JSON数组提取value

Question

如下json串，根据name的值，提取project_id，比如有name值是test3， 想拿到对应的project_id 37：

[{
    "creation_time": "2021-04-02T10:03:31.657Z",
    "current_user_role_ids": null,
    "cve_allowlist": {
        "creation_time": "2021-04-02T10:03:31.660Z",
        "id": 34,
        "items": [],
        "project_id": 34,
        "update_time": "2021-04-02T10:03:31.660Z"
    },
    "metadata": {
        "public": "false"
    },
    "name": "test1",
    "owner_id": 34,
    "owner_name": "test1",
    "project_id": 34,
    "repo_count": 1,
    "update_time": "2021-04-02T10:03:31.657Z"
}, {
    "creation_time": "2021-04-06T01:48:12.097Z",
    "current_user_role_ids": null,
    "cve_allowlist": {
        "creation_time": "2021-04-06T01:48:12.098Z",
        "id": 37,
        "items": [],
        "project_id": 37,
        "update_time": "2021-04-06T01:48:12.098Z"
    },
    "metadata": {
        "public": "false"
    },
    "name": "test3",
    "owner_id": 37,
    "owner_name": "test3",
    "project_id": 37,
    "update_time": "2021-04-06T01:48:12.097Z"
}]

Answer 1

import com.alibaba.fastjson.JSON;

import java.util.List;
import java.util.Map;
import java.util.Optional;

public class Demo {
    public static void main(String[] args) {
        String str = "[{\n" +
                "    \"creation_time\": \"2021-04-02T10:03:31.657Z\",\n" +
                "    \"current_user_role_ids\": null,\n" +
                "    \"cve_allowlist\": {\n" +
                "        \"creation_time\": \"2021-04-02T10:03:31.660Z\",\n" +
                "        \"id\": 34,\n" +
                "        \"items\": [],\n" +
                "        \"project_id\": 34,\n" +
                "        \"update_time\": \"2021-04-02T10:03:31.660Z\"\n" +
                "    },\n" +
                "    \"metadata\": {\n" +
                "        \"public\": \"false\"\n" +
                "    },\n" +
                "    \"name\": \"test1\",\n" +
                "    \"owner_id\": 34,\n" +
                "    \"owner_name\": \"test1\",\n" +
                "    \"project_id\": 34,\n" +
                "    \"repo_count\": 1,\n" +
                "    \"update_time\": \"2021-04-02T10:03:31.657Z\"\n" +
                "}, {\n" +
                "    \"creation_time\": \"2021-04-06T01:48:12.097Z\",\n" +
                "    \"current_user_role_ids\": null,\n" +
                "    \"cve_allowlist\": {\n" +
                "        \"creation_time\": \"2021-04-06T01:48:12.098Z\",\n" +
                "        \"id\": 37,\n" +
                "        \"items\": [],\n" +
                "        \"project_id\": 37,\n" +
                "        \"update_time\": \"2021-04-06T01:48:12.098Z\"\n" +
                "    },\n" +
                "    \"metadata\": {\n" +
                "        \"public\": \"false\"\n" +
                "    },\n" +
                "    \"name\": \"test3\",\n" +
                "    \"owner_id\": 37,\n" +
                "    \"owner_name\": \"test3\",\n" +
                "    \"project_id\": 37,\n" +
                "    \"update_time\": \"2021-04-06T01:48:12.097Z\"\n" +
                "}]";
        List<Map<String, Object>> list = JSON.parseObject(str, List.class);
        Optional<Map<String, Object>> optional = list.stream().filter(map -> map.get("name").toString().equals("test3"))
                .findFirst();
        System.out.println(optional.get().get("project_id"));
    }

}