57个挑战(python+java)-lesson51（70个python练手项目）

python版本：

不想写了，参考之前老文章：

https://www.toutiao.com/article/7084441585076683278

java版本：

这里我直接建设了一个本地的mongodb，然后用mongodb 实现类似firebase 的功能：

1. 本地创建一个Mongodb：

大概步骤：

1-1 从docker hub里面下载一个。并启动起来,本地端口做个映射（27017）：

docker run --name mongolocalv2 -p 27017:27017 -d mongo:latest

1-2 写脚本，连接到Mongodb，并做插入和查询操作：

import ch.qos.logback.classic.Logger;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import org.bson.*;
import com.mongodb.*;
import com.mongodb.client.*;


import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
import java.util.regex.Pattern;

// 按照这篇文章来实现的关闭 IDEA 控制台上的mongoclient 的 debug 日志
// https://stackoverflow.com/questions/30137564/how-to-disable-mongodb-java-driver-logging
public class PushingNotesv3 {


    Scanner sc = new Scanner(System.in);
    String note ;
    int controlsiginal=0;
    String mongoUri = "mongodb://127.0.0.1:27017";
    MongoClientURI connStr = new MongoClientURI(mongoUri);
    MongoClient mongoClient = new MongoClient(connStr);

    void controllogic()
    {
        this.Get_input();
        if(this.controlsiginal == 1)
        {
            this.insert_mongo();
        }
        else if (this.controlsiginal == 2)
        {
            this.display_mongo();
        }
        else{
            //do nothing
        }



    }


    void insert_mongo()
    {
        try {
            // 使用名为 someonedb 的数据库
            MongoDatabase database = mongoClient.getDatabase("57challenge");
            // 取得集合/表 someonetable 句柄
            MongoCollection<Document> collection = database.getCollection("note");

            // 1.准备时间
            SimpleDateFormat sdf = new SimpleDateFormat();// 格式化时间
            sdf.applyPattern("yyyy-MM-dd");// a为am/pm的标记
            Date date = new Date();
            String time = sdf.format(date);

            //2.插入时间和内容
            Document doc = new Document();
            doc.append("time", time);
            doc.append("note", this.note);

            // 3. 写入数据
            collection.insertOne(doc);
            //System.out.println("insert document: " + doc);


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

    void display_mongo() {
        try {
            // 使用名为 someonedb 的数据库
            MongoDatabase database = mongoClient.getDatabase("57challenge");
            // 取得集合/表 someonetable 句柄
            MongoCollection<Document> collection = database.getCollection("note");

            MongoCursor<Document> cursor = collection.find().iterator();

            while (cursor.hasNext()) {
                //System.out.println(cursor.next());
                Document a = cursor.next();
                System.out.println(a.get("time") + "--" + a.get("note"));
            }


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

    void Get_input(){
        System.out.println("请输入数据，以这个模式输入： mynotes new 日记 或者 mynotes show ");
        String content = sc.nextLine();
        String pattern = "^mynotes new.*";
        String pattern2 = "^mynotes show.*";
        if(Pattern.matches(pattern,content)) {
            // 1写入逻辑
           // System.out.println("这是插入逻辑");
            this.note = content.replaceFirst("mynotes new","");
            //System.out.println(this.note);
            this.controlsiginal = 1;

        }

        else if(Pattern.matches(pattern2,content))
        {
            //2.查询逻辑
            System.out.println("这是查询逻辑");
            this.controlsiginal = 2;

        }
        else{
            System.out.println("输入有错误，请重新输入\n 输入： mynotes new 日记 或者 mynotes show ");
        }


    }



    public static void main(String[] args) {
       // ((LoggerContext) LoggerFactory.getILoggerFactory()).getLogger("org.mongodb.driver").setLevel(Level.ERROR);
        LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
        Logger rootlogger = loggerContext.getLogger("org.mongodb.driver");
        rootlogger.setLevel(Level.ERROR);

        while(true){
        PushingNotesv3 lesson50 = new PushingNotesv3();

        //lesson50.connect_mongo();
       // lesson50.insert_db();
        lesson50.controllogic();
        }


    }
}

IDEA POM清单

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongodb-driver</artifactId>
        <version>3.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongo-java-driver</artifactId>
        <version>3.2.2</version>
    </dependency>
    <dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-core</artifactId>
    <version>3.2.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.logging.log4j</groupId>
        <artifactId>log4j-api</artifactId>
        <version>2.9.0</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
</dependencies>

这里发现用了mongodbclient 后，控制台太多debug信息了，网上搜了好久，实现了在IDEA 控制台，把Debug 模式关闭的功能，要参考这篇文章：

https://stackoverflow.com/questions/30137564/how-to-disable-mongodb-java-driver-logging

执行效果图：