Java中获取MongoDB连接的方法

首先是所需jar包，Maven中的配置如下：

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>bson</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
  	<groupId>org.springframework.data</groupId>
  	<artifactId>spring-data-mongodb</artifactId>
  	<version>1.7.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.9.1</version>
</dependency>

　　获取连接的代码如下（本中用的是模板类）：

List<ServerAddress> addrs = new ArrayList<ServerAddress>();
addrs.add(new ServerAddress(dataSource.getSourceIp(), Integer.valueOf(dataSource.getSourcePort())));
List<MongoCredential> credentials = new ArrayList<MongoCredential>();
credentials.add(MongoCredential.createScramSha1Credential(dataSource.getUsername(), dataSource.getSourceName(), dataSource.getPassword().toCharArray()));
MongoClient mongoClient = new MongoClient(addrs, credentials);
MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongoClient, dataSource.getSourceName());
MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory);
mongoTemplate.getCollectionNames();

　　或者用如下方式获取：

ServerAddress serverAddress = new ServerAddress("192.168.16.121",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("root", "admin", "123456Ab".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("admin");
mongoDatabase.getCollection("test").find().iterator();
// 关闭数据库连接
mongoClient.close();

　　附带简单增删改查的例子：

package test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.junit.Test;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;

import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.WriteResult;

import bean.Book;
import bean.Good;
import bean.ShopDO;
import net.sf.json.JSONObject;

public class MongoTemplateTest {
	public static MongoTemplate mongoTemplate = getMongoTemplate();

	public static void main(String[] args) {
		System.out.println(mongoTemplate.getCollectionNames());
	}

	public static MongoTemplate getMongoTemplate(){
		String host = "192.168.16.121";
		int port = 27017;
		String databaseName = "test";
		String username = "root";
		String password = "123456Ab";

		//ServerAddress(host,port)两个参数分别为 IP地址 端口号
		ServerAddress serverAddress = new ServerAddress(host,port);
        List<ServerAddress> addrs = new ArrayList<ServerAddress>();
        addrs.add(serverAddress);

        //MongoCredential.createScramSha1Credential(username,source,password)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);
		MongoDbFactory mongoDbFactory = new SimpleMongoDbFactory(mongoClient, databaseName);
		MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory);

		return mongoTemplate;
	}

	/**
	 * 插入数据
	 */
	@Test
	public void save(){
		ShopDO shop1 = new ShopDO(100L,"菜鸟教程");
        ShopDO shop2 = new ShopDO(101L,"有道笔记");
        mongoTemplate.save(shop1,"col");
        mongoTemplate.save(shop2,"col");
        System.out.println("mongoDB插入数据成功,集合为col,文档为："+mongoTemplate.getCollection("col"));
	}

	@Test
	public void save1(){
		Book book = new Book(22L,"英语","32.5");
        mongoTemplate.save(book,"col");
	}

	@Test
	public void save2(){
		Good good = new Good(new HashMap<String,String>(){{put("id","1");put("name","动物");}});
        mongoTemplate.save(good,"col");
	}

	@Test
	public void save3(){
		mongoTemplate.save(JSONObject.fromObject("{\"这样\":\"we\",\"好吧\":\"hai\"}"),"col");
		System.out.println("mongoDB插入数据成功,集合为col,文档为："+mongoTemplate.getCollection("col"));
	}

	/**
	 * 查询所有
	 */
	@Test
	public void findAll(){
		List<ShopDO> list = mongoTemplate.findAll(ShopDO.class,"col");
        System.out.println("mongoDB查询数据成功,集合为col,文档为：");
        for (ShopDO shopDO:list){
            System.out.println(shopDO.getNo()+"/"+shopDO.getName());
        }
	}

	/**
	 * 单条件查询
	 */
	@Test
	public void simpleQuery(){
		Query query = Query.query(Criteria.where("no").is(100L));
		List<ShopDO> list = mongoTemplate.find(query,ShopDO.class,"col");
		System.out.println("mongoDB按条件ID查询数据成功,集合为col,文档为：");
		for (ShopDO shopDO:list){
		  System.out.println(shopDO.getNo()+"/"+shopDO.getName());
		}
	}

	/**
	 * 多条件查询
	 */
	@Test
	public void muchQuery(){
		Criteria criteria = new Criteria();
		//or是条件或查询，and是条件与查询
		criteria.orOperator(
		Criteria.where("no").is(100),
		Criteria.where("name").is("菜鸟教程"));
		Query query = new Query(criteria);   //组合查询放入query
		Sort sort = new Sort(new Sort.Order(Sort.Direction.DESC,"no"));  //结果集进行排序
		query.with(sort);
		List<ShopDO> list = mongoTemplate.find(query,ShopDO.class,"col");
		System.out.println("mongoDB组合查询数据成功,集合为col,文档为：");
		for (ShopDO shopDO:list){
		   System.out.println(shopDO.getNo()+"/"+shopDO.getName());
		}
	}

	/**
	 * 分页查询
	 */
	@Test
	public void LimitQuery(){
		Query query = new Query();
		query.skip(1).limit(3);
		List<ShopDO> list = mongoTemplate.find(query,ShopDO.class,"col");
		System.out.println("mongoDB分页查询下标为1开始总共3行数据,集合为col,文档为：");
		for (ShopDO shopDO:list){
		   System.out.println(shopDO.getNo()+"/"+shopDO.getName());
		}
	}

	/**
	 * 模糊查询
	 */
	@Test
	public void LikeQuery(){
		Query query = new Query(Criteria.where("name").regex("菜鸟"));
		List<ShopDO> list = mongoTemplate.find(query,ShopDO.class,"col");
		System.out.println("mongoDB查询名称叫菜鸟的数据成功,集合为col,文档为：");
		  for (ShopDO shopDO:list){
		        System.out.println(shopDO.getNo()+"/"+shopDO.getName());
		    }
		Update update = new Update();
		update.set("name","菜鸟教程old");
		WriteResult wr = mongoTemplate.updateMulti(query,update,"col");
		System.out.println("mongoDB更新数据成功,集合为col,行数为：" + wr.getN());
	}

	/**
	 * 更新
	 */
	@Test
	public void update(){
		Query query = new Query(Criteria.where("no").is(100));
		List<ShopDO> list = mongoTemplate.find(query,ShopDO.class,"col");
		System.out.println("mongoDB查询no为100的数据成功,集合为col,文档为：");
		for (ShopDO shopDO:list){
		   System.out.println(shopDO.getNo()+"/"+shopDO.getName());
		}
		Update update = new Update();
		update.set("name","菜鸟教程new");
		WriteResult wr = mongoTemplate.updateFirst(query,update,"col");
		System.out.println("mongoDB更新数据成功,集合为col,行数为：" + wr.getN());
	}

	/**
	 * 删除
	 */
	@Test
	public void delete(){
		Query query = new Query(Criteria.where("no").is(1));
		WriteResult result = mongoTemplate.remove(query, "col");
		System.out.println("mongoDB删除数据成功,集合为col,行数为：" + result.getN() + "删除的ID为"+result.getUpsertedId());
	}
}