学步园

在网上搜了很多文章，发现要配置很多东东，而且，配置了也要报错，笔者发现一个无需特殊配置的方法，操作很简单，废话不多说，看代码：

package com.czp.test;

public class BlobTest {

	 private int id;
	 private Object obj;//这里可以是任何对象
	 private byte[] bytes;
	 
	 
	public byte[] getBytes() {
		return bytes;
	}
	public void setBytes(byte[] bytes) {
		this.bytes = bytes;
	}
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public Object getObj() {
		return obj;
	}
	public void setObj(Object obj) {
		this.obj = obj;
	}
	 
}





package com.czp.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.sql.Blob;
import java.util.ArrayList;
import java.util.List;

import org.hibernate.Hibernate;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class BlobDao extends HibernateDaoSupport{
      
	/**
	 * 保存对象
	 * @param blobTest
	 * @throws Exception
	 */
	public void add(BlobTest blobTest) throws Exception
	{
		File file = File.createTempFile(blobTest.hashCode() + "", null);
		if (file != null) {
			ObjectOutputStream ob = new ObjectOutputStream(new FileOutputStream(file));
			ob.writeObject(blobTest.getObj());
			ob.flush();
			ob.close();
			ob = null;
			FileInputStream fis = new FileInputStream(file);
			byte[] b = new byte[fis.available()];
			fis.read(b);
			fis.close();
			blobTest.setBytes(b);
			this.getHibernateTemplate().save(blobTest);
	}
		
	}
	/**
	 * 获取对象
	 * @return
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public List<BlobTest> getBlob() throws Exception
	{
		List<BlobTest> listtmp = new ArrayList<BlobTest>();
		List<BlobTest> list = this.getHibernateTemplate().loadAll(BlobTest.class);
		for (BlobTest blt : list) {
			Blob b = Hibernate.createBlob(blt.getBytes());
			ObjectInputStream ois = new ObjectInputStream(b.getBinaryStream());
			Object obj = ois.readObject();
			ois.close();
			ois = null;
			blt.setObj(obj);
			listtmp.add(blt);
			
		}
		return listtmp ;
		
	}
}

hibernate spring的配置省略，只需要将BlobTest的bytes属性在hibernate映射文件里映射为:<property name="bytes" type="binary" not-null="true" column="`XXXX`"></property>即可