java对mongodb数据库的简单操作
准备工作:
下载好mongodriver.jar包(https://oss.sonatype.org/content/repositories/releases/org/mongodb/mongodb-driver/3.6.1/)
代码实现:
try {
// 实例化Mongo对象,连接27017端口
Mongo mongo = new Mongo("localhost", 27017);
// 连接名为yourdb的数据库,假如数据库不存在的话,mongodb会自动建立
DB db = mongo.getDB("test");
// Get collection from MongoDB, database named "yourDB"
// 从Mongodb中获得名为yourColleection的数据集合,如果该数据集合不存在,Mongodb会为其新建立
DBCollection collection = db.getCollection("test1");
// 使用BasicDBObject对象创建一个mongodb的document,并给予赋值。
BasicDBObject document = new BasicDBObject();
//document.put("id", 1001);
//document.put("msg", "hello world mongoDB in Java");
// 将新建立的document保存到collection中去
//collection.insert(document);
// 创建要查询的document
BasicDBObject searchQuery = new BasicDBObject();
searchQuery.put("name", "chen");
// 使用collection的find方法查找document
DBCursor cursor =collection.find(searchQuery);
// 循环输出结果
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
System.out.println("Hello World");
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (MongoException e) {
e.printStackTrace();
}
可能会遇到的报错信息:
Note: mongodb-driver requires the following dependencies: bson and mongodb-driver-core
解决:
Note: mongodb-driver requires the following dependencies: bson and mongodb-driver-core
去看一下 ,然后对应的地方有两个包的下载,导进你的方法就ok了
mongodb-driver-3.0.1.jar
mongodb-driver-core-3.0.1.jar
bson-3.0.1.jar
https://oss.sonatype.org/content/repositories/releases/org/mongodb/mongodb-driver/3.0.1/
https://oss.sonatype.org/content/repositories/releases/org/mongodb/mongodb-driver-core/3.0.1/
https://oss.sonatype.org/content/repositories/releases/org/mongodb/bson/3.0.1/