Google Calendar API V3 Java：无法对日历使用“primary”：get [英] Google Calendar API V3 Java: Unable to use 'primary' for Calendars:get

问题描述

我是Google Calendar V3 Java API的新手。我在Java开发，使用Eclipse。到目前为止，我已经成功了：

1. 获取特定Google帐户中所有不同日历的CalendarList摘要


2. 使用日历ID作为标识符，获取特定Google帐户中的某个日历的CalendarList摘要。

现在，我想探索日历，而不是CalendarList。我试着实现日历get方法。但是，我面临一个问题。

Google教程将此示例作为示例代码：

 日历日历= service.calendars（）。get（'primary'）。execute（）; 
 System.out.println（calendar.getSummary（））;但是，Eclipse突出显示primary，并说它是一个无效字符常量。 
 
 
 
我试图将其改为字符串primary，Eclipse突出显示整行，表示存在类型不匹配。
 
 
 
我非常不确定从Google的教程中给出的primary数组中真正需要什么。我应该用主日历的日历ID替换它吗？我试过，既作为一个字符串和一个字符数组，但我继续从Eclipse获取编译错误。 
 
 
 
这是我的代码：
  public static void getCalendarSummary String calendarID，Calendar service）throws IOException {
 Calendar calendar = service.calendars（）。get（primary）。execute（）; 
 System.out.println（calendar.getSummary（））; 
} 
  
任何人都能告诉我我做错了什么？我已经搜索了所有的Google教程参考，但未能得出结论。谢谢。 
 
 
 
这是指向Google教程的链接： https://developers.google.com/google-apps/calendar/v3/reference/calendars/get?hl=fr  
 
 
 
编辑：
运行程序后，这是我得到的。前两种方法工作正常，并提供正确的结果。但是，我得到一个错误的方法有问题 - 未解决的编译问题 - 无效的字符常量。这是整个响应：
 转到以下地址：
 https://accounts.google.com/o /oauth2/auth?client_id=369332843116-gr8ct1guerlf1fudpgivfjv43h0oleip.apps.googleusercontent.com&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code&scope=https://www.googleapis.com/auth/calendar 
'code'url参数是什么？ 
 4 / LvuhiV9Qb_gzCgXmkveIw2kfbOFA.gtXwZ0hWA0QRcp7tdiljKKa1LV4tkQI 
 GooCal 
 ID：[e-mail] 
摘要：截止日期
 ID：[e-mail]。 COM 
摘要：日历1 
 ID：[e-mail] 
摘要：LightUp 
 ID：i.*****@gmail.com 
摘要：个人活动
 ID：w*****@gmail.com 
摘要：w*****@gmail.com 
 ID：[e-mail]。 google.com 
摘要：A队**********  - 轨道项目
 ID：[e-mail] 
摘要：TechTouch  -  GG修复
 ID：[e-mail] 
摘要：GooCal 
 ID：en.singapore#[e-mail] 
摘要：在假期新加坡
异常线程mainjava.lang.Error：未解决的问题编译：
无效字符常量
 
在SimpleCalendarTest.getCalendarSummary（SimpleCalendarTest.java:100）
在SimpleCalendarTest.main（SimpleCalendarTest.java:81）
  
这是我的整个代码，如果它将帮帮我。 ：）
  import java.io.IOException; 
 import java.util.Collections; 
 import java.util.Scanner; 
 import java.util.Set; 
 
 import com.google.api.client.auth.oauth2.AuthorizationCodeFlow; 
 import com.google.api.client.auth.oauth2.AuthorizationCodeRequestUrl; 
 import com.google.api.client.auth.oauth2.AuthorizationCodeTokenRequest; 
 import com.google.api.client.auth.oauth2.Credential; 
 import com.google.api.client.auth.oauth2.TokenResponse; 
 import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow; 
 import com.google.api.client.http.HttpRequestInitializer; 
 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.jackson.JacksonFactory; 
 import com.google.api.services.calendar.Calendar; 
 import com.google.api.services.calendar.CalendarScopes; 
 import com.google.api.services.calendar.model.CalendarList; 
 import com.google.api.services.calendar.model.CalendarListEntry; 
 import com.google.api.services.calendar.model。*; 
 
 
 public class SimpleCalendarTest {
 public static void main（String [] args）throws IOException {
 //将在每个步骤中使用的两个全局变量。 
 HttpTransport httpTransport = new NetHttpTransport（）; 
 JsonFactory jsonFactory = new JacksonFactory（）; 
 
 //创建授权码流程管理器
 Set< String> scope = Collections.singleton（CalendarScopes.CALENDAR）; 
 String clientId =xxxxxxx; 
 String clientSecret =xxxxxxx; 
 
