JSON操作工具类

JSON操作工具类：

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.Date;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Set;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.commons.beanutils.BeanUtils;public class JSONUtils {/** * 将List对象序列化为JSON文本 *  * @param <T> * @param list * @return */public static <T> String toJSONString(List<T> list) {JSONArray js = JSONArray.fromObject(list);return js.toString();}/** * 将对象序列化为JSON文本 *  * @param obj * @return */public static String toJSONString(Object object) {JSONObject jo = JSONObject.fromObject(object);return jo.toString();}/*** * 将JSON对象数组序列化为JSON文本 *  * @param ja * @return */public static String toJSONString(JSONArray ja) {return ja.toString();}/** * 将JSON对象序列化为JSON文本 *  * @param jo * @return */public static String toJSONString(JSONObject jo) {return jo.toString();}/** * 将对象转换为List对象 *  * @param object * @return */@SuppressWarnings({ "rawtypes", "unchecked" })public static List toArrayList(Object object) {List arrList = new ArrayList();JSONArray ja = JSONArray.fromObject(object);Iterator<?> iterator = ja.iterator();while (iterator.hasNext()) {JSONObject jo = (JSONObject) iterator.next();Iterator<?> keys = jo.keys();while (keys.hasNext()) {Object key = keys.next();Object value = jo.get(key);arrList.add(value);}}return arrList;}/** * 将对象转换为Collection对象 *  * @param object * @return */@SuppressWarnings("rawtypes")public static Collection toCollection(Object object) {JSONArray ja = JSONArray.fromObject(object);return JSONArray.toCollection(ja);}/** * 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);}public static void main(String[] args) {System.out.println(toJSONObject(new Date()));}/** * 将一个json数组转换成list对象 *  * @param jsonStr * @return */@SuppressWarnings("unchecked")public static List<Map<String, Object>> json2List(String jsonStr) {JSONArray ja = JSONArray.fromObject(jsonStr);List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> it = ja.iterator();while (it.hasNext()) {JSONObject json2 = it.next();list.add(json2Map(json2));}return list;}/** * 将一个json数组转换成list对象 *  * @param jsonStr * @return */@SuppressWarnings("unchecked")public static List<Map<String, Object>> json2List(JSONArray ja) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> it = ja.iterator();while (it.hasNext()) {JSONObject json2 = it.next();list.add(json2Map(json2));}return list;}/** * 将一个json对象转换成Map对象 *  * @param jsonStr * @return */@SuppressWarnings("unchecked")public static Map<String, Object> json2Map(String jsonStr) {Map<String, Object> map = new HashMap<String, Object>();JSONObject jo = JSONObject.fromObject(jsonStr);for (Object key : jo.keySet()) {Object value = jo.get(key);if (value instanceof JSONArray) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> iterator = ((JSONArray) value).iterator();while (iterator.hasNext()) {JSONObject jo2 = iterator.next();list.add(json2Map(jo2.toString()));}map.put(key.toString(), value);} else {map.put(key.toString(), value);}}return map;}/** * 将一个json对象转换成Map对象 *  * @param jo * @return */@SuppressWarnings("unchecked")public static Map<String, Object> json2Map(JSONObject jo) {Map<String, Object> map = new HashMap<String, Object>();for (Object key : jo.keySet()) {Object value = jo.get(key);if (value instanceof JSONArray) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();Iterator<JSONObject> iterator = ((JSONArray) value).iterator();while (iterator.hasNext()) {JSONObject jo2 = iterator.next();list.add(json2Map(jo2.toString()));}map.put(key.toString(), value);} else {map.put(key.toString(), value);}}return map;}public static String map2Json(Map<Object, Object> map){ if (null == map) {return null;}JSONObject jo = JSONObject.fromObject(map);return jo.toString();}/** * //通过HTTP url获取JSON数据 *  * @return */public static List<Map<String, Object>> getListByUrl(String url) {StringBuilder builder = null;try {InputStream in = new URL(url).openStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));builder = new StringBuilder();String line = "";while ((line = reader.readLine()) != null) {builder.append(line);}} catch (Exception e) {e.printStackTrace();}return json2List(builder.toString());}/** * //通过HTTP url获取JSON数据 *  * @return */public static Map<String, Object> getMapByUrl(String