java - 使用正则表达式从 JSON 响应中提取所有状态代码

Question

我想从 JSON 响应( Elasticsearch 对 bulk request 的响应)中提取所有状态代码，以便我可以计算已创建的文档数量和错误数量。

我应该在以下代码中使用哪个正则表达式？

import java.util.regex.Matcher;
 import java.util.regex.Pattern;    
 ...

 List<String> allCodes = new ArrayList<String>();
 Matcher m = Pattern.compile("regex").matcher(jsonResponseString);
 while (m.find()) {
   allCodes.add(m.group());
 }

JSON 响应示例:

{
  "took": 9,
  "errors": false,
  "items": [
    {
      "index": {
        "_index": "movies",
        "_type": "drama",
        "_id": "123",
        "_version": 68,
        "result": "updated",
        "_shards": {
          "total": 2,
          "successful": 1,
          "failed": 0
        },
        "created": false,
        "status": 200
      }
    },
    {
      "index": {
        "_index": "movies",
        "_type": "drama",
        "_id": "456",
        "_version": 1,
        "result": "created",
        "_shards": {
          "total": 2,
          "successful": 1,
          "failed": 0
        },
        "created": true,
        "status": 201
      }
    }
  ]
}

谢谢!

Answer 1

 List<String> allCodes = new ArrayList<String>();

 Matcher m = Pattern.compile("\"status\": (\\d.*)").matcher(YOUR_TEXT);

while (m.find()) {
        allCodes.add(m.group(1));
    }

    System.out.println(allCodes);

但是我会用你想要的信息创建一个 Pojo:

例如

public class Response {

    int took;
    List<Item> itemList;

        class Item{
            int status;
        }
}

然后使用jackson进行转换。

顺便说一句，elasticsearch有一个java api:https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/index.html所以你不需要处理解析等。