java保存blob字段到数据库

持久类定义字段： private Blob diff;

设置要保存的对象:

public Blob getBlob(Object o) {

ByteArrayOutputStream outs = new ByteArrayOutputStream();

try {

ObjectOutputStream oos = new ObjectOutputStream(outs);

oos.writeObject(o);

} catch (IOException e) {

throw new RuntimeException(e);

}

return (Hibernate.createBlob(outs.toByteArray()));

}

从数据库中取出要对象：

diff=rs.getBlob("content")

将blob字段转换成对象:

// 从申请单中取出对象

public Object getObject() {

Object obj = null;

try {

ObjectInputStream ois = new ObjectInputStream(diff.getBinaryStream());

obj = (Object) ois.readObject();

} catch (SQLException e) {

e.printStackTrace();

} catch (IOException e) {

throw new RuntimeException(e);

} catch (ClassNotFoundException e) {

e.printStackTrace();

}

return obj;