android外卖点餐界面（期末作业）

祈愿lucky2023-08-24 22:34

效果展示：



AndroidMainFest.xml

xml 复制代码 
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.EndActivity"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Register"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Login"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

FoodItem.java

java 复制代码 
package com.lzcu.endactivity;

public class FoodItem {
    private String name;        // 食品名称
    private double price;       // 食品价格
    private boolean isVegetarian;  // 是否素食

    public FoodItem(String name, double price) {
        this.name = name;
        this.price = price;

    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
}

Login.java

java 复制代码 
package com.lzcu.endactivity;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;


public class Login extends AppCompatActivity {

    Button login_but,register_but;
    TextView touchScreen;
    EditText Account_2,pwd;
    MyDatabaseHelper myDatabaseHelper;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //按钮组件
        login_but = findViewById(R.id.login);
        register_but = findViewById(R.id.register);
        //编辑框
        Account_2 = findViewById(R.id.UserName);
        pwd =findViewById(R.id.Pwd);
        //数据库
        myDatabaseHelper = new MyDatabaseHelper(this);
        myDatabaseHelper.getWritableDatabase();//只读
        //登录
        login_but.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                String acc = Account_2.getText().toString();
                String pwd1 =pwd.getText().toString();
                //获取数据库数据，判断用户名是否在库
                Cursor result = myDatabaseHelper.find();
                int a=0;
                int b=0;
                for (result.moveToFirst();!result.isAfterLast();result.moveToNext())
                {
                    @SuppressLint("Range") String account_1=result.getString(result.getColumnIndex("Account"));
                    @SuppressLint("Range") String pwd_1=result.getString(result.getColumnIndex("Password"));
                    if (Account_2.getText().toString().equals(account_1) && pwd.getText().toString().equals(pwd_1))
                        a=1;
                    if (Account_2.getText().toString().equals(account_1))
                        b=1;
                }
                if (b==1)
                {
                    if (!Account_2.getText().toString().equals("") && !pwd.getText().toString().equals(""))
                    {
                        if(a==1)
                        {
                            Intent intent = new Intent(Login.this, MainActivity.class);
                            startActivity(intent);
                            finish();
                            Toast.makeText(Login.this, "登入成功", Toast.LENGTH_SHORT).show();
                        }
                        else
                            Toast.makeText(getApplicationContext(),"密码错误！", Toast.LENGTH_SHORT).show();
                    }else
                        Toast.makeText(getApplicationContext(),"用户名或密码不能为空！", Toast.LENGTH_SHORT).show();
                }
                else
                    Toast.makeText(Login.this, "账号不存在，请注册！", Toast.LENGTH_SHORT).show();
                //关闭游标
                result.close();

            }
        });
        //注册
        register_but.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                //显示注册界面
                Intent intent = new Intent(Login.this, Register.class);
                //启动显示修改界面
                startActivity(intent);
                finish();
            }
        });
    }
}

MainActivity.java

java 复制代码 
package com.lzcu.endactivity;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    public TextView txtCartItems;
    public Button btnCheckout;
    public ArrayList<FoodItem> cartItems = new ArrayList<>();
    public double totalPrice = 0;
    private ListView menu_list;
    private List<String> mDataList;
    private ArrayAdapter<String> mAdapter;
    private EditText mEditText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        txtCartItems = findViewById(R.id.txt_cart_items);
        btnCheckout = findViewById(R.id.btn_checkout);

        //初始化
        // 初始化 ListView 和 数据源
        menu_list = findViewById(R.id.menu_list);
        mDataList = new ArrayList<>();

        // 添加测试数据
        mDataList.add("汉堡 22.5");
        mDataList.add("薯条 12.0");
        mDataList.add("热干面 8.0");
        mDataList.add("麻辣香锅 59.0");
        mDataList.add("鱼香肉丝 38.0");
        mDataList.add("大盘鸡 48.0");
        mDataList.add("炒粉丝 11.0");
        mDataList.add("毛血旺 58.0");

        // 创建适配器
        mAdapter = new ArrayAdapter<>(this,
                android.R.layout.simple_list_item_1, mDataList);

