java上传文件-大文件以二进制保存到数据库

转自：https://blog.csdn.net/qq_29631069/article/details/70054201
 1 一、创建表
 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映射文件

 <?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类

 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代码
 1、入库
             //获得文件名，fileNamePath为文件路径变量
             String fileName = fileNamePath.substring(fileNamePath.lastIndexOf("\\") + 1);
             File file = new File(fileNamePath);
             InputStream inputStream = new FileInputStream(file);
             byte[] data = new byte[] {};
             data = inputStreamToByte(inputStream);//将文件保存到字节数组中
             Carrier carrier = (Carrier) SpringContext.getBeanOfType(Carrier.class);
             carrier.setFileName(fileName);
             carrier.setContent(data);
             dao.create(carrier);

 //将文件保存到字节数组中
     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、出库
 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();

         }
 //导出成文件
         file = new File("d:\\" + fileName);
         if (!file.exists()) {
             file.createNewFile(); // 如果文件不存在，则创建
         }
         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();