 //使用工厂模式来创建代码流
 AuthorizationCodeFlow.Builder codeFlowBuilder = 
新GoogleAuthorizationCodeFlow.Builder（
 httpTransport，
 jsonFactory，
 clientId，
 clientSecret，
 scope 
）; 
 AuthorizationCodeFlow codeFlow = codeFlowBuilder.build（）; 
 
 //设置代码流以在servlet中使用虚拟用户
 //，这可以是会话ID 
 String userId =ipeech; 
 
 //redirect到认证url 
 String redirectUri =urn：ietf：wg：oauth：2.0：oob 
 AuthorizationCodeRequestUrl authorizationUrl = codeFlow.newAuthorizationUrl（）; 
 authorizationUrl.setRedirectUri（redirectUri）; 
 System.out.println（转到以下地址：）; 
 System.out.println（authorizationUrl）; 
 
 //使用作为url参数返回的代码
 //请求授权令牌
 System.out.println（什么是'code'url参数？）; 
 String code = new Scanner（System.in）.nextLine（）; 
 
 AuthorizationCodeTokenRequest tokenRequest = codeFlow.newTokenRequest（code）; 
 tokenRequest.setRedirectUri（redirectUri）; 
 TokenResponse tokenResponse = tokenRequest.execute（）; 
 
 //现在，使用令牌和用户ID，我们有凭据
 Credential credential = codeFlow.createAndStoreCredential（tokenResponse，userId）; 
 
 //凭据可用于初始化http请求
 HttpRequestInitializer initializer = credential; 
 //因此用于初始化日历服务
 Calendar.Builder serviceBuilder = new Calendar.Builder（
 httpTransport，jsonFactory，initializer）; 
 serviceBuilder.setApplicationName（GooCal）; 
 Calendar calendar = serviceBuilder.build（）; 
 
 //获取一些数据
 String calendarID =[e-mail]; 
 getCalendarListSummary（calendarID，calendar）; 
 getAllCalendarListSummary（calendar）; 
 getCalendarSummary（calendarID，calendar）; 
} 
 
 public static void getCalendarListSummary（String calendarID，Calendar calendar）throws IOException {
 CalendarListEntry calendarListEntry = calendar.calendarList（）。get（calendarID）.execute 
 System.out.println（calendarListEntry.getSummary（））; 
} 
 
 public static void getAllCalendarListSummary（Calendar calendar）throws IOException {
 Calendar.CalendarList.List listRequest = calendar.calendarList（）。list（）; 
 CalendarList feed = listRequest.execute（）; 
 for（CalendarListEntry entry：feed.getItems（））{
 System.out.println（ID：+ entry.getId（））; 
 System.out.println（Summary：+ entry.getSummary（））; 
} 
} 
 
 
 public static void getCalendarSummary（String calendarID，Calendar service）throws IOException {
 Calendar calendar = service.calendars（）。get （'primary'）。execute（）; 
 System.out.println（calendar.getSummary（））; 
} 
} 
  
 ：）
 
 
 
编辑2：当我将primary替换为primary时，这是我收到的错误消息。 
 什么是'code'url参数？ 
 4 / LvuhiV9Qb_gzCgXmkveIw2kfbOFA.gtXwZ0hWA0QRcp7tdiljKKa1LV4tkQI 
 GooCal 
 ID：[e-mail] 
摘要：DEADLINES 
 ID：[e-mail]。 com 
摘要：日历1 
 ID：[e-mail] 
摘要：LightUp 
 ID：i.*****@gmail.com 
摘要：个人事件
 ID：w*****@gmail.com 
摘要：w*****@gmail.com 
 ID：[e-mail]。 google.com 
摘要：团队A **********  - 轨道项目
 ID：[e-mail] 
摘要：TechTouch  -  GG Fix 
 ID：[e-mail] 
摘要：GooCal 
 ID：en.singapore#[e-mail] 
摘要：节假日新加坡
线程main中的异常java.lang.Error：未解决的编译问题：
类型不匹配：无法从com.google.api.services.calendar.model.Calendar转换为com.google.api .services.calendar.Calendar 
方法getSummary（）未定义类型Calendar 
 
在SimpleCalendarTest.getCalendarSummary（SimpleCalendarTest.java:100）
在SimpleCalendarTest.main（SimpleCalendarTest .java：81）
  
看起来存在类型不匹配。谢谢你的帮助！ 
 
 
 
编辑3：将com.google.api.services.calendar.Calendar替换为com.google.api.services.calendar.model.Calendar会导致其他问题。 Eclipse突出显示用于初始化日历服务的代码有问题。 Calendar.Builder无法解析为类型。 
 
