Hibernate Log4j日志记录

 

Hibernate Log4j日志记录

 

欢迎来到Hibernate Log4j Logging示例。Hibernate 4在旧的hibernate版本中使用JBoss日志而不是slf4j。今天我们将研究如何在hibernate应用程序中配置log4j。

目录[ 隐藏 ]

• 1 Hibernate Log4j日志记录
  • 1.1 Hibernate Log4j Maven依赖项
  • 1.2 Log4j配置文件
  • 1.3休眠配置文件
  • 1.4 Hibernate SessionFactory实用程序类
  • 1.5模型类
  • 1.6 Hibernate Log4j日志测试类

Hibernate Log4j日志记录

在Eclipse或您喜欢的IDE中创建一个maven项目，最终的项目结构将如下图所示。

让我们逐个研究每个组件。

 

Hibernate Log4j Maven依赖项

我们的项目中需要hibernate-core，mysql驱动程序和log4j依赖项，我们的最终pom.xml文件如下所示。

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0modelVersion>
  <groupId>com.journaldev.hibernategroupId>
  <artifactId>HibernateLog4JExampleartifactId>
  <version>0.0.1-SNAPSHOTversion>
  <dependencies>
  	<dependency>
  		<groupId>org.hibernategroupId>
  		<artifactId>hibernate-coreartifactId>
  		<version>4.3.5.Finalversion>
  	dependency>
  	<dependency>
  		<groupId>log4jgroupId>
  		<artifactId>log4jartifactId>
  		<version>1.2.16version>
  	dependency>
  	<dependency>
  		<groupId>mysqlgroupId>
  		<artifactId>mysql-connector-javaartifactId>
  		<version>5.0.5version>
  	dependency>
  dependencies>
project>

Log4j配置文件

我使用基于XML的log4j配置，我们也可以使用基于属性文件的配置。

 

log4j.xml

xml version="1.0" encoding="UTF-8"?>


<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"
	debug="false">

	
	<appender name="FILE" class="org.apache.log4j.RollingFileAppender">
		<param name="File" value="logs/system.log" />
		<param name="Append" value="true" />
		<param name="ImmediateFlush" value="true" />
		<param name="MaxFileSize" value="200MB" />
		<param name="MaxBackupIndex" value="100" />

		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d %d{Z} [%t] %-5p (%F:%L) - %m%n" />
		layout>
	appender>

	<appender name="journaldev-hibernate" class="org.apache.log4j.RollingFileAppender">
		<param name="File" value="logs/project.log" />
		<param name="Append" value="true" />
		<param name="ImmediateFlush" value="true" />
		<param name="MaxFileSize" value="200MB" />
		<param name="MaxBackupIndex" value="50" />

		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d %d{Z} [%t] %-5p (%F:%L) - %m%n" />
		layout>
	appender>

	<logger name="com.journaldev.hibernate" additivity="false">
		<level value="DEBUG" />
		<appender-ref ref="journaldev-hibernate" />
	logger>

	<logger name="org.hibernate" additivity="false">
		<level value="INFO" />
		<appender-ref ref="FILE" />
	logger>
	<root>
		<priority value="INFO">priority>
		<appender-ref ref="FILE" />
	root>

log4j:configuration>

此文件需要放在根文件夹中，以便我们的主类可以访问它。注意log4j日志文件的位置，我们的应用程序生成的日志将进入project.log，而hibernate日志将进入system.log文件。

休眠配置文件

我们的hibernate配置xml如下所示。

hibernate.cfg.xml

xml version="1.0" encoding="UTF-8"?>

<hibernate-configuration>
	<session-factory>
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driverproperty>
		<property name="hibernate.connection.password">pankaj123property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost/TestDBproperty>
		<property name="hibernate.connection.username">pankajproperty>
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialectproperty>

		<property name="hibernate.current_session_context_class">threadproperty>
		<property name="hibernate.show_sql">trueproperty>

		<mapping class="com.journaldev.hibernate.model.Employee" />
		<mapping class="com.journaldev.hibernate.model.Address" />
	session-factory>
hibernate-configuration>

Hibernate SessionFactory实用程序类

package com.journaldev.hibernate.util;

import org.apache.log4j.Logger;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil {

	private static SessionFactory sessionFactory;
	
	private static Logger logger = Logger.getLogger(HibernateUtil.class);

	private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
        	Configuration configuration = new Configuration();
        	configuration.configure("hibernate.cfg.xml");
        	logger.info("Hibernate Configuration loaded");
        	
        	ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        	logger.info("Hibernate serviceRegistry created");
        	
