java将MP3文件存入数据库并取出

今天药忘吃喽~ 2022-08-13 12:50 150阅读 0赞

package jdbc.demo;
    
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.sql.Blob;
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    
    import javax.sql.rowset.serial.SerialBlob;
    
    import jdbc.utils.JdbcUtils;
    
    import org.apache.commons.io.IOUtils;
    import org.junit.Test;
    
    /*
     * 对mp3进行处理
     */
    public class BigDataDmeo {
    	@Test
    	public void saveMp3() throws Exception{
    		Connection con = JdbcUtils.getConnection();
    		//给出模板
    		String sql = "insert into tab_bin values(?,?,?)";
    		//创建pstmt
    		PreparedStatement pstmt = con.prepareStatement(sql);
    //		设置参数
    		pstmt.setInt(1, 1);
    		pstmt.setString(2, "独角戏.mp3");
    		//把文件变成byte再创建Blob
    		byte[] bytes = IOUtils.toByteArray(new FileInputStream("d:\\独角戏.mp3"));
    		Blob blob = new SerialBlob(bytes);
    		pstmt.setBlob(3, blob);
    		
    		pstmt.executeUpdate();
    	}
    	
    	/*
    	 * 拿到MP3
    	 */
    	@Test
    	public void takeMp3() throws Exception{
    		Connection con = JdbcUtils.getConnection();
    		
    		String sql = "select * from tab_bin";
    		
    		PreparedStatement pstmt = con.prepareStatement(sql);
    		
    		ResultSet rs = pstmt.executeQuery();
    		
    		if(rs.next()){
    			Blob blob = rs.getBlob("data");
    			
    			InputStream in = blob.getBinaryStream();
    			OutputStream out = new FileOutputStream("e:/djx.mp3");
    			IOUtils.copy(in, out);
    		}
    
    	}
    }

将加载数据库的代码分离了

package jdbc.utils;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import java.util.Properties;
    
    public class JdbcUtils {
    	public static Properties props = null; 
    	static{
    		//加载配置文件
    		InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("dbconfig.properties");
    		props = new Properties();
    		try {
    			props.load(in);
    		} catch (IOException e) {
    			throw new RuntimeException(e);
    		}
    		
    		//加载驱动类
    		try {
    			Class.forName(props.getProperty("driverClassName"));
    		} catch (ClassNotFoundException e) {
    			throw new RuntimeException(e);
    		}
    	}
    	
    	public static Connection getConnection() throws SQLException{
    		
    		return DriverManager.getConnection(props.getProperty("url"),props.getProperty("username"), props.getProperty("password"));
    	}
    }