带有JSON格式字符串的文件，如何将文件内容读入NSDictionary [英] File with string in JSON format , how to read filecontent into NSDictionary

问题描述

我的应用程序捆绑包中有一个文件"xyz.txt"，其中只有JSON格式的文本. 我想打开文本文件的文件路径，然后将内容读取到NSDictionary.怎么做. 我已经准备好了JSON字符串.只需初始化NSdictionary.如果我直接在代码中初始化，则在传递键和值之前，我需要很多@.我想避免这种情况.这就是原因，我将JSON放在文件"xyz.txt"中

I have a file-"xyz.txt" in my applicaion bundle with just JSON formatted text. I want to open the filepath of the text file and read the content to NSDictionary. How to do that. I already have my JSON string ready. Just need to initliaze to NSdictionary. If I directly initilize in code , i would need lot of @ before evey key and value. and I want to avoid that. That is the reason , i put JSON in a file-"xyz.txt"

我有两种方法- 1.我读取表单文件并使用[[NSDictionary alloc] initWithContentsOfFile:filePath]进行分配； 2.我用很多@将字符串分配给NSDictionay. 我想避免一直使用@

I have two ways - 1.I read form file and assign it using [[NSDictionary alloc] initWithContentsOfFile:filePath]; 2.I assign the string to NSDictionay with lot of @. I want to avoid using @ all the time

我知道我们可以通过NSData做 id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers错误:&错误];

I know we can do via NSData id result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&error];

但是即使在这种情况下，我们也需要使用@来将所有键和值的字符串初始化为NSData.

but even in that case we will need to initialize string to NSData with @ for all key and value.

任何可以从文本文件读取json并将输出分配给NSDictionary的解决方案

Any solution that can read the json from a text file and output assign to a NSDictionary

{
"ABC": [
    {
      "id": "01",
      "score": "0.2"
    },
    {
      "id": "02",
      "score": "0.2"
    }
  ],
  "XYZ": [
    {
      "id": "01",
      "score": "0.9"
    },
    {
      "id": "02",
      "score": "0.9"
    }
   ],
  "PQR": [
    {
      "id": "01",
      "score": "0.9"
    },
    {
      "id": "02",
      "score": "0.3"
    },
    {
      "id": "03",
      "score": "0.2"
    }
   ]
}

推荐答案

使用NSData的dataWithContentsOfFile方法获取文件数据(文件路径应为捆绑软件中文件的路径；有一种方法可以从应用程序主捆绑包中获取资源的路径).

Get the file's data using NSData's dataWithContentsOfFile method (the file path should be the path to the file in the bundle; there is a method that can get you the path of a resource from the app main bundle).

然后使用NSJSONSerialization的JSONObjectWithData方法从JSON数据创建NSDictionary.

Then use NSJSONSerialization's JSONObjectWithData method to create a NSDictionary from the JSON data.

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