用一个jsp实现对数据库发访问
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<%
//驱动程序名
String driverName="com.mysql.jdbc.Driver";
//数据库用户名
String userName="root";
//密码
String userPasswd="123";
//数据库名
String dbName="zzga";
//表名
String tableName="t_device";
//联结字符串
String url="jdbc:mysql://localhost/"+dbName+"?user="+userName+"&password="+userPasswd;
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection=DriverManager.getConnection(url);
Statement statement = connection.createStatement();
String sql="SELECT * FROM "+tableName;
ResultSet rs = statement.executeQuery(sql);
//获得数据结果集合
ResultSetMetaData rmeta = rs.getMetaData();
//确定数据集的列数,亦字段数
int numColumns=rmeta.getColumnCount();
out.print(" 精度               ");
out.print("纬度              ");
out.print(" 地址 ");
out.print("<br>");
// 输出每一个数据值
while(rs.next()) {
out.print(rs.getString(4)+" ");
out.print("|");
out.print(rs.getString(5));
out.print("|");
out.print(rs.getString(3));
out.print("<br>");
}
out.print("数据库操作成功,恭喜你");
rs.close();
statement.close();
connection.close();
%>
</html>