我目前有一个名为JDBC 1的程序,它连接到一个mysql数据库。该程序返回一个字符串。我想把这个字符串插入JSP页面。但是,当我尝试使用netbeans创建一个servlet时,它给了我一堆html预设。我无法使用PHP,因为我没有安装在我的Tomcat上。我正在使用netbeans IDE。如何将java程序连接到JSP页面
这是Java应用程序
//STEP 1. Import required packages
import java.sql.*;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
public class JDBCExample1 {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/maps";
// Database credentials
static final String USER = "root";
static final String PASS = "root";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager
.getConnection("jdbc:mysql://localhost:3306/maps","root", "root");
System.out.println("Connected database successfully...");
//STEP 4: Execute a query
System.out.println("Creating statement...");
stmt = conn.createStatement();
String sql = "SELECT locname,latitude,longitude FROM location";
ResultSet rs = stmt.executeQuery(sql);
//STEP 5: Extract data from result set
while(rs.next()){
//Retrieve by column name
double latitude = rs.getDouble("latitude");
double longitude = rs.getDouble("longitude");
String locname = rs.getString("locname");
//Display values
System.out.print(latitude);
System.out.print(longitude);
System.out.print(locname);
}
rs.close();
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(stmt!=null)
conn.close();
}catch(SQLException se){
}// do nothing
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample1
它返回的数字和地点从我的数据库字符串。现在我想把这个字符串插入到这个JSP页面中,这样我就可以创建一个数组来使用我从mysql数据库中提取的坐标来填充地图。
的JSP
<%--
Document : gogolemaps
Created on : Sep 19, 2014, 12:48:35 PM
Author : bsebat
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var layers=[];
layers[0] = new google.maps.KmlLayer('http://www.hpc.ncep.noaa.gov/kml/fop/fopbody.kml',
{preserveViewport: true});
layers[1] = new google.maps.KmlLayer('http://www.nhc.noaa.gov/gis/forecast/archive/latest_wsp34knt120hr_tenthDeg.kmz',
{preserveViewport: true});
layers[2] = new google.maps.KmlLayer('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/2.5_month_depth_link.kml',
{preserveViewport: true});
layers[3] = new google.maps.KmlLayer('http://activefiremaps.fs.fed.us/data/kml/conus_latest_lg_incidents.kml',
{preserveViewport: true});
layers[4] = new google.maps.KmlLayer('http://w1.weather.gov/tcig/Tornado.kml?random=115233',
{preserveViewport: true});
var map;
function initialize() {
var latlng = new google.maps.LatLng(40.744771, -73.3171305);
var myOptions = {
zoom: 10,
center: latlng,
mapTypeIds: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
for(var i=0;i < locations.length;i++) {
var marker = new google.maps.Marker({position: locations[i].latlng,
map:map, title:locations[i].name});}
}
function toggleLayers(i)
{
if(layers[i].getMap()==null) {
layers[i].setMap(map);
}
else {
layers[i].setMap(null);
}
document.getElementById('status').innerHTML += "toggleLayers("+i+") [setMap("+layers[i].getMap()+"] returns status: "+layers[i].getStatus()+"<br>";
}
</script>
</head>
<body onload="initialize()">
Flood <input type="checkbox" id="layer_01" onclick="toggleLayers(0);"/>
Hurricane<input type="checkbox" id="layer_02" onclick="toggleLayers(1);"/>
Earthquake<input type="checkbox" id="layer_03" onclick="toggleLayers(2);"/>
Fire<input type="checkbox" id="layer_04" onclick="toggleLayers(3);"/>
Tornado<input type="checkbox" id="layer_05" onclick="toggleLayers(4);"/>
<div id="map_canvas" style="height:800px; width:800px;"></div>
<div id="status"></div>
<div id="value">
</body>
</html>
感谢您的帮助,您可以提供!
这段代码的错误甚至不知道从哪里开始。看起来你已经两次粘贴了JDBCExample1,而忽略了JSP。但JDBCExample1代码是最麻烦的。 – duffymo 2014-09-19 18:48:37
代码正常工作并返回一个字符串。我只是问如何将该字符串放入JSP页面。我对代码的功能没有任何问题。 – user3856234 2014-09-19 18:50:42
“正常工作”对我而言并不重要。你的代码应该有很多问题。 – duffymo 2014-09-19 18:55:36