Quickstart: Call your Bing Custom Search endpoint using Java

Use this quickstart to learn how to request search results from your Bing Custom Search instance. Although this application is written in Java, the Bing Custom Search API is a RESTful web service compatible with most programming languages. The source code for this sample is available on GitHub.

Prerequisites

• A Bing Custom Search instance. For more information, see Quickstart: Create your first Bing Custom Search instance.

• The latest Java Development Kit.

• The Gson library.

Create and initialize the application

1. Create a new Java project in your favorite IDE or editor, and import the following libraries:

   Java

   import java.io.InputStream;
   import java.net.URL;
   import java.net.URLEncoder;
   import java.util.HashMap;
   import java.util.List;
   import java.util.Map;
   import java.util.Scanner;
   import javax.net.ssl.HttpsURLConnection;
   import com.google.gson.Gson;
   import com.google.gson.GsonBuilder;
   import com.google.gson.JsonObject;
   import com.google.gson.JsonParser;
   

2. Create a class named CustomSrchJava, and then create variables for your subscription key, custom search endpoint, and search instance's custom configuration ID.

   Java

   public class CustomSrchJava {
       static String host = "https://api.bing.microsoft.com";
       static String path = "/v7.0/custom/search";
       static String subscriptionKey = "YOUR-SUBSCRIPTION-KEY"; 
       static String customConfigId = "YOUR-CUSTOM-CONFIG-ID";
       static String searchTerm = "Microsoft";  
   ...
   

3. Create another class named SearchResults to contain the response from your Bing Custom Search instance.

   Java

   class SearchResults {
       HashMap<String, String> relevantHeaders;
       String jsonResponse;
       SearchResults(HashMap<String, String> headers, String json) {
           relevantHeaders = headers;
           jsonResponse = json;
       }
   }
   

4. Create a function named prettify() to format the JSON response from the Bing Custom Search API.

   Java

       // pretty-printer for JSON; uses GSON parser to parse and re-serialize
       public static String prettify(String json_text) {
           JsonParser parser = new JsonParser();
           JsonObject json = parser.parse(json_text).getAsJsonObject();
           Gson gson = new GsonBuilder().setPrettyPrinting().create();
           return gson.toJson(json);
       }
   

Send and receive a search request

1. Create a function named SearchWeb() that sends a request and returns a SearchResults object. Create the request url by combining your custom configuration ID, query, and endpoint information. Add your subscription key to the Ocp-Apim-Subscription-Key header.

   Java

   public class CustomSrchJava {
   ...
       public static SearchResults SearchWeb (String searchQuery) throws Exception {
           // construct the URL for your search request (endpoint + query string)
           URL url = new URL(host + path + "?q=" +  URLEncoder.encode(searchTerm, "UTF-8") + "&CustomConfig=" + customConfigId);
           HttpsURLConnection connection = (HttpsURLConnection)url.openConnection();
           connection.setRequestProperty("Ocp-Apim-Subscription-Key", subscriptionKey);
   ...
   

2. Create a stream and store the JSON response in a SearchResults object.

   Java

   public class CustomSrchJava {
   ...
       public static SearchResults SearchWeb (String searchQuery) throws Exception {
           ...
           // receive the JSON body
           InputStream stream = connection.getInputStream();
           String response = new Scanner(stream).useDelimiter("\\A").next();
   
           // construct result object for return
           SearchResults results = new SearchResults(new HashMap<String, String>(), response);
   
           stream.close();
           return results;
       }
   

3. Print the JSON response.

   Java

   System.out.println("\nJSON Response:\n");
   System.out.println(prettify(result.jsonResponse));
   

4. Run the program.

Next steps

Build a Custom Search web app