使用jdbc时,Communications link failure
2020-07-14 06:26
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标题:Communications link failure
若运行后,出现Communications link failure,可以试着启动数据库服务器;
/** * 实例四, * @author dell * */ public class TestDemoJDBC2 { public static void main(String[] args) throws Exception { /** * 方式二,使用反射【运行期间加载】加载驱动 * 优点1,不需要创建Driver对象, * 优点2,若无Driver类,编译期间不会报错,运行时报错 */ // //1.加载厂商驱动 // Class.forName("com.mysql.jdbc.Driver"); // //2.用java的类获取连接 // Connection connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/girls","root","1357"); System.out.println(System.getProperty("user.dir")); //创建Propertise对象 Properties info = new Properties(); //加载jdbc.properties文件 info.load(new FileInputStream("E:/eclipse/Pro01-JDBC02/src/jdbc/jdbc.properties")); // info.list(System.out); String driver=info.getProperty("driver"); String url=info.getProperty("url"); String user=info.getProperty("user"); String password=info.getProperty("password"); //1.加载厂商驱动 Class.forName(driver); //2.用java的类获取连接 Connection connection=DriverManager.getConnection(url,user,password); System.out.println("连接成功"); } }
解决方法:
用如下命令:net start mysql; 【mysql为数据库的名字,也就是安装时自己写的名字】
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