MongoDB Java

Environment Configuration

If you want to program in Java using MongoDB, you need to make sure you have installed the Java environment and MongoDB JDBC driver.

Examples in this section when Mongo 3.x or later.

You can refer to this site's Java tutorial to install the Java program. Now let's test your MongoDB JDBC driver is installed.

First you must download mongo jar package, download address: http://mongodb.github.io/mongo-java-driver/ , be sure to download the latest version.
You will need to mongo-java-driver-3.2.2.jar (find a suitable version) included in your classpath. .
Domestic mongodb-driver jar Download: http://central.maven.org/maven2/org/mongodb/mongo-java-driver/

Connect to the database

Connect to the database, you need to specify the database name, if the specified database does not exist, mongo database will be created automatically.

Connecting to the database Java code is as follows:

import com.mongodb.MongoClient;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
       // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
       
         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
       System.out.println("Connect to database successfully");
        
      }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
     }
   }
}

Now, let's compile and run the program and connect to the database test.

You can change the MongoDB JDBC driver path according to your actual environment.

This example will start MongoDB JDBC package mongo-java-driver-3.2.2.jar in the local directory:

$ javac -cp .:mongo-java-driver-3.2.2.jar MongoDBJDBC.java
$ java -cp .:mongo-java-driver-3.2.2.jar MongoDBJDBC
Connect to database successfully
Authentication: true

This example Mongo database without requiring user name and password authentication. If your Mongo need to verify the user name and password, you can use the following code:

import java.util.ArrayList;  
import java.util.List;  
import com.mongodb.MongoClient;  
import com.mongodb.MongoCredential;  
import com.mongodb.ServerAddress;  
import com.mongodb.client.MongoDatabase;  
  
public class MongoDBJDBC {  
    public static void main(String[] args){  
        try {  
            //连接到MongoDB服务 如果是远程连接可以替换“localhost”为服务器所在IP地址  
            //ServerAddress()两个参数分别为 服务器地址 和 端口  
            ServerAddress serverAddress = new ServerAddress("localhost",27017);  
            List<ServerAddress> addrs = new ArrayList<ServerAddress>();  
            addrs.add(serverAddress);  
              
            //MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码  
            MongoCredential credential = MongoCredential.createScramSha1Credential("username", "databaseName", "password".toCharArray());  
            List<MongoCredential> credentials = new ArrayList<MongoCredential>();  
            credentials.add(credential);  
              
            //通过连接认证获取MongoDB连接  
            MongoClient mongoClient = new MongoClient(addrs,credentials);  
              
            //连接到数据库  
            MongoDatabase mongoDatabase = mongoClient.getDatabase("databaseName");  
            System.out.println("Connect to database successfully");  
        } catch (Exception e) {  
            System.err.println( e.getClass().getName() + ": " + e.getMessage() );  
        }  
    }  
}

Create a collection

We can use com.mongodb.client.MongoDatabase class createCollection () to create a collection

The following code fragment:

import com.mongodb.MongoClient;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
      // 连接到 mongodb 服务
      MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
         
       
      // 连接到数据库
      MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
      System.out.println("Connect to database successfully");
      mongoDatabase.createCollection("test");
      System.out.println("集合创建成功");
        
      }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
     }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合创建成功

Gets the collection

We can use getCollection () method to obtain a class com.mongodb.client.MongoDatabase collection

The following code fragment:

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
       // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
       
         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
       System.out.println("Connect to database successfully");
      
       MongoCollection<Document> collection = mongoDatabase.getCollection("test");
       System.out.println("集合 test 选择成功");
      }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
     }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合 test 选择成功

Insert Document

We can use com.mongodb.client.MongoCollection class insertMany () method to insert a document

The following code fragment:

import java.util.ArrayList;
import java.util.List;
import org.bson.Document;

import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
         // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
         
         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
         System.out.println("Connect to database successfully");
         
         MongoCollection<Document> collection = mongoDatabase.getCollection("test");
         System.out.println("集合 test 选择成功");
         //插入文档  
         /** 
         * 1. 创建文档 org.bson.Document 参数为key-value的格式 
         * 2. 创建文档集合List<Document> 
         * 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List<Document>) 插入单个文档可以用 mongoCollection.insertOne(Document) 
         * */
         Document document = new Document("title", "MongoDB").  
         append("description", "database").  
         append("likes", 100).  
         append("by", "Fly");  
         List<Document> documents = new ArrayList<Document>();  
         documents.add(document);  
         collection.insertMany(documents);  
         System.out.println("文档插入成功");  
      }catch(Exception e){
         System.err.println( e.getClass().getName() + ": " + e.getMessage() );
      }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合 test 选择成功
文档插入成功

Retrieve all documents

We can use com.mongodb.client.MongoCollection class find () method to get a collection of all documents.

