我使用谷歌地圖 API 從谷歌地圖 API 獲取 GPS 坐標。我使用與我的老師代碼幾乎相似的代碼，用于使用 api 中的 JSON。他使用來自 darksky 的 api，我使用來自谷歌地圖的 API。我的代碼：package com.company;import org.json.JSONException;import org.json.JSONObject;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.URL;import java.nio.charset.Charset;public class MyCoorGiver {public final String API_URL = "https://maps.googleapis.com/maps/api/geocode/json?address=";private String cityName;private final String apiKey = "&key=";private String fullUrl;private String rawData;JSONObject jsonObject;private double lat;private double lng;public String getFullUrl() { return fullUrl;}public MyCoorGiver(String cityName) { this.cityName = cityName; this.fullUrl = this.API_URL + cityName + this.apiKey;}private JSONObject readFromJsonUrl() throws IOException, JSONException { InputStream is = new URL(this.fullUrl).openStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8"))); String jsonText = readAll(br); jsonObject = new JSONObject(jsonText); return jsonObject;} public String readAll(BufferedReader br) throws IOException { StringBuilder sb = new StringBuilder(); int cp; while((cp = br.read()) != -1){ sb.append(cp); } rawData = sb.toString(); return sb.toString(); } public String getRaw(){ return rawData; } private double getLat() throws IOException, JSONException { JSONObject myData = readFromJsonUrl(); JSONObject location = myData.getJSONObject("location"); double lat = location.getDouble("lat"); return lat; } private double getLng() throws IOException, JSONException { JSONObject myData = readFromJsonUrl(); JSONObject location = myData.getJSONObject("location"); double lng = location.getDouble("lng"); return lng; }
1 回答
米脂
TA貢獻1836條經驗 獲得超3個贊
UPD2： [表示數組，{在JSON語法中表示對象。試試。
private double getLat() throws IOException, JSONException {
JSONObject myData = readFromJsonUrl();
JSONArray results = myData.getJSONArray("results");
JSONObject geometry = results.getJSONObject(0).getJSONObject("geometry");
JSONObject location = geometry.getJSONObject("location");
double lat = location.getDouble("lat");
return lat;
}
UPD：您應該使用readLine()方法而不是read()，嘗試更改您的代碼，如下所示。
public String readAll(BufferedReader br) throws IOException {
StringBuilder sb = new StringBuilder();
String cp;
while ((cp = br.readLine()) != null) {
sb.append(cp);
}
return sb.toString();
}
您可以jsonText在控制臺中打印以查看 JSON 語法是否正確。也許你可以嘗試使用這段代碼。
private JSONObject readFromJsonUrl() throws IOException, JSONException {
InputStream is = new URL(this.fullUrl).openStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText = readAll(br);
//jsonObject = new JSONObject(jsonText);
ObjectMapper objectMapper = new ObjectMapper();
JSONObject jsonObject = objectMapper.readValue(jsonText, JSONObject.class);
return jsonObject;
}
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