Add, delete, modify and check in mongoDB using java

需要mongodb的驱动jar（mongo-java-driver-3.2.0.jar）
package mongodb;

import java.net.UnknownHostException; 
import java.util.Date; 
import com.mongodb.BasicDBObject; 
import com.mongodb.DB; 
import com.mongodb.DBCollection; 
import com.mongodb.DBCursor; 
import com.mongodb.Mongo; 
import com.mongodb.MongoException;
import com.mongodb.util.JSON;

public class mongoDB_zsgc {
@SuppressWarnings("deprecation")
public static void main(String[] args) throws UnknownHostException { 
 
        try { 
 
            /**** 连接数据库 ****/ 
            Mongo mongo = new Mongo("127.0.0.1",27017); 
             
           
            /****获取数据库 ****/ 
            // if database doesn't exists, MongoDB will create it for you 
            DB db = mongo.getDB("userMessageDB"); 

            /****获取数据集合 ****/ 
            // if collection doesn't exists, MongoDB will create it for you 
            DBCollection table = db.getCollection("userList"); 
 
            /**** 添加数据(10条) ****/  
//            BasicDBObject document =null;
//            for(int i =1;i<=10;i++){
//              document = new BasicDBObject();
//              document.put("name", "student"+i); 
//                  document.put("age", 18); 
//                  document.put("createdDate", new Date());
//                  table.insert(document);
//            }
            
 
            /****单条查找数据1****/ 
//            BasicDBObject searchQuery = new BasicDBObject(); 
//            searchQuery.put("name", "student1"); 
//            DBCursor cursor = table.find(searchQuery); 
//            while (cursor.hasNext()) { 
//                System.out.println(cursor.next()); 
//            }
            /****单条查找数据2 ****/ 
//            BasicDBObject searchQuery3 = new BasicDBObject().append("name", "student1"); 
//            DBCursor cursor3 = table.find(searchQuery3); 
//            while (cursor3.hasNext()) { 
//                System.out.println(cursor3.next()); 
//            } 
      
            //Query all databases
// for (String db1 : mongo.getDatabaseNames()) { 
// System.out.println(db1); 
// } 
// //Query all aggregated collections 
// for (String name : db.getCollectionNames()) { 
// System.out.println(name); 
// } 
           
           
           
         
 
            /****Modify data****/ 
// BasicDBObject query4 = new BasicDBObject(); 
// query4.put(" name", "student10"); 
// 
// BasicDBObject newDocument = new BasicDBObject(); 
// newDocument.put("name", "kaige"); 
// 
// BasicDBObject updateObj = new BasicDBObject(); 
//            updateObj.put("$set", newDocument); 
//            table.update(query4, updateObj); 
//           
            //删除数据
            deleteColData(table, "student1");
            //查询所有数据 
            DBCursor cursor = table.find(); 
            while (cursor.hasNext()) { 
                System.out.println(cursor.next()); 
            } 
            System.out.println(cursor.count()); 
            System.out.println(cursor.getCursorId()); 
            System.out.println(JSON.serialize(cursor));
           
           
          

 
        } catch (MongoException e) { 
            e.printStackTrace(); 
        } 
 
    } 

/**
     * 数据删除
     */ 
    private static void deleteColData(DBCollection table,String name){
    BasicDBObject query = new BasicDBObject(); 
    query.put("name", name);
    table.remove(query);
    } 
}