一、建立表 
oracle： 

create table baoxiandan ( 
  id number(20) not null, 
  fileName varchar2(200) not null, 
  content blob, 
  primary key(id) 
  ); 
create sequence seq_baoxiandan; 

二、Hibernate對映檔案 

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 
<hibernate-mapping> 
    <class name="com.erry.tntops.acer.model.impl.CarrierImpl" 
           table="BAOXIANDAN" 
           proxy="com.erry.tntops.acer.model.Carrier"> 
        <id name="id" column="ID" type="long" unsaved-value="-1"> 
            <generator class="sequence"> 
                <param name="sequence">SEQ_BAOXIANDAN</param> 
            </generator> 
        </id> 
        <property name="fileName" column="filename" type="java.lang.String" not-null="false"> 
            <meta attribute="caption">${tntops.acer.Carrier.code}</meta> 
        </property> 
        <property name="content" column="content" type="byte[]"> 
            <meta attribute="caption">${tntops.acer.Carrier.name}</meta> 
        </property> 
    </class> 
</hibernate-mapping> 

三、pojo類 


import com.erry.tntops.common.model.impl.BaseModelImpl; 
import com.erry.tntops.acer.model.Carrier; 

import java.util.Date; 

/** 
* Created by IntelliJ IDEA. 
* User: chenyang 
* Date: 2008-7-28 
* Time: 17:46:32 
* To change this template use File | Settings | File Templates. 
*/ 
public class CarrierImpl extends BaseModelImpl implements Carrier { 

    private long id; 
    private String fileName; 
    private byte content[]; 

    public long getId() { 
        return id; 
    } 

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

    public String getFileName() { 
        return fileName; 
    } 

    public void setFileName(String fileName) { 
        this.fileName = fileName; 
    } 

    public byte[] getContent() { 
        return content; 
    } 

    public void setContent(byte[] content) { 
        this.content = content; 
    } 
} 

四、Java程式碼 
1、入庫 
            //獲得檔名，fileNamePath為檔案路徑變數 
            String fileName = fileNamePath.substring(fileNamePath.lastIndexOf("\\") + 1); 
            File file = new File(fileNamePath); 
            InputStream inputStream = new FileInputStream(file); 
            byte[] data = new byte[] {}; 
            data = inputStreamToByte(inputStream);//將檔案儲存到位元組陣列中 
            Carrier carrier = (Carrier) SpringContext.getBeanOfType(Carrier.class); 
            carrier.setFileName(fileName); 
            carrier.setContent(data); 
            dao.create(carrier); 

//將檔案儲存到位元組陣列中 
    private byte [] inputStreamToByte(InputStream is) throws IOException { 
        ByteArrayOutputStream bAOutputStream = new ByteArrayOutputStream(); 
        int ch; 
        while((ch = is.read() ) != -1){ 
            bAOutputStream.write(ch); 
        } 
        byte data [] =bAOutputStream.toByteArray(); 
        bAOutputStream.close(); 
        return data; 
    } 

2、出庫 
byte data [] = new byte[]{}; 
        File file =null ; 
        FileOutputStream fos = null; 
        InputStream in = null; 

        String hql = "select carrier from com.erry.tntops.acer.model.Carrier carrier where carrier.fileName=:fileName"; 
        Map map = new HashMap(); 
        map.put("fileName", fileName); 
        Collection collection =  dao.retrieve(hql, map); 
        if(collection != null && collection.size() > 0){ 
            Iterator it = collection.iterator(); 
            Carrier carrier = (Carrier) it.next(); 
            data = carrier.getContent(); 

        } 
//匯出成檔案 
        file = new File("d:\\" + fileName); 
        if (!file.exists()) { 
            file.createNewFile(); // 如果檔案不存在，則建立 
        } 
        fos = new FileOutputStream(file); 
        int size = 0; 
        if (data.length > 0) { 
            fos.write(data, 0, data.length); 
        } else { 
            while ((size = in.read(data)) != -1) { 
                fos.write(data, 0, size); 
            } 
            in.close(); 
        } 
        fos.close();