json格式的一些常用操作方法

 package com.liveyc.restfull.until;

 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;

 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.type.JavaType;

 import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;

 public class JsonTools {

     public static Log log = LogFactory.getLog(JsonTools.class);

     private static ObjectMapper objectMapper = new ObjectMapper();
     /**
      *
      * @author JSON工具类
      * @param
      *
      */

     /***
      * 将对象序列化为JSON文本
      * @param object
      * @return
      */
     public static String toJSONString(Object object)
     {
         JSONArray jsonArray = JSONArray.fromObject(object);

         return jsonArray.toString();
     }

     /***
      * 将JSON对象序列化为JSON文本
      * @param jsonObject
      * @return
      */
     public static String toObjString(Object object)
     {
         JSONObject jsonObject = JSONObject.fromObject(object);
         return jsonObject.toString();
     } 

     /***
      * 将对象转换为JSON对象数组
      * @param object
      * @return
      */
     public static JSONArray toJSONArray(Object object)
     {
         return JSONArray.fromObject(object);
     }

     /***
      * 将对象转换为JSON对象
      * @param object
      * @return
      */
     public static JSONObject toJSONObject(Object object)
     {
         return JSONObject.fromObject(object);
     }

     /***
      * 将对象转换为HashMap
      * @param object
      * @return
      */
     public static HashMap toHashMap(Object object)
     {
         HashMap<String, Object> data = new HashMap<String, Object>();
         JSONObject jsonObject = JsonTools.toJSONObject(object);
         Iterator it = jsonObject.keys();
         while (it.hasNext())
         {
             String key = String.valueOf(it.next());
             Object value = jsonObject.get(key);
             data.put(key, value);
         }

         return data;
     }

     public static <T> T json2Bean(String json, Class<T> beanClass) {
         try {
             return objectMapper.readValue(json, beanClass);
         } catch (Exception e) {
             log.error(e);
             new Exception("解析参数出错");
         }
         return null;
     }  

     public static <T> List<T> json2List(String json, Class<T> beanClass) {
         try {
             return (List<T>)objectMapper.readValue(json, getCollectionType(List.class, beanClass));
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }  

     public static String getJsonFromObject(Object obj) {
         try {
             return objectMapper.writeValueAsString(obj);
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }

     public static JavaType getCollectionType(Class<?> collectionClass, Class<?>... elementClasses) {
         return objectMapper.getTypeFactory().constructParametricType(collectionClass, elementClasses);
     }
 }