Java operation MongoDB quick start tutorial

https://github.com/mongodb/mongo-java-driver/downloads Just download the jar package of hundreds of K. I downloaded mongo-2.9.0-RC2.jar 389K After downloading, put it into the java project and import it Take the previous test Start mongo. Then write a java program package com.javaer.mongo; import java.net.UnknownHostException; import java.util.Set; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.Mongo; public class SimpleConnection { /** * @param args * @throws UnknownHostException */ public static void main(String[] args) throws UnknownHostException { Mongo m = new Mongo(); /** * Other connection methods * Mongo m = new Mongo(“localhost”); * Mongo m = new Mongo(“localhost”,27017); * Mongo m = new Mongo(Arrays.asList(new ServerAddress(“localhost”, 27017), New ServerAddress(“localhost”, 27018), New ServerAddress(“localhost”, 27019))); */ DB db = m.getDB(“yuexiaosheng”); //List all connections       Set colls = db.getCollectionNames(); for (String s : colls) { System.out.println(“connection:” + s); } //Read a piece of data DBCollection coll = db.getCollection(“mycollection”); DBObject myDoc = coll.findOne(); System.out.println(myDoc); /** //Insert a piece of data BasicDBObject doc = new BasicDBObject(); Doc.put(“title”,”tom is 2.8″); Doc.put(“online”,”true”);        coll.insert(doc); */ //Read the total number of collection records System.out.println(coll.getCount()); //Traverse collection records DBCursor cursor = coll.find(); try {   while(cursor.hasNext()) { System.out.println(cursor.next()); } } finally { Cursor.close(); } System.out.println(“——————————————- —————————-“); //Search for a record…