package com.amyyang.mongodb; import com.mongodb.MongoClient; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoCursor; import com.mongodb.client.MongoDatabase; import com.mongodb.client.model.Filters; import org.bson.Document; import org.bson.conversions.Bson; public class MongodbHelper { /* establish connection*/ public static MongoDatabase setConnection() { try { // connection MongoDB service @SuppressWarnings("resource") MongoClient mongoClient=new MongoClient("localhost",27017); // connect to the database MongoDatabase mongoDatabase=mongoClient.getDatabase("test"); System.out.println("successfully connecting"+mongoClient); return mongoDatabase; } catch (Exception e) { // TODO: handle exception e.printStackTrace (); } return null; } / * Default collection * / public static String userinfoCollection() { return "info"; } @SuppressWarnings({ }) / * Find JSON * / public static boolean checkinfo(String user,String password) { boolean result=false; if(setConnection()!=null) { MongoDatabase mongoDatabase=setConnection(); MongoCollection<Document> collection=mongoDatabase.getCollection(userinfoCollection()); // "userid", "userpassword" is the field name in my info collection Bson filter=Filters.eq("userid",user); FindIterable <Document> = findIterable collection.find (filter); MongoCursor <Document> = findIterable.iterator runner (); while(cursor.hasNext()) { Bson refilter=Filters.eq("userpasswd",password); FindIterable<Document> refindIterable=collection.find(refilter); MongoCursor<Document> recursor=refindIterable.iterator(); while(recursor.hasNext()) { System.out.println(recursor.next()); result=true; return true; } } }else { // connection failed MongeDB System.out.println("Connection failure"); return false; } return result; } / * Insert JSON * / public static boolean insertinfo(String user,String password) { if(setConnection()!=null) { MongoDatabase mongoDatabase=setConnection(); // System.out.println(mongoDatabase); MongoCollection<Document> collection=mongoDatabase.getCollection(userinfoCollection()); // System.out.println(userinfoCollection()); Document document=new Document("userid",user).append("userpasswd", password); collection.insertOne(document); return true; }else { // connection failed MongeDB System.out.println("Connection failure"); return false; } } / * Update JSON * / public static boolean updateinfo(String user,String newpasswd) { if(setConnection()!=null) { MongoDatabase mongoDatabase=setConnection(); MongoCollection<Document> collection=mongoDatabase.getCollection(userinfoCollection()); Bson filter=Filters.eq("userid",user); Document document=new Document("$set",new Document("userpasswd",newpasswd)); collection.updateOne(filter, document); return true; }else { // connection failed MongeDB System.out.println("Connection failure"); return false; } } // simple test public static void main(String[] args) { setConnection(); boolean rs1=checkinfo("admin", "passwd1"); System.out.print(rs1); boolean rs2=insertinfo("newadmin", "newpasswd"); System.out.print(rs2); boolean rs3=updateinfo("admin", "passwd"); System.out.print(rs3); } }
With this simple operation mongodb I of the package, to facilitate subsequent requests authentication servlet. 2020 is about to come, I wish you all a Happy New Year and good luck!