Maven的学习资料收集--（六）构建Hibernate项目

前面我们使用Maven构建了Struts2项目，这里我们来试一下Hibernate项目：

这里的例子，大体框架应该是正确的，但是，对于Maven的很多约定都没有掌握，估计包的命名都不是非常好，等以后，理解深刻了再改吧

1. 构建一个基本的Web项目

这里请参考前面的博客，一样的

2. 添加依赖，修改pom.xml

<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.deppon.demo</groupId>
<artifactId>test03</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>test03 Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>3.6.5.Final</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.6.4</version>
</dependency>
<dependency>
<groupId>javassist</groupId>
<artifactId>javassist</artifactId>
<version>3.11.0.GA</version>
</dependency>
</dependencies>
<build>
<finalName>test03</finalName>
</build>
</project>

在保存的时候，Maven会自动从库中各种包下载到本地，如果有异常的话，可以尝试手动下载

3. 添加hibernate.cfg.xml和log4j.properties资源文件

注意，资源文件的话，根据约定，需要放在src/main/resources文件夹下

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name="connection.url">jdbc:sqlserver://localhost:1433;DatabaseName=Demo</property>
<property name="connection.username">ygy</property>
<property name="connection.password">shishi</property>
<property name="javax.persistence.validation.mode">none</property>
<property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class="com.deppon.test03.entity.PersonEntity"/>
</session-factory>
</hibernate-configuration>

log4j.properties

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.rootLogger=debug, stdout
log4j.logger.org.hibernate.tool.hbm2ddl=debug

4. 新建一个实体类，测试一下

PersonEntity.java

package com.deppon.test03.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "t_person")
public class PersonEntity implements java.io.Serializable {
private static final long serialVersionUID = -4376187124011546736L;
private Integer id;
private String name;
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length = 50 , nullable = false , unique = true)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "PersonEntity [id=" + id + ", name=" + name + "]";
}
}

HibernateUtil.java

package com.deppon.test03.util;
import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
/** ThreadLocal Session Map */
public static final ThreadLocal<Session> SESSIONMAP = new ThreadLocal<Session>();
private static final SessionFactory sessionFactory;
private static final Logger LOGGER = Logger.getLogger(HibernateUtil.class);
static {
try {
LOGGER.debug("HibernateUti.static - loading cofig");
sessionFactory = new Configuration().configure("hibernate.cfg.xml")
.buildSessionFactory();
LOGGER.debug("HibernateUtil.static - end");
} catch (Throwable ex) {
ex.printStackTrace();
LOGGER.error("HibernateUti error : ExceptionInInitializerError");
throw new ExceptionInInitializerError(ex);
}
}
private HibernateUtil() {
}
public static Session getSession() throws HibernateException {
Session session = SESSIONMAP.get();
if(session == null) {
session = sessionFactory.openSession();
SESSIONMAP.set(session);
}
return session;
}
public static void closeSession() throws HibernateException {
Session session = SESSIONMAP.get();
SESSIONMAP.set(null);
if(session != null) {
session.close();
}
}
}

测试类 ModelTest.java

package com.deppon.test03.model;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Assert;
import org.junit.Test;
import com.deppon.test03.entity.PersonEntity;
import com.deppon.test03.util.HibernateUtil;
public class ModelTest {
@Test
public void testGetSession() {
Session session = HibernateUtil.getSession();
Assert.assertNotNull(session);
HibernateUtil.closeSession();
}
@Test
public void testExport() {
new SchemaExport(new Configuration().configure()).create(true , true);
}
@Test
public void testSave() {
PersonEntity person = new PersonEntity();
person.setId(100);
person.setName("路飞");
Session session = HibernateUtil.getSession();
Transaction tx = session.beginTransaction();
session.save(person);
tx.commit();
HibernateUtil.closeSession();
}
@Test
public void testQuery() {
Session session = HibernateUtil.getSession();
session.beginTransaction();
@SuppressWarnings("unchecked")
List<PersonEntity> personList = session.createQuery("select p from PersonEntity p").list();
for(PersonEntity eachPerson : personList) {
System.out.println(eachPerson);
}
session.getTransaction().commit();
HibernateUtil.closeSession();
}
}

项目结构如下图所示：

对了，注意一下，在上面的pom.xml中，没有看到数据库驱动包，我用的是SQL Server，直接将jar包放到了项目的lib文件夹下，而从网上查的说，使用scope引入本地的包，试了一下，好像不行，等我再试一试。

5. 测试

如果你现在运行JUnit测试的话，是不会成功的，昨天晚上就是这个原因，提示说找不到hibernate.cfg.xml，

后来发现，在target文件夹下，并没有生成class文件，配置文件也没有，这样当然运行不成功

这里需要执行两个命令

使用CMD窗口，进入当前项目的根目录：

第一条命令：输入mvn compile

注意：这里一定要成功啊，即 BUILD SUCCESS

第二条命令：输入mvn test-compile

同样的，这里一定要 BUILD SUCCESS

这样的话，再一次运行测试程序，就可以成功了！