Java 将响应转换为带值的键

发布于02月03日

我有一个JPA投影，它返回这样的响应:

[
    {
        "active": 0,
        "created_at": "2023-11-07T18:06:56",
        "blocked": 0
    },
    {
        "active": 13,
        "created_at": "2023-12-07T18:06:56",
        "blocked": 0
    }
]

根据这一预测:

    List<CompaniesResult > result = .....;
    return new ResponseEntity<>(result, HttpStatus.OK);

    public interface CompaniesResult {
    
        LocalDateTime getCreated_at();
    
        Integer getActive();
    
        Integer getBlocked();
    }

我想像这样返回结果:

{
    "2023-11-07T18:06:56" : { "active": 0, "blocked": 0},
    "2024-11-07T18:06:56" : { "active": 20, "blocked": 10}
{

你知道我怎样才能转换这个Java列表吗？

推荐答案

我不确定你的确切要求，但我可能会以另一种方式返回它.但是如果你想这样返回它，你可以使用嵌套映射:

public ResponseEntity<Map<String, Map<String, Integer>>> companyResults() {
    List<CompaniesResult> result = ...; // 
    
    // Create a Map to store the converted data
    Map<String, Map<String, Integer>> convertedData = new HashMap<>();
    
    for (CompaniesResult company : result) {
        LocalDateTime createdAt = company.getCreated_at();
        Integer active = company.getActive();
        Integer blocked = company.getBlocked();
        
        Map<String, Integer> innerJson = new HashMap<>();
        innerJson.put("active", active);
        innerJson.put("blocked", blocked);
        
        convertedData.put(createdAt.toString(), innerJson);
    }
    
    // Return the map as a JSON response
    return new ResponseEntity<>(convertedData, HttpStatus.OK);
}