        // 设置适配器
        menu_list.setAdapter(mAdapter);

        // 设置列表项点击事件
        menu_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Toast.makeText(MainActivity.this, "你选择了" + mDataList.get(i),
                        Toast.LENGTH_SHORT).show();
                // 获取 editText 控件
                mEditText = findViewById(R.id.editText);

                mEditText.append(mDataList.get(i));
//                mEditText.setText("你选择了"+mDataList.get(i)+"吗？");
                // 加入购物车的逻辑
                FoodItem item1 = new FoodItem("汉堡", 22.5);
                FoodItem item2 = new FoodItem("薯条", 12.0);
                addToCart(item1);
                addToCart(item2);
            }
        });


        // 更新购物车信息
        updateCart();

        // 结算按钮的点击事件
        btnCheckout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkout();
            }
        });
    }

    // 添加商品到购物车
    private void addToCart(FoodItem item) {
        cartItems.add(item);
        totalPrice += item.getPrice();
    }

    // 更新购物车信息
    private void updateCart() {
        String cartText = "购物车(" + cartItems.size() + "): ¥" + totalPrice;
        txtCartItems.setText(cartText);
    }

    // 结算
    private void checkout() {
        // 将购物车中的商品生成订单，进行结算等操作
        Toast.makeText(this, "订单已提交，感谢您的惠顾！", Toast.LENGTH_SHORT).show();
        cartItems.clear();
        totalPrice = 0;
        updateCart();
    }
}

MyDatabaseHelper.java

java 复制代码 
package com.lzcu.endactivity;

import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import androidx.annotation.Nullable;


public class MyDatabaseHelper extends SQLiteOpenHelper
{
    //声明数据库的名字和表名
    private static final String DATABASENAME = "Practical.db" ;	// 数据库名称
    private static final int DATABASEVERSION = 1 ;
    private static final String TABLE_USERNAME = "User" ;	// 用户表名称

    public MyDatabaseHelper(@Nullable Context context)
    {
        super(context, DATABASENAME, null, DATABASEVERSION);
    }
    @Override
    public void onCreate(SQLiteDatabase db)
    {
        //创建数据库用户表，并添加三个字段id,Account,Password
        String sqlString="create table "+ TABLE_USERNAME+"( id integer primary key autoincrement,Account varchar(255),Password varchar(255))";
        db.execSQL(sqlString);
    }
    //注册
    public  void Register(String Account,String Password)
    {
        SQLiteDatabase db=super.getWritableDatabase();
        String sqlString="insert into "+TABLE_USERNAME+"(Account,Password) values (?,?)";
        //构造占位符的参数数组
        Object args[]=new Object[]{Account,Password};
        db.execSQL(sqlString,args);//此方法执行的sql语句主要有创建、插入、修改、删除等
        db.close();
    }
    //查询账号的方法
    public Cursor find()
    {
        SQLiteDatabase db=super.getWritableDatabase();
        String sqlString="select * from User;";
        //执行查询，返回数据给游标
        Cursor result =db.rawQuery(sqlString,null);
        return result;
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    }
}

Register.java

java 复制代码 
package com.lzcu.endactivity;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;


