mongoDB 连接-java

四、java

 

详细参数：http://mongodb.github.io/mongo-java-driver/3.4/driver/tutorials/connect-to-mongodb/

 

添加依赖：

<dependency>
     <groupId>org.mongodb</groupId> 
    <artifactId>mongo‐java‐driver</artifactId>                 
    <version>3.4.3</version> 
</dependency>    

 测试程序

public void testConnection(){ 
//创建mongodb 客户端 
MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
 //或者采用连接字符串
 
//MongoClientURI connectionString = new MongoClientURI("mongodb://root:root@localhost:27017"); 

//MongoClient mongoClient = new MongoClient(connectionString); 
//连接数据库
MongoDatabase database = mongoClient.getDatabase("test"); 

// 连接collection MongoCollection<Document> collection = database.getCollection("student"); 

//查询第一个文档 
Document myDoc = collection.find().first();

 //得到文件内容 json串 
String json = myDoc.toJson(); 
System.out.println(json); }