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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&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
