如何使用Java发送Google地方信息搜索请求 [英] How to send a Google Places Search Request with Java

问题描述

我需要按长/纬度搜索Goolge地方信息页，以查找20m范围内的任何银行. 此 Google地方信息文档介绍了如何使用JavaScript进行操作.他们使用的是我在Java中没有的google.maps.LatLng对象.

I need to search Goolge Places Pages by long/lat for any banks in the area of 20m. This Google Places Doc describes how to do it with JavaScript. They are using a google.maps.LatLng Object that i don't have in Java.

现在有人可以调用该服务吗?

Does anyone now how to call the Service?

也许还有用于Goolge Places的Java API?

Maybe there is also an Java API for Goolge Places?

最好的问候， 基督徒.

Best Regards, Christian.

我发现有人像在构造网址这个:

I found someone constructing the url like this:

String url = baseUrl + "location=" + lat + "," + lon + "&" +
                 "radius=" + searchRadius + "&" + types + "&" + "sensor=true" +
                 "&" + "key=" + googleAPIKey;

答案:

由于上述原因，我找到了解决方法.这是发送请求的示例:

I because of the post above i found out how to do it. This is a example how to send the request:

public class GooglePlacesClient
{
    private static final String GOOGLE_API_KEY  = "***";

    private final HttpClient    client          = new DefaultHttpClient();

    public static void main(final String[] args) throws ParseException, IOException, URISyntaxException
    {
        new GooglePlacesClient().performSearch("establishment", 8.6668310, 50.1093060);
    }

    public void performSearch(final String types, final double lon, final double lat) throws ParseException, IOException, URISyntaxException
    {
        final URIBuilder builder = new URIBuilder().setScheme("https").setHost("maps.googleapis.com").setPath("/maps/api/place/search/json");

        builder.addParameter("location", lat + "," + lon);
        builder.addParameter("radius", "5");
        builder.addParameter("types", types);
        builder.addParameter("sensor", "true");
        builder.addParameter("key", GooglePlacesClient.GOOGLE_API_KEY);

        final HttpUriRequest request = new HttpGet(builder.build());

        final HttpResponse execute = this.client.execute(request);

        final String response = EntityUtils.toString(execute.getEntity());

        System.out.println(response);
    }

}

推荐答案

下面是一个更完整的示例(包括JSON解析和一些异常处理)，用于Places API搜索，自动完成和详细信息.它是为Android编写的，但可以轻松移植以供非Android使用(需要包含org.json库并使用其他日志记录). Place类是一个简单的值对象.

Here's a more complete example (includes JSON parsing and some exception handling) for Places API search, autocomplete, and details. It was written for Android, but can be easily ported for non-Android use (need to include org.json libs and use different logging). The Place class is a simple value object.

package com.example.google.places;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;

/**
 * @author saxman
 */
public class PlacesService {
    private static final String LOG_TAG = "ExampleApp";

    private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place";

    private static final String TYPE_AUTOCOMPLETE = "/autocomplete";
    private static final String TYPE_DETAILS = "/details";
    private static final String TYPE_SEARCH = "/search";

    private static final String OUT_JSON = "/json";

    // KEY!
    private static final String API_KEY = "YOUR KEY";

    public static ArrayList<Place> autocomplete(String input) {
        ArrayList<Place> resultList = null;

        HttpURLConnection conn = null;
        StringBuilder jsonResults = new StringBuilder();
        try {
            StringBuilder sb = new StringBuilder(PLACES_API_BASE);
            sb.append(TYPE_AUTOCOMPLETE);
            sb.append(OUT_JSON);
            sb.append("?sensor=false");
            sb.append("&key=" + API_KEY);
            sb.append("&input=" + URLEncoder.encode(input, "utf8"));

            URL url = new URL(sb.toString());
            conn = (HttpURLConnection) url.openConnection();
            InputStreamReader in = new InputStreamReader(conn.getInputStream());

            int read;
            char[] buff = new char[1024];
            while ((read = in.read(buff)) != -1) {
                jsonResults.append(buff, 0, read);
            }
        } catch (MalformedURLException e) {
            Log.e(LOG_TAG, "Error processing Places API URL", e);
            return resultList;
        } catch (IOException e) {
            Log.e(LOG_TAG, "Error connecting to Places API", e);
            return resultList;
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
        }

        try {
            // Create a JSON object hierarchy from the results
            JSONObject jsonObj = new JSONObject(jsonResults.toString());
            JSONArray predsJsonArray = jsonObj.getJSONArray("predictions");

