The two most used utility methods to convert Java Pojos from/to Json.

JacksonUtils.java

package directlabs.extra;

import java.io.StringWriter;
import java.io.Writer;

import org.codehaus.jackson.map.ObjectMapper;
import org.springframework.util.Assert;

/**
 * The two most used utility methods to convert Java Pojos from/to Json.
 * Depends on Jackson library.
 * @author jtedilla
 * @see http://jackson.codehaus.org/
 */
public class JacksonUtils {
	private static ObjectMapper mapper;
    static {
            mapper = new ObjectMapper();
            //mapper.getSerializationConfig().setDateFormat(new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss"));
    }

    public static ObjectMapper getMapper() {
            return mapper;
    }
    
    public static String toJson(Object object){
    	Assert.notNull(object, "object cannot be null");
    	Writer strWriter = new StringWriter();
    	try {
			mapper.writeValue(strWriter, object);
		} catch (Exception e) {
			throw new RuntimeException("Exception while converting from Java Pojo to Json.", e);
		}
    	return strWriter.toString();
    }
    
    public static <T> T fromJson(String json, Class<T> clazz) {
    	 try {
             return (T) mapper.readValue(json, clazz);
     } catch (Exception e) {
             throw new RuntimeException("Exception occurred while converting from Json to Java Pojo.", e);
     }
    }
}