Question

我想在AWS Elastic Beanstalk环境中发布我的Dynamic Web Project。我做了很多尝试和错误，发现我的问题的原因是下面的Scriptlet。一旦我删除它，我的网站工作。（也许很有趣：我可以在没有问题的情况下使用scriptlet在tomcat localhost服务器上发布我的项目。

Scriptlet中：

<%
Twitter_String TS = new Twitter_String();
String TwitterString = TS.Twitter_Stringbuilder();
%>
  var heatmapdata = [<%=TwitterString%>];

我真的查了所有内容，但无法找出为什么scriptlet不能在beanstalk环境中运行，而是在tomcat localhost服务器上运行。 My Beanstalk环境运行“运行Tomcat 7 Java 7的64位Amazon Linux 2015.03 v2.0.0”。我的Tomcat localhost也是版本7.请帮帮我。

我无法发布我的项目结构图片。但这是我的代码。我还在WEB-INF lib文件夹中包含了所有必需的.jars。

的index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ page import="AP.Twitter.Twitter_String"%>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Heatmaps</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
      #panel {
        background-color: #fff;
        border: 1px solid #999;
        left: 25%;
        padding: 5px;
        position: absolute;
        top: 10px;
        z-index: 5;
      }
    </style>
  </head>

  <body>
    <div id="panel">
      <button onclick="toggleHeatmap()">Toggle Heatmap</button>
      <button onclick="changeGradient()">Change gradient</button>
      <button onclick="changeRadius()">Change radius</button>
      <button onclick="changeOpacity()">Change opacity</button>
    </div>
    <div id="map"></div>

    <script>


var map, heatmap;

function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 2,
    center: {lat: 37.775, lng: -122.434},
    mapTypeId: google.maps.MapTypeId.SATELLITE
  });


  <%
Twitter_String TS = new Twitter_String();
String TwitterString = TS.Twitter_Stringbuilder();
%>
  var heatmapdata = [<%=TwitterString%>];


  heatmap = new google.maps.visualization.HeatmapLayer({
    data: heatmapdata,
    map: map
  });
}

function toggleHeatmap() {
  heatmap.setMap(heatmap.getMap() ? null : map);
}

function changeGradient() {
  var gradient = [
    'rgba(0, 255, 255, 0)',
    'rgba(0, 255, 255, 1)',
    'rgba(0, 191, 255, 1)',
    'rgba(0, 127, 255, 1)',
    'rgba(0, 63, 255, 1)',
    'rgba(0, 0, 255, 1)',
    'rgba(0, 0, 223, 1)',
    'rgba(0, 0, 191, 1)',
    'rgba(0, 0, 159, 1)',
    'rgba(0, 0, 127, 1)',
    'rgba(63, 0, 91, 1)',
    'rgba(127, 0, 63, 1)',
    'rgba(191, 0, 31, 1)',
    'rgba(255, 0, 0, 1)'
  ];
  heatmap.set('gradient', heatmap.get('gradient') ? null : gradient);
}

function changeRadius() {
  heatmap.set('radius', heatmap.get('radius') ? null : 50);
}

function changeOpacity() {
  heatmap.set('opacity', heatmap.get('opacity') ? null : 0.2);
}

    </script>
    <script async defer
        src="https://maps.googleapis.com/maps/api/js?signed_in=true&libraries=visualization&callback=initMap">
    </script>
  </body>
</html>

DataBaseConnect，JAVA

package AP.Twitter;


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

public abstract class DataBaseConnect {

    protected static Connection getConnection() throws SQLException {
        try {
            Class.forName("org.postgresql.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        };
        return DriverManager.getConnection("jdbc:postgresql://*****",
                "postgres", "*****");
    }
}

Twitter_String.java

package AP.Twitter;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;



public class Twitter_String extends DataBaseConnect{

        public String Twitter_Stringbuilder() throws SQLException{

        String query = new StringBuilder().append("SELECT * from tswholeworld").toString();
        Connection con = getConnection();
        PreparedStatement ps = con.prepareStatement(query);
        ResultSet rs = ps.executeQuery();
        StringBuilder stringBuilder = new StringBuilder();
        String finalString;


        try {
            while(rs.next()) {
                String lat = rs.getString(3);
                String lon = rs.getString(4);

                stringBuilder.append("new google.maps.LatLng("+lat+", "+lon+"), ");


            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        finalString = stringBuilder.toString();
        return finalString;


}
}

在AWS Beanstalk环境中使用scriptlet发布.jsp

0 个答案: