json封装数据

今天在网上搜了一下封装json数据，自己也验证了一下 ，感觉还行 就直接搬过来了，不够还有部分小代码是自己封装的。

package com.json;import java.io.IOException;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 javax.servlet.http.HttpServletResponse;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.commons.beanutils.BeanUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;public class JSONUtils{/*** * @author wangwei JSON工具类* @param <T>* *//**** 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<Map<String,Object>>* @param object* @return*/// 返回非实体类型(Map<String,Object>)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 <T>* @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 <T>* @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 <T>* @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 <T>* @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 <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 = 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 <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 = 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 <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*/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;}/*** 封装json数据从后台传输* @param obj*/public static void outPutJson(Object obj){ActionContext context = ActionContext.getContext();HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);try {response.getWriter().print(obj);} catch (IOException e) {e.printStackTrace();}}}//测试类String s1 = "[{id:1, pId:0, name:\"test1\" , open:true}]"; String s2 = "{id:2, pId:1, name:\"test211\" , open:true}"; String s3 = "{id:3, pId:2, name:\"test311\" , open:true}"; String s4 = "{id:4, pId:1, name:\"test411\" , open:true}";List<String> listZtree = new ArrayList<String>();listZtree.add(s1);listZtree.add(s2);listZtree.add(s3);listZtree.add(s4);System.out.println(JSONUtils.toJSONString(listZtree));}