无法访问 jsonfile 中的特定数据 - Flutter
Can't access specific data in jsonfile - Flutter
我有这个 json 文件：
{
projects: [
{
projectId: 3
projectName: "Complexe hotelier croisette",
workflow: "en cours",
realCalendars: [
{
id: 29,
start: 1630590443000
end: 1648475243000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 30,
start: 1630590443000
end: 1646059643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1639320443000
planned: 164,
actual: 142,
remaining: 25,
resourceTaskNumber: 1,
projectTaskNumber: 18,
leaderId: 8,
resourceIds: [8, 7, 6],
dashbordField: 3,
dashbordTendency: 1,
weatherComments: [
{
message: "weather 5",
date: 1645195643000
source: 1
taskId:0
projectId: 3
authorId: 8,
messageId: 31,
messageParentId: 32
},
{
message: "weather 6",
date: 1643813243000
source: 1
taskId: 0
projectId: 3
authorId: 8,
messageId: 33,
messageParentId: 34
},
{
message: "weather 7",
date: 1642776443000
source: 1
taskId: 0
projectId: 3
authorId: 7,
messageId: 35,
messageParentId: 36
},
],
projectComments: [
{
message: "Time 3",
date: 1642776443000
source: 4
taskId: 3789
projectId: 3
authorId: 7,
messageId: 37,
messageParentId: 38
},
{
message: "Time 4",
date: 1639838843000
source: 4
taskId: 3876
projectId: 3
authorId: 8,
messageId: 39,
messageParentId: 40
},
{
message: "Time 5",
date: 1638888443000
source: 2
taskId: 3258
projectId: 3
authorId: 8,
messageId: 41,
messageParentId: 42
},
],
},
{
projectId: 2
projectName: "Festival de la moutarde de Dijon",
workflow: "objectif",
realCalendars: [
{
id: 23,
start: 1682689643000
end: 1696686443000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 24,
start: 1682689643000
end: 1696686443000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1646059643000
planned: 150,
actual: 0,
remaining: 150,
resourceTaskNumber: 2,
projectTaskNumber: 10,
leaderId: 4,
resourceIds: [4, 6, 7, 8],
dashbordField: 4,
dashbordTendency: 2,
weatherComments: [
{
message: "weather 4",
date: 1674744443000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 25,
messageParentId: 26
}
],
projectComments: [
],
},
{
projectId: 1
projectName: "Red Is Dead",
workflow: "en cours",
realCalendars: [
{
id: 9,
start: 1642430843000
end: 1669387643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 10,
start: 1642430843000
end: 1666705643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1645109243000
planned: 280,
actual: 58,
remaining: 222,
resourceTaskNumber: 5,
projectTaskNumber: 36,
leaderId: 4,
resourceIds: [4,5,6],
dashbordField: 2,
dashbordTendency: 3,
weatherComments: [
{
message: "weather 1",
date: 1645800443000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 11,
messageParentId: 12
},
{
message: "weather 2",
date: 1643986043000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 13,
messageParentId: 14
},
{
message: "weather 3",
date: 1643122043000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 15,
messageParentId: 16
},
],
projectComments: [
{
message: "Time 1",
date: 1642862843000
source: 4
taskId: 1234
projectId: 1
authorId: 5,
messageId: 17,
messageParentId: 18
},
{
message: "Time 2",
date: 1642258043000
source: 4
taskId: 1235
projectId: 1
authorId: 5,
messageId: 19,
messageParentId: 20
},
{
message: "Task 1",
date: 1641826043000
source: 2
taskId: 1234
projectId: 1
authorId: 5,
messageId: 21,
messageParentId: 22
},
],
}
],
avatars: [
{
resourceId: 8,
idSource: 81,
resourceName: "Alain Martoni",
trigram: "AMO",
imgBase64: ""
},
{
resourceId: 4,
idSource: 41,
resourceName: "Odile Deray",
trigram: "ODE",
imgBase64: ""
},
{
resourceId: 7,
idSource: 71,
resourceName: "Patrick Bialès",
trigram: "PBI",
