java操作保存图片到oracle数据库及…

谁借莪１个温暖的怀抱￠ 2022-08-10 15:00 364阅读 0赞

《--------保存图片到数据库--------------》  
public void savePic(InputStream is)\{  
String insertsql = "insert into pic(id,pic) values(1,empty\_blob())";  
Connection conn = null;  
Statement stmt = null;  
PreparedStatement ps = null;  
ResultSet rs = null;  
try \{  
conn = ds.getConnection();  
conn.setAutoCommit(false);  
stmt = conn.createStatement();  
int rt = stmt.executeUpdate(insertsql);  
if(rt > 0)\{  
System.out.println("initialization succeed!!");  
String preCursor = "select id,pic from pic where id='1' for update";  
rs = stmt.executeQuery(preCursor);  
rs.next();  
Blob b = (Blob)rs.getBlob("pic");  
BufferedOutputStream bos = new BufferedOutputStream(b.setBinaryStream(0L));  
BufferedInputStream bis = new BufferedInputStream(is);  
int bytes;  
try \{  
while((bytes = bis.read()) != -1)\{  
bos.write(bytes);  
\}  
  
bis.close();  
bos.close();  
conn.commit();  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
\}  
  
\} catch (SQLException e) \{  
e.printStackTrace();  
\} finally\{  
try \{  
rs.close();  
stmt.close();  
conn.close();  
\} catch (SQLException e) \{  
e.printStackTrace();  
\}  
\}  
\}  
  
  
《--------获取图片到到页面--------------》  
public JPEGImageEncoder getPic(String id,HttpServletResponse res) throws IOException\{  
Connection conn = null;  
Statement stmt = null;  
PreparedStatement ps = null;  
ResultSet rs = null;  
BufferedInputStream imageStream = null;  
BufferedImage image = null;  
JPEGImageEncoder encoder = null;  
ServletOutputStream sos = res.getOutputStream();  
try \{  
conn = ds.getConnection();  
conn.setAutoCommit(false);  
stmt = conn.createStatement();  
System.out.println("initialization succeed!!");  
String preCursor = "select id,pic from pic where id='1'";  
rs = stmt.executeQuery(preCursor);  
rs.next();  
imageStream = new BufferedInputStream(((Blob)rs.getBlob(2)).getBinaryStream());  
try \{  
image = ImageIO.read(imageStream);  
encoder = JPEGCodec.createJPEGEncoder(sos);  
encoder.encode(image);  
imageStream.close();  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
  
\} catch (SQLException e) \{  
e.printStackTrace();  
\} finally\{  
try \{  
rs.close();  
stmt.close();  
conn.close();  
\} catch (SQLException e) \{  
e.printStackTrace();  
\}  
\}  
return encoder;  
\}

从数据库获取图片，导出到本地的完整代码：

package dbcon;  
  
import java.awt.image.BufferedImage;  
import java.io.BufferedInputStream;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import java.sql.Blob;  
import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.PreparedStatement;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.sql.Statement;  
  
import javax.imageio.ImageIO;  
import javax.servlet.ServletOutputStream;  
import javax.servlet.http.HttpServletResponse;  
  
import com.sun.image.codec.jpeg.JPEGCodec;  
import com.sun.image.codec.jpeg.JPEGImageEncoder;  
  
public class DBManager \{  
private String url = "jdbc:oracle:thin:@10.23.65.21:1521:orcl";  
private String userName = "test";  
private String password = "test";  
private String driver = "oracle.jdbc.driver.OracleDriver";  
private Connection conn;  
  
  
public DBManager()\{  
try \{  
Class.forName(driver);  
conn = DriverManager.getConnection(url, userName, password);  
\} catch (ClassNotFoundException e) \{  
e.printStackTrace();  
\} catch (SQLException e) \{  
e.printStackTrace();  
\}  
\}  
  
public void getPic(String picPath) throws IOException\{  
Statement stmt = null;  
PreparedStatement ps = null;  
ResultSet rs = null;  
BufferedInputStream imageStream = null;  
BufferedImage image = null;  
JPEGImageEncoder encoder = null;  
try \{  
conn.setAutoCommit(false);  
stmt = conn.createStatement();  
System.out.println("initialization succeed!!");  
String preCursor = "select id,zp from zpb where id='2220087'";  
rs = stmt.executeQuery(preCursor);  
while(rs.next())\{  
imageStream = new BufferedInputStream(((Blob)rs.getBlob(2)).getBinaryStream());  
try \{  
String id = rs.getString(1);  
File picturePath = new File(picPath +"/"+ id +".jpg");  
boolean created = false;  
if(!picturePath.exists())\{  
created = picturePath.createNewFile();  
\} else \{  
created = true;  
\}  
if(created)\{  
// ServletOutputStream sos = res.getOutputStream();  
OutputStream ostream = new FileOutputStream(picturePath);  
image = ImageIO.read(imageStream);  
encoder = JPEGCodec.createJPEGEncoder(ostream);  
encoder.encode(image);  
imageStream.close();  
ostream.flush();  
ostream.close();  
\}  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
\}  
  
\} catch (SQLException e) \{  
e.printStackTrace();  
\} finally\{  
try \{  
rs.close();  
stmt.close();  
conn.close();  
\} catch (SQLException e) \{  
e.printStackTrace();  
\}  
\}  
\}  
  
  
public static void main(String\[\] s)\{  
DBManager manager = new DBManager();  
String localPath = "E:/testpics";  
try \{  
manager.getPic(localPath);  
\} catch (IOException e) \{  
e.printStackTrace();  
\}  
\}  
  
\}