首先新建一個java project項目，去下載mongo-java-driver-3.2.2.jar包。build path導入junit需要的jar包。另外運行代碼前先要啟動mongod 服務。下面就是簡單的CRUD代碼：

package com.mongodb;

import junit.framework.TestResult;

import org.bson.Document;

import org.bson.conversions.Bson;

import org.junit.After;

import org.junit.Before;

import org.junit.Test;

import com.mongodb.client.MongoCollection;

import com.mongodb.client.MongoCursor;

import com.mongodb.client.MongoDatabase;

public class MongoDBTest {

private MongoDatabase db=null;

private MongoClient mongoClient=null;

@Before

public void init(){

mongoClient=new MongoClient("127.0.0.1:27017");

db=mongoClient.getDatabase("test");

}

@Test

public void testQuery() {

MongoCollection collec=db.getCollection("people");

System.out.println(collec);

MongoCursor cursor=collec.find().iterator();

while(cursor.hasNext()){

Document obj=(Document)cursor.next();

System.out.println(obj.get("name")+","+obj.get("age"));

}

}

@Test

public void testAdd(){

MongoCollection peoples=db.getCollection("people");

Document doc=new Document();

doc.put("name", "xiaoming");

doc.put("age", 23);

peoples.insertOne(doc);

}

@Test

public void remove(){

MongoCollection peoples=db.getCollection("people");

Document doc=new Document();

doc.put("name", "xiaoming");

peoples.deleteMany(doc);

}

@Test

public void update(){

MongoCollection peoples=db.getCollection("people");

Document bson=new Document();

bson.put("name", "xiaoming");

Document bson1=new Document();

bson1.put("name", "xiaoming");

bson1.put("age", "26");

UpdateResult result=peoples.replaceOne(bson, bson1);//用updateOne會報錯

System.out.println("修改行數:"+result.getModifiedCount());

}

@After

public void tesRelease(){

if(mongoClient!=null){

mongoClient.close();

}

}

}

總結

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