Hibernate学习四----------Blob

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 实例

1.项目结构

2.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>org.hibernate</groupId>
	<artifactId>Hibernate-Image</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Hibernate-Image Maven Webapp</name>
	<url>http://maven.apache.org</url>
	
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<hibernate.version>5.1.6.Final</hibernate.version>
	</properties>
	
	<dependencies>
		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- hibernate -->
		<dependency>
		    <groupId>org.hibernate</groupId>
		    <artifactId>hibernate-core</artifactId>
		    <version>${hibernate.version}</version>
		</dependency>
		<!-- MySQL -->
		<dependency>
		    <groupId>mysql</groupId>
		    <artifactId>mysql-connector-java</artifactId>
		    <version>5.1.42</version>
		</dependency>
	</dependencies>
  <build>
    <finalName>Hibernate-Image</finalName>
  </build>
</project>

3.Student.java

package org.hibernate.model;

import java.sql.Blob;
import java.util.Date;

public class Student {

	private long sid;// 学号
	private String sname;// 姓名
	private String gender;// 性别
	private Date birthday;// 生日
	private String address;// 性别
	private Blob image;// 头像

	public Student() {
	}

	public Student(String sname, String gender, Date birthday, String address, Blob image) {
		this.sname = sname;
		this.gender = gender;
		this.birthday = birthday;
		this.address = address;
		this.image = image;
	}

	public long getSid() {
		return sid;
	}

	public void setSid(long sid) {
		this.sid = sid;
	}

	public String getSname() {
		return sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

	public String getGender() {
		return gender;
	}

	public void setGender(String gender) {
		this.gender = gender;
	}

	public Date getBirthday() {
		return birthday;
	}

	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public Blob getImage() {
		return image;
	}

	public void setImage(Blob image) {
		this.image = image;
	}

}

4.Student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>

	<class name="org.hibernate.model.Student" table="STUDENT">
		<id name="sid" type="java.lang.Long">
			<column name="SID"/>
			<generator class="native"/>
		</id>
		<property name="sname" type="java.lang.String">
			<column name="SNAME"/>
		</property>
		<property name="gender" type="java.lang.String">
			<column name="GENDER"/>
		</property>
		<property name="birthday" type="date">
			<column name="BIRTHDAY"/>
		</property>
		<property name="address" type="java.lang.String">
			<column name="ADDRESS"/>
		</property>
		<property name="image" type="java.sql.Blob">
			<column name="IMAGE"/>
		</property>
	</class>

</hibernate-mapping>

5.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>

	<!-- SessionFactory配置 -->
	<session-factory>
		<!-- 数据库连接配置 -->
		<property name="connection.username">root</property>
		<property name="connection.password">***</property>
		<property name="connection.drvier_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">
			jdbc:mysql:///hibernate?useSSL=true&amp;characterEncoding=UTF-8
		</property>
		
		<!-- 基本配置 -->
		<property name="hbm2ddl.auto">update</property>
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		<property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
		
		<!-- 引用映射文件 -->
		<mapping resource="hbm/Student.hbm.xml"/>
	</session-factory>

</hibernate-configuration>

6.ImageTest.java

package org.hibernate.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.util.Date;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.model.Student;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class ImageTest {

	private SessionFactory sessionFactory;
	private Session session;
	private Transaction transaction;
	
	@Before
	public void before() {
		
		Configuration config = new Configuration().configure();// 创建配置对象
		sessionFactory = config.buildSessionFactory();// 创建SessionFactory对象
		session = sessionFactory.openSession();// 创建session对象
		transaction = session.beginTransaction(); // 开启事务
		
	}
	
	@After
	public void after() {
		
		transaction.commit();// 提交事务
		session.close();// 关闭session
		sessionFactory.close();// 关闭SessionFactory
		
	}
	
	@Test
	public void saveStudentWithImage() throws Exception {
		
		// 获取图片文件
		File file = new File("C:/Users/chen/Pictures/demo.jpg");
		// 获取图片文件的输入流
		InputStream is = new FileInputStream(file);
		// 创建一个Blob对象
		Blob image = Hibernate.getLobCreator(session).createBlob(is, is.available());
		// 创建Student对象
		Student s = new Student("张三", "男", new Date(), "北京市", image);
		// 保存对象
		session.save(s);
		
	}
	
	@Test
	public void readImage() throws Exception {
		
		Student s = session.get(Student.class, 1L);
		// 获取图片的Blob对象
		Blob image = s.getImage();
		// 获取照片的输入流
		InputStream is = image.getBinaryStream();
		// 创建输出文件
		File file = new File("C:/Users/chen/Pictures/test.jpg");
		// 获取输出流
		OutputStream os = new FileOutputStream(file);
		// 创建缓存区
		byte[] buff = new byte[is.available()];
		// 将输入流读入到缓存中
		is.read(buff);
		// 将缓存区数据写到输出流中
		os.write(buff);
		// 关闭输入流
		is.close();
		// 关闭输出流
		os.close();
		
	}
	
}

7.效果预览

　　7.1 执行saveStudentWithImage()方法

　　7.2 执行readImage()方法

参考：http://www.imooc.com/video/7740