JAVAでAmazon Product Advertising APIを使用するときのメモ(2016/11時点)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class AmazonApiSample {

    public static String searchMusic(String artist) {
        // ダウンロードしたヘルパークラスでオブジェクトの作成
        SignedRequestsHelper helper;
        try {
            // ENDPOINTに確認したURLのドメインを入力
            helper = SignedRequestsHelper.getInstance(AmazonConstants.ENDPOINT, AmazonConstants.AWS_ACCESS_KEY_ID, AmazonConstants.AWS_SECRET_KEY);
        } catch (Exception e) {
            // exceptionの時はnullを返す
            return null;
        }
        // Mapにリクエストのキー情報をつめる
        Map<String, String> params = new HashMap<String, String>();
        params.put("Service", "AWSECommerceService");
        params.put("AWSAccessKeyId", AmazonConstants.AWS_ACCESS_KEY_ID);
        params.put("Version", "2013-08-01");
        params.put("AssociateTag", AmazonConstants.AWS_ASSOCIATETAG);
        params.put("Operation", "ItemSearch");
        params.put("SearchIndex", "Music");
        params.put("Artist", artist);
        params.put("Sort", "-releasedate");
        params.put("ContentType", "text/xml");

        HttpURLConnection httpURLConnection = null;
        BufferedReader bufferedReader = null;

        try{
            // リクエスト処理
            String requestUrl = helper.sign(params);
            URL url = new URL(requestUrl);
            httpURLConnection = (HttpURLConnection)url.openConnection();
            String charSet = "UTF-8";
            String method = "GET";
            httpURLConnection.setRequestMethod( method );
            InputStreamReader inputStreamReader = new InputStreamReader( httpURLConnection.getInputStream(), charSet );
            bufferedReader = new BufferedReader( inputStreamReader );

            // レスポンスのXMLを取得。
            String oneLine = null;
            String responseXml = "";
            while( true ){
                oneLine = bufferedReader.readLine();
                // 行がNULLの場合
                if(oneLine == null){
                    break;
                // レスポンスの文字列へ行を追加
                }else{
                    responseXml += oneLine;
                }
            }
            return responseXml;
        }catch( Exception e ){
            // exceptionの時はnullを返す
            return null;
        }finally{

            if( bufferedReader != null ){
                try{
                    bufferedReader.close();
                }catch( IOException e ){
                    // エラー時は無処理
                }
            }
            if( httpURLConnection != null ){
                httpURLConnection.disconnect();
            }
        }
    }

}