[android开发] json格式 与javaBean, HashMap格式之间的转换, 网络请求时常用.

这个是自己写的方法, 可能有点杂乱.

public class ConvertUtil {/** * 把非空属性拷贝到新对象 *  * @param from * @param to */public static void copyProperties(Object from, Object to) {try {Class<? extends Object> clazz = from.getClass();Field[] fields = clazz.getDeclaredFields();Object fromV;Object toV;// 遍历字段for (Field field : fields) {try {field.setAccessible(true);fromV = field.get(from);toV = field.get(to);if (toV instanceof String) {if (!TextUtils.isEmpty((String) fromV)) {field.set(to, fromV);}} else if (toV instanceof ArrayList) {ArrayList fromArr = (ArrayList) fromV;if (fromArr != null && fromArr.size() > 0) {field.set(to, fromArr);}} else {if (fromV != null) {field.set(to, fromV);}}} catch (Exception e) {e.printStackTrace();}}} catch (Exception e) {}}/** * json装为bean *  * @param json * @param clazz * @return */public static <T> T json2Bean(JSONObject json, Class<T> clazz) {T obj = null;try {obj = newInstance(clazz);doJson2Bean(json, obj);return obj;} catch (Exception e) {e.printStackTrace();return obj;}}/** * beanlist转为mapList *  * @param beanList * @return */public static <T> ArrayList<HashMap<String, Object>> beanList2mapList(ArrayList<T> beanList) {ArrayList<HashMap<String, Object>> mapList = new ArrayList<HashMap<String, Object>>();HashMap<String, Object> map;if (beanList != null) {for (T bean : beanList) {map = new HashMap<String, Object>();try {Field[] fields = bean.getClass().getDeclaredFields();Object value;// 遍历字段for (Field field : fields) {try {field.setAccessible(true);value = field.get(bean);if (value != null)map.put(field.getName(), value);} catch (Exception e) {e.printStackTrace();}}} catch (Exception e) {e.printStackTrace();}mapList.add(map);}}return mapList;}/** * beanlist转为array *  * @param beanList * @return */public static <T> JSONArray beanList2array(ArrayList<T> beanList, ArrayList<String> maskNames) {JSONArray array = new JSONArray();JSONObject obj = new JSONObject();if (beanList != null) {for (T bean : beanList) {obj = new JSONObject();try {Field[] fields = bean.getClass().getDeclaredFields();Object value;// 遍历字段for (Field field : fields) {try {field.setAccessible(true);value = field.get(bean);// 屏蔽字段if (value != null && maskNames != null && !maskNames.contains(field.getName()))obj.put(field.getName(), value);} catch (Exception e) {e.printStackTrace();}}} catch (Exception e) {e.printStackTrace();}array.put(obj);}}return array;}/** * json数组转为beanList *  * @param array * @param clazz * @return */public static <T> ArrayList<T> array2BeanList(JSONArray array, Class<T> clazz) {ArrayList<T> list = new ArrayList();int len = array.length();try {// 遍历数组for (int i = 0; i < len; i++) {Object obj = newInstance(clazz);list.add((T) obj);doJson2Bean(array.getJSONObject(i), obj);}} catch (Exception e) {}return list;}/** * json数组转为mapList *  * @param array * @return */public static <T> ArrayList<HashMap<String, Object>> array2MapList(JSONArray array) {ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();int len = array.length();HashMap<String, Object> map;try {// 遍历数组for (int i = 0; i < len; i++) {map = new HashMap<String, Object>();list.add(map);doJson2Map(array.getJSONObject(i), map);}} catch (Exception e) {}return list;}// /////////////////////////////////////////////////////////////////** * 递归 *  * @param json * @param map */private static void doJson2Map(JSONObject json, HashMap<String, Object> map) {try {// 所有的keyIterator it = json.keys();Field field;// 遍历keywhile (it.hasNext()) {// keyString key = (String) it.next();// json valueObject value = json.get(key);try {if (value instanceof JSONObject) {HashMap<String, Object> m = new HashMap<String, Object>();map.put(key, m);doJson2Map((JSONObject) value, m);} else if (value instanceof JSONArray) {JSONArray array = (JSONArray) value;ArrayList<HashMap<String, Object>> list = new ArrayList<HashMap<String, Object>>();map.put(key, list);// 泛型信息int len = array.length();// 遍历数组for (int i = 0; i < len; i++) {HashMap<String, Object> m = new HashMap<String, Object>();list.add(m);doJson2Map(array.getJSONObject(i), m);}} else {map.put(key, value);}} catch (Exception e) {}}} catch (Exception e) {e.printStackTrace();}}private static <T> ArrayList<T> array2Bean(JSONArray array, Class<T> clazz, ArrayList list) {int len = array.length();try {// 遍历数组for (int i = 0; i < len; i++) {Object obj = newInstance(clazz);list.add((T) obj);doJson2Bean(array.getJSONObject(i), obj);}} catch (Exception e) {}return list;}private static <T> T newInstance(Class<T> clazz) {try {Constructor constructor = clazz.getDeclaredConstructors()[0];constructor.setAccessible(true);constructor.setAccessible(true);T obj = (T) constructor.newInstance();return obj;} catch (Exception e) {e.printStackTrace();return null;}}private static void doJson2Bean(JSONObject json, Object entity) {try {// 所有的keyIterator it = json.keys();Class clazz = entity.getClass();Field field;// 遍历keywhile (it.hasNext()) {// keyString key = (String) it.next();// json valueObject value = json.get(key);try {field = clazz.getDeclaredField(key);field.setAccessible(true);if (value instanceof JSONObject) {Object obj = field.get(entity);doJson2Bean((JSONObject) value, obj);} else if (value instanceof JSONArray) {JSONArray array = (JSONArray) value;List list = (List) field.get(entity);// 泛型信息Class genClazz = getSuperClassGenricType(field, 0);int len = array.length();// 遍历数组for (int i = 0; i < len; i++) {Object o = array.get(i);if (o instanceof JSONObject) {Object obj = newInstance(genClazz);list.add(obj);doJson2Bean(array.getJSONObject(i), obj);} else {String str = o.toString();if (genClazz.equals(Double.class)) {list.add(Double.parseDouble(str));} else if (genClazz.equals(Integer.class)) {list.add(Integer.parseInt(str));} else if (genClazz.equals(Long.class)) {list.add(Long.parseLong(str));} else if (genClazz.equals(Float.class)) {list.add(Float.parseFloat(str));} else if (genClazz.equals(Boolean.class)) {list.add(Boolean.parseBoolean(str));} else if (genClazz.equals(String.class)) {list.add(str);}}}} else {try2SetField(field, entity, value);}} catch (Exception e) {System.out.println(e);}}} catch (Exception e) {e.printStackTrace();}}private static void try2SetField(Field field, Object entity, Object value) {// Class genClazz = entity.getClass();try {String str = value.toString();if ("null".equals(str))return;Class genClazz = (Class) field.getGenericType();if (genClazz.equals(Double.class)) {field.set(entity, Double.parseDouble(str));} else if (genClazz.equals(Integer.class)) {field.set(entity, Integer.parseInt(str));} else if (genClazz.equals(Long.class)) {field.set(entity, Long.parseLong(str));} else if (genClazz.equals(Float.class)) {field.set(entity, Float.parseFloat(str));} else if (genClazz.equals(Boolean.class)) {field.set(entity, Boolean.parseBoolean(str));} else if (genClazz.equals(String.class)) {field.set(entity, str);}} catch (Exception e) {}}public static RequestParams bean2Params(Object bean) {RequestParams params = new RequestParams();addParams(bean, params, "");return params;}private static void addParams(Object entity, RequestParams params, String prefix) {try {Field[] fields = entity.getClass().getDeclaredFields();Object value;// 遍历字段for (Field field : fields) {try {field.setAccessible(true);value = field.get(entity);// 不为空if (value != null) {// 是基本类型if ((value instanceof Number) || (value instanceof Boolean) || (value instanceof String)) {params.add(prefix + field.getName(), value.toString());} else {addParams(value, params, prefix + field.getName() + ".");}}} catch (Exception e) {e.printStackTrace();}}} catch (Exception e) {e.printStackTrace();}}/* * 获取泛型信息 */@SuppressWarnings("unchecked")private static Class<Object> getSuperClassGenricType(Field field, int index) {ParameterizedType pt = (ParameterizedType) field.getGenericType();return (Class<Object>) pt.getActualTypeArguments()[index];}@SuppressWarnings("unchecked")public static Class<Object> getSuperClassGenricType(final Class clazz, final int index) {// 返回表示此 Class 所表示的实体（类、接口、基本类型或 void）的直接超类的 Type。Type genType = clazz.getGenericSuperclass();if (!(genType instanceof ParameterizedType)) {return Object.class;}// 返回表示此类型实际类型参数的 Type 对象的数组。Type[] params = ((ParameterizedType) genType).getActualTypeArguments();if (index >= params.length || index < 0) {return Object.class;}if (!(params[index] instanceof Class)) {return Object.class;}return (Class) params[index];}}