Hibernate读取Blob图片

最新推荐文章于 2018-06-09 14:48:00 发布

转载最新推荐文章于 2018-06-09 14:48:00 发布 · 1.9k 阅读

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本文演示了如何使用Hibernate框架将图片文件作为Blob对象存储到数据库中，并从数据库中检索出来重新保存为图片文件的过程。该过程涉及Blob对象的创建、会话(Session)和事务(Transaction)的管理。

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package hibernate;

import java.sql.Blob;

public class Blobtest  implements java.io.Serializable {

     private long id;
     private Blob image;

    public Blobtest() {
    }

    public Blobtest(Blob image) {
        this.image = image;
    }

    public long getId() {
        return this.id;
    }
    
    public void setId(long id) {
        this.id = id;
    }

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

package hibernate;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class Test {
    public static void main(String[] args) throws IOException {
        InputStream in = new FileInputStream("C:/test.jpg");        
        byte[] b = new byte[in.available()];
        in.read(b);
        in.close();
        Blobtest blobTest=new Blobtest();

        blobTest.setImage(Hibernate.createBlob(b));
        Session session=HibernateUtil.currentSession();
        Transaction tx=session.beginTransaction(); 
        session.save(blobTest); 
        tx.commit(); 
        System.out.print("success"); 
        HibernateUtil.closeSession();
    }
}

package hibernate;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.SQLException;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class TestWrite {
    public static void main(String[] args) throws IOException, SQLException {
        Session session=HibernateUtil.currentSession();
        Transaction tx=session.beginTransaction();
        Blobtest blobTest = new Blobtest();
        blobTest = (Blobtest) session.get(Blobtest.class, new Long(1));
        System.out.println("qu chu shu ju");
        OutputStream out = new FileOutputStream("C:/test.jpg");
        out.write(blobTest.getImage().getBytes(1,(int) blobTest.getImage().length()));
        out.flush();
        out.close();
        HibernateUtil.closeSession();
    }
}

参考地址：http://www.blogjava.net/dihin/archive/2006/06/25/54956.html