Android builds MVC architecture for the first time

1_database

2_server

1. Simple setup on the server side

2. Use json, import the jar package and copy this content and open the Baidu
   Netdisk mobile App, which is more convenient to operate. Extraction code: 3afj
   build a folder in the project and paste it into it

3. Conversion between json and list:

import com.alibaba.fastjson.JSON;

import java.util.List;

public class JsonListUtil {
    
    
   /**
    * List<T> 转 json字符串
    */
   public static <T> String listToJson(List<T> ts) {
    
    
      return JSON.toJSONString(ts);
   }

   /**
    * json 字符串转 List<T>
    */
   public static <T> List<T> jsonToList(String jsonString) {
    
    
      @SuppressWarnings("unchecked")
      List<T> ts = (List<T>) JSON.parse(jsonString);
      return ts;
   }
}

3_Client

3.1_ Import okhttp dependency

1. Network request protocol:
   will be <uses-permission android:name="android.permission.INTERNET" />added to Manifest.xml
   

2. Query dependent statement
   Enter the okhttp official website and copy the following statement
   

3. Import dependency
   Switch Android to project, open build.gradle under app project to add dependency
   

4. sync
   
   Note: URL cannot use localhost instead of local ip address