网上搜了一圈，官方并有提供批量导出所有集合到json文件的方法。有不少脚本可以实现，但是我还是习惯用java，如下

package starcLL.webClient;import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;import net.sf.json.JSONArray;
import net.sf.json.JSONObject;import org.bson.Document;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.mongodb.BasicDBObject;
import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.MongoException;
import com.mongodb.ServerAddress;
import com.mongodb.client.ListIndexesIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;@Component
public class MongodbClient {private static String starcLL_mongodb_ip="填写你的ip";private static int starcLL_mongodb_port=填写你的端口;private static String starcLL_mongodb_name="填写你的数据库名"; public static MongoClient mongoClient = null;public static MongoDatabase database = null;public static ServerAddress serverAddress = null;public static MongoCredential credentials = null;public static List<ServerAddress> addressLists = new ArrayList<ServerAddress>();public static List<MongoCredential> credentialsLists = new ArrayList<MongoCredential>();public static MongoClient getMongoClient() {if (null == mongoClient) {try {serverAddress = new ServerAddress(starcLL_mongodb_ip, starcLL_mongodb_port);addressLists.add(serverAddress);credentials = MongoCredential.createCredential("数据库", "用户名","密码".toCharArray());credentialsLists.add(credentials);return new MongoClient(addressLists,credentialsLists);} catch (MongoException e) {System.out.println(e.toString());}}return mongoClient;}public static void main(String[] args) throws IOException {MongoClient mongoClient=getMongoClient();Set<String> collectionNames=mongoClient.getDB(starcLL_mongodb_name).getCollectionNames();MongoDatabase mongoDatabase=mongoClient.getDatabase(starcLL_mongodb_name);System.out.println("开始...");int i=collectionNames.size();for (String cName:collectionNames) {JSONArray jsonArray=new JSONArray();System.out.println("获取集合："+cName);MongoCursor<Document> cursor = mongoDatabase.getCollection(cName).find().iterator();try {while (cursor.hasNext()) {jsonArray.add(cursor.next().toJson());}} finally {cursor.close();}File txt=new File("C:/Users/Administrator/Desktop/svc/"+i+".json");if(!txt.exists()){txt.createNewFile();}byte bytes[]=new byte[512];bytes=jsonArray.toString().getBytes();    int b=jsonArray.toString().length();    FileOutputStream fos=new FileOutputStream(txt);fos.write(bytes,0,b);fos.close();i--;}}
}