简单学习Java+MongoDB

package com.wx.test;
import java.util.ArrayList;
import java.util.List;
import org.bson.Document;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
/**
 * 测试mongodb 测试点：增加，查询，更新，删除
 * 
 * @author wangxu
 * @date 2016-3-27
 */
public class TestMongoDB {
 public static void main(String[] args) {
 // 建立连接,MongoDB默认是没有用户名及密码
 MongoClient mongoClient = new MongoClient("localhost", 27017);
 // 获取test库
 MongoDatabase db = mongoClient.getDatabase("test");
 // 创建集合
 db.createCollection("user");
 // 获取集合
 MongoCollection collection = db.getCollection("user");
 // 插入文档（支持多条）
 Document document = new Document("name", "wangxu").append("age", "27");
 Document document2 = new Document("name", "wangxu_java").append("age",
  "27");
 List<Document> documents = new ArrayList<>();
 documents.add(document);
 documents.add(document2);
 collection.insertMany(documents);
 // 更新wangxu的age为30
 collection.updateMany(Filters.eq("name", "wangxu"), new Document(
  "$set", new Document("age", 30)));
 // 查询文档
 FindIterable<Document> findIterable = collection.find();
 MongoCursor<Document> mongoCursor = findIterable.iterator();
 // 遍历游标
 while (mongoCursor.hasNext()) {
  Document doc = mongoCursor.next();
  System.out.println("name=" + doc.get("name"));
 }
 // 删除wangxu_java
 collection.deleteMany(Filters.eq("name", "wangxu_java"));
 }
}

MongoClient mongoClient = new MongoClient("域不存在", 27017); //建立连接