JSONUtil Embedded Objects
A JSONUtil embedded object provides JSON object methods.
Methods
Method |
Description |
Example |
---|---|---|
Object parse(String jsonStr) |
Converts a JSON character string into an object. |
Assume that variable a is a JSON string. Use the following EL expression to convert the JSON string into an object: #{JSONUtil.parse(a)} |
String toString(Object jsonObject) |
Converts an object to a JSON character string. |
Assume that variable b is an object. Use the following EL expression to convert the object into a JSON string: #{JSONUtil.toString(b)} |
Object path(String jsonStr,String jsonPath) |
Returns the field value in a path specified by the JSON character string. This method is similar to XPath and can be used to retrieve or set JSON by path. You can use . or [] in the path to access members and values. For example, tables[0].table_name. |
The content of variable str is as follows:
{ "cities": [{ "name": "city1", "areaCode": "1000" }, { "name": "city2", "areaCode": "2000" }, { "name": "city3", "areaCode": "3000" }] }
The expression for obtaining the area code of city1 is as follows:
#{JSONUtil.path(str,"cities[0].areaCode")} |
Example
The content of variable str is as follows:
{ "cities": [{ "name": "city1", "areaCode": "1000" }, { "name": "city2", "areaCode": "2000" }, { "name": "city3", "areaCode": "3000" }] }
The expression for obtaining the area code of city1 is as follows:
#{JSONUtil.path(str,"cities[0].areaCode")}
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