java 链接jdbc

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.ResourceBundle;

 public class ConnnectionUtils {

     private static String dbDriver = ""; //com.mysql.jdbc.Driver
     private static String url = "";      //jdbc\:mysql\://localhost\:3306/dabasename?useUnicode\=true&characterEncoding\=UTF-8
     private static String user = "";     //username
     private static String passw = "";    //password

     static Connection conn=null;

     static {

         ResourceBundle source = ResourceBundle.getBundle("config");  //config.properties
         dbDriver = source.getString("driverClassName");
         url = source.getString("jdbc_url");
         user = source.getString("jdbc_username");
         passw = source.getString("jdbc_password");
     }

     public static Connection getConnection(){
         try {
             // 加载驱动
             Class.forName(dbDriver);
             // 获取链接
             conn = DriverManager.getConnection(url,user,passw);
         } catch (Exception e) {
             e.printStackTrace();
         }

         return conn;
     }

     //使用后关闭链接
     public static void  close(){
         if (conn != null) {
             try {
                 conn.close();
             } catch (SQLException e) {
                 e.printStackTrace();
             }
         }
     }

     public static void main(String[] args) {
         Connection conn = ConnnectionUtils.getConnection();
         System.out.println(conn);
         String sql = "select * from tableName";

         try {
             // 执行SQL
             Statement statement = conn.createStatement();
             // 获得结果集
             ResultSet result = statement.executeQuery(sql);

             //如果有结果集 ，对结果进行处理
             while (result.next()) {
                 String app_url = result.getString("oneStringColumnName");
                 System.out.println(app_url);

             }
             //关闭链接
             ConnnectionUtils.close();
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }
 }

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