        	SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        	
            return sessionFactory;
        }
        catch (Throwable ex) {
            logger.error("Initial SessionFactory creation failed." + ex);
            ex.printStackTrace();
            throw new ExceptionInInitializerError(ex);
        }
    }
	
	public static SessionFactory getSessionFactory() {
		if(sessionFactory == null) sessionFactory = buildSessionFactory();
        return sessionFactory;
    }
}

请注意，我使用log4j Logger进行日志记录，因为此类是我们的应用程序的一部分，日志应该进入project.log文件。

模型类

我们有两个模型类 - 员工和地址。我使用与HQL示例中相同的数据库设置，因此您可以检查该教程以查看数据库设置和模型类。这两个类都是简单的java bean，基于hibernate注释的映射。

Hibernate Log4j日志测试类

我们的主要课程如下所示。

 

package com.journaldev.hibernate.main;

import java.util.List;

import org.apache.log4j.Logger;
import org.apache.log4j.xml.DOMConfigurator;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

import com.journaldev.hibernate.model.Employee;
import com.journaldev.hibernate.util.HibernateUtil;

public class HibernateLog4jExample {

	static{
		System.out.println("Before log4j configuration");
		DOMConfigurator.configure("log4j.xml");
		System.out.println("After log4j configuration");
	}
	
	private static Logger logger = Logger.getLogger(HibernateLog4jExample.class);
	
	@SuppressWarnings("unchecked")
	public static void main(String[] args) {
		
		//Prep work
		SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
		Session session = sessionFactory.getCurrentSession();
		
		//Get All Employees
		Transaction tx = session.beginTransaction();
		Query query = session.createQuery("from Employee");
		List empList = query.list();
		for(Employee emp : empList){
			logger.info("List of Employees::"+emp.getId()+","+emp.getAddress().getCity());
		}
		
		tx.commit();
		sessionFactory.close();
		logger.info("DONE");
	}

}

请注意，我们不需要执行任何操作来插入log4j日志记录。显然我们需要在使用之前先配置它，这就是为什么我在开始使用之前使用静态块来确保配置log4j的原因。我正在使用org.apache.log4j.xml.DOMConfigurator因为我们的log4j配置是基于XML的，如果你有基于属性文件的配置，你应该使用org.apache.log4j.PropertyConfiguratorclass。

现在当我们执行上面的程序时，我们在log4j文件中获得以下数据。

project.log

2014-06-05 20:00:11,868 -0700 [main] INFO  (HibernateUtil.java:20) - Hibernate Configuration loaded
2014-06-05 20:00:11,936 -0700 [main] INFO  (HibernateUtil.java:23) - Hibernate serviceRegistry created
2014-06-05 20:00:12,698 -0700 [main] INFO  (HibernateLog4jExample.java:37) - List of Employees::1,San Jose
2014-06-05 20:00:12,698 -0700 [main] INFO  (HibernateLog4jExample.java:37) - List of Employees::2,Santa Clara
2014-06-05 20:00:12,698 -0700 [main] INFO  (HibernateLog4jExample.java:37) - List of Employees::3,Bangalore
2014-06-05 20:00:12,698 -0700 [main] INFO  (HibernateLog4jExample.java:37) - List of Employees::4,New Delhi
2014-06-05 20:00:12,712 -0700 [main] INFO  (HibernateLog4jExample.java:42) - DONE

请注意，上面的日志文件只包含我们程序生成的条目，这样我们就可以将应用程序日志与hibernate日志分开。

system.log

2014-06-05 22:49:58,415 -0700 [main] INFO  (JavaReflectionManager.java:66) - HCANN000001: Hibernate Commons Annotations {4.0.4.Final}
2014-06-05 22:49:58,423 -0700 [main] INFO  (Version.java:54) - HHH000412: Hibernate Core {4.3.5.Final}
2014-06-05 22:49:58,426 -0700 [main] INFO  (Environment.java:239) - HHH000206: hibernate.properties not found
2014-06-05 22:49:58,427 -0700 [main] INFO  (Environment.java:346) - HHH000021: Bytecode provider name : javassist
2014-06-05 22:49:58,446 -0700 [main] INFO  (Configuration.java:2073) - HHH000043: Configuring from resource: hibernate.cfg.xml
2014-06-05 22:49:58,447 -0700 [main] INFO  (Configuration.java:2092) - HHH000040: Configuration resource: hibernate.cfg.xml
2014-06-05 22:49:58,491 -0700 [main] INFO  (Configuration.java:2214) - HHH000041: Configured SessionFactory: null
2014-06-05 22:49:58,557 -0700 [main] WARN  (DriverManagerConnectionProviderImpl.java:93) - HHH000402: Using Hibernate built-in connection pool (not for production use!)
2014-06-05 22:49:58,560 -0700 [main] INFO  (DriverManagerConnectionProviderImpl.java:166) - HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost/TestDB]
2014-06-05 22:49:58,561 -0700 [main] INFO  (DriverManagerConnectionProviderImpl.java:175) - HHH000046: Connection properties: {user=pankaj, password=****}
2014-06-05 22:49:58,561 -0700 [main] INFO  (DriverManagerConnectionProviderImpl.java:180) - HHH000006: Autocommit mode: false
2014-06-05 22:49:58,562 -0700 [main] INFO  (DriverManagerConnectionProviderImpl.java:102) - HHH000115: Hibernate connection pool size: 20 (min=1)
2014-06-05 22:49:58,699 -0700 [main] INFO  (Dialect.java:145) - HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
2014-06-05 22:49:58,706 -0700 [main] INFO  (LobCreatorBuilder.java:97) - HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
2014-06-05 22:49:58,828 -0700 [main] INFO  (TransactionFactoryInitiator.java:62) - HHH000399: Using default transaction strategy (direct JDBC transactions)
2014-06-05 22:49:58,832 -0700 [main] INFO  (ASTQueryTranslatorFactory.java:47) - HHH000397: Using ASTQueryTranslatorFactory
2014-06-05 22:49:59,207 -0700 [main] INFO  (DriverManagerConnectionProviderImpl.java:281) - HHH000030: Cleaning up connection pool [jdbc:mysql://localhost/TestDB]

