}
@Before("log()")
public void doBefore(JoinPoint joinPoint) {
System.out.println("-----------doBefore----------");
// 将 用户访问的url ip 调用的方法 传递的参数
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
String url = request.getRequestURL().toString();
String ip = request.getRemoteAddr();
String classMethod = joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName();
Object[] args = joinPoint.getArgs();
RequestLog requestLog = new RequestLog(url, ip, classMethod, args);
logger.info("Result: {}", requestLog);
}
@After("log()")
public void doAfter() {
System.out.println("-----------doAfter----------");
}
@AfterReturning(returning = "result", pointcut = "log()")
public void doAfterReturn(Object result) {
logger.info("Result:{}", result);
}
private class RequestLog {
private String url;
private String ip;
private String classMethod;
private Object[] args;
public RequestLog() {
}
public RequestLog(String url, String ip, String classMethod, Object[] args) {
this.url = url;
this.ip = ip;
this.classMethod = classMethod;
this.args = args;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public String getClassMethod() {
return classMethod;
}
public void setClassMethod(String classMethod) {
this.classMethod = classMethod;
}
public Object[] getArgs() {
return args;
}
public void setArgs(Object[] args) {
this.args = args;
}
@Override
public String toString() {
return "RequestLog{" +
"url='" + url + '\'' +
", ip='" + ip + '\'' +
", classMethod='" + classMethod + '\'' +
", args=" + Arrays.toString(args) +
'}';
}
}
}
package com.zhongruan.news.entity;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
@Entity
@Table(name = "t_news")
public class News {
@Id
@GeneratedValue
private Long id;
private String title; // 新闻标题
private String content; // 新闻内容
private String firstPicture; // 新闻图片的url
private String flag; // 新闻状态
private Integer views; // 新闻的浏览次数
private boolean appreciation; // 新闻的赞赏功能
private boolean shareStatement; // 新闻的转载许可
private boolean commentabled; // 新闻的评论许可
private boolean published; // 新闻的发布
private boolean recommend; // 新闻是否推荐
@Temporal(TemporalType.TIMESTAMP)
private Date createTime; // 新闻创建时间
@Temporal(TemporalType.TIMESTAMP)
private Date updateTime; // 新闻的更新时间
@ManyToOne
private Type type; // 新闻的类型
@ManyToMany(cascade = {CascadeType.PERSIST})
private List<Tag> tags = new ArrayList<>(); // 新闻的标签
@ManyToOne
private User user; // 新闻的作者
@OneToMany(mappedBy = "news")
private List<Comment> comments = new ArrayList<>(); // 新闻的评论
@Transient
private String tagIds;
private String description;
public News() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getFirstPicture() {
return firstPicture;
}
public void setFirstPicture(String firstPicture) {
this.firstPicture = firstPicture;
}
public String getFlag() {
return flag;
}
public void setFlag(String flag) {
this.flag = flag;
}
public Integer getViews() {
return views;
}
public void setViews(Integer views) {
this.views = views;
}
public boolean isAppreciation() {
return appreciation;
}
public void setAppreciation(boolean appreciation) {
this.appreciation = appreciation;
}
public boolean isShareStatement() {
return shareStatement;
}
public void setShareStatement(boolean shareStatement) {
this.shareStatement = shareStatement;
}
public boolean isCommentabled() {
return commentabled;
}
public void setCommentabled(boolean commentabled) {
thismentabled = commentabled;
}
public boolean isPublished() {
return published;
}
public void setPublished(boolean published) {
this.published = published;
}
public boolean isRecommend() {
return recommend;
}
public void setRecommend(boolean recommend) {
this.recommend = recommend;
}
public Date getCreateTime() {
return createTime;
}
public void setCreateTime(Date createTime) {
this.createTime = createTime;
}
public Date getUpdateTime() {
return updateTime;
}
public void setUpdateTime(Date updateTime) {
this.updateTime = updateTime;
}
public Type getType() {
return type;
}
public void setType(Type type) {
this.type = type;
}
public List<Tag> getTags() {
return tags;
}
public void setTags(List<Tag> tags) {
this.tags = tags;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public List<Comment> getComments() {
return comments;
}
public void setComments(List<Comment> comments) {
thisments = comments;
}
public String getTagIds() {
return tagIds;
}
public void setTagIds(String tagIds) {
this.tagIds = tagIds;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public void init() {
this.tagIds = tagsToIds(this.getTags());
}
//1,2,3
private String tagsToIds(List<Tag> tags) {
if (!tags.isEmpty()) {
StringBuffer ids = new StringBuffer();
boolean flag = false;
for (Tag tag : tags) {
if (flag) {
ids.append(",");
} else {
flag = true;
}
ids.append(tag.getId());
}
return ids.toString();
} else {
return tagIds;
}
}
@Override
public String toString() {
return "News{" +
"id=" + id +
", title='" + title + '\'' +
", content='" + content + '\'' +
", firstPicture='" + firstPicture + '\'' +
", flag='" + flag + '\'' +
", views=" + views +
", appreciation=" + appreciation +
", shareStatement=" + shareStatement +
", commentabled=" + commentabled +
", published=" + published +
", recommend=" + recommend +
", createTime=" + createTime +
", updateTime=" + updateTime +
", type=" + type +
", tags=" + tags +
", user=" + user +
", comments=" + comments +
", tagIds='" + tagIds + '\'' +
", description='" + description + '\'' +
'}';
}
public void initTags(Long id) {
//3,4,5
List<Tag> tags = this.getTags();
StringBuffer ids=new StringBuffer();
if(!tags.isEmpty()){
Boolean flag=false;
for(Tag t:tags){
if(flag){
ids.append(t.getId());
flag=true;
}else {
ids.append(",");
ids.append(t.getId());
}
}
this.setTagIds(ids.toString());
}
}
}
结果
本文标签： SpringDatajpa
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