The BOM header for the deep pit of JSON parsing

Preface: When we deal with JSON strings, we often encounter this problem org.json.JSONException:Value of type java.lang.String cannot be converted to Jsonobject, The Jsonobject object throws this exception when parsing the JSON string returned by the server. In fact, this is the return JSON string containing the BOM header caused.

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what is JSON?  

JSON (JavaScript Object Notation) is a lightweight data interchange format. It is based on a subset of ECMAScript. JSON takes a completely language-independent text format, but also uses a similar idiom to the C language family (c, C + +, C #, Java, JavaScript, Perl, Python, and so on). These features make JSON an ideal data exchange language. Easy to read and write, but also easy to machine parse and generate (typically used to improve network transfer rates).

what is a BOM header?

in the Utf-8 encoded file, the BOM in the file header, occupies three bytes, used to indicate that the file belongs to the Utf-8 encoding, now has a lot of software to identify the BOM header, but also some do not recognize the BOM header, such as PHP does not recognize the BOM header, This is also the reason why the error occurs when you edit Utf-8 encoding with Notepad.

to remove the BOM header:

1, EditPlus to the BOM head method
After the editor is resized to UTF8 encoded format, the saved file will be preceded by a string of hidden characters (also known as BOMs), used by the editor to identify whether the file is encoded in UTF8.
Run EditPlus, click Tools, select Preferences, select File, UTF-8 identity Select Always delete signature,
then the PHP files are edited and saved by the PHP file is not with the BOM.

2, UltraEdit removal of BOM head method
after opening the file, Save As option in the encoding format selected (Utf-8 without BOM header), OK is OK

The use of JSON is almost a year, and have encountered a number of inexplicable parsing error! The reason is because the JSON file generated in Utf-8 has a BOM header

For example, the JSON in this picture below

650) this.width=650; "src=" Http://www.echohoo.com/content/uploadfile/201607/2b341467527376.png "title=" Click to view original "alt = "Bom_json.png" border= "0" height= "465" width= ""/> "

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The BOM header for the deep pit of JSON parsing