package com.joey.mongo;import java.util.Map;/** * @author joey 2013-09-02 * @e-mail joey.wen@outlook.com */public abstract class MongoDBClient { public abstract void insert(Map<String, String> map); public abstract String getValueByKey(String uid, String key); public abstract String getValueByKey(Map<String, String> map, String key); public abstract String get(String uid); public abstract void update(String uid, String key, String value); public abstract void update(String uid, String key, String src, String dest); public abstract void update(String uid, Map<String, String> map); public abstract void setDB(String dbName); public abstract void setCollection(String collName); public abstract void close(); public abstract void connect(); public class MongoDBException extends Exception { public MongoDBException(Exception e) { super(e); } }}package com.joey.mongo;import java.net.UnknownHostException;import java.util.Map;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.MongoException;/** * SimpleMongoDBClient * @author Joey * @e-mail joey.wen@outlook.com */public class SimpleMongoDBClient extends MongoDBClient { String host = null; int port = 0; String dbName = null; Mongo mongo = null; DB db = null; DBCursor cursor = null; DBCollection collection = null; String collectionName = null; final static String DEFAULT_UIDNAME = "default"; public SimpleMongoDBClient(String host, int port, String dbName, String collectionName) { this.host =host; this.port = port; this.dbName = dbName; this.collectionName = collectionName; } @Override public void connect() { try{ mongo = new Mongo(host, port); if (mongo == null) throw new NullPointerException("access mongoDB " + host + ":" + port + " error"); db = mongo.getDB(dbName); if (db == null) throw new NullPointerException("get db " + dbName + " error"); collection = db.getCollection(collectionName); if( collection == null ) throw new NullPointerException("get collection " + dbName + " error"); } catch (UnknownHostException e) { System.err.println(e.getMessage()); return; } catch (MongoException e) { System.err.println(e.getMessage()); return; } } @Override public void setDB(String collName) { dbName = collName; if (mongo != null) { db = mongo.getDB(dbName); } else { throw new RuntimeException("access mongoDB " + host + ":" + port + " error"); } } @Override public void setCollection(String collName) { // TODO Auto-generated method stub collectionName = collName; collection = db.getCollection(collectionName); if (collection == null) { throw new NullPointerException("get collection " + collectionName + " error"); } } @Override public void close() { if (mongo != null) mongo.close(); } /** * get the whole json string by uid * @param uid */ @Override public String get(String uid) { BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put(DEFAULT_UIDNAME, uid); cursor = collection.find(searchQuery); if (cursor.count() > 1) { throw new RuntimeException("More than one result from find method with uid " + uid); } String ret = null; while (cursor.hasNext()) { ret = cursor.next().toString(); // json string break; } cursor.close(); return ret; } /** * get the value of the key * @param uid */ @Override public String getValueByKey(String uid, String key) { BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put(DEFAULT_UIDNAME, uid); cursor = collection.find(searchQuery); if (cursor.count() > 1) { throw new RuntimeException("More than one result from find method with uid " + uid); } return get(cursor, key); } @Override public String getValueByKey(Map<String, String> queryMap, String key) { BasicDBObject searchQuery = new BasicDBObject(queryMap); cursor = collection.find(searchQuery); if (cursor.count() > 1) { throw new RuntimeException("More than one result from find" + " method with query fields " + queryMap.toString()); } return get(cursor, key); } private String get(DBCursor cur, String key) { String ret = null; while (cur !=null && cur.hasNext()) { DBObject obj = cur.next(); if (obj != null) ret = (String) obj.get(key); break; } cur.close(); return ret; } /** * @param uid */ @Override public void update(String uid, String key, String value) { BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put(DEFAULT_UIDNAME, uid); cursor = collection.find(searchQuery); while (cursor.hasNext()) { cursor.next(); BasicDBObject set = new BasicDBObject("$set", new BasicDBObject(key, value)); collection.update(cursor.curr(), set); break; } cursor.close(); } /** * find the value of the key, if the value equals src, set it to dest * * @param uid * */ @Override public void update(String uid, String key, String src, String dest) { BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put(DEFAULT_UIDNAME, uid); cursor = collection.find(searchQuery); while (cursor.hasNext()) { if (cursor.next().get(key).equals(src)){ BasicDBObject set = new BasicDBObject("$set", new BasicDBObject(key, dest)); collection.update(cursor.curr(), set); break; } } cursor.close(); } @Override public void update(String uid, Map<String, String> mm) { BasicDBObject searchQuery = new BasicDBObject(); searchQuery.put(DEFAULT_UIDNAME, uid); cursor = collection.find(searchQuery); while (cursor.hasNext()) { cursor.next(); BasicDBObject set = new BasicDBObject("$set", new BasicDBObject(mm)); collection.update(cursor.curr(), set); break; } cursor.close(); } @Override public void insert(Map<String, String> map) { collection.insert(new BasicDBObject(map)); }}
自己在公司写的简单客户端程序，欢迎大家吐槽修改。
