How to determine whether a string is in json format in java

#1. Simply judge whether it is in json format. Judgment rules: judge whether the first and last letters are {} or []. If they are neither, it is not a text in JSON format.

The code is implemented as follows:

public static boolean getJSONType(String str) {
	boolean result = false;
	if (StringUtils.isNotBlank(str)) {
		str = str.trim();
		if (str.startsWith("{") && str.endsWith("}")) {
			result = true;
		} else if (str.startsWith("[") && str.endsWith("]")) {
			result = true;
		}
	}
	return result;
}

2, Judged by fastjson parsing, if the parsing is successful, it is json format; otherwise, it is not json format

The code is implemented as follows:

public static boolean isJSON2(String str) {
	boolean result = false;
	try {
		Object obj=JSON.parse(str);
		result = true;
	} catch (Exception e) {
		result=false;
	}
	return result;
}

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