如何找到rest中响应数组元素的长度或大小有保证

Question

I am new to rest assured. I have tried below code for getting response

RestAssured.baseURI = "http://localhost:8090/api";
Response resp = 
          given().
          when().get("/modules")
         .then().extract().response();

This is JSON response

    [
        {
            "moduleid": "1000",
            "module": "reader",
            "title": "Learn to read",
            "description": "Learn to read and understand code"
        },
       {
        "moduleid": "1005",
        "module": "debug",
        "title": "Can you fix it?",
        "description": "Learn how to uncover logical mistakes"
       },
    ]

How do I get the length or size of the elements of that array.

Answer 1

Since the response document does not tell you the amount of elements (and we are not sure whether the server returns a correct content-size header, you will have to parse the response and count.

Answer 2

You can do something like this:

public static void main(String[] args) {

    RestAssured.baseURI = "http://demo1954881.mockable.io";
    Response resp =
            given().
                    when().get("/modules")
                    .then().extract().response();

    ArrayList<Map> parsed = resp.jsonPath().get();
    List<Map> result = parsed
            .stream()
            .filter(i -> "1000".equals(i.get("moduleid")))
                    .collect(Collectors.toList());

    result.forEach(
            map -> System
                    .out
                    .printf(
                       "Item with [moduleid=%s] has size of %d\n",
                       map.get("moduleid"), map.size())
    );
}

Since you are ware of the response structure it is a simple array of maps. So you serialize it into array of maps and then use regular toolset for manipulating with data.

Answer 3

As above comment, the length here is the number of key-value pair in the json object.

For me, you can choose any object in the array to count the number of key-value pair, but if you want to specify the json object with condition, for example moduleid=1005 , this code would work for you.

Map<String, Object> parsed = resp.jsonPath().get("find {it.moduleid = '1005'}");
int numberOfPair = parsed.keySet().size();
System.out.println(numberOfPair); //4