java连接mongoDB《安全验证》

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1. 需要jar包：

maven依赖：

<dependency><groupId>org.mongodb</groupId><artifactId>mongo-java-driver</artifactId><version>2.12.4</version></dependency>

2.设置db数据库的安全验证机制：

①创建用户

②在开启mongoDB的时候使用安全模式：

3.java代码，实现CRUD。

package mongoDb;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.MongoClient;import com.mongodb.MongoCredential;import com.mongodb.ServerAddress;public class MongoDBUtil {    static MongoClient client;    static DB db;    static DBCollection collection;    static {        try {            // client = new MongoClient("192.168.20.114", 27017);            System.out.println("连接服务器测试.................");            ServerAddress serverAddress = new ServerAddress("192.168.20.114", 27017);            List<ServerAddress> seeds = new ArrayList<ServerAddress>();            seeds.add(serverAddress);            MongoCredential credentials = MongoCredential.createMongoCRCredential("testAdmin", "test",                    "123".toCharArray());            List<MongoCredential> credentialsList = new ArrayList<MongoCredential>();            credentialsList.add(credentials);            client = new MongoClient(seeds, credentialsList);            // (List<ServerAddress> seeds, List<MongoCredential//            db = client.getDB("test");            // db.authenticate("testAdmin", "123".toCharArray());            collection = db.getCollection("user");        } catch (UnknownHostException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public static void add(DBObject dbObject) {        collection.insert(dbObject);    }    public static void del(DBObject dbObject) {        collection.remove(dbObject);    }    public static void update(DBObject dbObject1, DBObject dbObject2) {        collection.update(dbObject1, dbObject2);    }    public static DBObject queryOneByKey(DBObject dbObject, DBObject keys) {        DBCursor dbCursor = collection.find(dbObject, keys);        if (dbCursor.hasNext()) {            return dbCursor.next();        }        return null;    }    public static java.util.List<DBObject> query(DBObject dbObject) {        DBCursor dbCursor = collection.find(dbObject);        List<DBObject> ret = new ArrayList<DBObject>();        while (dbCursor.hasNext()) {            DBObject dbObject2 = dbCursor.next();            ret.add(dbObject2);        }        return ret;    }            public static void main(String[] args) {        BasicDBObject dbObject = new BasicDBObject();        dbObject.put("num", new BasicDBObject("$gt", 0));        List<DBObject> ret = MongoDBUtil.query(dbObject);        for (Iterator<DBObject> it = ret.iterator(); it.hasNext();) {            System.out.println(it.next());        }    }}

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