import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

public class Register extends AppCompatActivity {
    Button register_lj,back;
    TextView touchScreen;
    EditText Account,Pwd1,Pwd2;
    MyDatabaseHelper myDatabaseHelper;
    ArrayList<User> data = new ArrayList<User>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.register);
        //数据库
        myDatabaseHelper = new MyDatabaseHelper(this);
        //按钮组件
        register_lj =findViewById(R.id.register_but);
        back =findViewById(R.id.back);
        //编辑框
        Account = findViewById(R.id.register_name);
        Pwd1 = findViewById(R.id.register_pwd);
        Pwd2 = findViewById(R.id.register_pwd2);
        //立即注册
        register_lj.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                //获取输入的用户名和密码
                String name = Account.getText().toString().trim();
                String password = Pwd1.getText().toString().trim();
                //获取数据库数据，判断用户名是否已存在
                Cursor result = myDatabaseHelper.find();
                int a=0;
                if (!Account.getText().toString().equals(""))
                {
                    if (Account.getText().toString().length()<6)
                        Toast.makeText(Register.this, "账号创建不能少于6位", Toast.LENGTH_SHORT).show();
                    else if (Pwd1.getText().toString().length()<6)
                        Toast.makeText(Register.this, "密码设置不能少于6位", Toast.LENGTH_SHORT).show();
                    else
                    {
                        for (result.moveToFirst();!result.isAfterLast();result.moveToNext())
                        {
                            //判断数据库是否存在此对象
                            @SuppressLint("Range") String account_1 = result.getString(result.getColumnIndex("Account"));
                            if(Account.getText().toString().equals(account_1))
                            {
                                a=1;
                            }
                        }
                        //关闭游标
                        result.close();
                        if(!Pwd1.getText().toString().equals("") && !Pwd2.getText().toString().equals(""))
                        {
                            if ((Pwd1.getText().toString().equals(Pwd2.getText().toString()) && a==0))
                            {
                                myDatabaseHelper.Register(name,password);
                                Intent intent = new Intent(Register.this, Login.class);
                                startActivity(intent);
                                finish();
                                Toast.makeText(Register.this, "注册成功", Toast.LENGTH_SHORT).show();
                            }
                            else if (a==1)
                                Toast.makeText(getApplicationContext(),"账号已存在,请重新输入账号",Toast.LENGTH_SHORT).show();
                            else
                                Toast.makeText(getApplicationContext(),"两次密码输入不一致",Toast.LENGTH_SHORT).show();
                        } else
                            Toast.makeText(getApplicationContext(),"密码不能为空！",Toast.LENGTH_SHORT).show();
                    }

                } else
                    Toast.makeText(getApplicationContext(),"账号不能为空！",Toast.LENGTH_SHORT).show();
            }
        });
        //返回
        back.setOnClickListener(
                new View.OnClickListener()
                {
                    @Override
                    public void onClick(View v)
                    {
                        //显示注册界面
                        Intent intent = new Intent(Register.this, Login.class);
                        //启动显示修改界面
                        startActivity(intent);
                        finish();
                    }
                })
    }
}

User.java

java 复制代码 
package com.lzcu.endactivity;


public class User
{
    private int id;
    private String account;
    private String password;


    public User( ) {

    }
    public User(int id, String account, String password) {
        this.id = id;
        this.account = account;
        this.password = password;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

activity_main.xml

xml 复制代码 
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:background="@drawable/img">

    <TextView
        android:id="@+id/text_top"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp"
        android:text="外卖点餐"
        android:textColor="@color/black"
        android:textSize="30dp"
        android:textStyle="italic"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

    <EditText
        android:id="@+id/UserName"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"

        android:hint="请输入用户名"
        android:padding="15dp"
        android:singleLine="true"
        android:textSize="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_top" />

    <EditText
        android:id="@+id/Pwd"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:hint="请输入用户密码"
        android:inputType="textPassword"
        android:maxLength="16"
        android:padding="15dp"
        android:singleLine="true"
        android:textSize="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/UserName" />

    <Button
        android:id="@+id/login"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_marginTop="30dp"
        android:text="登录"
        android:textStyle="bold"
        app:layout_constraintEnd_toStartOf="@+id/register"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/Pwd" />

    <Button
        android:id="@+id/register"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_marginTop="30dp"
        android:text="注册"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/login"
        app:layout_constraintTop_toBottomOf="@+id/Pwd" />

</androidx.constraintlayout.widget.ConstraintLayout>

main.xml

xml 复制代码 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/img">

    <!-- 标题栏 -->
    <RelativeLayout
        android:id="@+id/title_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        >

        <TextView
            android:id="@+id/title_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="外卖点餐系统"
            android:textSize="22sp"
            android:textColor="#ffffff" />
    </RelativeLayout>
    <!-- 菜单列表 -->

    <!-- 购物车和结算按钮 -->
    <ListView
        android:id="@+id/menu_list"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <RelativeLayout
        android:id="@+id/cart_layout"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:layout_marginTop="10dp"
        android:background="#ffffff"
        android:padding="0dp">

        <TextView
            android:id="@+id/txt_cart_items"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="购物车(0): ¥0"
            android:textColor="#000000"
            android:textSize="18sp" />

        <Button
            android:id="@+id/btn_checkout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:text="结算"
            android:textColor="#ffffff"
            android:textSize="18sp" />
    </RelativeLayout>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:layout_marginTop="10dp"
        android:background="#ffffff"
        android:padding="0dp">
        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="25dp"
            android:gravity="bottom"
            />
    </RelativeLayout>
</LinearLayout>

register.xml

xml 复制代码 
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Login"
    android:background="@drawable/img"
    tools:ignore="MissingDefaultResource">

    <TextView
        android:id="@+id/text_top"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="90dp"
        android:text="注册界面"
        android:textColor="#141414"
        android:textSize="30dp"
        android:textStyle="italic"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/register_name"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"

        android:hint="请输入用户名"
        android:padding="15dp"
        android:singleLine="true"
        android:textSize="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_top" />

    <EditText
        android:id="@+id/register_pwd"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"

        android:hint="请输入用户密码"
        android:inputType="textPassword"
        android:maxLength="16"
        android:padding="15dp"
        android:singleLine="true"
        android:textSize="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/register_name" />

    <EditText
        android:id="@+id/register_pwd2"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"

        android:hint="请确认密码"
        android:inputType="textPassword"
        android:maxLength="16"
        android:padding="15dp"
        android:singleLine="true"
        android:textSize="24dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.504"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/register_pwd" />

    <Button
        android:id="@+id/register_but"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_marginTop="30dp"

        android:text="立即注册"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/back"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/register_pwd2" />

    <Button
        android:id="@+id/back"
        android:layout_width="120dp"
        android:layout_height="60dp"
        android:layout_marginTop="30dp"

        android:text="返回登录"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toEndOf="@+id/register_but"
        app:layout_constraintTop_toBottomOf="@+id/register_pwd2" />
</androidx.constraintlayout.widget.ConstraintLayout>

xiao效果展示

相关推荐
图王大胜17 分钟前
Android SystemUI组件（11）SystemUIVisibility解读
android·framework·systemui·visibility
服装学院的IT男4 小时前
【Android 13源码分析】Activity生命周期之onCreate,onStart,onResume-2
android
Arms2064 小时前
android 全面屏最底部栏沉浸式
android
服装学院的IT男4 小时前
【Android 源码分析】Activity生命周期之onStop-1
android
ChinaDragonDreamer7 小时前
Kotlin：2.0.20 的新特性
android·开发语言·kotlin
网络研究院9 小时前
Android 安卓内存安全漏洞数量大幅下降的原因
android·安全·编程·安卓·内存·漏洞·技术
凉亭下9 小时前
android navigation 用法详细使用
android
小比卡丘12 小时前
C语言进阶版第17课—自定义类型：联合和枚举
android·java·c语言
前行的小黑炭13 小时前
一篇搞定Android 实现扫码支付：如何对接海外的第三方支付；项目中的真实经验分享；如何高效对接，高效开发
android
落落落sss14 小时前
MybatisPlus
android·java·开发语言·spring·tomcat·rabbitmq·mybatis
热门推荐
01【经验分享】Ubuntu22.04安装微信(linux官方版)02安卓系列机型永久去除data分区加密 详细步骤解析032024年高教社杯数学建模国赛C题超详细解题思路分析04CTF网络安全大赛简单的web抓包题目：HEADache05组基轨迹建模 GBTM的介绍与实现（Stata 或 R）06【2024数模国赛赛题思路公开】国赛B题思路丨附可运行代码丨无偿自提07pve(Proxmox VE)安装i225v网卡驱动08苍穹外卖面试总结09【2024高教社杯全国大学生数学建模竞赛】B题 生产过程中的决策问题——解题思路 代码 论文10RAG 实践- Ollama+RagFlow 部署本地知识库