通过mongoDB Java驱动程序获取mongoStat

MongoDB Java驱动程序通过使用MongoDB Java Driver，可以获取MongoDB的状态信息。

以下是获取mongoStat信息的示例代码：

import com.mongodb.ConnectionString;

import com.mongodb.client.MongoClient;

import com.mongodb.client.MongoCollection;

import com.mongodb.client.MongoDatabase;

import com.mongodb.client.model.Aggregates;

import com.mongodb.client.model.GraphLookup;

import com.mongodb.client.model.LookupOptions;

import org.bson.Document;

import org.bson.conversions.Bson;

import java.util.Arrays;

public class MongoStat {

public static void main(String[] args) {

    String connectionString = "mongodb+srv://username:password@cluster0.mongodb.net/test?retryWrites=true&w=majority";

    MongoClient mongoClient = new MongoClient(connectionString);

    MongoDatabase database = mongoClient.getDatabase("test");

    MongoCollection<Document> collection = database.getCollection("test");

    Bson match = Aggregates.match(eq("_id", 1));

    Bson unwind = Aggregates.unwind("$document");

    Bson graphLookup = Aggregates.graphLookup(

            "collection1",

            new Document("$id"),

            "collection1",

            new GraphLookup.GraphLookupOptions().depthField("depth"));

    Bson addFields = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFields = Aggregates.unwind("$document");

    Bson addGraphLookup = Aggregates.addGraphLookup(

            "collection2",

            new Document("$id"),

            "collection2",

            new GraphLookup.GraphLookupOptions().depthField("depth"));

    Bson addFieldsAddGraphLookup = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsAddGraphLookup = Aggregates.unwind("$document");

    Bson graphLookupArray = Aggregates.graphLookup(

            "collection1",

            new Document("$id"),

            "collection1",

            new GraphLookup.GraphLookupOptions().depthField("depth"));

    Bson addFieldsGraphLookupArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArray = Aggregates.unwind("$document");

    Bson graphLookupArrayAddFields = Aggregates.graphLookup(

            "collection1",

            new Document("$id"),

            "collection1",

            new GraphLookup.GraphLookupOptions().depthField("depth"));

    Bson addFieldsGraphLookupArrayAddFields = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFields = Aggregates.unwind("$document");

    Bson addFieldsGraphLookupArrayAddFieldsArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFieldsArray = Aggregates.unwind("$document");

    Bson addFieldsGraphLookupArrayAddFieldsArrayArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFieldsArrayArray = Aggregates.unwind("$document");

    Bson addFieldsGraphLookupArrayAddFieldsArrayArrayArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFieldsArrayArrayArray = Aggregates.unwind("$document");

    Bson addFieldsGraphLookupArrayAddFieldsArrayArrayArrayArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFieldsArrayArrayArrayArray = Aggregates.unwind("$document");

    Bson addFieldsGraphLookupArrayAddFieldsArrayArrayArrayArrayArray = Aggregates.addFields(new Document("document",

            new Document("$concatArrays", Arrays.asList("$document", "$lookup"))));

    Bson unwindAddFieldsGraphLookupArrayAddFieldsArrayArrayArrayArrayArray = Aggregates.unwind("$document");

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