Java中获取MongoDB连接的方法详解

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());
  }
}

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