url) {StringBuilder builder = null;try {InputStream in = new URL(url).openStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));String line = "";builder = new StringBuilder();while ((line = reader.readLine()) != null) {builder.append(line);}} catch (Exception e) {e.printStackTrace();}return json2Map(builder.toString());}/** * 将对象转换为HashMap *  * @param object * @return */@SuppressWarnings("rawtypes")public static HashMap toHashMap(Object object) {HashMap<String, Object> map = new HashMap<String, Object>();JSONObject jo = JSONUtils.toJSONObject(object);Iterator iterator = jo.keys();while (iterator.hasNext()) {Object obj = iterator.next();String key = "";if (obj instanceof String) {key = (String) obj;}Object value = jo.get(key);map.put(key, value);}return map;}/** * 将对象转换为List<Map<String,Object>> 返回非实体类型(Map<String,Object>)的List *  * @return */@SuppressWarnings("rawtypes")public static List<Map<String, Object>> toList(Object object) {List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();JSONArray ja = JSONArray.fromObject(object);for (Object obj : ja) {if (obj instanceof JSONObject) {JSONObject jo = (JSONObject) obj;Map<String, Object> map = new HashMap<String, Object>();Iterator iterator = jo.keys();while (iterator.hasNext()) {Object o = iterator.next();String key = "";if (o instanceof String) {key = (String) o;}Object value = jo.get(key);map.put(key, value);}list.add(map);}}return list;}/** * 将JSON对象数组转换为传入类型的List *  * @param <T> * @param ja * @param clazz * @return */@SuppressWarnings({ "unchecked", "deprecation" })public static <T> List<T> toList(JSONArray ja, Class<T> clazz) {return JSONArray.toList(ja, clazz);}/** * 将对象转换为传入类型的List *  * @param <T> * @param object * @param clazz * @return */@SuppressWarnings({ "unchecked", "deprecation" })public static <T> List<T> toList(Object object, Class<T> clazz) {JSONArray ja = JSONArray.fromObject(object);return JSONArray.toList(ja, clazz);}/** * 将JSON对象转换为传入类型的对象 *  * @param <T> * @param jo * @param clazz * @return */@SuppressWarnings({ "static-access", "unchecked" })public static <T> T toBean(JSONObject jo, Class<T> clazz) {return (T) jo.toBean(jo, clazz);}/** * 将将对象转换为传入类型的对象 *  * @param <T> * @param object * @param clazz * @return */@SuppressWarnings({ "static-access", "unchecked" })public static <T> T toBean(Object object, Class<T> clazz) {JSONObject jo = JSONObject.fromObject(object);return (T) jo.toBean(jo, clazz);}/*** * 将JSON文本反序列化为主从关系的实体 *  * @param <T> *            泛型T 代表主实体类型 * @param <D> *            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 */@SuppressWarnings("unused")public static <T, D> T toBean(String jsonString, Class<T> mainClass,String detailName, Class<D> detailClass) {JSONObject jo = JSONObject.fromObject(jsonString);JSONArray ja = (JSONArray) jo.get(detailName);T mainEntity = JSONUtils.toBean(jo, mainClass);List<D> detailList = JSONUtils.toList(ja, detailClass);try {BeanUtils.setProperty(mainEntity, detailName, detailClass);} catch (Exception e) {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 <T>>泛型T 代表主实体类型 * @param <D1>泛型D1 代表从实体类型 * @param <D2>泛型D2 代表从实体类型 * @param jsonStringJSON文本 * @param maiinClass *            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 */@SuppressWarnings("unused")public static <T, D1, D2> T toBean(String jsonString, Class<T> maiinClass,String detailName1, Class<D1> detailClass1, String detailName2,Class<D2> detailClass2) {JSONObject jo = JSONObject.fromObject(jsonString);JSONArray ja1 = (JSONArray) jo.get(detailName1);JSONArray ja2 = (JSONArray) jo.get(detailName2);T mainEntity = JSONUtils.toBean(jo, maiinClass);List<D1> detailList1 = JSONUtils.toList(ja1, detailClass1);List<D2> detailList2 = JSONUtils.toList(ja2, detailClass2);try {BeanUtils.setProperty(mainEntity, detailName1, detailClass1);BeanUtils.setProperty(mainEntity, detailName2, detailClass2);} catch (Exception e) {e.printStackTrace();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 <T>泛型T 代表主实体类型 * @param <D1>泛型D1 代表从实体类型 * @param <D2>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 <T> *            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 */@SuppressWarnings("rawtypes")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;}}

JSON操作工具类：