要在oracle里面存入图片 用 blob类型

首先在数据库里建立：

--连接到管理员

conn sys/tbsoft as sysdba;

--为scott用户授权

grant create any directory to

scott;

--回到scott用户

conn scott/tiger;

--创建存储图片的表

CREATE TABLE IMAGE_LOB (T_ID VARCHAR2

(5) NOT NULL,T_IMAGE BLOB NOT NULL);

--创建存储图片的目录

CREATE OR REPLACE DIRECTORY IMAGES AS

'C:\picture';

--在c：下自己建一个叫picture的文件夹

CREATE OR REPLACE PROCEDURE IMG_INSERT

(TID VARCHAR2,FILENAME VARCHAR2) AS

F_LOB BFILE;--文件类型

B_LOB BLOB;

BEGIN

iNSERT INTO IMAGE_LOB (T_ID,

T_IMAGE)

VALUES (TID,EMPTY_BLOB ()) RETURN

T_IMAGE INTO B_LOB;

--插入空的blob

F_LOB:= BFILENAME ('IMAGES',

FILENAME);

--获取指定目录下的文件

DBMS_LOB.FILEOPEN(F_LOB,

DBMS_LOB.FILE_READONLY);

--以只读的方式打开文件

DBMS_LOB.LOADFROMFILE (B_LOB,

F_LOB,DBMS_LOB.GETLENGTH (F_LOB));

--传递对象

DBMS_LOB.FILECLOSE (F_LOB);

--关闭原始文件

COMMIT;

END;

/

--在C:\picture下放一张图片1.gif

--将该图片存入表

call IMG_INSERT('1','1.gif');

然后创建一个web项目 连接数据库后 创建一个BlobDAO类

用来取出表中的blob类型图片

public class BlobDAO {

private static final BlobDAO instance = new BlobDAO();

private Connection conn = null;

private BlobDAO() {

}

public static BlobDAO getInstance() {

return instance;

}

private void initConn() {

conn =

DBAccess.getInstance().getConn();

}

public byte[] getImage(String imgname) {

BufferedInputStream

ins;//取得BLOB的IO流

byte[] bt = null;

initConn();

Blob bo = null;

PreparedStatement ps =

null;

ResultSet rs = null;

String sql = "select T_IMAGE

from IMAGE_LOB where t_id=?";

try {

ps =

conn.prepareStatement(sql);

ps.setString(1, imgname);

rs = ps.executeQuery();

if (rs.next()) {

bo = rs.getBlob("T_IMAGE");

try {

ins = new

BufferedInputStream(bo.getBinaryStream());

int

bufferSize = (int) bo.length();//取得BLOB的长度

bt = new

byte[bufferSize];

try {

ins.read(bt, 0, bufferSize);

} catch

(IOException e) {

// TODO

Auto-generated catch block

e.printStackTrace();

}

//建立字节缓存

} catch (SQLException e) {

// TODO

Auto-generated catch block

e.printStackTrace();

}

}

} catch (SQLException e)

{

// TODO Auto-generated catch

block

e.printStackTrace();

} finally {

try {

rs.close();

ps.close();

conn.close();

} catch (SQLException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return bt;

}

}

在action里面调用getImage()方法并显示图片在页面上

public ActionForward

execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request,

HttpServletResponse response) {

// TODO Auto-generated method

stub

BlobDAO blobDAO =

BlobDAO.getInstance();

byte[] bs =

blobDAO.getImage("1");

try {

response.getOutputStream().write(bs);

} catch (IOException e) {

// TODO Auto-generated catch

block

e.printStackTrace();

}

return null;

}

添加图片到数据库

请在c盘下放入图片--c:\\4.gif

public void savaImg(String imgId)

{

//传的是存入数据库图片的id

initConn();

Statement st = null;

BLOB blob = null; //图片类型

OutputStream outputStream = null; //输出流

File file = null; //文件

InputStream inputStream = null; //输入流

ResultSet rs = null;

try {

conn.setAutoCommit(false); //事物由程序员操作

st = conn.createStatement();

st.executeQuery("insert into IMAGE_LOB values('"+

imgId +"',empty_blob())");

rs = st.executeQuery("select T_IMAGE from

IMAGE_LOB where t_id='"+ imgId +"' for update");

if (rs.next()) {

blob = (BLOB) rs.getBlob(1);

outputStream = blob.getBinaryOutputStream();

file = new File("c:\\4.gif");

inputStream = new FileInputStream(file);

byte[] b = new byte[blob.getBufferSize()];

int len = 0;

while ((len = inputStream.read(b)) != -1) {

System.out.println(len);

outputStream.write(b, 0, len);

}

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

try {

inputStream.close();

outputStream.flush();

outputStream.close();

rs.close();

st.close();

conn.commit();

conn.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

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