public class URLClassLoaderTest { private static Connection conn; public static Connection getConn(String url,String user,String pass) throws Exception{ if(conn ==null){ URL[] urls = {new URL("file:D:\\mysql-connector-java-5.1.8.jar")}; // 以默认的ClassLoader作为父ClassLoader,创建URLClassLoader URLClassLoader myClassloader = new URLClassLoader(urls); Driver driver = (Driver)myClassloader.loadClass("com.mysql.jdbc.Driver").newInstance(); // 创建一个设置JDBC连接属性的 Properties对象 Properties properties = new Properties(); properties.setProperty("user", user); properties.setProperty("password", pass); // 调用Driver对象的connect方法来取得数据库连接 conn = driver.connect(url, properties); } return conn; } public static void main(String[] args) throws Exception { Connection mysqlConn = getConn("jdbc:mysql://localhost:3306/mysql", "root", "admin123"); System.out.println(mysqlConn); Statement createStatement = mysqlConn.createStatement(); ResultSet resultSet = createStatement.executeQuery("select * from user"); while(resultSet.next()){ String name = resultSet.getString("User"); System.out.println(name); } mysqlConn.close(); } }
URLClassLoader入门使用
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转载自blog.csdn.net/leadseczgw01/article/details/54862288
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