在Java程序中使用javascript调用HTML程序_Java_Javascript_Html

在Java程序中使用javascript调用HTML程序

java javascript html

在Java程序中使用javascript调用HTML程序,java,javascript,html,Java,Javascript,Html,我正在尝试从java程序运行一个带有javascript的HTML文件 Map.html <!DOCTYPE html> <html> <head> <meta name="viewport" content="initial-scale=1.0, user-scalable=no"> <meta charset="utf-8"> <title>Circles</title>

我正在尝试从java程序运行一个带有javascript的HTML文件

Map.html
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Circles</title>
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
    </style>

   <script type="text/javascript" src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
    <script>
// This example creates circles on the map, representing
// populations in North America.

// First, create an object containing LatLng and population for each city.
var citymap = [
      ['Chicago', 41.878113, -87.629798, 4],
      ['New York', 40.714352, -74.005973, 5],
      ['Los Angeles', 34.052234, -118.243684, 3],
      ['Vancouver',49.25, -123.1, 2],
      ['Oregon', 45, -120, 1]
    ];
var cityCircle;

function initialize() {
  // Create the map.
  var mapOptions = {
    zoom: 4,
    center: new google.maps.LatLng(37.09024, -95.712891),
    mapTypeId: google.maps.MapTypeId.TERRAIN
  };

  var map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  // Construct the circle for each value in citymap.
  // Note: We scale the area of the circle based on the population.
      var fillcolor=[];
      fillcolor[0]='#FF0000';fillcolor[1]='#FFFF00'; fillcolor[2]='#FF00FF';    fillcolor[3]='#00FF00';
      var loop=0;
     for (i = 0; i < citymap.length; i++) {  
    var populationOptions = {
      strokeColor: '#000000',
      strokeOpacity: 0.8,
      strokeWeight: 2,

      fillColor: fillcolor[loop],
      fillOpacity: 0.35,
      map: map,
      center: new google.maps.LatLng(citymap[i][1], citymap[i][2]),
      radius: Math.sqrt(citymap[i][3]) * 100000
    };

    // Add the circle for this city to the map.
    cityCircle = new google.maps.Circle(populationOptions);
   // cityCircle = new google.maps.Circle(populationOptions1);
    loop=loop+1;


  }
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <div id="map-canvas"></div>
  </body>
</html>

但是这个程序什么都不做，并抛出下面的错误

Exception in thread "main" java.lang.NullPointerException
    at google.api.search.RunJs.main(RunJs.java:28)

有没有更好的方法从Java调用该html程序并在浏览器上显示该html？谁能帮我一下吗？

只执行javascript脚本。它不处理HTML

可以使用在浏览器中打开Html页面：
p.S.您会得到
NullPointerException
，因为变量
引擎
在您的代码中是
null
。
要获取非空的
引擎
，请使用，例如
nashorn
name

manager.getEngineByName("nashorn");

“html”
在默认情况下是无效的参数（当然，您可以使用方法注册自定义引擎，但不需要它）

Desktop.getDesktop().browse(new File("map.html").toURI());

manager.getEngineByName("nashorn");