CODEWITHSUNDEEP
spring-integration
haju
haju

Reputation: 1298

Spring Integration - Transformer - Pretty print json string

If I have a un-formatted JSON as a String object , can I use a spring integration JSON transformer to pretty print it properly? I didn't see any attributes in reference documentation for pretty printing.

Upvotes: 0

Views: 514

Answers (1)

Gary Russell
Gary Russell

Reputation: 174564

Not out of the box, but you can do it easy enough with Jackson in a POJO transformer - note that you have to convert the JSON to an object and back again...

private final ObjectMapper mapper = new ObjectMapper();

@Transformer(inputChannel = "foo", outputChannel = "bar")
public String transform(String in) throws Exception {
//  System.out.println(in);
    String out = new String(
            mapper.writerWithDefaultPrettyPrinter().writeValueAsBytes(mapper.readValue(in, Object.class)));
//  System.out.println(out);
    return out;
}

or...

<int:transformer input-channel="foo" output=channel="bar" ref="myJsonPrettyfier" />

...if you are using XML.

You could probably even use an expression; something like...

<int:transformer ...
    expression="new String(@mapper.writerWithDefaultPrettyPrinter().writeValueAsBytes(@mapper.readValue(in, Object.class)))" />

Where mapper is a <bean/> for the ObjectMapper.

Upvotes: 1

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