jsonツールクラスのパッケージと解析

package com.chinatelecom.personalcustom.common.util;

import java.io.IOException;

import com.alibaba.fastjson.JSON;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonUtil {
	
	/**
	 *          ，        
	 */
	public static  T jsonToEntity(String json, Class clazz) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        //         
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);
        return mapper.readValue(json, clazz);
    }
	
	/**
	 *     JSON   
	 */
	public static String entityToJson(Object entity){
		return JSON.toJSONString(entity);
	}
	
	/**
	 *       JsonNode，        
	 */
	public static JsonNode jsonToJsonNode(String json) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        //         
        mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS,true);
        //     
        mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES,true);
        return mapper.readValue(json, JsonNode.class);
    }
	
	public static  String objectToJson(Object object, Class cls)throws Exception {
		ObjectMapper mapper = new ObjectMapper();
		mapper.registerSubtypes(cls);
		String reqJson = mapper.writeValueAsString(object);
		return reqJson;
	}
	
}