JAVA下mongo调用

项目中要用到mongo，简单学习了一下，还是挺简单的。

首先下载mongoBD JAR包 https://github.com/mongodb/mongo-java-driver/downloads

调用接口：

import java.util.ArrayList;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.util.JSON;public class MongoOperator {private  String host;private  String db_name;private  String collection_name;private Mongo mongo;private DB db;public DBCollection coll;public MongoOperator(String host, String db, String collection){this.host = host;this.db_name = db;this.collection_name = collection;mongo = null;db = null;coll = null;}public boolean connect() {try {mongo = new Mongo(host, 27017);db = mongo.getDB(db_name);return true;} catch (Exception e) {e.printStackTrace();}return false;}public DBCollection getDBCollection(){coll = null;try {coll = db.getCollection(collection_name);}catch (Exception e) {e.printStackTrace();}return coll;}public String getOneRecord(){if(coll != null){BasicDBObject obj = (BasicDBObject) coll.findOne();return obj.toString();}return "null";}public boolean insertRecord(String record){if(coll != null){DBObject dbObject = (DBObject)JSON.parse(record);coll.insert(new DBObject[]{dbObject});return true;}return false;}public boolean insertRecord(DBObject record){if(coll != null){coll.insert(new DBObject[]{record});return true;}else{System.out.println("coll is null");return false;}}public boolean updateRecord(DBObject record){if(coll != null){coll.insert(new DBObject[]{record});return true;}else{System.out.println("coll is null");return false;}}public ArrayList<DBObject> queryRecord(String field, String value){ArrayList<DBObject> list = new ArrayList<DBObject>();if(coll != null){DBObject searchQuery = new BasicDBObject();            searchQuery.put(field, value);            DBCursor cursor = coll.find(searchQuery);            while(cursor.hasNext()) {            list.add(cursor.next());            }return list;}return null;}public int deleteRecord(String field, String value){int num = 0;ArrayList<DBObject> list = queryRecord(field, value);for(DBObject obj:list){coll.remove(obj);num++;}return num;}}

一个简单的例子，mongo数据库在远程服务器上，返回的是类似于JSON格式的数据流：

import java.net.UnknownHostException;import java.util.ArrayList;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.MongoException;import com.mongodb.util.JSON; public class SimpleTest { private static String host = "10.13.80.145";private static String db_name = "historyNews";//historyNews";webNews;oid2nidprivate static String collection_name = "News";//"News";PageInfo;mappublic static void main(String[] args) throws Exception {MongoOperator mongo = new MongoOperator(host, db_name, collection_name);if(mongo.connect()){mongo.getDBCollection();}ArrayList<DBObject> list = mongo.queryRecord("_id","12508293");for(DBObject obj:list){//System.out.println(obj);System.out.println(obj.get("content"));}}}

完整代码：

package mongo;import java.util.ArrayList;import java.util.Date;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 Test {private static String host = "10.13.80.145";private static String db_name = "historyNews";//historyNews";webNews;oid2nidprivate static String collection_name = "News";//"News";PageInfo;mappublic static void main(String[] args) throws Exception {MongoOperator mongo = new MongoOperator(host, db_name, collection_name);if(mongo.connect()){mongo.getDBCollection();//System.out.println(mongo.getOneRecord());}//String record = "{\"_id\":\"oid\",\"nid\":\"nid\"}";//System.out.println(record);//mongo.insertRecord(record);ArrayList<DBObject> list = mongo.queryRecord("_id","12508293");for(DBObject obj:list){System.out.println(obj);//System.out.println(obj.get("co"));}//mongo.deleteRecord("_id","12861760");//Test mt = new Test();// mt.insertMemo();//mt.getMemo();// mt.query();// mt.delete();}public static DBCollection getDBCollection(String collectionName)throws Exception {Mongo m = new Mongo(host, 27017);DB db = m.getDB(db_name);System.out.println(db.getName());if (db.authenticate("spell", "007".toCharArray())) {System.out.println("auth success");}DBCollection coll = db.getCollection(collectionName);if(db.isAuthenticated()){System.out.println("isAuthenticated success");}return coll;}public void insertMemo() throws Exception {DBCollection coll = Test.getDBCollection("memo");DBObject doc = new BasicDBObject();doc.put("title", "one meeting");doc.put("palce", "one meeting");doc.put("time", new Date());coll.insert(new DBObject[]{doc});}public void getMemo() throws Exception {DBCollection coll = Test.getDBCollection(collection_name);BasicDBObject obj = (BasicDBObject) coll.findOne();System.out.println(obj);}public void query() throws Exception {DBCollection coll = Test.getDBCollection("memo");BasicDBObject obj = new BasicDBObject();obj.put("title", "one meeting");DBCursor cursor = coll.find(obj);while (cursor.hasNext()) {Date date = (Date) cursor.next().get("time");System.out.println(date.toLocaleString());}cursor.close();}public void delete() throws Exception {DBCollection coll = Test.getDBCollection("memo");BasicDBObject query = new BasicDBObject();query.put("title", "one meeting");// 找到并且删除，并返回删除的对象DBObject removeObj = coll.findAndRemove(query);System.out.println(removeObj);}}