imgBase64: " "
},
{
resourceId: 5,
idSource: 51,
resourceName: "Serge Karamazov",
trigram: "SKA",
imgBase64: ""
},
{
resourceId: 6,
idSource: 61,
resourceName: "Simon Jérémi",
trigram: "SJE",
imgBase64: ""
}
]
}
这里我尝试显示来自 json 的特定数据（这里我想显示“项目”中的内容）
var resp = response.body;
print("mydata : " + resp['projects'].toString());
然后我尝试添加一个json解码：
var resp = jsonDecode(response.body);
print("mydata : " + resp['projects'].toString());
然后json编码：
var resp = jsonEncode(response.body);
print("mydata : " + resp['projects'].toString());
然后两个:
var resp = jsonDecode(jsonEncode(response.body));
print("mydata : " + resp['projects'].toString());
当我尝试仅显示“resp”时，它可以工作，但无法访问 JSON 的特定部分（如“项目”）。唯一有用的是使用 int 并且它显示索引的特定字符，就好像 JSON 被读取为字符串一样。
var resp = jsonDecode(jsonEncode(response.body));
print("mydata : " + resp[0].toString());
//display the first caracter of the JSON
问题是当我读取 POST HTTP 请求的响应时，使用 jsonEncode 然后 jsonDecode 完美地工作，然后我可以轻松访问 JSON：
var response = await http.post(
Uri.parse(url),
body: jsonEncode({
"jsonrpc": "2.0",
"id": "10",
"method": "method",
"params": [someParams]
})
);
var resp = jsonDecode(response.body);
print("response body : " + resp['projects'].toString());
//display the "project" part of the JSON response
但是当尝试访问我的第一个 JSON 文件的特定部分时，所有这些都不起作用。
我的 JSON 文件有问题吗？
感谢您的帮助。
更新：json 中缺少逗号，我更正了它，但仍然是同样的问题
我 运行 你的 JSON 通过 JSON 格式化程序/验证器，是的，你的 json 缺少一些逗号和诸如此类的东西。
查看此 Gist I created for your decoding - run it through DartPad.Dev 并查看。
在通过 jsonDecode 运行 之前，我确保 JSON 是一个正确的字符串，然后我只是简单地访问它的值是这样的：
var decodedJSON = jsonDecode(json);
print(decodedJSON['projects'].length);
print(decodedJSON['projects'][0]['projectName']);
print(decodedJSON['avatars'].length);
print(decodedJSON['avatars'][0]['resourceName']);
我得到了我期望的值：
3
Complexe hotelier croisette
5
Alain Martoni
我认为您的问题格式不正确 JSON 从管道中出来。查看 Gist 并告诉我。
我有这个 json 文件：
{
projects: [
{
projectId: 3
projectName: "Complexe hotelier croisette",
workflow: "en cours",
realCalendars: [
{
id: 29,
start: 1630590443000
end: 1648475243000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 30,
start: 1630590443000
end: 1646059643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1639320443000
planned: 164,
actual: 142,
remaining: 25,
resourceTaskNumber: 1,
projectTaskNumber: 18,
leaderId: 8,
resourceIds: [8, 7, 6],
dashbordField: 3,
dashbordTendency: 1,
weatherComments: [
{
message: "weather 5",
date: 1645195643000
source: 1
taskId:0
projectId: 3
authorId: 8,
messageId: 31,
messageParentId: 32
},
{
message: "weather 6",
date: 1643813243000
source: 1
taskId: 0
projectId: 3
authorId: 8,
messageId: 33,
messageParentId: 34
},
{
message: "weather 7",
date: 1642776443000
source: 1
taskId: 0
projectId: 3
authorId: 7,
messageId: 35,
messageParentId: 36
},
],
projectComments: [
{
message: "Time 3",
date: 1642776443000
source: 4
taskId: 3789
projectId: 3
authorId: 7,
messageId: 37,
messageParentId: 38
},
{
message: "Time 4",
date: 1639838843000
source: 4
taskId: 3876
projectId: 3
authorId: 8,
messageId: 39,
messageParentId: 40
},
{
message: "Time 5",
date: 1638888443000
source: 2
taskId: 3258
projectId: 3
authorId: 8,
messageId: 41,
messageParentId: 42
},
],
},
{
projectId: 2
projectName: "Festival de la moutarde de Dijon",
workflow: "objectif",
realCalendars: [
{
id: 23,
start: 1682689643000
end: 1696686443000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 24,
start: 1682689643000
end: 1696686443000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1646059643000
planned: 150,
actual: 0,
remaining: 150,
resourceTaskNumber: 2,
projectTaskNumber: 10,
leaderId: 4,
resourceIds: [4, 6, 7, 8],
dashbordField: 4,
