强大的Java Json工具类

Json解析所需jar包：http://download.csdn.net/detail/u014676619/9238793

工具类：

import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.net.URL;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.commons.beanutils.BeanUtils;public class JSONUtils {/** *  * @author wangwei JSON工具类 * @param *  *//*** * 将List对象序列化为JSON文本 */public static <T> String toJSONString(List<T> list) {JSONArray jsonArray = JSONArray.fromObject(list);return jsonArray.toString();}/*** * 将对象序列化为JSON文本 *  * @param object * @return */public static String toJSONString(Object object) {JSONArray jsonArray = JSONArray.fromObject(object);return jsonArray.toString();}/*** * 将JSON对象数组序列化为JSON文本 *  * @param jsonArray * @return */public static String toJSONString(JSONArray jsonArray) {return jsonArray.toString();}/*** * 将JSON对象序列化为JSON文本 *  * @param jsonObject * @return */public static String toJSONString(JSONObject jsonObject) {return jsonObject.toString();}/*** * 将对象转换为List对象 *  * @param object * @return */public static List toArrayList(Object object) {List arrayList = new ArrayList();JSONArray jsonArray = JSONArray.fromObject(object);Iterator it = jsonArray.iterator();while (it.hasNext()) {JSONObject jsonObject = (JSONObject) it.next();Iterator keys = jsonObject.keys();while (keys.hasNext()) {Object key = keys.next();Object value = jsonObject.get(key);arrayList.add(value);}}return arrayList;}/*** * 将对象转换为Collection对象 *  * @param object * @return */public static Collection toCollection(Object object) {JSONArray jsonArray = JSONArray.fromObject(object);return JSONArray.toCollection(jsonArray);}/*** * 将对象转换为JSON对象数组 *  * @param object * @return */public static JSONArray toJSONArray(Object object) {return JSONArray.fromObject(object);}/*** * 将对象转换为JSON对象 *  * @param object * @return */public static JSONObject toJSONObject(Object object) {return JSONObject.fromObject(object);}/*** * 将对象转换为HashMap *  * @param object * @return */public static HashMap toHashMap(Object object) {HashMap<String, Object> data = new HashMap<String, Object>();JSONObject jsonObject = JSONUtils.toJSONObject(object);Iterator it = jsonObject.keys();while (it.hasNext()) {String key = String.valueOf(it.next());Object value = jsonObject.get(key);data.put(key, value);}return data;}/*** * 将对象转换为List> *  * @param object * @return */// 返回非实体类型(Map)的Listpublic static List<Map<String, Object>> toList(Object object) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();JSONArray jsonArray = JSONArray.fromObject(object);for (Object obj : jsonArray) {JSONObject jsonObject = (JSONObject) obj;Map<String, Object> map = new HashMap<String, Object>();Iterator it = jsonObject.keys();while (it.hasNext()) {String key = (String) it.next();Object value = jsonObject.get(key);map.put((String) key, value);}list.add(map);}return list;}/*** * 将JSON对象数组转换为传入类型的List *  * @param * @param jsonArray * @param objectClass * @return */public static <T> List<T> toList(JSONArray jsonArray, Class<T> objectClass) {return JSONArray.toList(jsonArray, objectClass);}/*** * 将对象转换为传入类型的List *  * @param * @param jsonArray * @param objectClass * @return */public static <T> List<T> toList(Object object, Class<T> objectClass) {JSONArray jsonArray = JSONArray.fromObject(object);return JSONArray.toList(jsonArray, objectClass);}/*** * 将JSON对象转换为传入类型的对象 *  * @param * @param jsonObject * @param beanClass * @return */public static <T> T toBean(JSONObject jsonObject, Class<T> beanClass) {return (T) JSONObject.toBean(jsonObject, beanClass);}/*** * 将将对象转换为传入类型的对象 *  * @param * @param object * @param beanClass * @return */public static <T> T toBean(Object object, Class<T> beanClass) {JSONObject jsonObject = JSONObject.fromObject(object);return (T) JSONObject.toBean(jsonObject, beanClass);}/*** * 将JSON文本反序列化为主从关系的实体 *  * @param 泛型T *            代表主实体类型 * @param 泛型D *            代表从实体类型 * @param jsonString *            JSON文本 * @param mainClass *            主实体类型 * @param detailName *            从实体类在主实体类中的属性名称 * @param detailClass *            从实体类型 * @return */public static <T, D> T toBean(String jsonString, Class<T> mainClass,String detailName, Class<D> detailClass) {JSONObject jsonObject = JSONObject.fromObject(jsonString);JSONArray jsonArray = (JSONArray) jsonObject.get(detailName);T mainEntity = JSONUtils.toBean(jsonObject, mainClass);List<D> detailList = JSONUtils.toList(jsonArray, detailClass);try {BeanUtils.setProperty(mainEntity, detailName, detailList);} catch (Exception ex) {throw new RuntimeException("主从关系JSON反序列化实体失败！");}return mainEntity;}/*** * 将JSON文本反序列化为主从关系的实体 *  * @param 泛型T *            代表主实体类型 * @param 泛型D1 *            代表从实体类型 * @param 泛型D2 *            代表从实体类型 * @param jsonString *            JSON文本 * @param mainClass *            主实体类型 * @param detailName1 *            从实体类在主实体类中的属性 * @param