JSONHelper

package org.jeecgframework.core.util;import java.io.IOException;import java.util.ArrayList;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;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import com.fasterxml.jackson.core.JsonParseException;import com.fasterxml.jackson.databind.JsonMappingException;import com.fasterxml.jackson.databind.ObjectMapper;/** * JSON和JAVA的POJO的相互转换 *  * JSONHelper.java */public final class JSONHelper {private static final Logger logger = LoggerFactory.getLogger(JSONHelper.class);// 将数组转换成JSONpublic static String array2json(Object object) {JSONArray jsonArray = JSONArray.fromObject(object);return jsonArray.toString();}// 将JSON转换成数组,其中valueClz为数组中存放的对象的Class@SuppressWarnings("rawtypes")public static Object json2Array(String json, Class valueClz) {JSONArray jsonArray = JSONArray.fromObject(json);return JSONArray.toArray(jsonArray, valueClz);}// 将Collection转换成JSONpublic static String collection2json(Object object) {JSONArray jsonArray = JSONArray.fromObject(object);return jsonArray.toString();}// 将Map转换成JSONpublic static String map2json(Object object) {JSONObject jsonObject = JSONObject.fromObject(object);return jsonObject.toString();}// 将JSON转换成Map,其中valueClz为Map中value的Class,keyArray为Map的key@SuppressWarnings({ "rawtypes", "unchecked" })public static Map json2Map(Object[] keyArray, String json, Class valueClz) {JSONObject jsonObject = JSONObject.fromObject(json);Map classMap = new HashMap();for (int i = 0; i < keyArray.length; i++) {classMap.put(keyArray[i], valueClz);}return (Map) JSONObject.toBean(jsonObject, Map.class, classMap);}// 将POJO转换成JSONpublic static String bean2json(Object object) {JSONObject jsonObject = JSONObject.fromObject(object);return jsonObject.toString();}// 将JSON转换成POJO,其中beanClz为POJO的Class@SuppressWarnings("rawtypes")public static Object json2Object(String json, Class beanClz) {return JSONObject.toBean(JSONObject.fromObject(json), beanClz);}/** * json转换为java对象 *  * <pre> * return JackJson.fromJsonToObject(this.answersJson, JackJson.class); * </pre> *  * @param <T> *            要转换的对象 * @param json *            字符串 * @param valueType *            对象的class * @return 返回对象 */public static <T> T fromJsonToObject(String json, Class<T> valueType) {ObjectMapper mapper = new ObjectMapper();try {return mapper.readValue(json, valueType);} catch (JsonParseException e) {logger.error("JsonParseException: ", e);} catch (JsonMappingException e) {logger.error("JsonMappingException: ", e);} catch (IOException e) {logger.error("IOException: ", e);}return null;}// 将String转换成JSONpublic static String string2json(String key, String value) {JSONObject object = new JSONObject();object.put(key, value);return object.toString();}// 将JSON转换成Stringpublic static String json2String(String json, String key) {JSONObject jsonObject = JSONObject.fromObject(json);return jsonObject.get(key).toString();}/*** * 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 */@SuppressWarnings({ "rawtypes", "unchecked" })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 */@SuppressWarnings("rawtypes")public static HashMap toHashMap(Object object) {HashMap<String, Object> data = new HashMap<String, Object>();JSONObject jsonObject = JSONHelper.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<Map<String,Object>> *  * @param object * @return */// 返回非实体类型(Map<String,Object>)的List@SuppressWarnings("rawtypes")public 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 <T> * @param jsonArray * @param objectClass * @return */@SuppressWarnings("unchecked")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 <T> * @param jsonArray * @param objectClass * @return */@SuppressWarnings("unchecked")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 <T> * @param jsonObject * @param beanClass * @return */@SuppressWarnings("unchecked")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 <T> * @param object * @param beanClass * @return */@SuppressWarnings("unchecked")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 <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 */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 = JSONHelper.toBean(jsonObject, mainClass);List<D> detailList = JSONHelper.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 <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 * @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 = JSONHelper.toBean(jsonObject, mainClass);List<D1> detailList1 = JSONHelper.toList(jsonArray1, detailClass1);List<D2> detailList2 = JSONHelper.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 <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 = JSONHelper.toBean(jsonObject, mainClass);List<D1> detailList1 = JSONHelper.toList(jsonArray1, detailClass1);List<D2> detailList2 = JSONHelper.toList(jsonArray2, detailClass2);List<D3> detailList3 = JSONHelper.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 = JSONHelper.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;}@SuppressWarnings("rawtypes")public static String listtojson(String[] fields, int total, List list) throws Exception {Object[] values = new Object[fields.length];String jsonTemp = "{\"total\":" + total + ",\"rows\":[";for (int j = 0; j < list.size(); j++) {jsonTemp = jsonTemp + "{\"state\":\"closed\",";for (int i = 0; i < fields.length; i++) {String fieldName = fields[i].toString();values[i] = org.jeecgframework.tag.core.easyui.TagUtil.fieldNametoValues(fieldName, list.get(j));jsonTemp = jsonTemp + "\"" + fieldName + "\"" + ":\"" + values[i] + "\"";if (i != fields.length - 1) {jsonTemp = jsonTemp + ",";}}if (j != list.size() - 1) {jsonTemp = jsonTemp + "},";} else {jsonTemp = jsonTemp + "}";}}jsonTemp = jsonTemp + "]}";return jsonTemp;}}