Hibernate4对文件的操作

Druid数据库驱动: Hibernate操作数据库文件不会报错，jdts容易报错。

注解：
在hibernate Annotation中，实体BLOB、CLOB类型的注解与普通的实体属性有些不同，具体操作如下：BLOB类型，类型声明为byte[]：

private byte[] content；
@Lob 
@Basic(fetch = FetchType.LAZY) 
@Column(name = "CONTENT", columnDefinition = "BLOB",nullable=true) 
public byte[] getContent() { 
   return this.content; 
} 

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

CLOB类型，类型声明为String即可：

private String remark；
@Lob 
@Basic(fetch = FetchType.EAGER) 
@Column(name="REMARK", columnDefinition="CLOB", nullable=true) 
public String getRemark() { 
   return this.remark; 
} 

public void setRemark(String recvdocRemark) { 
   this.remark = remark; 
}

    按照以上的设置实体类的注解就搞定了。

LobHelper.createBlob()
Hibernate.getLobCreator(getCurrentSession()).createBlob(stream, length)

package com.pandy.ssh4.domian;

// Generated 2013-3-13 16:41:18 by Hibernate Tools 4.0.0

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * Table4 generated by hbm2java
 */
@SuppressWarnings("serial")
@Entity
@Table(name = "TABLE4", schema = "dbo", catalog = "Test")
public class Table4 implements java.io.Serializable {

	private int t4Id;
	private String filename1;
	private String content;
	private String filename2;
	private byte[] fileContent;

	......

}

package com.pandy.ssh4.domian;

// Generated 2013-3-13 16:41:18 by Hibernate Tools 4.0.0

import java.sql.Blob;
import java.sql.Clob;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * Table4 generated by hbm2java
 */
@SuppressWarnings("serial")
@Entity
@Table(name = "TABLE4", schema = "dbo", catalog = "Test")
public class Table41 implements java.io.Serializable {

	private int t4Id;
	private String filename1;
	private Clob content;
	private String filename2;
	private Blob fileContent;

	......

}

两种方式,保存到数据库:

package com.pandy.ssh4.dao.impl;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.Clob;
import java.util.List;

import org.hibernate.Hibernate;
import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.stereotype.Repository;

import com.pandy.ssh4.dao.BasicDao;
import com.pandy.ssh4.domian.Table4;
import com.pandy.ssh4.domian.Table41;

@Repository
public class Table4Dao extends BasicDao {

	public StringBuffer readerTxtFile() {
		StringBuffer sb;
		BufferedReader bf;
		try {
			sb = new StringBuffer();
			bf = new BufferedReader(new FileReader(new File("d:\\a.txt")));

			String str = null;
			while ((str = bf.readLine()) != null) {
				sb.append(str);
				sb.append("\n");
			}
			bf.close();
			return sb;
		} catch (Exception e) {
			throw new RuntimeException(e.getMessage());
		} finally {

		}

	}
	
	public byte[] getFileBtyes() {
		InputStream in;
		try {
			in = new FileInputStream(new File("d:\\a.jpg"));
			byte[] bytes = new byte[in.available()];

			in.read(bytes);
			in.close();

			return bytes;
		} catch (Exception e) {
			throw new RuntimeException(e.getMessage());
		}

	}

	// 第一种方式
	public void insertFile1() {
		try {
			InputStream in = new FileInputStream(new File("d:\\a.jpg"));
			StringBuffer sb = readerTxtFile();
			Session session = getCurrentSession();

			Clob clob = Hibernate.getLobCreator(session).createClob(sb.toString());

			Blob blob = Hibernate.getLobCreator(session).createBlob(in,in.available());

			Table41 table41 = new Table41();
			table41.setFilename1("a.txt");
			table41.setContent(clob);
			table41.setFilename2("a.jpg");
			table41.setFileContent(blob);

			session.save(table41);

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	// 第二种方式
	public void insertFile2() {
		try {
			Session session = getCurrentSession();
			StringBuffer sb = readerTxtFile();
			byte[] bytes = getFileBtyes();

			Table4 table4 = new Table4();
			table4.setFilename1("a.txt");
			table4.setContent(sb.toString());
			table4.setFilename2("a.jpg");
			table4.setFileContent(bytes);
			
			session.save(table4);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	// 读取操作1
	@SuppressWarnings("rawtypes")
	public Table4 getTable4() {

		Session session = getCurrentSession();
		String hql = "from Table4";
		Query query = session.createQuery(hql);
		List list = query.list();
		if (list != null && !list.isEmpty()) {
			return (Table4) list.get(0);
		} else
			return null;

	}

	// 读取操作2
	@SuppressWarnings("rawtypes")
	public Table41 getTable41() {

		Session session = getCurrentSession();
		String hql = "from Table41";
		Query query = session.createQuery(hql);
		List list = query.list();
		if (list != null && !list.isEmpty()) {
			return (Table41) list.get(0);
		} else
			return null;

	}

}