java图片数据库

import java.io.File;
import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class ImageStorage {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            File imageFile = new File("path/to/image.jpg");
            FileInputStream fis = new FileInputStream(imageFile);

            String sql = "INSERT INTO images (name, data) VALUES (?, ?)";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setString(1, "image.jpg");
                pstmt.setBinaryStream(2, fis, (int) imageFile.length());
                pstmt.executeUpdate();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import java.io.FileOutputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class ImageRetrieval {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String sql = "SELECT data FROM images WHERE name = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) {
                pstmt.setString(1, "image.jpg");
                try (ResultSet rs = pstmt.executeQuery()) {
                    if (rs.next()) {
                        try (InputStream is = rs.getBinaryStream("data");
                             FileOutputStream fos = new FileOutputStream("retrieved_image.jpg")) {
                            byte[] buffer = new byte[1024];
                            int bytesRead;
                            while ((bytesRead = is.read(buffer)) != -1) {
                                fos.write(buffer, 0, bytesRead);
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}