在使用客户端操作之前，需要创建用户：

db.createUser({
  user:"hello",
  pwd:"test1234",
  roles:[{
    role:"readWrite",//读写权限
    db:"test"
  }]
});

指定dbpath，logpath，并启用auth登录方式。
mongod --dbpath=/var/lib/mongo --logpath=/var/log/mongodb/mongod.log --logappend --auth

import org.bson.Document;
import org.junit.Test;

import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;

public class MongoDBCase {
    public static final String URI ="mongodb://hello:test1234@192.168.1.107:27017/test";

    /**
     * 查询出所有的集合
     */
    @Test
    public void connectionMongoDB() {
        MongoClientURI uri = new MongoClientURI(URI);
        MongoClient client = new MongoClient(uri);
        MongoDatabase db = client.getDatabase("test");
        MongoCursor<?> cursor = db.listCollectionNames().iterator();
        while (cursor.hasNext()) {
            System.out.println(cursor.next());
        }
        client.close();

    }

    /**
     * 新增数据
     */
    @Test
    public void addData() {
        MongoClientURI uri = new MongoClientURI(URI);
        MongoClient client = new MongoClient(uri);
        MongoDatabase db = client.getDatabase("test");
        MongoCollection<Document> collection = db.getCollection("newuserlist");
        if (collection == null) {
            db.createCollection("newuserlist");
            collection = db.getCollection("newuserlist");
        }
        Document document = new Document("name", "eve").append("age", 24);
        collection.insertOne(document);
        MongoCursor<Document> cursor = collection.find().iterator();
        while (cursor.hasNext()) {
            Document obj = (Document) cursor.next();

            System.out.println(obj.get("name"));
        }
        client.close();
    }

    /**
     * 更新数据
     */
    @Test
    public void updateData() {
        MongoClientURI uri = new MongoClientURI(URI);
        MongoClient client = new MongoClient(uri);
        MongoDatabase db = client.getDatabase("test");
        MongoCollection<Document> collection = db.getCollection("newuserlist");
        BasicDBObject obj = new BasicDBObject().append("name", "eve");
        BasicDBObject updateObj = new BasicDBObject().append("$set", new BasicDBObject("name", "evetest"));
        UpdateResult result = collection.updateOne(obj, updateObj);
        System.out.println("更新的条数:" + result.getMatchedCount());
        client.close();
    }

    /**
     * 删除数据
     */
    @Test
    public void deleteData() {
        MongoClientURI uri = new MongoClientURI(URI);
        MongoClient client = new MongoClient(uri);
        MongoDatabase db = client.getDatabase("test");
        MongoCollection<Document> collection = db.getCollection("newuserlist");
        BasicDBObject obj = new BasicDBObject().append("name", "evetest");
        DeleteResult result = collection.deleteOne(obj);
        System.out.println("删除的条数:" + result.getDeletedCount());
        client.close();
    }
}