漂亮的將字符串打印為JSON格式

Question

我執行一個AWS命令以檢索現貨價格歷史記錄。

DescribeSpotPriceHistoryRequest request = new DescribeSpotPriceHistoryRequest().withEndTime(start)
        .withInstanceTypes("m1.xlarge").withProductDescriptions("Linux/UNIX (Amazon VPC)").withStartTime(end);
        DescribeSpotPriceHistoryResult response = client.describeSpotPriceHistory(request);
        System.out.println(response.toString());

我獲得了json格式的結果，但我收到了類似String的結果：

{SpotPriceHistory: [{AvailabilityZone: us-east-1d,InstanceType: m1.xlarge,ProductDescription: Linux/UNIX,SpotPrice: 0.035000,Timestamp: Wed Nov 07 00:18:50 CET 2018}, {AvailabilityZone: us-east-1c,InstanceType: m1.xlarge,ProductDescription: Linux/UNIX,SpotPrice: 0.035000,Timestamp: Wed Nov 07 00:18:50 CET 2018}, {AvailabilityZone: us-east-1b,InstanceType: m1.xlarge,ProductDescription: Linux/UNIX,SpotPrice: 0.035000,Timestamp: Wed Nov 07 00:18:50 CET 2018}, {AvailabilityZone: us-east-1a,InstanceType: m1.xlarge,ProductDescription: Linux/UNIX,SpotPrice: 0.035000,Timestamp: Wed Nov 07 00:18:50 CET 2018}, {AvailabilityZone: us-east-1e,InstanceType: m1.xlarge,ProductDescription: Linux/UNIX,SpotPrice: 0.350000,Timestamp: Thu Sep 20 01:08:39 CEST 2018}]}

我的問題是：如何改善結果的顯示？ 喜歡

        {
            "Timestamp": "2018-09-08T17:07:14.000Z", 
            "AvailabilityZone": "us-east-1d", 
            "InstanceType": "p2.16xlarge", 
            "ProductDescription": "Linux/UNIX", 
            "SpotPrice": "4.320000"
        }, 
        {
            "Timestamp": "2018-09-08T17:07:14.000Z", 
            "AvailabilityZone": "us-east-1c", 
            "InstanceType": "p2.16xlarge", 
            "ProductDescription": "Linux/UNIX", 
            "SpotPrice": "4.320000"
        }, 
        {
            "Timestamp": "2018-09-08T17:07:14.000Z", 
            "AvailabilityZone": "us-east-1b", 
            "InstanceType": "p2.16xlarge", 
            "ProductDescription": "Linux/UNIX", 
            "SpotPrice": "4.320000"
        }, 
        {
            "Timestamp": "2018-09-08T12:32:28.000Z", 
            "AvailabilityZone": "us-east-1e", 
            "InstanceType": "p2.16xlarge", 
            "ProductDescription": "Linux/UNIX", 
            "SpotPrice": "4.320000"
        }
    ]
}

Answer 1

您在響應對象上調用.toString() ，請謹慎操作，因為不能保證始終是json，正如您在上面看到的那樣，它甚至不是有效的json，因為它缺少屬性名稱周圍的引號和價值觀。

獲得所需內容的一種方法是調用response.getSpotPriceHistory()以獲取現貨價格數組，然后將其傳遞給ObjectMapper並將其編寫為漂亮的字符串，如下所示：

public static void main(String[] args) throws IOException {

    AmazonEC2 client = AmazonEC2Client.builder().build();
    DescribeSpotPriceHistoryRequest request = new DescribeSpotPriceHistoryRequest()
        .withEndTime(new Date())
        .withInstanceTypes("m1.xlarge").withProductDescriptions("Linux/UNIX (Amazon VPC)")
        .withStartTime(new Date());
    DescribeSpotPriceHistoryResult response = client.describeSpotPriceHistory(request);

    ObjectMapper mapper = new ObjectMapper();
    String asPrettyJSon = mapper.writerWithDefaultPrettyPrinter()
        .writeValueAsString(response.getSpotPriceHistory());
    System.out.println(asPrettyJSon);
    }

Answer 2

兩者都代表一個包含相同結構的jsonObjects的json數組。 顯示結果將取決於您的前端實現，而不是jsonRespense的布局。