英文:
How can I make a Java app that connects to a MongoDB Atlas Cluster?
问题
我正在尝试制作一个连接到MongoDB Atlas集群的Java应用程序。我目前在使用Eclipse作为我的集成开发环境。
根据我所了解的，我应该使用Maven项目来安装依赖项，但由于我更喜欢下载JAR文件并在项目中使用它们，所以我已经从https://repo1.maven.org/maven2/org/mongodb/下载了3个文件（这些文件是在向MongoDB添加依赖项时Maven下载的）：mongodb-driver-sync-4.1.1；mongodb-drive-core-4.1.1和bson-4.1.1，然后将这些文件添加到了我的Java项目中。使用这种方法，像MongoDatabase和MongoClient这样的东西都能正常工作，但问题是，每当我尝试使用MongoCollection<Document> name = database.getCollection("collection")时，我会收到“无法将Document解析为类型”的错误，就好像IDE无法识别它一样。值得注意的是，当我尝试使用MongoClientURI时，我得到了相同的错误。
我已经尝试创建一个带有之前提到的依赖关系的Maven项目，它可以正常工作，我不会从Document或MongoClientURI中获得错误，但是当我在Maven创建的“main”文件夹中创建一个类并尝试执行它时，我会收到“启动错误，编辑器不包含主类型”的错误消息，当然，这个类包含主方法。
如果我尝试将类移动到src/main/java（顺便说一句，这是它最初创建的位置），我会得到与使用Java项目时相同的错误。
（请注意，MongoDB是Java项目，而Mongo是Maven项目）
我猜我可能做错了什么，所以我想我会坚持使用Java项目（还考虑到我想使用Window Builder，但似乎无法使其与Maven一起工作）。
我知道内容比较多，但你们能指导我正确的方向吗？提前谢谢。
英文:
I'm trying to make a Java app that connects to a MongoDB Atlas cluster. I'm currently using Eclipse as my IDE.
From what I've read I'm supposed to use a Maven project to install dependencies, but since I prefer downloading JAR files and using them in my project I've downloaded 3 files (which are the ones that Maven downloads when you add the dependency for MongoDB): mongodb-driver-sync-4.1.1; mongodb-drive-core-4.1.1 and bson-4.1.1 from https://repo1.maven.org/maven2/org/mongodb/ and then added those files to my Java project. Using this method things like MongoDatabase and MongoClient work fine, but the problem is that whenever I try to use MongoCollection <Document> name = database.getCollection("collection") I get the error "Document cannot be resolved to a type", as if the IDE wouldn't recognize it. It's also worth noting that when trying to use MongoClientURI I get the same error.
I've tried creating a Maven project with the dependency mentioned before and it works just fine, I don't get errors from Document nor MongoClientURI, but when I create a class in the "main" folder that Maven creates and try to execute it I get a message error saying "launch error editor does not contain a main type", which of course, the class contains.
If I try to move the class to src/main/java (which by the way it's where it's first created) I get the same error as when using the Java project
(Note that MongoDB is the Java project and Mongo is the Maven project)
Guess I'm doing something wrong, so I guess I'll stick with a Java project (also given the fact that I want to use Window Builder and I can't seem to make it work with Maven).
I know it's a lot, but could you guys point me in the right direction? Thanks in advance.
答案1
得分: 0
好的，显然我没有导入org.bson.*，其中包含了Document类...所以这个问题解决了。
英文:
Okay, apparently I wasn't importing org.bson.* , which contains the Document class... So that's solved
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