Android、java解析json工具类

一个非常好用的解析json工具类，使用方法：

JsonUtil json = JsonUtil.newJsonUtil(jsonString);
json.getInt("code");

json.getString("message");

package com.xxxx;import java.lang.reflect.Field;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;/*** @File:JsonUtil.java* @Package:com.asiainfo.utils* @desc:json解析工具类* @author:zhuzuofei* @date:2015-1-23 上午9:37:53* @version:V1.0*/public class JsonUtil {private static final String TAG = "jsonUtil";private JSONObject jsonObject;private JsonUtil(String json) {LogUtil.e(TAG, "json=" + json);jsonObject = getJsonObject(json);if (jsonObject == null) {LogUtil.e(TAG, "jsonobject is null");}}private JsonUtil() {super();}public static JsonUtil newJsonUtil(String json) {JsonUtil util = new JsonUtil(json);return util;}/*** get json object** @param json*            json data* @return JOSNObject*/public JSONObject getJsonObject(String json) {JSONObject jsonObject = null;try {jsonObject = new JSONObject(json);} catch (JSONException e) {LogUtil.e(TAG, "create jsonobject exception");e.printStackTrace();}return jsonObject;}/*** get String data** @param json*            json data* @param key*            param* @return String data* @throws JSONException*/public String getString(String key) throws JSONException {if (jsonObject != null) {return jsonObject.getString(key);} else {return null;}}/*** get String data** @param json*            json data* @param key*            param* @return int data* @throws JSONException*/public int getInt(String key) throws JSONException {if (jsonObject != null) {return jsonObject.getInt(key);} else {return -1;}}/*** get Double data** @param json*            json data* @param key*            param* @return double data* @throws JSONException*/public double getDouble(String key) throws JSONException {if (jsonObject != null) {return jsonObject.getDouble(key);} else {return -1;}}/*** This Method use in jsonObject get current class with object** @param jsonObject* @param c*            class* @return object* @throws Exception*/public Object getObject(Class<?> c) throws Exception {if (jsonObject != null) {return getObject(c.getSimpleName().toLowerCase(), c);} else {return null;}}/*** This Method use in jsonObject get current class with object** @param jsonObject* @param key*            query key* @param c*            class* @return object* @throws Exception*/public Object getObject(String key, Class<?> c) throws Exception {if (jsonObject != null) {return getObject(jsonObject, key, c);} else {return null;}}public Object getObject(JSONObject jsonObject, Class<?> c) throws Exception {return getObject(jsonObject, c.getSimpleName().toLowerCase(), c);}/*** This Method use in jsonObject get current class with object** @param jsonObject* @param key*            query key* @param c*            class* @return object* @throws Exception*/public static Object getObject(JSONObject jsonObject, String key, Class<?> c) throws Exception {//Log.e(TAG, "key ==  " + key);Object bean = null;if (jsonObject != null) {JSONObject jo = null;if (key != null) {jo = jsonObject.getJSONObject(key);} else {jo = jsonObject;}if (jo != null) {if (c.equals(null)) {LogUtil.e(TAG, "class is null");bean = jo.get(key);} else {bean = c.newInstance();Field[] fs = c.getDeclaredFields();for (int i = 0; i < fs.length; i++) {Field f = fs[i];f.setAccessible(true);Type type = f.getGenericType();String value;try {value = jo.getString(f.getName());} catch (Exception e) {value = "";}if (type.equals(int.class)) {f.setInt(bean, Integer.valueOf(value));} else if (type.equals(double.class)) {f.setDouble(bean, Double.valueOf(value));} else {f.set(bean, value);}}}} else {LogUtil.e(TAG, "in jsonobject not key ");}} else {LogUtil.e(TAG, "current param jsonobject is null");}return bean;}/*** This method use in jsonObject get list object** @param key*            list key* @param objectKey*            object key* @param c*            object* @return list* @throws Exception*/public ArrayList<Object> getList(String key, Class<?