使用Java IntelliJ IDEA的YouTube分析API中出现空指针异常？
使用Java IntelliJ IDEA的YouTube分析API中出现空指针异常？ 能给我一个建议吗使用Java IntelliJ IDEA的YouTube分析API中出现空指针异常？,java,Java,使用Java IntelliJ IDEA的YouTube分析API中出现空指针异常？ 能给我一个建议吗 Throwable: null java.lang.NullPointerException at com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191) at com.google.api.client.util.Preconditio
Throwable: null
java.lang.NullPointerException
at com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
at com.google.api.client.util.Preconditions.checkNotNull(Preconditions.java:127)
at com.google.api.client.json.jackson2.JacksonFactory.createJsonParser(JacksonFactory.java:96)
at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:85)
at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:81)
at com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:88)
at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:287)
at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
at com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:570)
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:859)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
at com.google.api.services.samples.youtube.cmdline.analytics.YouTubeAnalyticsReports.main(YouTubeAnalyticsReports.java:87)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.google.api.services.samples.youtube.cmdline</groupId>
<artifactId>samples</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>youtube-api-cmdline-samples</name>
<url>http://maven.apache.org</url>
<properties>
<project.youtube.version>v3-rev107-1.18.0-rc</project.youtube.version>
<project.youtube.analytics.version>v1-rev24-1.17.0-rc</project.youtube.analytics.version>
<project.http.version>1.18.0-rc</project.http.version>
<project.oauth.version>1.18.0-rc</project.oauth.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<repositories>
<repository>
<id>google-api-services</id>
<url>http://google-api-client-libraries.appspot.com/mavenrepo</url>
</repository>
</repositories>
<dependencies>
<!-- YouTube Data V3 support -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-youtube</artifactId>
<version>${project.youtube.version}</version>
</dependency>
<!-- Required for any code that makes calls to the Google Analytics API -->
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-youtubeAnalytics</artifactId>
<version>${project.youtube.analytics.version}</version>
</dependency>
<!-- This dependency is only used for the Topics API sample, which requires the Jackson JSON parser -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.4</version>
</dependency>
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
<version>${project.http.version}</version>
</dependency>
<dependency>
<groupId>com.google.oauth-client</groupId>
<artifactId>google-oauth-client-jetty</artifactId>
<version>${project.oauth.version}</version>
</dependency>
<dependency>
<groupId>com.google.collections</groupId>
<artifactId>google-collections</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<!-- Forces Maven to use Java 1.6 -->
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<compilerArgument></compilerArgument>
</configuration>
</plugin>
</plugins>
</build>
4.0.0
com.google.api.services.samples.youtube.cmdline
样品
0.0.1-快照
罐子
youtube api cmdline示例
http://maven.apache.org
v3-rev107-1.18.0-rc
v1-rev24-1.17.0-rc
1.18.0-rc
1.18.0-rc
UTF-8
谷歌api服务
http://google-api-client-libraries.appspot.com/mavenrepo
com.google.api
谷歌api服务youtube
${project.youtube.version}
com.google.api
谷歌api服务YouTubeAnytics
${project.youtube.analytics.version}
org.codehaus.jackson
杰克逊地图绘制者
1.9.4
com.google.http-client
google-http-client-jackson2
${project.http.version}
com.google.oauth-client
谷歌oauth客户端jetty
${project.oauth.version}
com.google.collections
谷歌收藏
1
maven编译器插件
2.3.2
1.6
1.6
package com.google.api.services.samples.youtube.cmdline.analytics;
import com.google.api.client.auth.oauth2.Credential;
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.samples.youtube.cmdline.Auth;
import com.google.api.services.youtube.YouTube;
import com.google.api.services.youtube.model.Channel;
import com.google.api.services.youtube.model.ChannelListResponse;
import com.google.api.services.youtubeAnalytics.YouTubeAnalytics;
import com.google.api.services.youtubeAnalytics.model.ResultTable;
import com.google.api.services.youtubeAnalytics.model.ResultTable.ColumnHeaders;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.io.PrintStream;
import java.math.BigDecimal;
import java.util.List;
public class YouTubeAnalyticsReports {
/**
* Define a global instance of the HTTP transport.
*/
private static final HttpTransport HTTP_TRANSPORT = new NetHttpTransport();
/**
* Define a global instance of the JSON factory.
*/
private static final JsonFactory JSON_FACTORY = new JacksonFactory();
/**
* Define a global instance of a Youtube object, which will be used
* to make YouTube Data API requests.
*/
private static YouTube youtube;
/**
* Define a global instance of a YoutubeAnalytics object, which will be
* used to make YouTube Analytics API requests.
*/
private static YouTubeAnalytics analytics;
/**
* This code authorizes the user, uses the YouTube Data API to retrieve
* information about the user's YouTube channel, and then fetches and
* prints statistics for the user's channel using the YouTube Analytics API.
