Dart Http Client 返回截断的响应，当我打印到控制台时截断略有不同

Question

我正在尝试读取 JSON 响应并使用 Flutter 的 FutureBuilder 构建 UI，但我无法在客户端上获取整个 JSON 响应。当我尝试在两个不同的打印语句中打印响应时，它们之间的内容略有不同。请注意以下控制台打印输出对于 My Posts API Response 和 My Posts Json Response String 有何不同。

有人可以解释这种行为以及如何在客户端接收到完整的 JSON 数组之前实现正确的侦听吗？

预期的 API 响应 -

[{"_id":"5bd11c9b8a9fc0a744d1bebc","postId":1,"postUserId":1,"postDescription":"First Post with 2 Photos","postLongDescription":"First Post with 2 Photos","postDateTime":"2018-07-27T10:50:42.389Z","postLocationId":1,"postHasMedia":true,"postActive":true,"postLikesCount":3,"postCommentsCount":1},{"_id":"5bd11c9b8a9fc0a744d1bebd","postId":2,"postUserId":2,"postDescription":"Second Post with 1 Video","postLongDescription":"Second Post with 1 Video","postDateTime":"2018-07-27T11:02:00.389Z","postLocationId":2,"postHasMedia":true,"postActive":true,"postLikesCount":12,"postCommentsCount":2},{"_id":"5bd11c9b8a9fc0a744d1bebe","postId":3,"postUserId":2,"postDescription":"Third Post with No Video","postLongDescription":"Third Post with No Video","postDateTime":"2018-07-27T11:12:34.389Z","postLocationId":3,"postHasMedia":false,"postActive":true,"postLikesCount":9,"postCommentsCount":0},{"_id":"5bd11c9b8a9fc0a744d1bebf","postId":4,"postUserId":3,"postDescription":"Fourth Post with 1 Photo but Disabled","postLongDescription":"Fourth Post with 1 Photo but Disabled","postDateTime":"2018-07-27T11:12:34.389Z","postLocationId":2,"postHasMedia":true,"postActive":false,"postLikesCount":4,"postCommentsCount":0}]

Flutter Bloc 代码 -

import 'dart:async';
import 'dart:convert';
import 'dart:io';
import 'package:MyApp/models/post_model.dart';    
import 'package:http/http.dart' as http;    

enum storyTypes {
    timeline,
    myposts
}

class PostsBloc {

Future<PostModel> getPosts(storyTypes storyType) async {
    if (storyType == storyTypes.myposts) {
        final String url = "http://127.0.0.1:8081/posts/all";
        return await http.get(url).then((getMyPostsApiResponse) {
            if (getMyPostsApiResponse.statusCode != 200) {
            throw Exception("Error with http over network");
            }
            else {
            if (getMyPostsApiResponse.statusCode == 200) {
                print('My Posts API Response - ' + getMyPostsApiResponse.body);                    
                print('My Posts Json Response String - ' + json.decode(getMyPostsApiResponse.body).toString());
                return PostModel.fromJson(json.decode(getMyPostsApiResponse.body));
            }
            else {
                throw Exception('Failed to load post');
            }
            }
        });
    }
}

Flutter 控制台输出 -

I/flutter (32316): My Posts API Response - [{"_id":"5bd11c9b8a9fc0a744d1bebc","postId":1,"postUserId":1,"postDescription":"First Post with 2 Photos","postLongDescription":"First Post with 2 Photos","postDateTime":"2018-07-27T10:50:42.389Z","postLocationId":1,"postHasMedia":true,"postActive":true,"postLikesCount":3,"postCommentsCount":1},{"_id":"5bd11c9b8a9fc0a744d1bebd","postId":2,"postUserId":2,"postDescription":"Second Post with 1 Video","postLongDescription":"Second Post with 1 Video","postDateTime":"2018-07-27T11:02:00.389Z","postLocationId":2,"postHasMedia":true,"postActive":true,"postLikesCount":12,"postCommentsCount":2},{"_id":"5bd11c9b8a9fc0a744d1bebe","postId":3,"postUserId":2,"postDescription":"Third Post with No Video","postLongDescription":"Third Post with No Video","postDateTime":"2018-07-27T11:12:34.389Z","postLocationId":3,"postHasMedia":false,"postActive":true,"postLikesCount":9,"postCommentsCount":0},{"_id":"5bd11c9b8a9fc0a744d1bebf","postId":4,"postUserId":3,"postDescription":"Fourth Post with 1 Photo but Dis    
I/flutter (32316): My Posts Json Response String - [{_id: 5bd11c9b8a9fc0a744d1bebc, postId: 1, postUserId: 1, postDescription: First Post with 2 Photos, postLongDescription: First Post with 2 Photos, postDateTime: 2018-07-27T10:50:42.389Z, postLocationId: 1, postHasMedia: true, postActive: true, postLikesCount: 3, postCommentsCount: 1}, {_id: 5bd11c9b8a9fc0a744d1bebd, postId: 2, postUserId: 2, postDescription: Second Post with 1 Video, postLongDescription: Second Post with 1 Video, postDateTime: 2018-07-27T11:02:00.389Z, postLocationId: 2, postHasMedia: true, postActive: true, postLikesCount: 12, postCommentsCount: 2}, {_id: 5bd11c9b8a9fc0a744d1bebe, postId: 3, postUserId: 2, postDescription: Third Post with No Video, postLongDescription: Third Post with No Video, postDateTime: 2018-07-27T11:12:34.389Z, postLocationId: 3, postHasMedia: false, postActive: true, postLikesCount: 9, postCommentsCount: 0}, {_id: 5bd11c9b8a9fc0a744d1bebf, postId: 4, postUserId: 3, postDescription: Fourth Post with 1 Photo but Disabled, postLongDescr

Answer 1

看起来您在 Android 上尝试打印一个长字符串。引用documentation about debugging：

Dart print() 函数输出到系统控制台，你可以 使用颤振日志查看（基本上是 adb 的包装器） 日志猫）。

如果你一次输出太多，那么 Android 有时会丢弃一些 日志行。为了避免这种情况，你可以使用来自 Flutter 的 debugPrint() 基础图书馆。这是 print 的包装，可以限制 输出到避免被 Android 内核丢弃的级别。

所以您可以尝试改用debugPrint。

导入 Flutter 包以使用 debugPrint - import 'package:flutter/foundation.dart';

Answer 2

这只是控制台在这么多字符后截断。

请注意，您正在打印两种不同的东西：

getMyPostsApiResponse.body是从服务器接收到的json。

json.decode(getMyPostsApiResponse.body).toString()是解码后的List的toString（不包括引号，这就是字符串长度不同的原因）