출처 - http://www.mkyong.com/java/how-to-enable-pretty-print-json-output-jackson/
It’s easy to enable pretty print JSON output in Jackson framework. Take last object to/from json example :
User user = new User();
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.writeValueAsString(user));
It will display JSON in compact mode :
{"age":29,"messages":["msg 1","msg 2","msg 3"],"name":"mkyong"}To enable pretty print, just call the "defaultPrettyPrintingWriter()” like this :
User user = new User();
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.defaultPrettyPrintingWriter().writeValueAsString(user));
Output
{
"age" : 29,
"messages" : [ "msg 1", "msg 2", "msg 3" ],
"name" : "mkyong"
}See a full example.
package com.mkyong.core;
import java.io.IOException;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JacksonExample {
public static void main(String[] args) {
User user = new User();
ObjectMapper mapper = new ObjectMapper();
try {
System.out.println(mapper.defaultPrettyPrintingWriter()
.writeValueAsString(user));
} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
