1.导包
<dependency> <groupId>org.mongodb</groupId> <artifactId>mongo-java-driver</artifactId> <version>3.2.2</version> </dependency>
2.连接
public static void main(String[] args) { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "192.168.88.134" , 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() ); } }
3.如果有密码
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() ); } }
4.。连接到数据库之后,下面就来连接表
public static void main(String[] args) { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "192.168.88.134" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("guilf1"); System.out.println("Connect to database successfully"); // 相当于书记库里面的表,创建 // mongoDatabase.createCollection("test"); // System.out.println("集合创建成功"); // 创建之后连接表,然后才能进行数据操作 MongoCollection<Document> collection = mongoDatabase.getCollection("test"); System.out.println("集合 test 选择成功"+collection); }catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } }
5. ,所有的操作
package com.guilf.service.impl; import java.util.ArrayList; import java.util.List; import org.bson.Document; import com.mongodb.MongoClient; import com.mongodb.client.FindIterable; import com.mongodb.client.ListCollectionsIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoCursor; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.Filters; public class MongoDBMain { public static void main(String[] args) { try{ // 连接到 mongodb 服务 MongoClient mongoClient = new MongoClient( "192.168.88.134" , 27017 ); // 连接到数据库 MongoDatabase mongoDatabase = mongoClient.getDatabase("guilf1"); System.out.println("Connect to database successfully"); // 相当于书记库里面的表,创建 // mongoDatabase.createCollection("test"); // System.out.println("集合创建成功"); // 创建之后连接表,然后才能进行数据操作 MongoCollection<Document> collection = mongoDatabase.getCollection("test"); System.out.println("集合 test 选择成功"+collection); //document,就相当于插入数据库里面的一条一条数据 //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"); Document document2 = new Document("title", "MongoDB"). append("description", "database"). append("ggg", 100). append("by", "Fly"); List<Document> documents = new ArrayList<Document>(); documents.add(document); documents.add(document2); collection.insertMany(documents); System.out.println("文档插入成功"); //检索所有文档 ,上面插入了,这里查询所有的 /** * 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()); } //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> findIterable1 = collection.find(); MongoCursor<Document> mongoCursor1 = findIterable1.iterator(); while(mongoCursor1.hasNext()){ System.out.println(mongoCursor1.next()); } //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> findIterable2 = collection.find(); MongoCursor<Document> mongoCursor2 = findIterable2.iterator(); while(mongoCursor2.hasNext()){ System.out.println(mongoCursor2.next()); } }catch(Exception e) { System.err.println( e.getClass().getName() + ": " + e.getMessage() ); } } }