 
 $ b 
  Calendar.Builder serviceBuilder = new Calendar.Builder（
 httpTransport，jsonFactory，initializer）; 
  
运行时出现此错误。
 线程main中的异常java.lang.Error：未解决的编译问题：
 Calendar.Builder无法解析为类型
 Calendar.Builder不能在SimpleCalendarTest.main（SimpleCalendarTest.java:73）中解析为类型
 
 
  
感谢您的帮助！
解决方案
将此import com.google.api.services.calendar.Calendar .api.services.calendar.model.Calendar。
 
I'm very new to the Google Calendar V3 Java API. I'm developing in Java, using Eclipse. So far, I have succeeded in:

Getting the CalendarList summaries of all the different calendars inside a particular Google account 
Getting the CalendarList summary of just one of the calendars inside a particular Google account, using the Calendar ID as an identifier. 
Now, I would like to explore Calendars instead of CalendarList. I tried implementing the Calendars get method. However, I am facing a problem. 

Google's tutorial states this as an example code: 
Calendar calendar = service.calendars().get('primary').execute();
System.out.println(calendar.getSummary());
However, Eclipse highlights the 'primary' and says that it is an "Invalid Character Constant". 

I tried changing it into a string "primary" instead, and Eclipse highlights the entire line, saying that there is a type mismatch.

I am very unsure what is really expected from the 'primary' array of strings given in Google's tutorial. Am I supposed to replace it with the calendar ID of the primary calendar? I tried that, both as a string and as an array of characters, but I keep on getting compilation errors from Eclipse. 

Here is my code used: 
public static void getCalendarSummary(String calendarID, Calendar service) throws IOException{ 
    Calendar calendar = service.calendars().get("primary").execute();
    System.out.println(calendar.getSummary());
}
Would anyone be able to enlighten me as to what I'm doing wrong? I have searched all over the Google tutorial references, but failed to come to a conclusion. Thank you. 

This is the link to Google's tutorial: https://developers.google.com/google-apps/calendar/v3/reference/calendars/get?hl=fr

Edit:
After running the program, this is what I get. The first two methods work fine and deliver the right results. However, I get an error for the method in question - unresolved compilation problem - invalid character constant. Here's the entire response:
Go to the following address:
https://accounts.google.com/o/oauth2/auth?client_id=369332843116-gr8ct1guerlf1fudpgivfjv43h0oleip.apps.googleusercontent.com&redirect_uri=urn:ietf:wg:oauth:2.0:oob&response_type=code&scope=https://www.googleapis.com/auth/calendar
What is the 'code' url parameter?
4/LvuhiV9Qb_gzCgXmkveIw2kfbOFA.gtXwZ0hWA0QRcp7tdiljKKa1LV4tkQI
GooCal
ID: [e-mail]
Summary: DEADLINES
ID: [e-mail]
Summary: Calendar 1
ID: [e-mail]
Summary: LightUp
ID: i.*****@gmail.com
Summary: Personal Events
ID: w*****@gmail.com
Summary: w*****@gmail.com
ID: [e-mail]
Summary: Team A********** - Orbital Project
ID: [e-mail]
Summary: TechTouch - GG Fix
ID: [e-mail]
Summary: GooCal
ID: en.singapore#[e-mail]
Summary: Holidays in Singapore
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
    Invalid character constant

    at SimpleCalendarTest.getCalendarSummary(SimpleCalendarTest.java:100)
    at SimpleCalendarTest.main(SimpleCalendarTest.java:81)
Here is my entire code, if it will help. :)
import java.io.IOException;
import java.util.Collections;
import java.util.Scanner;
import java.util.Set;

import com.google.api.client.auth.oauth2.AuthorizationCodeFlow;
import com.google.api.client.auth.oauth2.AuthorizationCodeRequestUrl;
import com.google.api.client.auth.oauth2.AuthorizationCodeTokenRequest;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.auth.oauth2.TokenResponse;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.http.HttpRequestInitializer;
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.jackson.JacksonFactory;
import com.google.api.services.calendar.Calendar;
import com.google.api.services.calendar.CalendarScopes;
import com.google.api.services.calendar.model.CalendarList;
import com.google.api.services.calendar.model.CalendarListEntry;
import com.google.api.services.calendar.model.*;


public class SimpleCalendarTest {
    public static void main(String[] args) throws IOException{
        //Two globals that will be used in each step.
        HttpTransport httpTransport = new NetHttpTransport();
        JsonFactory jsonFactory = new JacksonFactory();

        //Create the authorization code flow manager
        Set<String> scope = Collections.singleton(CalendarScopes.CALENDAR);
        String clientId = "xxxxxxx";
        String clientSecret = "xxxxxxx";

