Question

当我尝试从桌面上的Java应用程序通过Java API访问大查询时，我遇到了问题。代码是：

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.bigquery.Bigquery;
import com.google.api.services.bigquery.BigqueryScopes;
import com.google.api.services.bigquery.model.GetQueryResultsResponse;
import com.google.api.services.bigquery.model.QueryRequest;
import com.google.api.services.bigquery.model.QueryResponse;
import com.google.api.services.bigquery.model.TableCell;
import com.google.api.services.bigquery.model.TableRow;

import java.io.IOException;
import java.util.List;
import java.util.Scanner;


public class GettingStarted {

  public static Bigquery createAuthorizedClient() throws IOException {
    HttpTransport transport = new NetHttpTransport();
    JsonFactory jsonFactory = new JacksonFactory();
    GoogleCredential credential = GoogleCredential.getApplicationDefault(transport, jsonFactory);

    if (credential.createScopedRequired()) {
      credential = credential.createScoped(BigqueryScopes.all());
    }

    return new Bigquery.Builder(transport, jsonFactory, credential)
        .setApplicationName("Bigquery Samples")
        .build();
  }

  private static List<TableRow> executeQuery(String querySql, Bigquery bigquery, String projectId)
      throws IOException {
    QueryResponse query =
        bigquery.jobs().query(projectId, new QueryRequest().setQuery(querySql)).execute();

    // Execute it
    GetQueryResultsResponse queryResult =
        bigquery
            .jobs()
            .getQueryResults(
                query.getJobReference().getProjectId(), query.getJobReference().getJobId())
            .execute();

    return queryResult.getRows();
  }

  private static void printResults(List<TableRow> rows) {
    System.out.print("\nQuery Results:\n------------\n");
    for (TableRow row : rows) {
      for (TableCell field : row.getF()) {
        System.out.printf("%-50s", field.getV());
      }
      System.out.println();
    }
  }

  public static void main(String[] args) throws IOException {
    Scanner sc;
    if (args.length == 0) {
      sc = new Scanner(System.in);
    } else {
      sc = new Scanner(args[0]);
    }
    String projectId="glassy-land-140915";

    Bigquery bigquery = createAuthorizedClient();

    List<TableRow> rows =
        executeQuery(
            "SELECT corpus as unique_words "
                + "FROM [bigquery-public-data:samples.shakespeare] LIMIT 10",
            bigquery,
            projectId);

    printResults(rows);
  }
}

异常

Exception in thread "main" java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.New(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(Unknown Source)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:77)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:283)
at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:384)
at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:489)
at com.google.api.client.auth.oauth2.Credential.intercept(Credential.java:217)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:868)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
at GettingStarted.executeQuery(GettingStarted.java:38)
at GettingStarted.main(GettingStarted.java:73)

Answer 1

您也可以在java客户端使用代理 java -Dhttp.proxyHost = -Dhttp.proxyPort = .... -jar you_bg_client.jar

Answer 2

问题是网络中的防火墙阻止访问谷歌云。使用不同的网络并获取结果。

通过Java客户端API连接到谷歌大查询

异常

2 个答案: