JSON常用格式大处理
总结了日常开发中对Json格式的处理，需要下载json相关Jar；这里提供下主要Jar
json-lib-2.2.3-jdk13.jar

import net.sf.json.JSON;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import net.sf.json.xml.XMLSerializer;/** * Json串处理工具类 * json,list,map等之间的各种转化 * @author * @version 2.0 create at,2009-2-12 *  */public class JsonUtil {/** * 将json格式的字符串转化为jsonobject * @param str * @return * @throws ApplicationException  */public static JSONObject stringToJsonObject(String str) throws ApplicationException {JSONObject jsonObject = null;if (Validator.isNotNull(str)) {try{jsonObject = JSONObject.fromObject(str);}catch(Exception ex){throw new ApplicationException("要转化的字符串格式不对，必须为json格式！");}}return jsonObject;}/** * 从指定的List<map>对象中获取要设置的值后组装成返回给前台的JSON对象字符串. * 主要用于给前台分页grid组装数据 * @param list    list<map>从数据库中查询出来的数据 * @param count   总数 * @return */@SuppressWarnings("unchecked")public static String fromMap(List list, int count) {//将list<map>转化为jsonarrayJSONArray options = formListArray(list);JSONObject result = new JSONObject();result.put("result", options);result.put("totalCount", count);return result.toString();}/** * 将Map<String,String>转化为JSONObject格式的字符串 * @param map * @return {"success":true,"result":{}} */public static String fromMapToJson(Map<String, String> map) {Iterator<String> it = map.keySet().iterator();JSONObject jsonObject = new JSONObject();JSONObject json = new JSONObject();while (it.hasNext()) {String key = (String) it.next();jsonObject.put(key.toLowerCase(), map.get(key));}json.put("success", true);json.put("result", jsonObject.toString());return json.toString();}/** * 将list<map>转化为jsonobject格式的字符串 * @param list * @return {"result":{...}} */@SuppressWarnings("unchecked")public static String fromListMap(List list) {JSONArray options = new JSONArray();for (Object obj : list) {Iterator it = ((Map) obj).keySet().iterator();Object value;JSONObject option = new JSONObject();while (it.hasNext()) {String key = (String) it.next();value = ((Map) obj).get(key);value = value != null ? value : "";option.put(key.toLowerCase(), value);}options.add(option);}JSONObject result = new JSONObject();result.put("result", options.toString());return result.toString();}/** * 从list<map>转化为treenode的json * @param list * @return */@SuppressWarnings("unchecked")public static String toAsynTreeJson(List list) {JSONArray ja = new JSONArray();for (Object obj : list) {Iterator it = ((Map) obj).keySet().iterator();JSONObject option = new JSONObject();while (it.hasNext()) {String key = (String) it.next();Object value = ((Map) obj).get(key);key = key.toLowerCase();value = value == null ? "" : value.toString();//是否含有带checkbox的treenodeif (key.equals("checked")) {boolean check = value.equals("1") ? true : false;option.put("checked", check);}//是为叶子节点还是为非叶子节点else if("leaf".equals(key)){boolean leaf = value.toString().trim().equals("1")?true:false;option.put("leaf", leaf);}else if("draggable".equals(key)){boolean draggable = value.toString().trim().equals("1")?true:false;option.put("draggable", draggable);}elseoption.put(key, value);}ja.add(option);}return ja.toString();}/** * 将list<map>转化为jsonarray * 此JSONArray的格式将会是这样[{},{}] * @param list  * @return */@SuppressWarnings("unchecked")public static JSONArray formListArray(List list) {JSONArray options = new JSONArray();for (Object obj : list) {Iterator it = ((Map) obj).keySet().iterator();JSONObject option = new JSONObject();while (it.hasNext()) {String key = (String) it.next();Object value = ((Map) obj).get(key);value = value != null ? value : "";option.put(key.toLowerCase(), value);}options.add(option);}return options;}/** * 从List<Model>转化成jsonArray * list中装的对象为具体的po * @param list * @return */@SuppressWarnings("unchecked")public static JSONArray formListModelArray(List list){JSONArray options = new JSONArray();for (Object obj : list) {options.add(obj);}return options;}/** * 将JSONArray逆向转化为List  list中可以为任何元素， * @param json  符合JSONArray格式的字符串 * 可以是很复杂的格式，如[{},[],{a:[],b:{},c:{cc:[]...}},'test'] * @return */@SuppressWarnings("unchecked")public static List JSONArrayConvertList(String json) {ArrayList list = new ArrayList();JSONArray ja = JSONArray.fromObject(json);populateArray(ja, list);return list;}@SuppressWarnings("unchecked")private static void populateArray(JSONArray jsonArray, List list) {//循环遍历jsonarrayfor (int i = 0; i < jsonArray.size(); i++) {if (jsonArray.get(i).getClass().equals(JSONArray.class)) {  //如果元素是JSONArray类型ArrayList _list = new ArrayList();list.add(_list);//递归遍历，此为深度遍历，先把最内层的jsonobject给遍历了populateArray(jsonArray.getJSONArray(i), _list);} else if (jsonArray.get(i).getClass().equals(JSONObject.class)) {  //如果是JSONObject类型HashMap _map = new HashMap();list.add(_map);//遍历JSONObjectpopulate(jsonArray.getJSONObject(i), _map);} else {  //如果都不是的话就直接加入到list中list.add(jsonArray.get(i));}}}@SuppressWarnings("unchecked")private static Map populate(JSONObject jsonObject, Map map) {for (Iterator iterator = jsonObject.entrySet().iterator(); iterator.hasNext();) {String entryStr = String.valueOf(iterator.next());String key = entryStr.substring(0, entryStr.indexOf("="));if (jsonObject.get(key).getClass().equals(JSONObject.class)) {HashMap _map = new HashMap();map.put(key, _map);populate(jsonObject.getJSONObject(key), _map);} else if (jsonObject.get(key).getClass().equals(JSONArray.class)) {ArrayList list = new ArrayList();map.put(key, list);populateArray(jsonObject.getJSONArray(key), list);} else {map.put(key, jsonObject.get(key));}}return map;}/** * Map转换成JSONObject * @param map * @return */@SuppressWarnings("unchecked")public JSONObject populateToJsonObject(Map map) {    JSONObject temp = new JSONObject();    Iterator iter = map.entrySet().iterator();    while (iter.hasNext()) {      Entry entry = (Entry) iter.next();      String key = entry.getKey().toString();      String value = entry.getValue() == null ? "" : entry.getValue().toString();      temp.put(key, value);    }    return temp;  }/***将json转化为xml**/  public static String jsonToXml(JSON json,Boolean appendHint){XMLSerializer xmlSerializer = new XMLSerializer();xmlSerializer.setTypeHintsEnabled(appendHint);xmlSerializer.setRootName("root");return xmlSerializer.write(json);}/***将xml转化为json**/public static JSON xmlToJson(String xml){XMLSerializer xmlSerializer = new XMLSerializer();JSON json = xmlSerializer.read(xml);return json;}}