android客户端通过OkHttp传递给服务器三个参数,服务器端如何用flask接收这些参数,并查询mysql得到一个查询结果,返回客户端一个list,客户端如何接收这个list(Hashmap<String,String>),请给出详细代码

好的，我会根据您的要求回答问题。以下是您所需的代码：

首先是客户端通过OkHttp传递给服务器三个参数的代码：

OkHttpClient client = new OkHttpClient();

// 三个参数，分别是param1，param2，param3
RequestBody requestBody = new MultipartBody.Builder()
    .setType(MultipartBody.FORM)
    .addFormDataPart("param1", param1)
    .addFormDataPart("param2", param2)
    .addFormDataPart("param3", param3)
    .build();

Request request = new Request.Builder()
    .url(url)
    .post(requestBody)
    .build();

Response response = client.newCall(request).execute();
String responseData = response.body().string();

接下来是服务器端使用Flask接收这些参数的代码，并查询MySQL得到一个查询结果，返回给客户端一个List：

from flask import Flask, request
import pymysql

app = Flask(__name__)

@app.route('/', methods=['POST'])
def get_data():
    # 通过request获取客户端传递过来的参数
    param1 = request.form.get('param1', '').strip()
    param2 = request.form.get('param2', '').strip()
    param3 = request.form.get('param3', '').strip()

    # 连接MySQL，执行查询操作
    db = pymysql.connect(host='localhost', user='root', password='123456', database='test', charset='utf8')
    cursor = db.cursor()
    sql = """SELECT * FROM table_name WHERE param1=%s AND param2=%s AND param3=%s"""
    cursor.execute(sql, (param1, param2, param3))
    results = cursor.fetchall()

    # 将查询结果封装成List
    data = []
    for row in results:
        item = {
            'key1': row[0],
            'key2': row[1],
            'key3': row[2],
            # ...
        }
        data.append(item)

    # 返回查询结果给客户端
    return {'data': data}

if __name__ == '__main__':
    app.run()

最后是客户端接收服务器返回的List的代码：

// 发起网络请求，获取服务器返回的数据
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
    .url(url)
    .build();
Response response = client.newCall(request).execute();
String responseData = response.body().string();

// 解析服务器返回的List
List<HashMap<String, String>> dataList = new ArrayList<>();
JSONObject jsonObject = new JSONObject(responseData);
JSONArray dataArray = jsonObject.getJSONArray("data");
for (int i = 0; i < dataArray.length(); i++) {
    JSONObject itemObject = dataArray.getJSONObject(i);
    HashMap<String, String> itemMap = new HashMap<>();
    itemMap.put("key1", itemObject.getString("key1"));
    itemMap.put("key2", itemObject.getString("key2"));
    itemMap.put("key3", itemObject.getString("key3"));
    // ...
    dataList.add(itemMap);
}