Java sql server数据库连接成功

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

 public class JavaE2 {
     public static void main(String[] args) {
         Connection conn;
         Statement stmt;
         ResultSet rs;
         String url = "jdbc:sqlserver://localhost:1433;DatabaseName=test;";
         String sql = "select * from student";

             try {
                 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); 

             } catch (Exception ex) {
                 System.out.println("数据库加载失败");
             }

         try {
             // 连接数据库
             conn = DriverManager.getConnection(url, "sa", "sa");
             // 建立Statement对象
             stmt = conn.createStatement();
             /**
              * Statement createStatement() 创建一个 Statement 对象来将 SQL 语句发送到数据库。
              */
             // 执行数据库查询语句
             rs = stmt.executeQuery(sql);
             /**
              * ResultSet executeQuery(String sql) throws SQLException 执行给定的 SQL
              * 语句，该语句返回单个 ResultSet 对象
              */
             while (rs.next()) {
                 int id = rs.getInt("SID");
                 String name = rs.getString("SNAME");
                 int age = rs.getInt("SSEX");
                 System.out.println("Sno:" + id + "\tSame:" + name + "\tSage:" + age);
             }
             if (rs != null) {
                 rs.close();
                 rs = null;
             }
             if (stmt != null) {
                 stmt.close();
                 stmt = null;
             }
             if (conn != null) {
                 conn.close();
                 conn = null;
             }
         } catch (SQLException e) {
             e.printStackTrace();
             System.out.println("数据库连接失败");
         }
     }
 }