将Object对象转成 json串

/**
 * 解析多层次Json字符串,封装多层Json，避免字符串中有特殊字符而出现的错误 
 * @author wangcccong 
 * @version 1.140122
 * create at： Fri, 13 Jun 2014
 * update at: Mon, 1 Sep 2014
 */
public class JsonUtil {
 
    private final static String regex = "\"([^\\\" ]+?)\":";
 
    /**
     * 一个方法解析多层json数据  json + 正则 + 递归
     * @see {@link java.util.regex.Matcher}, {@link java.util.regex.Pattern}
     * @param jsonStr
     * @return {@link java.util.Map} or {@link java.util.List} or {@link java.lang.String}
     */
    public static Object jsonParse(final String jsonStr) {
        if (jsonStr == null) throw new NullPointerException("JsonString shouldn't be null");
        try {
            if (isJsonObject(jsonStr)) {
                final Pattern pattern = Pattern.compile(regex);
                final Matcher matcher = pattern.matcher(jsonStr);
                final Map<String, Object> map = new HashMap<String, Object>();
                final JSONObject jsonObject = new JSONObject(jsonStr);
                try {
                    for (; matcher.find(); ) {
                        String groupName = matcher.group(1);
                        Object obj = jsonObject.opt(groupName);
                        //Log.e(groupName, obj+"");
                        if (isJsonObject(obj+"") || isJsonArray(obj+"")) {
                            matcher.region(matcher.end() + (obj+"").replace("\\", "").length(), matcher.regionEnd());
                            map.put(groupName, jsonParse(obj+""));
                        } else {
                            map.put(groupName, obj+"");
                        }
                    }
                } catch (Exception e) {
                    // TODO: handle exception
                    Log.e("object---error", e.getMessage()+"--"+e.getLocalizedMessage());
                }
                 
                return map;
            } else if (isJsonArray(jsonStr)) {
                List<Object> list = new ArrayList<Object>();
                try {
                    JSONArray jsonArray = new JSONArray(jsonStr);
                    for (int i = 0; i < jsonArray.length(); i++) {
                        Object object = jsonArray.opt(i);
                        list.add(jsonParse(object+""));
                    }
                } catch (Exception e) {
                    // TODO: handle exception
                    Log.e("array---error", e.getMessage()+"--"+e.getLocalizedMessage());
                }
                return list;
            } 
        } catch (Exception e) {
            // TODO: handle exception
            Log.e("RegexUtil--regexJson", e.getMessage()+"");
        }
        return jsonStr;
    }
     
    /**
     * To determine whether a string is JsonObject {@link org.json.JSONObject}
     * @param jsonStr {@link java.lang.String}
     * @return boolean
     */
    private static boolean isJsonObject(final String jsonStr) {
        if (jsonStr == null) return false;
        return Pattern.matches("^\\{.*\\}$", jsonStr.trim());
    }
     
    /**
     * To determine whether a string is JsonArray {@link org.json.JSONArray};
     * @param jsonStr {@link java.lang.String}
     * @return boolean
     */
    private static boolean isJsonArray(final String jsonStr) {
        if (jsonStr == null) return false;
        return Pattern.matches("^\\[.*\\]$", jsonStr.trim());
    }
     
    /**
     * 将对象分装为json字符串 (json + 递归)
     * @param obj 参数应为{@link java.util.Map} 或者 {@link java.util.List}
     * @return
     */
    @SuppressWarnings("unchecked")
    public static Object jsonEnclose(Object obj) {
        try {
            if (obj instanceof Map) {   //如果是Map则转换为JsonObject
                Map<String, Object> map = (Map<String, Object>)obj;
                Iterator<Entry<String, Object>> iterator = map.entrySet().iterator();
                JSONStringer jsonStringer = new JSONStringer().object();
                while (iterator.hasNext()) {
                    Entry<String, Object> entry = iterator.next();
                    jsonStringer.key(entry.getKey()).value(jsonEnclose(entry.getValue()));
                }
                JSONObject jsonObject = new JSONObject(new JSONTokener(jsonStringer.endObject().toString()));
                return jsonObject;
            } else if (obj instanceof List) {  //如果是List则转换为JsonArray
                List<Object> list = (List<Object>)obj;
                JSONStringer jsonStringer = new JSONStringer().array();
                for (int i = 0; i < list.size(); i++) {
                    jsonStringer.value(jsonEnclose(list.get(i)));
                }
                JSONArray jsonArray = new JSONArray(new JSONTokener(jsonStringer.endArray().toString()));
                return jsonArray;
            } else {
                return obj;
            }
        } catch (Exception e) {
            // TODO: handle exception
            LogUtil.e("jsonUtil--Enclose", e.getMessage());
            return e.getMessage();
        }
    }
     
}
 
 
//解析时使用示例
Object object = JsonUtil.jsonParse(RegexPolicy.Json, jsonStr.substring(jsonStr.indexOf("{"), 
                                    jsonStr.lastIndexOf("}")+1));
                            if (object instanceof String) {
                                Log.e("string", object.toString());
                            } else if (object instanceof Map) {
                                @SuppressWarnings("unchecked")
                                HashMap<String, Object> map = (HashMap<String, Object>)object;
                                Iterator<Entry<String, Object>>  iterator = map.entrySet().iterator();
                                while (iterator.hasNext()) {
                                    Entry<String, Object> entry = iterator.next();
                                    if (entry.getValue() instanceof List) {
                                        Log.e(entry.getKey(), entry.getValue().toString());
                                    } else {
                                        Log.e(entry.getKey(), entry.getValue().toString());
                                    }
                                }
                            } else if (object instanceof List) {
                                Log.e("list", object.toString());
                            }
 
//封装时使用示例
Map<String, Object> map = new HashMap<String, Object>();
        map.put("returnCode", "0");
        map.put("returnMsg", "成功");
        List<Map<String, Object>> list = new ArrayList<Map<String,Object>>(); 
        Map<String, Object> listMap = new HashMap<String, Object>();
        listMap.put("test", "测试");
        listMap.put("fuck", "fuck");
        list.add(listMap);
        list.add(listMap);
        map.put("returnStatus", list);
        LogUtil.e("fuck", JsonUtil.jsonEnclose(map).toString()+"---");
//封装时结果
{"returnCode":"0","returnStatus":[{"test":"测试","fuck":"fuck"},{"test":"测试","fuck":"fuck"}],"returnMsg":"成功"}---