Question

找到我的问题的答案：对于那些有同样问题的人。

解答：使用HTTP servlet时，我需要在WEB-INF / lib目录中安装jar。否则我可以将它们保存在java构建路径（库）下。因此，在eclispe中，右键单击lib，然后添加Google API和select BigQuery。

我正在使用大查询测试谷歌应用引擎。

当我将其作为应用程序运行时，我能够在eclipse中运行大查询，但是当我将其作为HttpServlet运行时，我不断收到以下错误！

java.lang.NoClassDefFoundError：com / google / api / client / json / JsonFactory

以下是我正在使用的确切代码。

package com.hw3.test;

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 javax.servlet.http.*;
import java.util.List;
import java.util.Scanner;

@SuppressWarnings("serial")
public class HelloWord3Servlet extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {


        Bigquery bigquery = createAuthorizedClient();  //If i comment this out i will get the text below, else i get the error from the title.

        resp.setContentType("text/plain");
        resp.getWriter().println("\nQuery Results:\n------------\n");

    }

    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();
    }

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

        // Depending on the environment that provides the default credentials
        // (e.g. Compute Engine, App
        // Engine), the credentials may require us to specify the scopes we need
        // explicitly.
        // Check for this case, and inject the Bigquery scope if required.
        if (credential.createScopedRequired()) {
            credential = credential.createScoped(BigqueryScopes.all());
        }

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

    public static void main(String[] args) throws IOException {
        Scanner sc;
        if (args.length == 0) {
            // Prompt the user to enter the id of the project to run the queries
            // under
            System.out.print("Enter the project ID: ");
            sc = new Scanner(System.in);
        } else {
            sc = new Scanner(args[0]);
        }
        String projectId = sc.nextLine();

        // Create a new Bigquery client authorized via Application Default
        // Credentials.
        Bigquery bigquery = createAuthorizedClient();

        List<TableRow> rows = executeQuery(
                "SELECT TOP(corpus, 10) as title, COUNT(*) as unique_words " + "FROM [publicdata:samples.shakespeare]",
                bigquery, projectId);

         printResults(rows);
    }

    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();
        }
    }
}

我直接从谷歌网站获得此代码，虽然我稍微修改了它，以便我可以测试app引擎。但是，在使用应用引擎时它无效。

非常感谢任何帮助！

Answer 1

当您作为HttpServlet运行时，听起来好像没有正确配置依赖项。你如何告诉你的应用程序使用哪些依赖项？你想加载什么版本？该版本是否可在Google App Engine中使用？

请注意，您需要的jackson库的特定版本会根据您运行的环境而更改。有关各种环境中所需的依赖项列表，请参阅https://developers.google.com/api-client-library/java/google-http-java-client/setup。

Answer 2

解答：使用HTTP servlet时，我需要在WEB-INF / lib目录中安装jar。否则我可以将它们保存在java构建路径（库）下。因此，在eclispe中，右键单击lib，然后添加Google API并选择BigQuery。

无法让谷歌bigquery和谷歌应用程序引擎工作

2 个答案: