Django(python)简单实现android的服务器端

Posted 2020-12-19 千杯湖底沙

Django(python)简单实现android的服务器端

1. 所需工具

PyCharm--python编辑工具，这里要写Django，因此必须是专业版，社区版没有此功能。
MySql--登录信息需要存储到数据库里面。
Android Studio--用于手机端代码的编写。

2. 服务器端的实现

2.1. 新建一个Django项目，命名为:androidSevers
2.2. 为androidSevers添加一个APP模块:Login_sever

python manage.py startapp Login_sever

完成后效果如图所示

2.3. 数据库连接及其setting.py配置
添加APP

连接MySQL(大小写严格区分)

DATABASES = {
    \'default\': {
        \'ENGINE\': \'django.db.backends.mysql\',
        \'NAME\': \'androidsevers\',
        \'USER\': \'root\',
        \'PASSWORD\': \'123456\',
        \'PORT\': 3306,
        \'HOST\': \'\',
    }
}

2.4. 通过设计model.py，映射到数据库。

from django.db import models

# Create your models here.
class Login(models.Model):
    ID=models.AutoField(primary_key=True)
    username=models.CharField(max_length=25,verbose_name=\'用户名\')
    password=models.CharField(max_length=25,verbose_name=\'密码\')
    adminname=models.CharField(max_length=25,verbose_name=\'用户姓名\')

2.5. 将model.py映射到数据库
在pycharm下面的终端下执行
创建迁移文件

python manage.py makemigrations

将迁移文件写入数据库

python manage.py migrate

执行完成后，在数据库里显示，如图所示。

在数据库里写入一条记录，用于测试。如

2.5. 配置路由信息，urls.py

from django.contrib import admin
from django.urls import path

from Login_sever import views

urlpatterns = [
    path(\'admin/\', admin.site.urls),
    path(\'login/\',views.login_view)
]

2.6. 对数据的操作views.py

from django.core.exceptions import ObjectDoesNotExist
from django.http import HttpResponse
from django.shortcuts import render

from Login_sever.models import Login
import json


def login_view(request):
    if request.method==\'POST\':
        username=request.POST.get(\'username\')
        password=request.POST.get(\'password\')
        date_error={
            \'username\': username,
            \'adminname\': \'\',
            \'code\':\'错误，用户不存在\',
            \'Status Code\': 404

        }
        try:
            user=Login.objects.get(username=username)
            if user.password==password:
                data={
                    \'username\':user.username,
                    \'adminname\':user.adminname,
                    \'code\': \'成功\',
                    \'Status Code\': 200
                }
                return HttpResponse(json.dumps(data), content_type=\'application/json\')
            else:
                date_error = {
                    \'username\': username,
                    \'adminname\': \'\',
                    \'code\': \'密码错误\',
                    \'Status Code\': 404
                }
                return HttpResponse(json.dumps(date_error), content_type=\'application/json\')
        except ObjectDoesNotExist:
            return HttpResponse(json.dumps(date_error),content_type=\'application/json\')
    else:
        return HttpResponse(\'GET请求无效\')

2.7. 启动服务器
2.7.1. 查询服务器的IP地址

ipconfig

2.7.2. 在setting里面配置IP地址
将这里修改为你的IP地址

2.7.3. 启动服务器
在pycharm的终端中输入

python manage.py runserver 192.168.0.104:8000

服务器端完成

3. 客户端的实现

3.1. 用android创建一个工程：androidclient
3.2. 新建一个LoginActivity
3.3. 新建一个类Login_cs
完成后如图所示

3.4. 在Login_cs里面写入

public class Login_cs {


    /**
     * username : admin
     * adminname : 李东阳
     * code : 成功
     * Status Code : 200
     */

    private String username;
    private String adminname;
    private String code;
    @SerializedName("Status Code")
    private int _$StatusCode185; // FIXME check this code

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getAdminname() {
        return adminname;
    }

    public void setAdminname(String adminname) {
        this.adminname = adminname;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public int get_$StatusCode185() {
        return _$StatusCode185;
    }

    public void set_$StatusCode185(int _$StatusCode185) {
        this._$StatusCode185 = _$StatusCode185;
    }
}

3.5. 修改配置文件AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.androidclient">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

3.6. 添加依赖

implementation \'com.squareup.okhttp3:okhttp:3.10.0\'
implementation \'com.google.code.gson:gson:2.6.2\'

3.7. 设置activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".LoginActivity">
    <EditText
        android:layout_marginTop="35dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入用户名"
        android:gravity="center"
        android:textSize="25dp"
        android:id="@+id/tvUserName"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入密码"
        android:textSize="25dp"
        android:gravity="center"
        android:inputType="textPassword"
        android:id="@+id/tvPassword"/>
    <Button
        android:id="@+id/btnLogin"
        android:layout_marginTop="25dp"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:background="#03A9F4"
        android:text="登录"
        android:textColor="#fff"
        android:textSize="25dp"
        android:paddingLeft="35dp"
        android:paddingRight="35dp"
        android:layout_height="wrap_content"/>
</LinearLayout>

3.8. 设置LoginActivity.java

package com.example.androidclient;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.gson.Gson;

import java.io.IOException;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class LoginActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText tvUserName;
    private EditText tvPassword;
    private Button btnLogin;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        initView();
    }

    private void initView() {
        tvUserName = (EditText) findViewById(R.id.tvUserName);
        tvPassword = (EditText) findViewById(R.id.tvPassword);
        btnLogin = (Button) findViewById(R.id.btnLogin);

        btnLogin.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnLogin:
                submit();
                break;
        }
    }

    private void submit() {
        // validate
        String tvUserNameString = tvUserName.getText().toString().trim();
        if (TextUtils.isEmpty(tvUserNameString)) {
            Toast.makeText(this, "请输入用户名", Toast.LENGTH_SHORT).show();
            return;
        }

        String tvPasswordString = tvPassword.getText().toString().trim();
        if (TextUtils.isEmpty(tvPasswordString)) {
            Toast.makeText(this, "请输入密码", Toast.LENGTH_SHORT).show();
            return;
        }

        // TODO validate success, do something
        InternetSever(tvUserNameString,tvPasswordString);
    }
    private void InternetSever(String username,String password) {
        OkHttpClient client = new OkHttpClient();
        FormBody body = new FormBody.Builder()
                .add("username", username)
                .add("password", password)
                .build();
        final Request request = new Request.Builder()
                .url("http://192.168.0.104:8000/login/")
                .post(body)
                .build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Toast.makeText(LoginActivity.this, "网络异常，请稍后再试！", Toast.LENGTH_SHORT).show();

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                final String date=response.body().string();
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Gson gson=new Gson();
                        Login_cs login_cs=gson.fromJson(date,Login_cs.class);
                        if (login_cs.get_$StatusCode185()==200){
                            Toast.makeText(LoginActivity.this, "欢迎登录，"+login_cs.getAdminname(), Toast.LENGTH_SHORT).show();
                            startActivity(new Intent(LoginActivity.this,MainActivity.class));
                        }else {
                            Toast.makeText(LoginActivity.this, login_cs.getCode(), Toast.LENGTH_SHORT).show();
                            tvPassword.setText("");
                            tvUserName.setText("");
                        }


                    }
                });

            }
        });


    }
}

客户端完成

4.测试

完成，如有问题晴留言给我哦！
服务器端源码:https://github.com/ldy731729142/androidSevers
客户端源码:https://github.com/ldy731729142/AndroidClient