mongodb与java整合

mongodb与java整合需要用到mongodb驱动，如果是maven环境，则添加如下倚赖：

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.2.2</version>
</dependency>

如果是普通的项目，就下载对应的jar包添加到lib目录下面。

 　　　　　　ServerAddress serverAddress = new ServerAddress("localhost", 27017);
            List<ServerAddress> addresses = new ArrayList<ServerAddress>();
            addresses.add(serverAddress);
            // mogodb开启的权限验证
            // 类似 db.auth("userName", "pwd")
            MongoCredential credential = MongoCredential.createCredential("root", "test", "000000".toCharArray());
            List<MongoCredential> credentials = new ArrayList<MongoCredential>();
            credentials.add(credential);
            MongoClient client = new MongoClient(addresses, credentials);
            // 链接到数据库
            // use test
            MongoDatabase mongoDatabase = client.getDatabase("test");
            log.info("创建链接成功");

            //获取集合
            MongoCollection<Document> item = mongoDatabase.getCollection("item_info");
            //像集合中插入元素
             /**
             * 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)
             * */
            List<Document> documents = new ArrayList<Document>();
            Long startTimeStamp = System.currentTimeMillis();
            for(int i = 0; i < 10; i++){
                Document document = new Document("item_id", UUID.randomUUID().toString())
                .append("item_name", "itemName_" + i)
                .append("sku", "sku_" + i)
                .append("price", Double.parseDouble("5") + i)
                .append("desc", "desc_" + "item_name_" + i );
                //documents.add(document);
                item.insertOne(document);

            }
//          item.insertMany(documents);
            Long endTimeStamp = System.currentTimeMillis();
            System.out.println("=============");
            System.out.println("耗费时间:" + ((endTimeStamp - startTimeStamp)) / 1000.0);
            System.out.println("=============");

            //查询
//          Bson condition =
            // 查询价格小于 200 的商品
            FindIterable<Document> results = item.find(Filters.lt("price", 10));
            MongoCursor<Document> iterator = results.iterator();
            int i = 0;
            if(null != results && iterator.hasNext()){

                while(iterator.hasNext()){
                    System.out.println("===================");
                    Document result = iterator.next();
                    System.out.println(result.get("item_id"));
                    System.out.println(result.get("item_name"));
                    System.out.println(result.get("price"));
                    System.out.println("===================");
                    i++;
                }
            }
            // 查总数
            System.out.println(i++);
            System.out.println("<--------------------------->\n");
            //更新操作
            // 更新操作是针对于collection上面的函数，
            UpdateResult s = item.updateMany(Filters.lt("price", 10), new Document("$set",
                    new Document().
                    append("price", 11.5)
                    .append("item_name", "update_item_name")));

            //查询
            FindIterable<Document> updateItems = item.find(Filters.eq("item_name", "update_item_name"));
            MongoCursor<Document> updateIterator = updateItems.iterator();
            i = 0;
            if(null != updateIterator){
                while(updateIterator.hasNext()){
                    Document updateItem = updateIterator.next();

                    System.out.println("===================");
                    System.out.println(updateItem.get("item_id"));
                    System.out.println(updateItem.get("item_name"));
                    System.out.println(updateItem.get("price"));
                    System.out.println("===================");
                    i++;
                }
            }

            System.out.println(s.getModifiedCount());
            // 删除
            DeleteResult delete = item.deleteMany(Filters.eq("item_name", "update_item_name"));
            System.out.println(delete.getDeletedCount());