JSONUtil(JAVA对象/List与json互转，xml与json互转)

 package com.chauvet.utils.json;

 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileWriter;
 import java.io.InputStreamReader;
 import java.util.List;

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

 import org.apache.commons.lang.StringUtils;

 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;

 public class JsonUtils {
     private final static Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
     private static XMLSerializer xmlserializer = new XMLSerializer();

     public static Gson getInstance(){
         return gson;
     }

     /***
      * List 转为 JSON
      * @param list
      * @return
      */
     public static <T> String list2Json(List<T> list) {
         if(null != list && list.size() > 0){
             JSONArray jsonArray = JSONArray.fromObject(list);
             return jsonArray.toString();
         }
         return "";
     }

     /***
      * JSON 转换为 List
      * @param jsonStr
      *         [{"age":12,"createTime":null,"id":"","name":"wxw","registerTime":null,"sex":1},{...}]
      * @param objectClass
      * @return
      */
     @SuppressWarnings("unchecked")
     public static <T> List<T> json2List(String jsonStr, Class<T> objectClass){
         if (StringUtils.isNotBlank(jsonStr)) {
             JSONArray jsonArray = JSONArray.fromObject(jsonStr);
             List<T> list = (List<T>) JSONArray.toCollection(jsonArray, objectClass);
             return list;
         }
         return null;
     }  

     /***
      * Object 转为  JSON
      * @param object
      * @return
      */
     public static String object2Json(Object object) {
         if(null != object){
             JSONArray jsonArray = JSONArray.fromObject(object);
             return jsonArray.toString();
         }
         return "";
     }

     /***
      *
      * JSON 转 Object
      *
      * @param jsonStr
      *         [{"age":12,"createTime":null,"id":"","name":"wxw","registerTime":null,"sex":1}]
      * @param objectClass
      * @return
      */
     @SuppressWarnings("unchecked")
     public static <T> T json2Ojbect(String jsonStr,  Class<T> objectClass){
         if(null != jsonStr){
             String leftStr = jsonStr.substring(0,2);
             String rightStr = jsonStr.substring(jsonStr.length()-2,jsonStr.length());
             if(leftStr.equals("[{")){
                 jsonStr = jsonStr.substring(1,jsonStr.length());
             }
             if(rightStr.equals("}]")){
                 jsonStr = jsonStr.substring(0,jsonStr.length()-1);
             }
             JSONObject jsonStu = JSONObject.fromObject(jsonStr);
             return (T) JSONObject.toBean(jsonStu,objectClass);
         }
         return null;
     }

     /***
      * JsonArray 转为 JSON
      * @param jsonArray
      * @return
      */
     public static String jsonArrayToJSONString(JSONArray jsonArray) {
         if(null != jsonArray){
             return jsonArray.toString();
         }
         return "";
     }

     /***
      * JsonObject 转为  JSON
      * @param jsonObject
      * @return
      */
     public static String jsonObjectToJSONString(JSONObject jsonObject) {
         if(null != jsonObject){
             return jsonObject.toString();
         }
         return "";
     } 

     /***
      * 将Object转换为JsonObject
      * @param object
      * @return
      */
     public static JSONObject object2JsonObject(Object object) {
         if(null != object){
             return JSONObject.fromObject(object);
         }
         return null;
     }

     /***
      * XML 转为 JSON
      * @param xmlString
      *             XML字符串  例如：
      *                     <?xml version='1.0' encoding='utf-8'?><cities><province name='北京'><item>东城区</item><item>西城区</item><item>崇文区</item><item>宣武区</item><item>朝阳区</item><item>丰台区</item><item>石景山区</item><item>海淀区</item><item>门头沟区</item><item>房山区</item><item>通州区</item><item>顺义区</item><item>昌平区</item><item>大兴区</item><item>怀柔区</item><item>平谷区</item><item>密云县</item><item>延庆县</item></province></cities>
      * @return
      *
      */
     public static String xml2json(String xmlString){
         if(StringUtils.isNotBlank(xmlString)){
             try {
                 return xmlserializer.read(xmlString).toString();
             } catch (Exception e) {
                 e.printStackTrace();
                 return null;
             }
         }
         return null;
     }

