在放心的情况下，如何获得大于指定值的值

Question

I am a newbie to Rest-Assured api using Java. I want to extract the number of days the temperature of a city is above 18 . Using openweathermap.org.

The url is api.openweathermap.org/data/2.5/forecast?q=Sydney&units=metric&appid={APP KEY}

I get :

{ "cod": "200", "message": 0.0067, "cnt": 40, "list": [ { "dt": 1557727200, "main": { "temp": 20.88, "temp_min": 20.88, "temp_max": 21.05, "pressure": 1025.56, "sea_level": 1025.56, "grnd_level": 1021.14, "humidity": 57, "temp_kf": -0.17 }, "weather": [ { "id": 803, "main": "Clouds", "description": "broken clouds", "icon": "04d" } ], "clouds": { "all": 55 }, "wind": { "speed": 3.45, "deg": 43.754 }, "sys": { "pod": "d" }, "dt_txt": "2019-05-13 06:00:00" }, { "dt": 1557738000, "main": { "temp": 18.45, "temp_min": 18.45, "temp_max": 18.58, "pressure": 1026.06, "sea_level": 1026.06, "grnd_level": 1021.28, "humidity": 73, "temp_kf": -0.13 }, "weather": [ { "id": 804, "main": "Clouds", "description": "overcast clouds", "icon": "04n" } ], "clouds": { "all": 100 }, "wind": { "speed": 3.84, "deg": 28.267 }, "sys": { "pod": "n" }, "dt_txt": "2019-05-13 09:00:00" }, { "dt": 1557759600, "main": { "temp": 14.31, "temp_min": 14.31, "temp_max": 14.35, "pressure": 1026.29, "sea_level": 1026.29, "grnd _level": 1021.87, "humidity": 80, "temp_kf": -0.04 }, "weather": [ { "id": 802, "main": "Clouds", "description": "scattered clouds", "icon": "03n" } ], "clouds": { "all": 28 }, "wind": { "speed": 1.66, "deg": 279.19 }, "sys": { "pod": "n" }, "dt_txt": "2019-05-13 15:00:00" },

}

I am unsure how do i proceed with the iterations. It would be a great help if someone can help me through.

I am able to get the data but not sure how do I get the element from each array

Now, I want to extract the temperatures which are above 18 degrees

I have attempted the below:

public class WeatherForecast {

    public static Response resp;

    @Test
    public void getWeatherForecastForCity()
    {
        RestAssured.baseURI = "https://api.openweathermap.org";



        resp = given().
               param("q", "Sydney").
               param("units", "metric").
               param("appid", "670473f82ba0969a884be548c75236a4").
        when().
                get("/data/2.5/forecast").
        then().
                extract().response();

        List<String> temperatures = resp.getBody().jsonPath().getList("list");
        //String value = temperatures.getString()
        int count = temperatures.size();
        for(int i=0;i<=count;i++)

        {

        }
        System.out.println("List Size: "+temperatures.size());

        //assertEquals(temperatures, greaterThanOrEqualTo(20.00F));

        //String responseString = resp.asString();
        //System.out.println("Response String: "+responseString);
        //JsonPath js = new JsonPath(responseString);

        //Get the number of records for the city
        //int size = js.getList("list").size();
        //int temperature = Integer.parseInt(js.get("count"));
        //System.out.println("Temperature Value: "+js.getString("list[1].main.temp"));

    }

}

Answer 1

RestAssured uses a powerful library called JsonPath which you already used.

The difference of what you already creates is how to get JSONObject/Array inside other JSONObject/Array

You used resp.getBody().jsonPath().getList("list"); which is almost a good starting point. Instead of using List<String> you should use List<HashMap<String, Object>>

Each HashMap<> will be a JSON Object.

Then you can just iterate over the Array to get each object and temperatures.

How to do that:

List<HashMap<String, Object>> list = resp.getBody().jsonPath().getList("list");
for (HashMap<String, Object> jsonObject : list) {
    /**
    * Now, in order to get temperature, we have to get access to `main` element in JSON and then get access to the temperature
    **/
    HashMap<String, Object> mainElements = (HashMap<String, Object>) jsonObject.get("main");
    //No we have JSONObject as HashMap. We can access any temperature
    float temperature = (float) mainElements.get("temp");
    System.out.println(temperature);
}

The above code will print all temperatures. Now you just have to compare float values, save them, assert them or do whatever you want :)

You can access any value with this approach

EDIT: Extract the above code to a method like this:

    private List<HashMap<String, Object>> getJsonObjectsWithTempGreaterThan(JsonPath path, float degrees) {
        List<HashMap<String, Object>> desiredJsonObjects = new ArrayList<>();

        List<HashMap<String, Object>> list = path.getList("list");
        for (HashMap<String, Object> jsonObject : list) {
            HashMap<String, Object> mainElements = (HashMap<String, Object>) jsonObject.get("main");
            float temperature = (float) mainElements.get("temp");
            if (temperature > degrees) {
                desiredJsonObjects.add(jsonObject);
            }
        }

        return desiredJsonObjects;
    }

Above code will store each of JSON Object in a List and then return it. The list will contain JSON Objects with a temperature greater than degrees passed in the parameter.

Then, you can access those elements like this:

List<HashMap<String, Object>> objects = getJsonObjectsWithTempGreaterThan(path, 20);

This is our list of desired objects. If you just want the temperatures, all you have to do is:

for (HashMap<String, Object> jsonObject : objects) {
    HashMap<String, Object> mainElements = (HashMap<String, Object>) jsonObject.get("main");
    //No we have JSONObject as HashMap. We can access any temperature
    float temperature = (float) mainElements.get("temp");
    System.out.println(temperature);
}

This can be achieved much more easily and readable with Java Streams.