Oracle中插入圖片并顯示(用BLOB類型)
要在oracle里面存入圖片 用 blob類型
首先在數(shù)據(jù)庫里建立：
--連接到管理員
conn sys/tbsoft as sysdba;
--為scott用戶授權(quán)
grant create any directory to scott;
--回到scott用戶
conn scott/tiger;
--創(chuàng)建存儲圖片的表
CREATE TABLE IMAGE_LOB (T_ID VARCHAR2 (5) NOT NULL,T_IMAGE BLOB NOT NULL);
--創(chuàng)建存儲圖片的目錄
CREATE OR REPLACE DIRECTORY IMAGES AS 'C:\picture';
--在c：下自己建一個叫picture的文件夾
CREATE OR REPLACE PROCEDURE IMG_INSERT (TID VARCHAR2,FILENAME VARCHAR2) AS
F_LOB BFILE;--文件類型
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);
--獲取指定目錄下的文件
DBMS_LOB.FILEOPEN(F_LOB, DBMS_LOB.FILE_READONLY);
--以只讀的方式打開文件
DBMS_LOB.LOADFROMFILE (B_LOB, F_LOB,DBMS_LOB.GETLENGTH (F_LOB));
--傳遞對象
DBMS_LOB.FILECLOSE (F_LOB);
--關(guān)閉原始文件
COMMIT;
END;
/
--在C:\picture下放一張圖片1.gif
--將該圖片存入表
call IMG_INSERT('1','1.gif');
然后創(chuàng)建一個web項目 連接數(shù)據(jù)庫后 創(chuàng)建一個BlobDAO類 用來取出表中的blob類型圖片
Java代碼 收藏代碼
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的長度
bt = new byte[bufferSize];
try {
ins.read(bt, 0, bufferSize);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//建立字節(jié)緩存
} 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里面調(diào)用getImage()方法并顯示圖片在頁面上
Java代碼 收藏代碼
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;
}
添加圖片到數(shù)據(jù)庫
請在c盤下放入圖片--c:\\4.gif
Java代碼 收藏代碼
public void savaImg(String imgId) {
//傳的是存入數(shù)據(jù)庫圖片的id
initConn();
Statement st = null;
BLOB blob = null; //圖片類型
OutputStream outputStream = null; //輸出流
File file = null; //文件
InputStream inputStream = null; //輸入流
ResultSet rs = null;
try {
conn.setAutoCommit(false); //事物由程序員操作
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();
}
}
}
操作完畢！
作者“669098238”
