最近项目中需要在android中将对象转为json字串以及反序列化为对象，查阅了android sdk文档后，发现android中没有类似C#里DataContractJsonSerializer的类，想想需求也不算复杂，就自己写了两个方法解决，代码如下：
public static String getJson(Object objSource){ try{ Object object = getJsonObject(objSource); if(object == null) return ""; return ((JSONObject)object).toString(); } catch(Exception err){ Log.e(TAG, "getJson exception:"+err.getMessage()); return ""; } } private static Object getJsonObject(Object objSource) throws Exception{ if(objSource != null){ Class<?> objClass = objSource.getClass(); if(objClass.getPackage().getName().startsWith(PackageString)){ JSONObject jsonObject = new JSONObject(); Field[] publicFields = objClass.getFields(); Object val; for(Field field : publicFields){ val = field.get(objSource); if(val != null){ Class<?> valClass = val.getClass(); if(valClass.isArray()){ JSONArray array = new JSONArray(); int length = Array.getLength(val); for( int i = 0; i<length; i++){ array.put(getJsonObject(Array.get(val, i))); } jsonObject.put(field.getName(), array); } else if(valClass.equals(ArrayList. class)){ ArrayList<?> aList = ArrayList. class.cast(val); Iterator<?> iterator = aList.iterator(); JSONArray array = new JSONArray(); while (iterator.hasNext()) { array.put(getJsonObject(iterator.next())); } jsonObject.put(field.getName(), array); } else{ jsonObject.put(field.getName(),getJsonObject(val)); } } else{ jsonObject.put(field.getName(), null); } } return jsonObject; } else{ return objSource; } } return null; } public static Object parseJson(Class<?> targetClass,String jsonString){ try{ Object object = targetClass.newInstance(); JSONObject jsonObject = new JSONObject(jsonString); String key; Class<?> fieldClass; Object element; Class<?> elementType; Field[] fields = targetClass.getFields(); for(Field field : fields){ key = field.getName(); fieldClass = field.getType(); if(fieldClass.equals(ArrayList. class)){ String genericType = field.getGenericType().toString(); if(genericType.indexOf("<") > 0){ genericType = genericType.substring(genericType.indexOf("<")+1,genericType.lastIndexOf(">")); } ArrayList<Object> aList = new ArrayList<Object>(); JSONArray array = jsonObject.getJSONArray(key); int length = array.length(); if(genericType.startsWith(PackageString)){ elementType = Class.forName(genericType); Field[] elementFields = elementType.getFields(); JSONObject subJsonObject; for( int i=0;i<length;i++){ element = elementType.newInstance(); subJsonObject = array.getJSONObject(i); for(Field subField : elementFields){ subField.set(element, subJsonObject.get(subField.getName())); } aList.add(element); } } else{ for( int i=0;i<length;i++){ aList.add(array.get(i)); } } field.set(object, aList); } else if(fieldClass.isArray()){ JSONArray array = jsonObject.getJSONArray(key); int length = array.length(); String arrayTypeName = fieldClass.getComponentType().getName(); Object[] objArray = new Object[length]; if(arrayTypeName.startsWith(PackageString)){ elementType = Class.forName(arrayTypeName); Field[] elementFields = elementType.getFields(); JSONObject subJsonObject; for( int i=0;i<length;i++){ element = elementType.newInstance(); subJsonObject = array.getJSONObject(i); for(Field subField : elementFields){ subField.set(element, subJsonObject.get(subField.getName())); } objArray[i] = element; } } else{ for( int i=0;i<length;i++){ objArray[i] = array.get(i); } } field.set(object, objArray); } else{ field.set(object, jsonObject.get(key)); } } return object; } catch(Exception err){ Log.e(TAG, "parseJson exception:"+err.getMessage()); return null; } }
支持基本类型、数组、ArrayList成员组成的类