由于我们的hibernate日志级别设置为INFO模式，因此日志不多。如果您将其更改为调试，即使这个简单的程序也会生成超过1400行的日志。分析这些日志有时候很难理解hibernate如何在内部工作以及调试与hibernate相关的问题。

此外，我们在控制台中生成了以下日志。

Before log4j configuration
After log4j configuration
Hibernate: select employee0_.emp_id as emp_id1_1_, employee0_.emp_name as emp_name2_1_, employee0_.emp_salary as emp_sala3_1_ from EMPLOYEE employee0_
Hibernate: select address0_.emp_id as emp_id1_0_0_, address0_.address_line1 as address_2_0_0_, address0_.city as city3_0_0_, address0_.zipcode as zipcode4_0_0_, employee1_.emp_id as emp_id1_1_1_, employee1_.emp_name as emp_name2_1_1_, employee1_.emp_salary as emp_sala3_1_1_ from ADDRESS address0_ left outer join EMPLOYEE employee1_ on address0_.emp_id=employee1_.emp_id where address0_.emp_id=?
Hibernate: select address0_.emp_id as emp_id1_0_0_, address0_.address_line1 as address_2_0_0_, address0_.city as city3_0_0_, address0_.zipcode as zipcode4_0_0_, employee1_.emp_id as emp_id1_1_1_, employee1_.emp_name as emp_name2_1_1_, employee1_.emp_salary as emp_sala3_1_1_ from ADDRESS address0_ left outer join EMPLOYEE employee1_ on address0_.emp_id=employee1_.emp_id where address0_.emp_id=?
Hibernate: select address0_.emp_id as emp_id1_0_0_, address0_.address_line1 as address_2_0_0_, address0_.city as city3_0_0_, address0_.zipcode as zipcode4_0_0_, employee1_.emp_id as emp_id1_1_1_, employee1_.emp_name as emp_name2_1_1_, employee1_.emp_salary as emp_sala3_1_1_ from ADDRESS address0_ left outer join EMPLOYEE employee1_ on address0_.emp_id=employee1_.emp_id where address0_.emp_id=?
Hibernate: select address0_.emp_id as emp_id1_0_0_, address0_.address_line1 as address_2_0_0_, address0_.city as city3_0_0_, address0_.zipcode as zipcode4_0_0_, employee1_.emp_id as emp_id1_1_1_, employee1_.emp_name as emp_name2_1_1_, employee1_.emp_salary as emp_sala3_1_1_ from ADDRESS address0_ left outer join EMPLOYEE employee1_ on address0_.emp_id=employee1_.emp_id where address0_.emp_id=?

请注意，Hibernate正在向控制台日志打印SQL查询，这是从org.hibernate.engine.jdbc.spi.SqlStatementLogger类logStatement方法发生的，代码片段是：

if (this.logToStdout)
	System.out.println("Hibernate: " + statement);

这由hibernate.show_sqlhibernate.cfg.xml文件中的属性控制。实际上，如果您使用的是log4j，那么您应该将其关闭，因为如果日志级别设置为DEBUG模式，它们也将成为日志文件的一部分。将它放在日志文件中更有意义，将它打印在控制台上。

这就是hibernate log4j日志示例的全部内容，因为您可以看到它非常容易插件，我们所需要的只是正确配置log4j。您可以从下面的链接下载该项目。

下载Hibernate Log4j项目

 

转载来源：https://www.journaldev.com/2984/hibernate-log4j-logging