Java uses MongoDB

1. Connect your MongoDB First

See if there is a problem with the connection, code

public class MongoDB2 {private static mongodatabase mongodatabase = null;private static int port = 27017;private static St Ring UserName = "XX";p rivate static string password= "XX";p rivate static string database = "GATP";p rivate static string ho  St= "XXX";/** * MONGO DB connection * * */public void Mongoconnect () {try {//host and port for conversion encryptiondecryption decryption = new Encryptiondecryption (); ServerAddress serveraddress = new ServerAddress (host, Port); list<serveraddress> addresses = new arraylist<serveraddress> (); Addresses.add (serveraddress); Mongocredential credential = mongocredential.createcredential (Username,database, Password.tochararray ()); List<mongocredential> credentials = new arraylist<mongocredential> (); Credentials.add (credential);// Get MongoDB connection via connection authentication mongoclient mongoclient = new Mongoclient (addresses, credentials); mongodatabase = Mongoclient.getdatabase (database); Log.loginfo (mongodatabase);} catch (Exception e) {//Todo:handle exceptione.printstacktrace ();}}public static void Main (string[] args) {MongoDB2 db=new MongoDB2 ();d b.mongoconnect ();//Confirm connection is correct} 

The Mogodb ID will be displayed when the connection is successful, and the error will show the authentication failure

Case of connection failure

Success will show

2. Inserting data into the MOGODB

encapsulates the method insertcollection, inserting a numeric, string,

public boolean insertcollection (String CollectionName, list<document> documents) {Boolean insertresult = false; Try {mongocollection<document> collection = mongodatabase.getcollection (CollectionName); Collection.insertmany (documents); insertresult = true;} catch (Exception e) {//Todo:handle exceptione.printstacktrace ();} return insertresult;}    public static void Main (string[] args) {MongoDB2 db=new MongoDB2 ();d b.mongoconnect ();//Verify that the connection is correct date day=new date (); SimpleDateFormat df = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");//Generate JSON string jsonobject JSON = new Jsonobject (); Json.put ("id", "1"); Json.put ("name", "Zhang San"); Json.put ("pwd", "123456"); SYSTEM.OUT.PRINTLN (JSON);D ocument testdocument = new Document () Testdocument.put ("Times", Df.format (day));// Insert Time Testdocument.put ("name", "Zhangjun"); Insert name Testdocument.put ("info", json.tostring ()); Insert JSON string list<document> documents = new arraylist<document> ();d ocuments.add (testdocument); Db.insertcollection ("Test_log_info", documents);} 

　　

3. Querying data

/** * Get Collection * * @param collectionname * Set name * @param testdocument * conditions, support many pairs of conditions * @return * */publi C mongocursor<document> GetCollection (String collectionname, Document testdocument) {mongocursor<document > mongocursor = null;try {mongocollection<document> collection = Mongodatabase.getcollection (CollectionName) ; finditerable<document> resultdocument = Collection.find (testdocument); mongocursor = ResultDocument.iterator () ;} catch (Exception e) {//Todo:handle exceptione.printstacktrace ();} return mongocursor;}  public static void Main (string[] args) {MongoDB2 db=new MongoDB2 ();d b.mongoconnect ();//Confirm connection Correct document Testdocument = new Document (); Testdocument.put ("Name", "Zhangjun"); mongocursor<document> resultdocument = db.getcollection ("Test_log_info", testdocument); while ( Resultdocument.hasnext ()) {System.out.println (Resultdocument.next ());//Get All SYSTEM.OUT.PRINTLN ( Resultdocument.next (). Get ("_id")); Get a Value}}

Java uses MongoDB