        //Use a factory pattern to create the code flow
        AuthorizationCodeFlow.Builder codeFlowBuilder = 
                new GoogleAuthorizationCodeFlow.Builder(
                        httpTransport, 
                        jsonFactory, 
                        clientId, 
                        clientSecret, 
                        scope
                );
        AuthorizationCodeFlow codeFlow = codeFlowBuilder.build();

        //set the code flow to use a dummy user
        //in a servlet, this could be the session id
        String userId = "ipeech";

        //"redirect" to the authentication url
        String redirectUri = "urn:ietf:wg:oauth:2.0:oob";
        AuthorizationCodeRequestUrl authorizationUrl = codeFlow.newAuthorizationUrl();
        authorizationUrl.setRedirectUri(redirectUri);
        System.out.println("Go to the following address:");
        System.out.println(authorizationUrl);

        //use the code that is returned as a url parameter
        //to request an authorization token
        System.out.println("What is the 'code' url parameter?");
        String code = new Scanner(System.in).nextLine();

        AuthorizationCodeTokenRequest tokenRequest = codeFlow.newTokenRequest(code);
        tokenRequest.setRedirectUri(redirectUri);
        TokenResponse tokenResponse = tokenRequest.execute();

        //Now, with the token and user id, we have credentials
        Credential credential = codeFlow.createAndStoreCredential(tokenResponse, userId);

        //Credentials may be used to initialize http requests
        HttpRequestInitializer initializer = credential;
        //and thus are used to initialize the calendar service
        Calendar.Builder serviceBuilder = new Calendar.Builder(
                httpTransport, jsonFactory, initializer);
        serviceBuilder.setApplicationName("GooCal");
        Calendar calendar = serviceBuilder.build();

        //get some data
        String calendarID = "[e-mail]";
        getCalendarListSummary(calendarID,calendar);
        getAllCalendarListSummary(calendar);
        getCalendarSummary(calendarID,calendar);
    }

    public static void getCalendarListSummary(String calendarID, Calendar calendar) throws IOException{
        CalendarListEntry calendarListEntry = calendar.calendarList().get(calendarID).execute();
        System.out.println(calendarListEntry.getSummary());
    }

    public static void getAllCalendarListSummary (Calendar calendar) throws IOException{
        Calendar.CalendarList.List listRequest = calendar.calendarList().list();
        CalendarList feed = listRequest.execute();
        for(CalendarListEntry entry:feed.getItems()){
            System.out.println("ID: " + entry.getId());
            System.out.println("Summary: " + entry.getSummary());
        }
    }


    public static void getCalendarSummary(String calendarID, Calendar service) throws IOException{ 
        Calendar calendar = service.calendars().get('primary').execute();
        System.out.println(calendar.getSummary());
    }
}
Thanks! :)

Edit 2: When I replace 'primary' with "primary", this is the error message I get. 
What is the 'code' url parameter?
    4/LvuhiV9Qb_gzCgXmkveIw2kfbOFA.gtXwZ0hWA0QRcp7tdiljKKa1LV4tkQI
    GooCal
    ID: [e-mail]
    Summary: DEADLINES
    ID: [e-mail]
    Summary: Calendar 1
    ID: [e-mail]
    Summary: LightUp
    ID: i.*****@gmail.com
    Summary: Personal Events
    ID: w*****@gmail.com
    Summary: w*****@gmail.com
    ID: [e-mail]
    Summary: Team A********** - Orbital Project
    ID: [e-mail]
    Summary: TechTouch - GG Fix
    ID: [e-mail]
    Summary: GooCal
    ID: en.singapore#[e-mail]
    Summary: Holidays in Singapore
Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    Type mismatch: cannot convert from com.google.api.services.calendar.model.Calendar to com.google.api.services.calendar.Calendar
    The method getSummary() is undefined for the type Calendar

    at SimpleCalendarTest.getCalendarSummary(SimpleCalendarTest.java:100)
    at SimpleCalendarTest.main(SimpleCalendarTest.java:81)
It appears that there is a type mismatch. Thanks for your help! 

Edit 3: Replacing import com.google.api.services.calendar.Calendar with com.google.api.services.calendar.model.Calendar causes other problems. Eclipse highlights that the code used to initialize the calendar service has a problem. Calendar.Builder cannot be resolved as a type. 
Calendar.Builder serviceBuilder = new Calendar.Builder(
                httpTransport, jsonFactory, initializer);
When I run, I get this error.
Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    Calendar.Builder cannot be resolved to a type
    Calendar.Builder cannot be resolved to a type

    at SimpleCalendarTest.main(SimpleCalendarTest.java:73)
Thanks for your help!
解决方案
Replace this import com.google.api.services.calendar.Calendar with com.google.api.services.calendar.model.Calendar.

                        
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