1.如果直接把檔案、圖片儲存到資料庫，存取效率非常低，而且大量消耗資料庫儲存空間，因此我們只需要儲存檔案路徑即可。

2.通過檔案選擇器獲取檔案的路徑

3.執行SQL語句將檔案路徑新增到資料庫。

4.程式碼演示讀取檔案

package com.JDBC;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import
 
 java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileSystemView;
public class testFileChooserSelectPath {

    String url ="jdbc:mysql://localhost:3306/test"
 
; 
    String driver="com.mysql.jdbc.Driver";
    String user = "root"; 
    String password = "root";
    Connection conn=null;
    PreparedStatement ps=null;
    ResultSet resultSet=null;
    File selectedFile=null;

    String contextPath;
    public  void connectionDB(){

         try {
                Class.forName(driver);
                conn = DriverManager.getConnection(url, user, password);
                System.out.println("Successfully connected"
 
);
            } catch (ClassNotFoundException e) {

                e.printStackTrace();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

    }

    public void SelectPathInsertIntoDB(){

        JFileChooser jfc = new JFileChooser(FileSystemView.getFileSystemView().getHomeDirectory());
        int returnValue = jfc.showSaveDialog(null);

        if (returnValue == JFileChooser.APPROVE_OPTION) {
            selectedFile = jfc.getSelectedFile();
            System.out.println(selectedFile.getAbsolutePath());
        }
        String path=selectedFile.getAbsolutePath();
        System.out.println(path);

        try {
            //連線資料庫再操作
            conn = DriverManager.getConnection(url, user, password);
            String insertsql="insert into tb_Path(path) value(?)";
            ps=conn.prepareStatement(insertsql);
            ps.setString(1, path);
            ps.executeUpdate();
            System.out.println("檔案路徑成功插入資料庫");
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 


    }

    public void ReadPathFromDB(){

        try {
            conn = DriverManager.getConnection(url, user, password);
            String selectsql="select path from tb_Path where id=?";
            ps=conn.prepareStatement(selectsql);
            ps.setInt(1,12);
            ResultSet rs = ps.executeQuery();
            while(rs.next()){
             contextPath = rs.getString("path");
             System.out.println(contextPath);
            }
            File f = new File(contextPath);
            //使用FileReader讀取檔案內容出現亂碼
//          FileReader fr=new FileReader(f);
//          while(fr.read()!=-1){
//              char ch=(char) fr.read();
//              System.out.print(ch);
//          }
//          fr.close();
//   
         FileInputStream fi=new new FileInputStream(f);
         BufferedReader br=null;
         br=new BufferedReader(newInputStreamReader( fi,"UTF-8"));  
           String line = null;  
           while ((line = br.readLine()) != null) {  
                System.out.println(line); 
           }  

        } 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();
        }


    }

    public static void main(String[] args) {
         testFileChooserSelectPath  t=new  testFileChooserSelectPath ();
         //t.SelectPathInsertIntoDB();
         t. ReadPathFromDB();

    }

}