Java实现对Mysql的图片存取操作

 1 import java.io.*;
 2 import java.sql.*;
 3 public class LoadStoreBLOB {
 4     public static void main(String[] args) {
 5         DBConnection     DB = new DBConnection();    //负责连接MySQl数据库的类
 6         Connection         con = null;
 7         PreparedStatement     ps = null;
 8         ResultSet      rs = null;
 9         InputStream    in = null; 
10         try {
11             //从本地硬盘硬盘读取一张图片保存到数据库
12             con=DB.getConn();
13             in=new FileInputStream("sdf.png");
14             ps=con.prepareStatement("insert into test.phototest values(?,?)");
15             ps.setInt(1,2);
16             ps.setBinaryStream(2, in, in.available());
17             ps.executeUpdate();
18             in.close();
19             DB.closeConn(con);
20             
21             //从数据库读取图片保存到本地硬盘
22             con=DB.getConn();
23             ps=con.prepareStatement("select * from test.phototest where id=?");
24             ps.setInt(1,2);
25             rs=ps.executeQuery();
26             rs.next();    //将光标指向第一行
27             in=rs.getBinaryStream("photo");
28             byte[] b=new byte[in.available()];    //新建保存图片数据的byte数组
29             in.read(b);
30             OutputStream out=new FileOutputStream("222.jpg");
31             out.write(b);
32             out.flush();
33             out.close();
34             DB.closeConn(con);
35         } 
36         catch (Exception e) {
37             System.out.println("Error::"+e);
38         }
39     }
40 }