            // Extract the Place descriptions from the results
            resultList = new ArrayList<Place>(predsJsonArray.length());
            for (int i = 0; i < predsJsonArray.length(); i++) {
                Place place = new Place();
                place.reference = predsJsonArray.getJSONObject(i).getString("reference");
                place.name = predsJsonArray.getJSONObject(i).getString("description");
                resultList.add(place);
            }
        } catch (JSONException e) {
            Log.e(LOG_TAG, "Error processing JSON results", e);
        }

        return resultList;
    }

    public static ArrayList<Place> search(String keyword, double lat, double lng, int radius) {
        ArrayList<Place> resultList = null;

        HttpURLConnection conn = null;
        StringBuilder jsonResults = new StringBuilder();
        try {
            StringBuilder sb = new StringBuilder(PLACES_API_BASE);
            sb.append(TYPE_SEARCH);
            sb.append(OUT_JSON);
            sb.append("?sensor=false");
            sb.append("&key=" + API_KEY);
            sb.append("&keyword=" + URLEncoder.encode(keyword, "utf8"));
            sb.append("&location=" + String.valueOf(lat) + "," + String.valueOf(lng));
            sb.append("&radius=" + String.valueOf(radius));

            URL url = new URL(sb.toString());
            conn = (HttpURLConnection) url.openConnection();
            InputStreamReader in = new InputStreamReader(conn.getInputStream());

            int read;
            char[] buff = new char[1024];
            while ((read = in.read(buff)) != -1) {
                jsonResults.append(buff, 0, read);
            }
        } catch (MalformedURLException e) {
            Log.e(LOG_TAG, "Error processing Places API URL", e);
            return resultList;
        } catch (IOException e) {
            Log.e(LOG_TAG, "Error connecting to Places API", e);
            return resultList;
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
        }

        try {
            // Create a JSON object hierarchy from the results
            JSONObject jsonObj = new JSONObject(jsonResults.toString());
            JSONArray predsJsonArray = jsonObj.getJSONArray("results");

            // Extract the Place descriptions from the results
            resultList = new ArrayList<Place>(predsJsonArray.length());
            for (int i = 0; i < predsJsonArray.length(); i++) {
                Place place = new Place();
                place.reference = predsJsonArray.getJSONObject(i).getString("reference");
                place.name = predsJsonArray.getJSONObject(i).getString("name");
                resultList.add(place);
            }
        } catch (JSONException e) {
            Log.e(LOG_TAG, "Error processing JSON results", e);
        }

        return resultList;
    }

    public static Place details(String reference) {
        HttpURLConnection conn = null;
        StringBuilder jsonResults = new StringBuilder();
        try {
            StringBuilder sb = new StringBuilder(PLACES_API_BASE);
            sb.append(TYPE_DETAILS);
            sb.append(OUT_JSON);
            sb.append("?sensor=false");
            sb.append("&key=" + API_KEY);
            sb.append("&reference=" + URLEncoder.encode(reference, "utf8"));

            URL url = new URL(sb.toString());
            conn = (HttpURLConnection) url.openConnection();
            InputStreamReader in = new InputStreamReader(conn.getInputStream());

            // Load the results into a StringBuilder
            int read;
            char[] buff = new char[1024];
            while ((read = in.read(buff)) != -1) {
                jsonResults.append(buff, 0, read);
            }
        } catch (MalformedURLException e) {
            Log.e(LOG_TAG, "Error processing Places API URL", e);
            return null;
        } catch (IOException e) {
            Log.e(LOG_TAG, "Error connecting to Places API", e);
            return null;
        } finally {
            if (conn != null) {
                conn.disconnect();
            }
        }

        Place place = null;
        try {
            // Create a JSON object hierarchy from the results
            JSONObject jsonObj = new JSONObject(jsonResults.toString()).getJSONObject("result");

            place = new Place();
            place.icon = jsonObj.getString("icon");
            place.name = jsonObj.getString("name");
            place.formatted_address = jsonObj.getString("formatted_address");
            if (jsonObj.has("formatted_phone_number")) {
                place.formatted_phone_number = jsonObj.getString("formatted_phone_number");
            }
        } catch (JSONException e) {
            Log.e(LOG_TAG, "Error processing JSON results", e);
        }

        return place;
    }
}

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