一 对象类型
二 将图片写入数据库
1、Students
import java.sql.Blob;
import java.util.Date;
//学生类
public class Students {
/*
* JavaBeans的四点原则
* 1.必须是公有的类
* 2.提供公有的不带参数的默认的构造方法
* 3.属性私有
* 4.属性setter/getter封装
*/
private int sid; // 学号
private String sname; // 姓名
private String gender; // 性别
private Date birthday; // 出生日期
private String address; // 地址
private Blob picture;//照片
public Blob getPicture() {
return picture;
}
public void setPicture(Blob picture) {
this.picture = picture;
}
public Students() {
}
public Students(int sid, String sname, String gender, Date birthday,
String address) {
// super();
this.sid = sid;
this.sname = sname;
this.gender = gender;
this.birthday = birthday;
this.address = address;
}
public int getSid() {
return sid;
}
public void setSid(int 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;
}
@Override
public String toString() {
return "Students [sid=" + sid + ", sname=" + sname + ", gender="
+ gender + ", birthday=" + birthday + ", address=" + address
+ "]";
}
}
2、hibernate.cfg.xml配置
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
<!-- Generated 2017-9-17 10:33:28 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="Students" table="STUDENTS">
<id name="sid" type="int">
<column name="SID" />
<generator class="native" />
<!-- <generator class="assigned" />-->
</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="timestamp">
<column name="BIRTHDAY" />
</property>
<property name="address" type="java.lang.String">
<column name="ADDRESS" />
</property>
<property name="picture" type="java.sql.Blob">
<column name="PICTURE" />
</property>
</class>
</hibernate-mapping>
3、测试方法
@Test
public void testWriteBlog() throws Exception{
Students s= new Students(1,"张三丰","男",new Date(),"武当山");
//先获得照片文件
File f = new File("E:"+File.separator+"1.png");
//获得照片文件的输入流
InputStream input = new FileInputStream(f);
//创建一个Blob对象
Blob image = Hibernate.getLobCreator(session).createBlob(input, input.available());
//设置照片属性
s.setPicture(image);
session.save(s);
}
4、测试结果
三 将图片从数据库读出
1、测试方法
@Test
public void testReadBlog() throws Exception{
Students s= (Students)session.get(Students.class, 1);
//获得Blob对象
Blob image = s.getPicture();
//获得照片的输入流
InputStream input = image.getBinaryStream();
//创建文件
File f = new File("E:"+File.separator+"2.png");
//获得输出流
OutputStream output = new FileOutputStream(f);
//创建缓冲区
byte[] buff = new byte[input.available()];
input.read(buff);
output.write(buff);
input.close();
output.close();
}
2、测试结果
