如何在不使用谷歌地图的情况下获取特定城市、街道或位置的纬度和经度? 例如,用户输入的城市名称是“金奈”,我需要显示该城市的纬度和经度。如何做到这一点?
如何在不使用谷歌地图的情况下获取特定城市、街道或位置的纬度和经度? 例如,用户输入的城市名称是“金奈”,我需要显示该城市的纬度和经度。如何做到这一点?
我曾经遇到过同样的问题。最终,我通过从服务器端获取经纬度来解决了这个问题。这个链接提供了从Java中获取经纬度的示例代码。希望能对某些人有所帮助。
private static final String GEOCODE_REQUEST_URL = "http://maps.googleapis.com/maps/api/geocode/xml?sensor=false&";
private static HttpClient httpClient = new HttpClient(new MultiThreadedHttpConnectionManager());
String strLatitude;
String strLongtitude;
public void getLongitudeLatitude(String address) {
try {
StringBuilder urlBuilder = new StringBuilder(GEOCODE_REQUEST_URL);
if (StringUtils.isNotBlank(address)) {
urlBuilder.append("&address=").append(URLEncoder.encode(address, "UTF-8"));
}
final GetMethod getMethod = new GetMethod(urlBuilder.toString());
try {
httpClient.executeMethod(getMethod);
Reader reader = new InputStreamReader(getMethod.getResponseBodyAsStream(), getMethod.getResponseCharSet());
int data = reader.read();
char[] buffer = new char[1024];
Writer writer = new StringWriter();
while ((data = reader.read(buffer)) != -1) {
writer.write(buffer, 0, data);
}
String result = writer.toString();
System.out.println(result.toString());
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource();
is.setCharacterStream(new StringReader("<"+writer.toString().trim()));
Document doc = db.parse(is);
strLatitude = getXpathValue(doc, "//GeocodeResponse/result/geometry/location/lat/text()");
System.out.println("Latitude:" + strLatitude);
strLongtitude = getXpathValue(doc,"//GeocodeResponse/result/geometry/location/lng/text()");
System.out.println("Longitude:" + strLongtitude);
} finally {
getMethod.releaseConnection();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private String getXpathValue(Document doc, String strXpath) throws XPathExpressionException {
XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression expr = xPath.compile(strXpath);
String resultData = null;
Object result4 = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result4;
for (int i = 0; i < nodes.getLength(); i++) {
resultData = nodes.item(i).getNodeValue();
}
return resultData;
}