*
* @param args command line args (not used).
*/
public static void main(String[] args) {
// These scopes are required to access information about the
// authenticated user's YouTube channel as well as Analytics
// data for that channel.
List<String> scopes = Lists.newArrayList(
"https://www.googleapis.com/auth/yt-analytics.readonly",
"https://www.googleapis.com/auth/youtube.readonly"
);
try {
// Authorize the request.
Credential credential = Auth.authorize(scopes, "analyticsreports");
// This object is used to make YouTube Data API requests.
youtube = new YouTube.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
.setApplicationName("youtube-analytics-api-report-example")
.build();
// This object is used to make YouTube Analytics API requests.
analytics = new YouTubeAnalytics.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
.setApplicationName("youtube-analytics-api-report-example")
.build();
// Construct a request to retrieve the current user's channel ID.
YouTube.Channels.List channelRequest = youtube.channels().list("id,snippet");
channelRequest.setMine(true);
channelRequest.setFields("items(id,snippet/title)");
ChannelListResponse channels = channelRequest.execute();
// List channels associated with the user.
List<Channel> listOfChannels = channels.getItems();
// The user's default channel is the first item in the list.
Channel defaultChannel = listOfChannels.get(0);
String channelId = defaultChannel.getId();
PrintStream writer = System.out;
if (channelId == null) {
writer.println("No channel found.");
} else {
writer.println("Default Channel: " + defaultChannel.getSnippet().getTitle() +
" ( " + channelId + " )\n");
printData(writer, "Views Over Time.", executeViewsOverTimeQuery(analytics, channelId));
printData(writer, "Top Videos", executeTopVideosQuery(analytics, channelId));
printData(writer, "Demographics", executeDemographicsQuery(analytics, channelId));
}
} catch (IOException e) {
System.err.println("IOException: " + e.getMessage());
e.printStackTrace();
} catch (Throwable t) {
System.err.println("Throwable: " + t.getMessage());
t.printStackTrace();
}
}
/**
* Retrieve the views and unique viewers per day for the channel.
*
* @param analytics The service object used to access the Analytics API.
* @param id The channel ID from which to retrieve data.
* @return The API response.
* @throws IOException if an API error occurred.
*/
private static ResultTable executeViewsOverTimeQuery(YouTubeAnalytics analytics,
String id) throws IOException {
return analytics.reports()
.query("channel==" + id, // channel id
"2012-01-01", // Start date.
"2012-01-14", // End date.
"views,uniques") // Metrics.
.setDimensions("day")
.setSort("day")
.execute();
}
/**
* Retrieve the channel's 10 most viewed videos in descending order.
*
* @param analytics the analytics service object used to access the API.
* @param id the string id from which to retrieve data.
* @return the response from the API.
* @throws IOException if an API error occurred.
*/
private static ResultTable executeTopVideosQuery(YouTubeAnalytics analytics,
String id) throws IOException {
return analytics.reports()
.query("channel==" + id, // channel id
"2012-01-01", // Start date.
"2012-08-14", // End date.
"views,subscribersGained,subscribersLost") // Metrics.
.setDimensions("video")
.setSort("-views")
.setMaxResults(10)
.execute();
}
/**
* Retrieve the demographics report for the channel.
*
* @param analytics the analytics service object used to access the API.
* @param id the string id from which to retrieve data.
* @return the response from the API.
* @throws IOException if an API error occurred.
*/
private static ResultTable executeDemographicsQuery(YouTubeAnalytics analytics,
String id) throws IOException {
return analytics.reports()
.query("channel==" + id, // channel id
"2007-01-01", // Start date.
"2012-08-14", // End date.
"viewerPercentage") // Metrics.
.setDimensions("ageGroup,gender")
.setSort("-viewerPercentage")
.execute();
}
/**
* Prints the API response. The channel name is printed along with
* each column name and all the data in the rows.
*
* @param writer stream to output to
* @param title title of the report
* @param results data returned from the API.
*/
private static void printData(PrintStream writer, String title, ResultTable results) {
writer.println("Report: " + title);
if (results.getRows() == null || results.getRows().isEmpty()) {
writer.println("No results Found.");
} else {
// Print column headers.
for (ColumnHeaders header : results.getColumnHeaders()) {
writer.printf("%30s", header.getName());
}
writer.println();
// Print actual data.
for (List<Object> row : results.getRows()) {
for (int colNum = 0; colNum < results.getColumnHeaders().size(); colNum++) {
ColumnHeaders header = results.getColumnHeaders().get(colNum);
Object column = row.get(colNum);
if ("INTEGER".equals(header.getUnknownKeys().get("dataType"))) {
long l = ((BigDecimal) column).longValue();
writer.printf("%30d", l);
} else if ("FLOAT".equals(header.getUnknownKeys().get("dataType"))) {
writer.printf("%30f", column);
} else if ("STRING".equals(header.getUnknownKeys().get("dataType"))) {
writer.printf("%30s", column);
} else {
// default output.
