package cn.ksource.core.util;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Map;
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import org.apache.commons.lang.StringUtils;
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import net.sf.json.JSONArray;
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import net.sf.json.JSONObject;
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import net.sf.json.util.JSONUtils;
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public class JsonUtil {
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/**
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* 将JSON格式的字符串转化为Map对象，只进行第一层次的转换
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* @param json
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* @return
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* 作者：杨凯
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*/
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public static Map<String,String> json2SimpleMap(String json){
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JSONObject object = JSONObject.fromObject(json);
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Map map = new HashMap();
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Iterator it = object.keys();
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while (it.hasNext()) {
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String key = (String)it.next();
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map.put(key, ConvertUtil.obj2Str(object.get(key)));
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}
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return map;
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}
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/**
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* 将JSON格式的字符串转化为Map对象，进行所有层次的转换
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* @param json
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* @return
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* 作者：杨凯
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*/
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public static Map<String, Object> json2Map(String json){
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if(StringUtil.isEmpty(json)){
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return null;
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}
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JSONObject object = JSONObject.fromObject(json);
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Map map = new HashMap();
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Iterator it = object.keys();
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while (it.hasNext()) {
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String key = (String)it.next();
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String value = object.getString(key);
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//如果为Map结构
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if (JSONUtils.isObject(object.get(key))) {
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map.put(key, json2Map(value));
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//如果为List结构
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} else if (JSONUtils.isArray(object.get(key))) {
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List<Map> list = new ArrayList<Map>();
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JSONArray jArray = JSONArray.fromObject(value);
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for (int i = 0; i < jArray.size(); i++) {
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list.add(json2Map(jArray.getString(i)));
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}
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map.put(key, list);
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} else {
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map.put(key, ConvertUtil.obj2Str(object.get(key)));
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}
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}
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return map;
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}
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/**
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* 将JSON格式的字符串转化为List对象，进行所有层次的转换
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* @param json
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* @return
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* 作者：杨凯
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*/
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public static List<Map> json2List(String json){
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if (StringUtils.isBlank(json)) {
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return new ArrayList<Map>();
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}
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JSONArray jArray = JSONArray.fromObject(json);
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List<Map> list = new LinkedList<Map>();
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for (int i = 0; i < jArray.size(); i++) {
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list.add(json2Map(jArray.getString(i)));
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}
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return list;
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}
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/**
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* 将JSON格式的字符串转化为List对象，只进行第一层次的转换
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* @param json
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* @return
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* 作者：杨凯
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*/
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public static List<Map> json2SimpleList(String json){
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JSONArray jArray = JSONArray.fromObject(json);
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List<Map> list = new LinkedList<Map>();
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for (int i = 0; i < jArray.size(); i++) {
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list.add(json2SimpleMap(jArray.getString(i)));
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}
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return list;
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}
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public static String map2Json(Map map){
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JSONObject jsonObject = new JSONObject();
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jsonObject.putAll(map == null || map.isEmpty() ? new HashMap() : map);
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return jsonObject.toString();
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}
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public static String list2Json(List list){
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JSONArray jsonArray = JSONArray.fromObject(list == null || list.isEmpty() ? new ArrayList() : list);
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return jsonArray.toString();
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}
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/**
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* 功能描述：将对象转换为JSON格式的字符串<BR>
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* @param obj
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* @return
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* @author:杨凯<BR>
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* 时间：May 22, 2009 12:18:26 PM<BR>
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*/
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public static String obj2Json(Object obj) {
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JSONArray jsonArray = JSONArray.fromObject(obj);
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return jsonArray.toString();
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}
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public static String obj2JsonObj(Object obj) {
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JSONObject jsonArray = JSONObject.fromObject(obj);
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return jsonArray.toString();
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}
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public static void main(String[] args) {
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Map map = new HashMap();
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map.put("name", "yangkai");
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map.put("age", 20);
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List<Map> list = new ArrayList<Map>();
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Map tempMap = new HashMap();
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tempMap.put("key1", "value1");
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tempMap.put("key2", "value2");
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Map tempMap1 = new HashMap();
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tempMap1.put("key3", "value3");
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tempMap1.put("key4", "value4");
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list.add(tempMap);
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list.add(tempMap1);
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map.put("list", list);
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String json = JsonUtil.map2Json(map);
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System.out.println(json);
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// json2List(list2Json(list));
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}
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}
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