>编辑:我有另一个程序,它使用方向服务。它有效。当我在此地理编码工程中使用该代码时,它会引发相同的错误。(Eclipse, Java EE, Tomcat7(
作为参考,这里是请求
http://maps.googleapis.com/maps/api/geocode/json?address=vancouver,bc&sensor=true
这是代码
JSONObject obj = new JSONObject(s);
JSONObject res = obj.getJSONArray("results").getJSONObject(0);
字符串"s"是返回的json。这有效:
System.out.println(obj.getJSONArray("results");
虽然一旦我尝试 getJSONObject(0( 我就会收到错误。在此之前,我一直在与方向服务合作,它发送了一个非常相似的结果。这对我有用。任何建议都非常感谢!这已经吃掉了我晚上几个小时,所以我想我会寻求一些帮助。
String lat = obj.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location").getString("lat");
正如你在这里看到的:
{
"results" : [
{
"address_components" : [
{
"long_name" : "1600",
"short_name" : "1600",
"types" : [ "street_number" ]
},
{
"long_name" : "Amphitheatre Parkway",
"short_name" : "Amphitheatre Pkwy",
"types" : [ "route" ]
},
{
"long_name" : "Mountain View",
"short_name" : "Mountain View",
"types" : [ "locality", "political" ]
},
{
"long_name" : "Santa Clara County",
"short_name" : "Santa Clara County",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "California",
"short_name" : "CA",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "United States",
"short_name" : "US",
"types" : [ "country", "political" ]
},
{
"long_name" : "94043",
"short_name" : "94043",
"types" : [ "postal_code" ]
}
],
"formatted_address" : "1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA",
"geometry" : {
"location" : {
**"lat"** : 37.4223329,
**"lng"** : -122.0844192
},
"location_type" : "ROOFTOP",
"viewport" : {
"northeast" : {
"lat" : 37.4236818802915,
"lng" : -122.0830702197085
},
"southwest" : {
"lat" : 37.4209839197085,
"lng" : -122.0857681802915
}
}
},
"place_id" : "ChIJ2eUgeAK6j4ARbn5u_wAGqWA",
"types" : [ "street_address" ]
}
],
"status" : "OK"
}
lat(Latitude)
和 lng(Longitude)
的类型为 Double
,因此正确的代码(如果您需要纬度和经度作为 String
s(是:
String latitude = Double.toString(jsonTree.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location").getDouble("lat"));
String longitude = Double.toString(jsonTree.getJSONArray("results").getJSONObject(0).getJSONObject("geometry").getJSONObject("location").getDouble("lng"));