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a lightweight yet powerful MQ and RPC to build service bus
There is a newer version: 1.0.0-b1
package io.zbus.kit;

import java.io.UnsupportedEncodingException;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.SerializeWriter;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class JsonKit { 
	private static final String DEFAULT_ENCODING = "UTF-8";  
	
	public static Map parseObject(String jsonString) {
		return JSON.parseObject(jsonString);
	} 
	
	public static  T parseObject(String jsonString, Class clazz) {
		try{
			return JSON.parseObject(jsonString, clazz);
		} catch (JSONException e) {
			jsonString = jsonString.replace("@type", "@typeUnknown");
			return JSON.parseObject(jsonString, clazz);
		}
	} 
	
	@SuppressWarnings("unchecked")
	public static  T convert(Object json, Class clazz) { 
		if(json == null){ //fix zbus-java bug#1 
			return null;
		}
		if(clazz.isAssignableFrom(json.getClass())){ 
			return (T)json;
		}
		if(json instanceof JSONObject){
			JSONObject jsonObject = (JSONObject)json;
			return jsonObject.toJavaObject(clazz);
		}
		
		String jsonString = JSON.toJSONString(json);
		return parseObject(jsonString, clazz);
	} 
	
	public static String toJSONString(Object value) {
		return toJSONString(value,DEFAULT_ENCODING);
	}
	
	public static String toJSONString(Object value, String encoding) {
		byte[] data = toJSONBytes(value, encoding);
		try {
			return new String(data, encoding);
		} catch (UnsupportedEncodingException e) {
			return new String(data);
		}
	}
	
	public static String toJSONStringWithType(Object value, String encoding) {
		byte[] data = toJSONBytesWithType(value, encoding);
		try {
			return new String(data, encoding);
		} catch (UnsupportedEncodingException e) {
			return new String(data);
		}
	}
	
	public static byte[] toJSONBytes(Object value, String encoding) {
		return toJSONBytes(value, encoding, 
				//SerializerFeature.WriteMapNullValue, 
				SerializerFeature.DisableCircularReferenceDetect); 
	} 
	
	public static byte[] toJSONBytesWithType(Object value, String encoding) {
		return toJSONBytes(value, encoding, 
				SerializerFeature.DisableCircularReferenceDetect,
				SerializerFeature.WriteClassName); 
	} 
	
	
	private static final byte[] toJSONBytes(Object object, String charsetName,
			SerializerFeature... features) {
		
		if(charsetName == null){
			charsetName = DEFAULT_ENCODING;
		}
		
		SerializeWriter out = new SerializeWriter(); 
		try {
			JSONSerializer serializer = new JSONSerializer(out);
			for (SerializerFeature feature : features) {
				serializer.config(feature, true);
			}

			serializer.write(object);

			return out.toBytes(charsetName);
		} finally {
			out.close();
		}
	}
}