我的代码将 kml 解析到 Google Earth 时有什么问题？

Question

无法将 kml 解析到我的 GE，我的代码有什么问题吗？

我被困在这个问题上两周了，并尝试自己做许多其他方法，

欢迎任何帮助，

Rafael Jesus

google_earth.jsp

var ge;  

google.load("earth", "1");  

function init() {  
    google.earth.createInstance('map3d', initCB, failureCB);  
    window.scroll(0, 10000);  
}  

function initCB(instance) {  
    ge = instance;  
    ge.getWindow().setVisibility(true);  

    // add a navigation control  
    ge.getNavigationControl().setVisibility(ge.VISIBILITY_AUTO);  

    // add some layers  
    ge.getLayerRoot().enableLayerById(ge.LAYER_BORDERS, true);  
    ge.getLayerRoot().enableLayerById(ge.LAYER_ROADS, true);  

    // directs the exact location of the placemark  
    var lookAt = ge.getView().copyAsLookAt(ge.ALTITUDE_RELATIVE_TO_GROUND);  
    lookAt.setLatitude(-15.26108113514467);  
    lookAt.setLongitude(-57.77290131815782);  
    lookAt.setRange(8007066.726300671);  

    ge.getView().setAbstractView(lookAt);  
    ge.getLayerRoot().enableLayerById(ge.LAYER_TERRAIN, false);  

    var kmlString = showPics();  
    // I put a alert in here and show in a window the value "undefined"  
    var kmlObject = ge.parseKml( kmlString );  
    ge.getFeatures().appendChild(kmlObject);  

}

// dwr function that brings the kml with his values  
            // for now it is in hard coded, just for tests!!  
    function showPics() {  
        PainelEarthAjax.geraFotosObra({  
            callback : function(kmlString) {  
                            // I put a alert function in here, and it has openned a window  
                            // with the entire kmlString brought from the java method geraFotosObra().  
                    return kmlString;  
            }  
        });  
    }  

function failureCB(errorCode) {  

}    
google.setOnLoadCallback(init); 

geraFotosObra.java

public String geraFotosObra () throws Exception {  
    try {  
        return new KMLGenerator().getKMLFromObra();  
    } catch (Exception e) {  
        log.error(e.getLocalizedMessage(), e);  
        return null;  
    }  
}  

KMLGenerator.java

public static String getKMLFromObra () {  
    StringBuffer sb = new StringBuffer();  
    sb.append("<?xml version='1.0' encoding='UTF-8'?>");  
    sb.append("<kml xmlns='http://www.opengis.net/kml/2.2' ");  

    sb.append("<Document>");  
    sb.append("<name>ConstruMobil</name>");  

    sb.append("<Style id='defaultStyles'>");  
    sb.append("<IconStyle>");  
    sb.append("<Icon>");  
    sb.append("<href>" + "http://maps.google.com/mapfiles/kml/pal4/icon38.png" + "</href>");  
    sb.append("</Icon>");  
    sb.append("</IconStyle>");  
    sb.append("</Style>");  
    sb.append("</Style>");  

    sb.append("<Placemark>");  
    sb.append("<name>" + "Some name" + "</name>");  
    sb.append("<styleUrl>" + "#defaultStyles"+ "</styleUrl>");  
    sb.append("<altitudeMode>" + "relativeToGround" + "</altitudeMode>");  

    sb.append("<Location>");  
    sb.append("<longitude>" + -122.3599987260313 + "</longitude>");  
    sb.append("<latitude>" + 47.62949781133496 + "</latitude>");  
    sb.append("<altitude>"+ 15.49615401024533 + "</altitude>");  
    sb.append("</Location>");  

    sb.append("<Link>");  
    sb.append("<href>" + "http://localhost:8080/myCompany/lib/img/dubai.jpg" + "</href>");  
    sb.append("</Link>");  
    sb.append("</Model>");  
    sb.append("</Placemark>");  

    sb.append("</Document>");  
    sb.append("</kml>");  

    return sb.toString();  
}  

Answer 1

getKMLFromObra() 函数未返回有效的 XML：

开头 > code> 标签：

sb.append("<kml xmlns='http://www.opengis.net/kml/2.2' ");  

应该是

sb.append("<kml xmlns='http://www.opengis.net/kml/2.2'>");  

为了避免在生成的 XML 中出现此类错误，您应该考虑使用专门的 java 类而不是字符串连接，以下是使用 DOM 或 SAX 生成 XML 的一些示例代码> : http://www.javazoom.net/services/newsletter/xml Generation.html

Answer 2

showPics() 不返回结果。您在回调函数中返回结果。试试这个：

function showPics(ge) {  
    PainelEarthAjax.geraFotosObra({  
        callback : function(kmlString) {  
            var kmlObject = ge.parseKml(kmlString);  
            ge.getFeatures().appendChild(kmlObject);  
        }  
    });  
} 

然后像这样调用它：

ge.getView().setAbstractView(lookAt);  
ge.getLayerRoot().enableLayerById(ge.LAYER_TERRAIN, false);  

showPics(ge);  

Answer 3

您有一个额外的 关闭标记和一个浮动 关闭标记，但没有实际的 Model 元素。

您可以使用 XML 验证器检查输出，例如 Oxygen 甚至仅使用 TextMate 中的 XML 包。

Answer 4

我收到消息“kml 未定义！”

我认为这是 jsp 上的解析问题，我更改了 getKMLFromObra() 只是为了测试，我插入下面的代码：

PS：我在 kml Interactive 上测试了这个 kml 并且它在那里工作，

getKMLFromObra()

StringBuffer sb = new StringBuffer();
    sb.append("<?xml version='1.0' encoding='UTF-8'?>");
    sb.append("<kml xmlns='http://www.opengis.net/kml/2.2' >");
    sb.append("<Placemark>");
    sb.append("<name>Simple placemark</name>");
    sb.append("<description>testing fucking kml</description>");
    sb.append("<Point>");
    sb.append("<coordinates>-122.0822035425683,37.42228990140251,0</coordinates>");
    sb.append("</Point>");
    sb.append("</Placemark>");
    sb.append("</kml>");
    return sb.toString();

下面是我的 google_earth.jsp ：

var ge;

google.load("earth", "1");

function init() {
    google.earth.createInstance('map3d', initCB, failureCB);
    window.scroll(0, 10000);

}

function initCB(instance) {
    ge = instance;
    ge.getWindow().setVisibility(true);

    // add a navigation control
    ge.getNavigationControl().setVisibility(ge.VISIBILITY_AUTO);

    // add some layers
    ge.getLayerRoot().enableLayerById(ge.LAYER_BORDERS, true);
    ge.getLayerRoot().enableLayerById(ge.LAYER_ROADS, true);
    ge.getLayerRoot().enableLayerById(ge.LAYER_TERRAIN, false);

    showPics(ge);
}

function showPics(ge) {
    PainelEarthAjax.geraFotosObra({
        callback : function(kmlString) {
            var kmlObject = ge.parseKml(kmlString);
            ge.getFeatures().appendChild(kmlObject);
        }
    });
    return null;
}

function failureCB(errorCode) {

}
google.setOnLoadCallback(init);