> c) throws Exception {ArrayList<Object> list = null;try {if (jsonObject != null) {JSONArray jsonArray = jsonObject.getJSONArray(key);if (!jsonArray.isNull(0)) {list = new ArrayList<Object>();for (int i = 0; i < jsonArray.length(); i++) {Object object = null;if (c == String.class) {String stringObject = jsonArray.getString(i);list.add(stringObject);} else {JSONObject jsObject = jsonArray.getJSONObject(i);object = getObject(jsObject, null, c);list.add(object);}}}}} catch (Exception e) {e.printStackTrace();return null;}return list;}public ArrayList<?> getSpecTypeList(String key, Class<?> c) throws Exception {ArrayList<Object> list = null;try {if (jsonObject != null) {JSONArray jsonArray = jsonObject.getJSONArray(key);if (!jsonArray.isNull(0)) {list = new ArrayList<Object>();for (int i = 0; i < jsonArray.length(); i++) {Object object = null;if (c == String.class) {String stringObject = jsonArray.getString(i);list.add(stringObject);} else {JSONObject jsObject = jsonArray.getJSONObject(i);object = getObject(jsObject, null, c);list.add(object);}}}}} catch (Exception e) {e.printStackTrace();return null;}return list;}public Map<Object, Object> getMap() {HashMap<Object, Object> map = new HashMap<Object, Object>();Iterator keyIter = jsonObject.keys();Object key = null;Object value = null;while (keyIter.hasNext()) {key = keyIter.next();try {value = jsonObject.get((String) key);} catch (JSONException e) {e.printStackTrace();}map.put(key, value);}return map;}public Map<String, String> getStringMap() {HashMap<String, String> map = new HashMap<String, String>();Iterator keyIter = jsonObject.keys();Object key = null;Object value = null;while (keyIter.hasNext()) {key = keyIter.next();try {value = jsonObject.get((String) key);} catch (JSONException e) {e.printStackTrace();}map.put((String)key, (String)value);}return map;}/*** Test class field value** @param c* @param classObject* @throws IllegalArgumentException* @throws IllegalAccessException*/public static String getFieldValue(Class<?> c, Object classObject) throws IllegalArgumentException, IllegalAccessException {StringBuffer sb = new StringBuffer();Field[] fs = c.getFields();for (int i = 0; i < fs.length; i++) {String s = fs[i].getName() + "=" + fs[i].get(classObject);sb.append(s).append("\n");}// Log.e(TAG, sb.toString());return sb.toString();}@SuppressWarnings({ "deprecation", "unused", "unchecked" })public static Object fromJSONObject2Object(JSONObject json, Class pojo) throws Exception {// 首先得到pojo所定义的字段Field[] fields = pojo.getDeclaredFields();// 根据传入的Class动态生成pojo对象Object obj = pojo.newInstance();for (Field field : fields) {// 设置字段可访问（必须，否则报错）field.setAccessible(true);// 得到字段的属性名String name = field.getName();// 这一段的作用是如果字段在JSONObject中不存在会抛出异常，如果出异常，则跳过。try {json.get(name);} catch (Exception ex) {continue;}if (json.get(name) != null && !"".equals(json.getString(name))) {// 根据字段的类型将值转化为相应的类型，并设置到生成的对象中。if (field.getType().equals(Long.class) || field.getType().equals(long.4000class)) {field.set(obj, Long.parseLong(json.getString(name)));} else if (field.getType().equals(String.class)) {field.set(obj, json.getString(name));} else if (field.getType().equals(Double.class) || field.getType().equals(double.class)) {field.set(obj, Double.parseDouble(json.getString(name)));} else if (field.getType().equals(Integer.class) || field.getType().equals(int.class)) {field.set(obj, Integer.parseInt(json.getString(name)));} else if (field.getType().equals(java.util.Date.class)) {field.set(obj, Date.parse(json.getString(name)));} else {continue;}}}return obj;}public static ArrayList<Object> jsonArray2List(JSONArray jsonArray, Class<?> c) throws Exception {ArrayList<Object> list = null;try {if (!jsonArray.isNull(0)) {list = new ArrayList<Object>();for (int i = 0; i < jsonArray.length(); i++) {Object object = null;if (c == String.class) {String stringObject = jsonArray.getString(i);list.add(stringObject);} else {JSONObject jsObject = jsonArray.getJSONObject(i);object = getObject(jsObject, null, c);list.add(object);}}}} catch (Exception e) {e.printStackTrace();return null;}return list;}}