dashbordTendency: 2,
weatherComments: [
{
message: "weather 4",
date: 1674744443000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 25,
messageParentId: 26
}
],
projectComments: [
],
},
{
projectId: 1
projectName: "Red Is Dead",
workflow: "en cours",
realCalendars: [
{
id: 9,
start: 1642430843000
end: 1669387643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
scheduledCalendars: [
{
id: 10,
start: 1642430843000
end: 1666705643000
type: 0
remark: NULL
status: 0
calendarId: NULL
}
],
lastPlanningModif: 1645109243000
planned: 280,
actual: 58,
remaining: 222,
resourceTaskNumber: 5,
projectTaskNumber: 36,
leaderId: 4,
resourceIds: [4,5,6],
dashbordField: 2,
dashbordTendency: 3,
weatherComments: [
{
message: "weather 1",
date: 1645800443000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 11,
messageParentId: 12
},
{
message: "weather 2",
date: 1643986043000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 13,
messageParentId: 14
},
{
message: "weather 3",
date: 1643122043000
source: 1
taskId: 0
projectId: 1
authorId: 4,
messageId: 15,
messageParentId: 16
},
],
projectComments: [
{
message: "Time 1",
date: 1642862843000
source: 4
taskId: 1234
projectId: 1
authorId: 5,
messageId: 17,
messageParentId: 18
},
{
message: "Time 2",
date: 1642258043000
source: 4
taskId: 1235
projectId: 1
authorId: 5,
messageId: 19,
messageParentId: 20
},
{
message: "Task 1",
date: 1641826043000
source: 2
taskId: 1234
projectId: 1
authorId: 5,
messageId: 21,
messageParentId: 22
},
],
}
],
avatars: [
{
resourceId: 8,
idSource: 81,
resourceName: "Alain Martoni",
trigram: "AMO",
imgBase64: ""
},
{
resourceId: 4,
idSource: 41,
resourceName: "Odile Deray",
trigram: "ODE",
imgBase64: ""
},
{
resourceId: 7,
idSource: 71,
resourceName: "Patrick Bialès",
trigram: "PBI",
imgBase64: " "
},
{
resourceId: 5,
idSource: 51,
resourceName: "Serge Karamazov",
trigram: "SKA",
imgBase64: ""
},
{
resourceId: 6,
idSource: 61,
resourceName: "Simon Jérémi",
trigram: "SJE",
imgBase64: ""
}
]
}
这里我尝试显示来自 json 的特定数据（这里我想显示“项目”中的内容）
var resp = response.body;
print("mydata : " + resp['projects'].toString());
然后我尝试添加一个json解码：
var resp = jsonDecode(response.body);
print("mydata : " + resp['projects'].toString());
然后json编码：
var resp = jsonEncode(response.body);
print("mydata : " + resp['projects'].toString());
然后两个:
var resp = jsonDecode(jsonEncode(response.body));
print("mydata : " + resp['projects'].toString());
当我尝试仅显示“resp”时，它可以工作，但无法访问 JSON 的特定部分（如“项目”）。唯一有用的是使用 int 并且它显示索引的特定字符，就好像 JSON 被读取为字符串一样。
var resp = jsonDecode(jsonEncode(response.body));
print("mydata : " + resp[0].toString());
//display the first caracter of the JSON
问题是当我读取 POST HTTP 请求的响应时，使用 jsonEncode 然后 jsonDecode 完美地工作，然后我可以轻松访问 JSON：
var response = await http.post(
Uri.parse(url),
body: jsonEncode({
"jsonrpc": "2.0",
"id": "10",
"method": "method",
"params": [someParams]
})
);
var resp = jsonDecode(response.body);
print("response body : " + resp['projects'].toString());
//display the "project" part of the JSON response
但是当尝试访问我的第一个 JSON 文件的特定部分时，所有这些都不起作用。
我的 JSON 文件有问题吗？
感谢您的帮助。
更新：json 中缺少逗号，我更正了它，但仍然是同样的问题
我 运行 你的 JSON 通过 JSON 格式化程序/验证器，是的，你的 json 缺少一些逗号和诸如此类的东西。
查看此 Gist I created for your decoding - run it through DartPad.Dev 并查看。
在通过 jsonDecode 运行 之前，我确保 JSON 是一个正确的字符串，然后我只是简单地访问它的值是这样的：
var decodedJSON = jsonDecode(json);
print(decodedJSON['projects'].length);
print(decodedJSON['projects'][0]['projectName']);
print(decodedJSON['avatars'].length);
print(decodedJSON['avatars'][0]['resourceName']);
我得到了我期望的值：
3
Complexe hotelier croisette
5
Alain Martoni
我认为您的问题格式不正确 JSON 从管道中出来。查看 Gist 并告诉我。