writer.printf("%30s", column);
}
}
writer.println();
}
writer.println();
}
}
package com.google.api.services.samples.youtube.cmdline.analytics；
导入com.google.api.client.auth.oauth2.Credential；
导入com.google.api.client.http.HttpTransport；
导入com.google.api.client.http.javanet.NetHttpTransport；
导入com.google.api.client.json.JsonFactory；
导入com.google.api.client.json.jackson2.JacksonFactory；
导入com.google.api.services.samples.youtube.cmdline.Auth；
导入com.google.api.services.youtube.youtube；
导入com.google.api.services.youtube.model.Channel；
导入com.google.api.services.youtube.model.ChannelListResponse；
导入com.google.api.services.youtubeAnalytics.youtubeAnalytics；
导入com.google.api.services.youtubeAnalytics.model.resultable；
导入com.google.api.services.youtubeAnalytics.model.ResultTable.ColumnHeaders；
导入com.google.common.collect.list；
导入java.io.IOException；
导入java.io.PrintStream；
导入java.math.BigDecimal；
导入java.util.List；
公共类YouTube分析报告{
/**
*定义HTTP传输的全局实例。
*/
私有静态最终HttpTransport HTTP_TRANSPORT=new NetHttpTransport（）；
/**
*定义JSON工厂的全局实例。
*/
私有静态最终JsonFactory JSON_FACTORY=new JacksonFactory（）；
/**
*定义将要使用的Youtube对象的全局实例
*发出YouTube数据API请求。
*/
私有静态YouTube YouTube；
/**
*定义YoutubeAnalytics对象的全局实例，该实例将
*用于发出YouTube分析API请求。
*/
私有静态YouTubeanAnalytics分析；
/**
*此代码授权用户，使用YouTube数据API检索
*有关用户的YouTube频道的信息，然后获取和
*使用YouTube分析API打印用户频道的统计信息。
*
*@param args命令行args（未使用）。
*/
公共静态void main（字符串[]args）{
//这些作用域是访问有关
//已验证用户的YouTube频道以及分析
//该频道的数据。
列表范围=Lists.newArrayList(
"https://www.googleapis.com/auth/yt-analytics.readonly",
"https://www.googleapis.com/auth/youtube.readonly"
);
试一试{
//批准请求。
凭证=授权（作用域，“分析报告”）；
//此对象用于发出YouTube数据API请求。
youtube=new youtube.Builder（HTTP_传输、JSON_工厂、凭证）
.setApplicationName（“youtube分析api报告示例”）
.build（）；
//此对象用于发出YouTube分析API请求。
analytics=new YouTubeAnalytics.Builder（HTTP_传输、JSON_工厂、凭证）
.setApplicationName（“youtube分析api报告示例”）
.build（）；
//构造一个请求以检索当前用户的通道ID。
YouTube.Channels.List channelRequest=YouTube.Channels（）.List（“id，snippet”）；
channelRequest.setMine（true）；
channelRequest.setFields（“项目（id、代码段/标题）”）；
ChannelListResponse channels=channelRequest.execute（）；
//列出与用户关联的频道。
List ListofChannel=channels.getItems（）；
//用户的默认频道是列表中的第一项。
Channel defaultChannel=ListofChannel.get（0）；
字符串channelId=defaultChannel.getId（）；
PrintStream writer=System.out；
if（channelId==null）{
writer.println（“未找到频道”）；
}否则{
writer.println（“默认通道：+defaultChannel.getSnippet（）.getTitle（））+
“（“+channelId+”）\n”）；
printData（作者，“随时间变化的视图”，executeViewsOverTimeQuery（分析，channelId））；
printData（编剧，“顶级视频”，executeTopVideosQuery（分析，渠道ID））；
printData（作者，“人口统计”，执行的人口统计（分析，渠道ID））；
}
}捕获（IOE异常）{
System.err.println（“IOException:+e.getMessage（））；
e、 printStackTrace（）；
}捕获（可丢弃的t）{
System.err.println（“Throwable:+t.getMessage（））；
t、 printStackTrace（）；
}
}
/**
*检索频道每天的视图和唯一查看器。
*
*@param analytics用于访问分析的服务对象
<repositories>
<repository>
<id>google-api-services</id>
<url>http://mavenrepo.google-api-java-client.googlecode.com/hg</url>
</repository>
<repository>
<id>google-api-services</id>
<url>http://google-api-client-libraries.appspot.com/mavenrepo</url>
</repository>
</repositories>