mongodb工具类

这里是笔者自己写的mongodb单例工具类,仅供参考,已在开发中正常使用可留言提出建议,一起探讨package com.fusionskye.ezsonar.rpo.util;import java.io.IOException;import java.io.InputStream;import java.lang.reflect.Field;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.List;import java.util.Properties;import com.fusionskye.ezsonar.tools.utils.LoadProperties;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.MongoClient;import com.mongodb.MongoCredential;import com.mongodb.ServerAddress;public class MongoUtils {private static DB db = null;private static String host;private static Integer port;private static String name;private static String username;private static String password;private MongoUtils() {}static {InputStream is = null;try {String path = LoadProperties.getPath();PropertiesUtil props = new PropertiesUtil(path, "mongo");host = props.getProperty("mongodb.auth.host");port = Integer.parseInt(props.getProperty("mongodb.auth.port"));name = props.getProperty("mongodb.auth.name");username = props.getProperty("mongodb.auth.username");password = props.getProperty("mongodb.auth.password");} catch (Exception e) {e.printStackTrace();throw new RuntimeException("加载db.properties文件失败");} finally {if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();} finally {is = null;}}}}/*** 连接数据库** @return*/public static synchronized DB getConnection() {if (db == null) {MongoClient mongoClient = null;try {//IP地址 和 端口ServerAddress serverAddress = new ServerAddress(host, port);List<ServerAddress> addrs = new ArrayList<ServerAddress>();addrs.add(serverAddress);MongoCredential credential = MongoCredential.createCredential(username, name, password.toCharArray());List<MongoCredential> credentials = new ArrayList<MongoCredential>();credentials.add(credential);// 通过连接认证获取MongoDB连接mongoClient = new MongoClient(addrs, credentials);// 连接到数据库db = mongoClient.getDB(name);System.out.println(host + "--" + port + "--" + name + "--" + username + "--" + password);System.out.println("Connect to database successfully");} catch (Exception e) {System.err.println(e.getClass().getName() + ": " + e.getMessage());}}return db;}// 获取集合连接public static DBCollection getCollection(String collectionName) {return getConnection().getCollection(collectionName);}/*** 将实体类所有属性值添加到BasicDBObject中** @param model* @param bdo* @return*/public static BasicDBObject putIntoDBObject(SuperPersistentObject model) {BasicDBObject bdo = new BasicDBObject();try {if (model != null) {Field[] fields = model.getClass().getDeclaredFields();for (Field field : fields) {// id交由mongodb自动生成if (!"objId".equals(field.getName())) {field.setAccessible(true);String classType = field.getType().toString();int lastIndex = classType.lastIndexOf(".");classType = classType.substring(lastIndex + 1);if (field.get(model) != null) {bdo.put(field.getName(), field.get(model));}}}}} catch (Exception e) {e.printStackTrace();}return bdo;}/*** 将实体类所有属性值添加到BasicDBObject中,使用原来的BasicDBObject** @param model* @param bdo* @return*/public static BasicDBObject putIntoDBObjectEdit(SuperPersistentObject model, BasicDBObject bdo) {try {if (model != null) {Field[] fields = model.getClass().getDeclaredFields();for (Field field : fields) {// id交由mongodb自动生成if (!"objId".equals(field.getName())) {field.setAccessible(true);String classType = field.getType().toString();int lastIndex = classType.lastIndexOf(".");classType = classType.substring(lastIndex + 1);if (field.get(model) != null) {bdo.put(field.getName(), field.get(model));} else {bdo.put(field.getName(), "");}}}}} catch (Exception e) {e.printStackTrace();}return bdo;}}