     /***
      * JSON 转为      XML
      * @param xmlString
      *             XML字符串  例如：
      *                     [{'province':{'@name':'北京','item':['东城区','西城区','崇文区','宣武区','朝阳区','丰台区','石景山区','海淀区','门头沟区','房山区','通州区','顺义区','昌平区','大兴区','怀柔区','平谷区','密云县','延庆县']}}]
      *                  或者：
      *                  {'province':{'@name':'北京','item':['东城区','西城区','崇文区','宣武区','朝阳区','丰台区','石景山区','海淀区','门头沟区','房山区','通州区','顺义区','昌平区','大兴区','怀柔区','平谷区','密云县','延庆县']}}
      * @return
      *
      */
     public static String json2xml(String jsonStr){
         if(StringUtils.isNotBlank(jsonStr)){
             try {
                 if(jsonStr.contains("[{") && jsonStr.contains("}]")){
                     JSONArray jobj = JSONArray.fromObject(jsonStr);
                     return xmlserializer.write(jobj);
                 }
                 JSONObject jobj = JSONObject.fromObject(jsonStr);
                 return xmlserializer.write(jobj);
             } catch (Exception e) {
                 e.printStackTrace();
                 return null;
             }
         }
         return null;
     }

     /***
      * XML/JSON 互转
      *
      * @param sourceFilePath
      *                 要解析的文件路径
      * @param directFilePath
      *              生成文件存放的路径
      * @param flag
      *             true:JSON 转为 XML
      *             false:XML转为 JSON
      * @return
      */
     public static String xml2JsonOrjson2Xml(String sourceFilePath,String directFilePath,boolean flag){
         if(StringUtils.isBlank(sourceFilePath) || StringUtils.isBlank(directFilePath)){
             return null;
         }
         FileInputStream in =null;
         BufferedReader br = null;
         FileWriter fw = null;
         String rs = null;
         try{
             File jsonFile = new File(sourceFilePath);
             in = new FileInputStream(jsonFile);
             StringBuffer sbuf = new StringBuffer();
             br = new BufferedReader(new InputStreamReader(in));
             String temp =null;

             while((temp=br.readLine())!=null){
                 sbuf.append(temp);
             }
             if(flag){
                 rs  = json2xml(sbuf.toString());
             }else{
                 rs  = xml2json(sbuf.toString());
             }
             File test = new File(directFilePath);
             if(!test.exists()){
                 test.createNewFile();
             }
             fw = new FileWriter(test);
             fw.write(rs);
          }catch (Exception e) {
              e.printStackTrace();
         }finally{
             try {
                 fw.close();
                 br.close();
                 in.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
         return rs;
     }

     public static void main(String[] args) {

 //        System.out.println(jfxfTranspose("E:/qwe.json", "E:/qwe.xml", 1));

 //        System.out.println(json2xml("[{'province':{'@name':'北京','item':['东城区','西城区','崇文区','宣武区','朝阳区','丰台区','石景山区','海淀区','门头沟区','房山区','通州区','顺义区','昌平区','大兴区','怀柔区','平谷区','密云县','延庆县']}}]"));
 //        System.out.println(xml2json("<?xml version='1.0' encoding='utf-8'?><cities><province name='北京'><item>东城区</item><item>西城区</item><item>崇文区</item><item>宣武区</item><item>朝阳区</item><item>丰台区</item><item>石景山区</item><item>海淀区</item><item>门头沟区</item><item>房山区</item><item>通州区</item><item>顺义区</item><item>昌平区</item><item>大兴区</item><item>怀柔区</item><item>平谷区</item><item>密云县</item><item>延庆县</item></province></cities>"));

         /*User u = new User();
         u.setName("wxw");
         u.setAge(12);
         u.setSex(1);
         System.out.println(object2JsonObject(u));*/

         /*User u = new User();
         u.setName("wxw");
         u.setAge(12);
         u.setSex(1);
         System.out.println(object2Json(u));*/

         /*User us = json2Ojbect(object2Json(u), User.class);
         System.out.println(us);
         */

         /*List<User> list = new ArrayList<User>();
         User u = new User();
         u.setName("wxw");
         u.setAge(12);
         u.setSex(1);
         list.add(u);
         u = new User();
         u.setName("zmx");
         u.setAge(12);
         u.setSex(0);
         list.add(u);
         u = new User();
         u.setName("arnold");
         u.setAge(12);
         u.setSex(1);
         list.add(u);
         String str = list2Json(list);
         System.out.println(str);*/

         /*List<User> userList = converAnswerFormString(str, User.class);
         System.out.println(userList);
         */

     }
 }