Comment développer un lecteur de musique en ligne simple en utilisant MySQL et Java
Développer un lecteur de musique en ligne est un projet stimulant et intéressant. Cet article explique comment utiliser la base de données MySQL et le langage de programmation Java pour créer un lecteur de musique en ligne simple et fournit des exemples de code spécifiques.
1. Analyse des exigences du projet
Avant de commencer le développement, nous devons clarifier les exigences du projet. Un simple lecteur de musique en ligne doit avoir les fonctions suivantes :
2. Conception de la base de données
Afin de stocker des données telles que les utilisateurs, les chansons et les listes de lecture, nous devons concevoir une structure de base de données appropriée. Créez les tables de données suivantes dans la base de données MySQL :
public class UserRegistration { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "INSERT INTO users (username, password) VALUES (?, ?)"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, "username"); pstmt.setString(2, "password"); pstmt.executeUpdate(); System.out.println("User registered successfully!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class UserLogin { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "SELECT * FROM users WHERE username = ? AND password = ?"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, "username"); pstmt.setString(2, "password"); rs = pstmt.executeQuery(); if (rs.next()) { System.out.println("User logged in successfully!"); } else { System.out.println("Invalid username or password!"); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (rs != null) { rs.close(); } if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class SongUpload { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "INSERT INTO songs (title, artist, url) VALUES (?, ?, ?)"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, "song title"); pstmt.setString(2, "artist"); pstmt.setString(3, "song_url"); pstmt.executeUpdate(); System.out.println("Song uploaded successfully!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class SongDelete { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "DELETE FROM songs WHERE id = ?"; pstmt = conn.prepareStatement(sql); pstmt.setInt(1, 1); pstmt.executeUpdate(); System.out.println("Song deleted successfully!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class SongSearch { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "SELECT * FROM songs WHERE title LIKE ?"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, "%keyword%"); rs = pstmt.executeQuery(); while (rs.next()) { System.out.println("Song Title: " + rs.getString("title")); System.out.println("Artist: " + rs.getString("artist")); System.out.println("URL: " + rs.getString("url")); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (rs != null) { rs.close(); } if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class SongPlayer { public static void main(String[] args) { // 根据歌曲URL进行音频播放 } }
public class PlaylistCreate { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "INSERT INTO playlists (name, userId) VALUES (?, ?)"; pstmt = conn.prepareStatement(sql); pstmt.setString(1, "playlist name"); pstmt.setInt(2, 1); pstmt.executeUpdate(); System.out.println("Playlist created successfully!"); } catch (Exception e) { e.printStackTrace(); } finally { try { if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
public class PlaylistManagement { public static void main(String[] args) { Connection conn = null; PreparedStatement pstmt = null; ResultSet rs = null; try { Class.forName("com.mysql.jdbc.Driver"); conn = DriverManager.getConnection("jdbc:mysql://localhost/music_player", "root", "password"); String sql = "SELECT * FROM playlists WHERE userId = ?"; pstmt = conn.prepareStatement(sql); pstmt.setInt(1, 1); rs = pstmt.executeQuery(); while (rs.next()) { System.out.println("Playlist Name: " + rs.getString("name")); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (rs != null) { rs.close(); } if (pstmt != null) { pstmt.close(); } if (conn != null) { conn.close(); } } catch (Exception e) { e.printStackTrace(); } } } }
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