import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCTest {
    
    public static void main(String[] args) throws IOException  {
        
        String driver = "com.mysql.jdbc.Driver";
        String url = "jdbc:mysql://127.0.0.1:3306/tuzi?characterEncoding=UTF-8";
        String user = "root";
        String pass = "";
        try
        {
            Class.forName(driver);    //加载驱动
            //连接数据库
            Connection conn = DriverManager.getConnection(url,user,pass);
            if(!conn.isClosed())
            {
                System.out.println("Connection Success!");
                //statement 用来执行sql语句
                Statement statement = conn.createStatement();
                //要执行的sql
                String sql = "select * from BST";
                //结果集
                ResultSet rs = statement.executeQuery(sql);
                String tuzi = null;
                String luobo = null;
                while(rs.next())
                {
                    tuzi = rs.getString("tuzi");        //tuzi是个int型 主键
                    luobo = rs.getString("luobo");        //这个是blob 型
                System.out.println(tuzi +" " +luobo);
                }
        /*        这个不行....
                FileInputStream fis = new FileInputStream("C:\\6140\\mysql\\src\\tuzi.jpeg");
                byte[] rtt = new byte[fis.available()];
                fis.read(rtt);
                fis.close();
        */        
                String sqlxx = "insert into BST(tuzi,luobo) values (?,?)";
                PreparedStatement pstmt=conn.prepareStatement(sqlxx);
                FileInputStream fi=new FileInputStream("C:\\6140\\mysql\\src\\tuzi.jpeg");
                pstmt.setInt(1, 521521);
                //pstmt.setBinaryStream(2,fi,fi.available());    也行
                pstmt.setBlob(2,fi,fi.available());               //也行
                pstmt.execute();         
                conn.close();
            }    
        }catch(ClassNotFoundException e)
        {
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

将图片存入数据库【java实现】