在 JSP 中输出 Mysql 数据

1.    准备工作

  首先在数据库中插入如下数据

 

数据库脚本：

DROP TABLE IF EXISTS `deviceinfo`;
CREATE TABLE `deviceinfo` (
  `Deviceid` varchar(50) NOT NULL,
  `Longx` varchar(50) NOT NULL,
  `Laty` varchar(50) NOT NULL,
  `Name` varchar(50) NOT NULL,
  `Telephone` varchar(50) NOT NULL,
  `Sos` varchar(50) DEFAULT NULL,
  `Helptime` datetime(6) DEFAULT NULL,
  PRIMARY KEY (`Deviceid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;


INSERT INTO `deviceinfo` VALUES (\'111516513158\', \'116.4\', \'39.9\', \'王一\', \'111111\', null, null);
INSERT INTO `deviceinfo` VALUES (\'156798456321\', \'110\', \'26\', \'王奇\', \'456123\', null, null);
INSERT INTO `deviceinfo` VALUES (\'156974632576\', \'117.2\', \'39.12\', \'王二\', \'222222\', null, null);
INSERT INTO `deviceinfo` VALUES (\'156987456321\', \'102.73\', \'25.04\', \'王三\', \'333333\', \'Y\', \'2017-04-07 10:52:01.000000\');
INSERT INTO `deviceinfo` VALUES (\'456321489657\', \'104.06\', \'30.67\', \'王四\', \'444444\', null, null);
INSERT INTO `deviceinfo` VALUES (\'456987123654\', \'113.23\', \'23.16\', \'王五\', \'555555\', null, null);
INSERT INTO `deviceinfo` VALUES (\'489654785214\', \'110\', \'28\', \'1\', \'2\', null, null);

 

    2. 编写代码

 在 JSP 文件中读取 deviceinfo 表中name 数据。代码如下

<%@ page contentType="text/html;  charset=utf-8" %>   
<%@ page language="java" %>   
<%@ page import="com.mysql.jdbc.Driver" %>   
<%@ page import="java.sql.*" %>   
<%@ page import="java.util.*" %>   
<% 
    String driverName="com.mysql.jdbc.Driver"; //驱动程序     
    String userName="map"; //Mysql用户名   
    String userPasswd="mapadmin"; //密码       
    String dbName="maptest";//数据库名   
    String tableName="deviceinfo";//数据表名     

    String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;
    //连接URL为  jdbc:mysql//服务器地址/数据库名?user=登陆用户名&password=密码
    
    Class.forName("com.mysql.jdbc.Driver").newInstance(); //加载驱动程序  
    Connection conn=DriverManager.getConnection(url);     //获取数据库连接   
    Statement stmt = conn.createStatement();              //创建Statement对象  
    String sql="SELECT * FROM "+tableName;                //SQL语句
    ResultSet rs = stmt.executeQuery(sql);                //执行SQL语句

     List<String> list = new ArrayList<String>();         //list
       while(rs.next()) {    
           list.add (rs.getString("Name"));//将Name加入到list中           
       } 

     out.println("打印 list:");
     out.print(list);
      
     //关闭资源
      rs.close();   
      stmt.close();   
      conn.close(); 
%> 

 

运行该 JSP 页面