转自：https://blog.csdn.net/he90227/article/details/44783099
开发应用程序的过程中，经常会对一些比较重要的数据修改都需要写日志。在实际工作的工程中，这些数据都是存在表中的, 一个常见的做法是用触发器，在增删改的时候，用触发器将数据写入到另一张表中去，但个人不推荐这么做，原因如下:
1. 如果有多个表，得写很多触发器。
2. 触发器与数据库特性关联太紧，不同的数据库，虽然思路一样，但语法却不太一样。
对数据库表操作的日志记录，完全可以利用Hibernate的Interceptor特性来实现，也就是拦截器。下面用一个具体的例子来说明如何使用Hibernate的Interceptor。
创建一个表，用来记录日志的表
Create TABLE `auditlog` (
`AUDIT_LOG_ID` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
`ACTION` VARCHAR(100) NOT NULL,
`DETAIL` text NOT NULL,
`CreateD_DATE` DATE NOT NULL,
`ENTITY_ID` BIGINT(20) UNSIGNED NOT NULL,
`ENTITY_NAME` VARCHAR(255) NOT NULL,
PRIMARY KEY (`AUDIT_LOG_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;
创建这个表对应的实体类:
@Entity
@Table(name = "auditlog")
public class AuditLog implements java.io.Serializable {
private Long auditLogId;
private String action;
private String detail;
private Date createdDate;
private long entityId;
private String entityName;
public AuditLog() {
}
public AuditLog(String action, String detail, Date createdDate,
long entityId, String entityName) {
this.action = action;
this.detail = detail;
this.createdDate = createdDate;
this.entityId = entityId;
this.entityName = entityName;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "AUDIT_LOG_ID", unique = true, nullable = false)
public Long getAuditLogId() {
return this.auditLogId;
}
.... 余下部分可以参考提供下载的源代码.
创建一个接口，所有实现了这个接口的实体类，都会写日志
package com.mkyong.interceptor;
//market interface
public interface IAuditLog {
public Long getId();
public String getLogDeatil();
}
这里有两个方法,getId,getLogDetail 需要实现类去实现具体的方法，也就是要被写入到日志表中的详细记录.
创建一个类实现了IAuditLog 接口，并给出接口方法的具体实现
@Entity
@Table(name="stock")
public class Stock implements java.io.Serializable,IAuditLog {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="STOCK_ID")
private Integer stockId;
@Column(name="STOCK_CODE", length=10)
private String stockCode;
@Column(name="STOCK_NAME", length=20)
private String stockName;
public Stock() {
}
public Stock(String stockCode, String stockName) {
this.stockCode = stockCode;
this.stockName = stockName;
}
....省略部分getter,setter。
@Transient
public Long getId(){
return this.stockId.longValue();
}
@Transient
public String getLogDeatil(){
StringBuilder sb = new StringBuilder();
sb.append(" Stock Id : ").append(stockId)
.append(" Stock Code : ").append(stockCode)
.append(" Stock Name : ").append(stockName);
return sb.toString();
}
}
创建记录日志的工具类，所有写日志公用
public class AuditLogUtil{
public static void LogIt(String action,
IAuditLog entity){
Session tempSession = HibernateUtil.getSessionFactory().openSession();
try {
tempSession.getTransaction().begin();
AuditLog auditRecord = new AuditLog(action,entity.getLogDeatil()
, new Date(),entity.getId(), entity.getClass().toString());
tempSession.save(auditRecord);
tempSession.getTransaction().commit();
} finally {
tempSession.close();
}
}
}
创建 Hibernate interceptor 拦截器，这是重点，这里拦截所有需要记录日志的类,并处理
public class AuditLogInterceptor extends EmptyInterceptor{
Session session;
private Set inserts = new HashSet();
private Set updates = new HashSet();
private Set deletes = new HashSet();
public void setSession(Session session) {
this.session=session;
}
@Override
public String onPrepareStatement(String sql) {
System.out.println("execute sql: " + sql);
return super.onPrepareStatement(sql);
}
public boolean onSave(Object entity,Serializable id,
Object[] state,String[] propertyNames,Type[] types)
throws CallbackException {
System.out.println("onSave");
if (entity instanceof IAuditLog){
inserts.add(entity);
}
return false;
}
public boolean onFlushDirty(Object entity,Serializable id,
Object[] currentState,Object[] previousState,
String[] propertyNames,Type[] types)
throws CallbackException {
System.out.println("onFlushDirty");
if (entity instanceof IAuditLog){
updates.add(entity);
}
return false;
}
public void onDelete(Object entity,