Question

我有json数据来自服务器端。

如果我使用下一个代码，我就不会打印出一个字符串：

if let json = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers) {
   if let prettyPrintedData = try? JSONSerialization.data(withJSONObject: json, options: .prettyPrinted) {
      print(String(bytes: prettyPrintedData, encoding: String.Encoding.utf8) ?? "NIL")
   }
}

为了使它打印得漂亮，我使用下一个代码：

$sum

但似乎这不是最好的方式。

那么有人知道如何打印传入的jsonData来打印它吗？

Answer 1

您所拥有的产品的略美版本：

X_train = np.array([x.tolist() for x in df['board_in'].values])
y_train = df['target']
y_train = np.array([y for y in df['target'].values])

Answer 2

直接在编码器上使用输出格式设置选项：

let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted

Answer 3

这就是答案。

语言：Objective-C

<块引用>

NSString+PrettyPrint.h

@interface NSString (PrettyPrint)

+ (NSString * _Nonnull)prettifiedJsonStringFromData:(nullable NSData *)data;
+ (NSString * _Nonnull)prettifiedStringFromDictionary:(nullable NSDictionary *)dictionary;

@end

<块引用>

NSString+PrettyPrint.m

#import "NSString+PrettyPrint.h"

@implementation NSString (PrettyPrint)

+ (NSString *)prettifiedStringFromDictionary:(nullable NSDictionary *)dictionary {
    
    if (dictionary == nil) { return @"nil"; }
    
    NSMutableString *returnStr = [NSMutableString stringWithString:@"[ \n"];
    
    for (NSString *key in dictionary) {
        [returnStr appendFormat:@"  %@: %@,\n", key, [dictionary valueForKey:key]];
    }

    [returnStr appendFormat:@"]"];

    return returnStr;
}

+ (NSString *)prettifiedJsonStringFromData:(nullable NSData *)data {
    
    if (data == nil) { return @"nil"; }
    
    NSData *jsonData;
    NSError *error = nil;
    
    NSString *jsonStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    jsonData = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
    id jsonObject = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:&error];
    if (jsonObject == nil) {
        return @"nil (json object from data)";
    } else {
        BOOL isValidJsonObject = [NSJSONSerialization isValidJSONObject:jsonObject];
        if (isValidJsonObject) {
            NSData *finalData = [NSJSONSerialization dataWithJSONObject:jsonObject options:NSJSONWritingPrettyPrinted error:&error];
            //TODO: error description
            NSString *prettyJson = [[NSString alloc] initWithData:finalData encoding:NSUTF8StringEncoding];
            return prettyJson;
        } else {
            return [NSString stringWithFormat:@"%@\n%@", jsonStr, @" (⚠️ Invalid json object ⚠️)\n"];
        }
    }
}

@end

然后在需要使用方法时调用它们。

ex1。为正文、响应等打印 NSData

NSLog(@"body: %@", [NSString prettifiedJsonStringFromData:[request HTTPBody]]);

ex2。打印 NSDictionary

NSLog(@"headers: %@", [NSString prettifiedStringFromDictionary:[request allHTTPHeaderFields]]);

可能你会在日志中得到这些结果。

Answer 4

我无法想到比原生类型漂亮的东西。

SELECT v.seller_number, v.date_visit, v.city_visited, v.status
FROM visit v
WHERE (v.seller_number, v.date_visit) IN
       (SELECT v2.seller_number, MAX(v2.date_visit)
        FROM visit v2
        GROUP BY v2.seller_number
       )
LIMIT 500;

是否有一种比我正在使用的“漂亮打印”json字符串更好的方法

4 个答案: