每日日报2021.10.18

完成内容：

1.mango数据库的API操作

import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;
import com.mongodb.client.*;
import org.bson.Document;
import java.util.ArrayList;
import java.util.List;

public class MongoDBConnection {

    //通过用户密码认证链接数据库
    public MongoClient getConnByCredit(){

        String name = "root";//用户名
        String dbName = "admin";//数据库名
        char [] pwd = "root".toCharArray();//用户密码(将字符串转换成字符数组)

        List<ServerAddress> addresses = new ArrayList<>();
        //服务器地址：链接地址,端口号
        ServerAddress address = new ServerAddress("centos01",27017);
        addresses.add(address);

        List<MongoCredential> credentials = new ArrayList<>();
        //认证方法需要三个参数，用户名，数据库名，用户密码
        MongoCredential credential = MongoCredential.createScramSha1Credential(name,dbName,pwd);
        credentials.add(credential);

        //创建链接对象
        MongoClient mongoClient = new MongoClient(addresses,credentials);
        return mongoClient;

    }

    //测试是否连接成功
    public static void main(String[] args) {
        MongoDBConnection mongoDBConnection = new MongoDBConnection();
        MongoDatabase mongoDatabase = null;
        MongoClient mongoClient = mongoDBConnection.getConnByCredit();

        //查询所有数据库名称
        MongoIterable<String> dbNameList = mongoClient.listDatabaseNames();
        System.out.println("查询所有数据库名称:");
        for(String dbName : dbNameList)
            System.out.println(dbName);

        //创建数据库对象
        mongoDatabase = mongoClient.getDatabase("admin");
        //查询Test数据库中所有集合名称
        MongoIterable<String> colNameList = mongoDatabase.listCollectionNames();
        System.out.println("查询admin数据库中所有集合名称:");
        for(String colName: colNameList)
            System.out.println(colName);

        //关闭连接
        mongoClient.close();
    }
}
 

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