This method returns a cursor, so you need to traverse the cursor.

The following code fragment:

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
         // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
         
         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
         System.out.println("Connect to database successfully");
         
         MongoCollection<Document> collection = mongoDatabase.getCollection("test");
         System.out.println("集合 test 选择成功");
         
         //检索所有文档  
         /** 
         * 1. 获取迭代器FindIterable<Document> 
         * 2. 获取游标MongoCursor<Document> 
         * 3. 通过游标遍历检索出的文档集合 
         * */  
         FindIterable<Document> findIterable = collection.find();  
         MongoCursor<Document> mongoCursor = findIterable.iterator();  
         while(mongoCursor.hasNext()){  
            System.out.println(mongoCursor.next());  
         }  
      
      }catch(Exception e){
         System.err.println( e.getClass().getName() + ": " + e.getMessage() );
      }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合 test 选择成功
Document{{_id=56e65fb1fd57a86304fe2692, title=MongoDB, description=database, likes=100, by=Fly}}

Update Documentation

You can use com.mongodb.client.MongoCollection class updateMany () method to update the collection of documents.

The following code fragment:

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
         // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );
         
         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
         System.out.println("Connect to database successfully");
         
         MongoCollection<Document> collection = mongoDatabase.getCollection("test");
         System.out.println("集合 test 选择成功");
         
         //更新文档   将文档中likes=100的文档修改为likes=200   
         collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));  
         //检索查看结果  
         FindIterable<Document> findIterable = collection.find();  
         MongoCursor<Document> mongoCursor = findIterable.iterator();  
         while(mongoCursor.hasNext()){  
            System.out.println(mongoCursor.next());  
         }  
      
      }catch(Exception e){
         System.err.println( e.getClass().getName() + ": " + e.getMessage() );
      }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合 test 选择成功
Document{{_id=56e65fb1fd57a86304fe2692, title=MongoDB, description=database, likes=200, by=Fly}}

Remove the first document

To delete a document in the collection of the first, first you need to use com.mongodb.DBCollection class findOne () method to get the first document, and then use the remove method to delete.

The following code fragment:

import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;

public class MongoDBJDBC{
   public static void main( String args[] ){
      try{   
         // 连接到 mongodb 服务
         MongoClient mongoClient = new MongoClient( "localhost" , 27017 );

         // 连接到数据库
         MongoDatabase mongoDatabase = mongoClient.getDatabase("mycol");  
         System.out.println("Connect to database successfully");

         MongoCollection<Document> collection = mongoDatabase.getCollection("test");
         System.out.println("集合 test 选择成功");

         //删除符合条件的第一个文档  
         collection.deleteOne(Filters.eq("likes", 200));  
         //删除所有符合条件的文档  
         collection.deleteMany (Filters.eq("likes", 200));  
         //检索查看结果  
         FindIterable<Document> findIterable = collection.find();  
         MongoCursor<Document> mongoCursor = findIterable.iterator();  
         while(mongoCursor.hasNext()){  
           System.out.println(mongoCursor.next());  
         }  
           
      }catch(Exception e){
        System.err.println( e.getClass().getName() + ": " + e.getMessage() );
     }
   }
}

Compile and run the above program, the output results are as follows:

Connect to database successfully
集合 test 选择成功

More operations, refer to: http://mongodb.github.io/mongo-java-driver/3.0/driver/getting-started/quick-tour/

Reference document: http: //blog.csdn.net/ererfei/article/details/50857103

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Next: MongoDB PHP

MongoDB Tutorial

MongoDB Advanced Tutorial

MongoDB Java

Connect to the database

Create a collection

Gets the collection

Insert Document

Retrieve all documents

Update Documentation

Remove the first document