detailClass1 *            从实体类型 * @param detailName2 *            从实体类在主实体类中的属性 * @param detailClass2 *            从实体类型 * @return */public static <T, D1, D2> T toBean(String jsonString, Class<T> mainClass,String detailName1, Class<D1> detailClass1, String detailName2,Class<D2> detailClass2) {JSONObject jsonObject = JSONObject.fromObject(jsonString);JSONArray jsonArray1 = (JSONArray) jsonObject.get(detailName1);JSONArray jsonArray2 = (JSONArray) jsonObject.get(detailName2);T mainEntity = JSONUtils.toBean(jsonObject, mainClass);List<D1> detailList1 = JSONUtils.toList(jsonArray1, detailClass1);List<D2> detailList2 = JSONUtils.toList(jsonArray2, detailClass2);try {BeanUtils.setProperty(mainEntity, detailName1, detailList1);BeanUtils.setProperty(mainEntity, detailName2, detailList2);} catch (Exception ex) {throw new RuntimeException("主从关系JSON反序列化实体失败！");}return mainEntity;}/*** * 将JSON文本反序列化为主从关系的实体 *  * @param 泛型T *            代表主实体类型 * @param 泛型D1 *            代表从实体类型 * @param 泛型D2 *            代表从实体类型 * @param jsonString *            JSON文本 * @param mainClass *            主实体类型 * @param detailName1 *            从实体类在主实体类中的属性 * @param detailClass1 *            从实体类型 * @param detailName2 *            从实体类在主实体类中的属性 * @param detailClass2 *            从实体类型 * @param detailName3 *            从实体类在主实体类中的属性 * @param detailClass3 *            从实体类型 * @return */public static <T, D1, D2, D3> T toBean(String jsonString,Class<T> mainClass, String detailName1, Class<D1> detailClass1,String detailName2, Class<D2> detailClass2, String detailName3,Class<D3> detailClass3) {JSONObject jsonObject = JSONObject.fromObject(jsonString);JSONArray jsonArray1 = (JSONArray) jsonObject.get(detailName1);JSONArray jsonArray2 = (JSONArray) jsonObject.get(detailName2);JSONArray jsonArray3 = (JSONArray) jsonObject.get(detailName3);T mainEntity = JSONUtils.toBean(jsonObject, mainClass);List<D1> detailList1 = JSONUtils.toList(jsonArray1, detailClass1);List<D2> detailList2 = JSONUtils.toList(jsonArray2, detailClass2);List<D3> detailList3 = JSONUtils.toList(jsonArray3, detailClass3);try {BeanUtils.setProperty(mainEntity, detailName1, detailList1);BeanUtils.setProperty(mainEntity, detailName2, detailList2);BeanUtils.setProperty(mainEntity, detailName3, detailList3);} catch (Exception ex) {throw new RuntimeException("主从关系JSON反序列化实体失败！");}return mainEntity;}/*** * 将JSON文本反序列化为主从关系的实体 *  * @param 主实体类型 * @param jsonString *            JSON文本 * @param mainClass *            主实体类型 * @param detailClass *            存放了多个从实体在主实体中属性名称和类型 * @return */public static <T> T toBean(String jsonString, Class<T> mainClass,HashMap<String, Class> detailClass) {JSONObject jsonObject = JSONObject.fromObject(jsonString);T mainEntity = JSONUtils.toBean(jsonObject, mainClass);for (Object key : detailClass.keySet()) {try {Class value = (Class) detailClass.get(key);BeanUtils.setProperty(mainEntity, key.toString(), value);} catch (Exception ex) {throw new RuntimeException("主从关系JSON反序列化实体失败！");}}return mainEntity;}/** * jsonStr转List *  * @param jsonStr * @return */public static List<Map<String, Object>> parseJSON2List(String jsonStr) {JSONArray jsonArr = JSONArray.fromObject(jsonStr);List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> it = jsonArr.iterator();while (it.hasNext()) {JSONObject json2 = it.next();list.add(parseJSON2Map(json2.toString()));}return list;}/** * jsonStr转Map *  * @param jsonStr * @return */public static Map<String, Object> parseJSON2Map(String jsonStr) {Map<String, Object> map = new HashMap<String, Object>();// 最外层解析JSONObject json = JSONObject.fromObject(jsonStr);for (Object k : json.keySet()) {Object v = json.get(k);// 如果内层还是数组的话，继续解析if (v instanceof JSONArray) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> it = ((JSONArray) v).iterator();while (it.hasNext()) {JSONObject json2 = it.next();list.add(parseJSON2Map(json2.toString()));}map.put(k.toString(), list);} else {map.put(k.toString(), v);}}return map;}/** * url转List *  * @param url * @return */public static List<Map<String, Object>> getListByUrl(String url) {try {// 通过HTTP获取JSON数据InputStream in = new URL(url).openStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));StringBuilder sb = new StringBuilder();String line;while ((line = reader.readLine()) != null) {sb.append(line);}return parseJSON2List(sb.toString());} catch (Exception e) {e.printStackTrace();}return null;}/** * url转Map *  * @param url * @return */public static Map<String, Object> getMapByUrl(String url) {try {// 通过HTTP获取JSON数据InputStream in = new URL(url).openStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));StringBuilder sb = new StringBuilder();String line;while ((line = reader.readLine()) != null) {sb.append(line);}return parseJSON2Map(sb.toString());} catch (Exception e) {e.printStackTrace();}return null;}}