mongodb和java的简单链接

先导入mongo的jar包.MongoDB.java

package com.util;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;import org.bson.types.ObjectId;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;/** * @author nidayu * @date 2015-1-4 * @Description xxx * @version V1.0 */public class MongoDB {static Mongo connection;static DB db;public MongoDB(String databaseName) throws UnknownHostException {connection = new Mongo("127.0.0.1:27017");db = connection.getDB(databaseName);}public static void main(String[] args) throws UnknownHostException {// 连接数据库MongoDB mongodb = new MongoDB("ndy");// 创建集合String collName = "javadb";mongodb.createCollection(collName);// 插入一条数据DBObject obj = new BasicDBObject();obj.put("name", "hello");obj.put("age", "5");obj.put("email", "[e-mail]");List<String> books = new ArrayList<String>();books.add("EXTJS");books.add("HBase");obj.put("books", books);mongodb.insert(obj, collName);// 批量插入数据List<DBObject> dbos = new ArrayList<DBObject>();DBObject dbo1 = new BasicDBObject("name", "aaa");DBObject dbo2 = new BasicDBObject("name", "bbb");dbos.add(dbo1);dbos.add(dbo2);mongodb.insertBatch(dbos, collName);// 根据ID删除数据int count = mongodb.deleteById("54a94f18bb8b785e749b5c2b", collName);System.out.println(count);// 根据条件进行删除DBObject aaa = new BasicDBObject("name", "aaa");mongodb.deleteByDbs(aaa, collName);// 更新操作DBObject update = new BasicDBObject();update.put("$set", new BasicDBObject("name", "aaa"));System.out.println(mongodb.update(new BasicDBObject(), update, false, true, collName));// 查询某些列DBObject keys = new BasicDBObject();keys.put("_id", false);keys.put("name", true);DBCursor cur = mongodb.find(null, keys, collName);while (cur.hasNext()) {DBObject dbo = cur.next();System.out.println(dbo.get("name"));}// 关闭连接connection.close();}// 创建一个集合public void createCollection(String collection) {DBObject dbs = new BasicDBObject();db.createCollection(collection, dbs);}// 插入一条数据public void insert(DBObject obj, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);dbcoll.insert(obj);}// 批量插入数据public void insertBatch(List<DBObject> dbses, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);dbcoll.insert(dbses);}// 删除数据public int deleteById(String id, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);int count = dbcoll.remove(new BasicDBObject("_id", new ObjectId(id))).getN();return count;}// 根据条件进行删除public int deleteByDbs(DBObject obj, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);int count = dbcoll.remove(obj).getN();return count;}// 更新数据private int update(BasicDBObject basicDBObject, DBObject update, boolean b, boolean c, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);int count = dbcoll.update(basicDBObject, update, b, c).getN();return count;}// 查询数据private DBCursor find(DBObject object, DBObject keys, String collectionName) {DBCollection dbcoll = db.getCollection(collectionName);DBCursor cur = dbcoll.find(object, keys);return cur;// 分页// return cur.limit(5).skip(0);}}