JAVA下载MongoDB的文件

import com.mongodb.MongoClient;
import com.mongodb.MongoClientOptions;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;
import org.bson.types.Binary;
import org.bson.types.ObjectId;
import org.springframework.util.FileCopyUtils;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @author leo
 * @date 2021/12/27 15:01
 */
public class LeoFileDownTest {

    private static String host = "localhost";
    private static Integer port = 47117;
    private static String userName = "admin";
    private static String database = "TFS";
    private static String databaseName = "TFS";
    private static String password = "root123456";
    private static String md5 = "aec6143b2c358a64497e89bfaa285b02";

    public static void main(String[] args) throws IOException {

        ServerAddress serverAddress = new ServerAddress(host , port);
        List<ServerAddress> addrs = new ArrayList<>();
        addrs.add(serverAddress);
        MongoCredential credential = MongoCredential.createCredential(userName, database, password.toCharArray());
        MongoClientOptions.Builder builder = MongoClientOptions.builder();
        MongoClientOptions clientOptions = builder.build();
        MongoClient mongoClient = new MongoClient(addrs, credential, clientOptions);
        MongoDatabase tfs = mongoClient.getDatabase(databaseName);
        MongoCollection<Document> collection = tfs.getCollection("fs.files");
        Document query = new Document("md5", md5);
        FindIterable<Document> documents = collection.find(query);
        for (Document document : documents) {
            ObjectId id = document.getObjectId("_id");
//            System.out.println(id);
            collection = tfs.getCollection("fs.chunks");
            query = new Document("files_id", id);
            documents = collection.find(query);
            for (Document document2 : documents) {
                ObjectId id2 = document2.getObjectId("_id");
                Binary data2 = (Binary) document2.get("data");
                byte[] data1 = data2.getData();
                FileCopyUtils.copy(data1, new File("C:\\Users\\Dell\\Desktop\\" + id2 + ".csv"));
                System.out.println(id2);
            }
        }


    }

}