How to force JSON-lib's JSONObject.put(..) to escape a string containing JSON?
When using JSON-lib's JSONObject
, how can I stop the put
method from storing a String which contains JSON as JSON rather than as an escaped string?
For instance:
JSONObject obj = new JSONObject();
obj.put("jsonStringValue","{\"hello\":\"world\"}");
obj.put("naturalStringValue", "\"hello world\"");
System.out.println(obj.toString());
System.out.println(obj.getString("jsonStringValue"));
System.out.println(obj.getString("naturalStringValue"));
prints:
{"jsonStringValue":{"hello":"world"},"naturalStringValue":"\"hello world\""}
{"hello":"world"}
"hello world"
and I want it to print:
{"jsonStringValue":"{\"hello\":\"world\"}","naturalStringValue":"\"hello world\""}
{"hello":"world"}
"hello world"
Yes, I realize this is obnoxious. However, this is in support of a JSON serialization pipeline for which, for interoperability's sake, this is the expected behavior. There are cases in which we would be serializing user input which may be/contain valid JSON. We wouldn't want the user input to become a part of the JSON object that we're serializing said input to.
Manual escaping doesn't work because it causes JSON-lib to escape the \
characters:
JSONObject obj = new JSONObject();开发者_StackOverflow
obj.put("naturalJSONValue","{\"hello\":\"world\"}");
obj.put("escapedJSONValue", "{\\\"hello\\\":\\\"world\\\"}");
System.out.println(obj.toString());
System.out.println(obj.getString("naturalJSONValue"));
System.out.println(obj.getString("escapedJSONValue"));
Output:
{"naturalJSONValue":{"hello":"world"},"escapedJSONValue":"{\\\"hello\\\":\\\"world\\\"}"}
{"hello":"world"}
{\"hello\":\"world\"}
At this point, any workarounds to enable manual selective escaping of a complex JSON object would completely negate the value of using JSON-lib in the first place.
Also, I understand that this question has been asked before, but unfortunately I cannot accept its answer so easily. JSON-lib is a heavily-used dependency in many areas of my project and swapping it out would be a big undertaking. I need to be absolutely sure that there's no way to achieve this goal with JSON-lib before I can entertain a swap to Jackson, simple-json, or Gson.
This worked for me with json-lib 2.4:
System.out.println(
new JSONStringer()
.object()
.key("jsonStringValue")
.value("{\"hello\":\"world\"}")
.key("naturalStringValue")
.value("\"hello world\"")
.endObject()
.toString());
The output is:
{"jsonStringValue":"{\"hello\":\"world\"}","naturalStringValue":"\"hello world\""}
Use single quotes to quote the string. From the documentation:
Strings may be quoted with ' (single quote).
Strings do not need to be quoted at all if they do not begin with a quote or single quote, and if they do not contain leading or trailing spaces, and if they do not contain any of these characters: { } [ ] / \ : , = ; # and if they do not look like numbers and if they are not the reserved words true, false, or null.
So modifying your example:
net.sf.json.JSONObject obj = new net.sf.json.JSONObject();
obj.put("jsonStringValue","{\"hello\":\"world\"}");
obj.put("quotedJsonStringValue","\'{\"hello\":\"world\"}\'");
obj.put("naturalStringValue", "\"hello world\"");
System.out.println(obj.toString());
System.out.println(obj.getString("jsonStringValue"));
System.out.println(obj.getString("quotedJsonStringValue"));
System.out.println(obj.getString("naturalStringValue"));
Produces:
{"jsonStringValue":{"hello":"world"},"quotedJsonStringValue":"{\"hello\":\"world\"}","naturalStringValue":"\"hello world\""}
{"hello":"world"}
{"hello":"world"}
"hello world"
Note how quotedJsonStringValue
has been treated as a string value and not JSON, and appears quoted in the output JSON.
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