java解析json转Map

前段时间在做json报文处理的时候，写了一个针对不同格式json转map的处理工具方法，总结记录如下：

1、单节点单层级、单节点多层级json转map

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONStringer;
import org.json.JSONTokener;/*** 功能：* 1、将单/多层级的Json字符串解析为Map格式* 2、将Map格式的数据封装成Json* * 避免字符串中有特殊字符而出现的错误 * @author lmb * @version 1.0* @date 2017-06-01*/
public class JSONUtils {private final static String regex = "\"([^\\\" ]+?)\":";/*** 一个方法解析多层json数据  json + 正则 + 递归* @param jsonStr* @return */public static Object jsonParse(final String jsonStr) {if (jsonStr == null) throw new NullPointerException("JsonString shouldn't be null");try {if (isJsonObject(jsonStr)) {final Pattern pattern = Pattern.compile(regex);final Matcher matcher = pattern.matcher(jsonStr);final Map<String, Object> map = new HashMap<String, Object>();final JSONObject jsonObject = new JSONObject(jsonStr);
//                System.out.println("jsonStr = " + jsonStr);
//                System.out.println("jsonObject = " + jsonObject);try {for (; matcher.find(); ) {String groupName = matcher.group(1);Object obj = jsonObject.opt(groupName);if (isJsonObject(obj+"") || isJsonArray(obj+"")) {matcher.region(matcher.end() + (obj+"").replace("\\", "").length(), matcher.regionEnd());map.put(groupName, jsonParse(obj+""));} else {map.put(groupName, obj+"");}}} catch (Exception e) {// TODO: handle exception}return map;} else if (isJsonArray(jsonStr)) {List<Object> list = new ArrayList<Object>();try {JSONArray jsonArray = new JSONArray(jsonStr);for (int i = 0; i < jsonArray.length(); i++) {Object object = jsonArray.opt(i);list.add(jsonParse(object+""));}} catch (Exception e) {// TODO: handle exception}return list;} } catch (Exception e) {// TODO: handle exception}return jsonStr;}/*** To determine whether a string is JsonObject {@link org.json.JSONObject}* @param jsonStr {@link java.lang.String}* @return boolean*/private static boolean isJsonObject(final String jsonStr) {if (jsonStr == null) return false;return Pattern.matches("^\\{.*\\}$", jsonStr.trim());}/*** To determine whether a string is JsonArray {@link org.json.JSONArray};* @param jsonStr {@link java.lang.String}* @return boolean*/private static boolean isJsonArray(final String jsonStr) {if (jsonStr == null) return false;return Pattern.matches("^\\[.*\\]$", jsonStr.trim());}/*** 将对象封装为json字符串 (json + 递归)* @param obj 参数应为{@link java.util.Map} 或者 {@link java.util.List}* @return*/@SuppressWarnings("unchecked")public static Object jsonEnclose(Object obj) {try {if (obj instanceof Map) {   //如果是Map则转换为JsonObjectMap<String, Object> map = (Map<String, Object>)obj;Iterator<Entry<String, Object>> iterator = map.entrySet().iterator();JSONStringer jsonStringer = (JSONStringer) new JSONStringer().object();while (iterator.hasNext()) {Entry<String, Object> entry = iterator.next();jsonStringer.key(entry.getKey()).value(jsonEnclose(entry.getValue()));}JSONObject jsonObject = new JSONObject(new JSONTokener(jsonStringer.endObject().toString()));return jsonObject;} else if (obj instanceof List) {  //如果是List则转换为JsonArrayList<Object> list = (List<Object>)obj;JSONStringer jsonStringer = (JSONStringer) new JSONStringer().array();for (int i = 0; i < list.size(); i++) {jsonStringer.value(jsonEnclose(list.get(i)));}JSONArray jsonArray = new JSONArray(new JSONTokener(jsonStringer.endArray().toString()));return jsonArray;} else {return obj;}} catch (Exception e) {// TODO: handle exceptionreturn e.getMessage();}}@SuppressWarnings("unchecked")public static void main(String[] args) {/** 解析时使用示例*/String jsonStr1 = "{\"ContractRoot\":{" +"               \"tcpCont\":{" +"                   \"ActionCode\":\"1\"," +"                   \"Response\":{" +"                       \"RspCode\":\"9002\"," +"                       \"RspDesc\":\"TransactionID超出长度约束\"," +"                       \"RspType\":\"9\"" +"                   }," +"                   \"RspTime\":\"20170527144416\"," +"                   \"TransactionID\":\"74201705281800202798\"" +"               }" +"           }" +"       }";String jsonStr2 = "{\"ContractRoot\":\"9002\"," +"           \"RspDesc\":\"TransactionID超出长度约束\"," +"           \"RspType\":\"9\"," +"           \"RspTime\":\"20170527144416\"," +"           \"TransactionID\":\"74201705281800202798\"" +"           }";Object object = jsonParse(jsonStr1);System.out.println(object);Map resultMap = new HashMap();boolean flag = true;while(flag){flag = false;if (object instanceof String) {System.out.println("string　= " + object.toString());} else if (object instanceof Map) {HashMap<String, Object> map = (HashMap<String, Object>)object;Iterator<Entry<String, Object>>  iterator = map.entrySet().iterator();while (iterator.hasNext()) {Entry<String, Object> entry = iterator.next();if (entry.getValue() instanceof Map) {object = entry.getValue();flag = true;} else {resultMap.put(entry.getKey(),entry.getValue().toString());}}} else if (object instanceof List) {//list未测试System.out.println("list = " + object.toString());}}System.out.println("resultMap : " + resultMap);/*** resultMap : {TransactionID=74201705281800202798, RspType=9, RspCode=9002, ActionCode=1, RspTime=20170527144416, RspDesc=TransactionID超出长度约束}* resultMap : {TransactionID=74201705281800202798, RspType=9, RspTime=20170527144416, RspDesc=TransactionID超出长度约束, ContractRoot=9002}*//** 封装时使用示例*/Map<String, Object> map = new HashMap<String, Object>();map.put("returnCode", "0");map.put("returnMsg", "成功");List<Map<String, Object>> list = new ArrayList<Map<String,Object>>(); Map<String, Object> listMap = new HashMap<String, Object>();listMap.put("test", "测试");listMap.put("fucp", "fucp");list.add(listMap);list.add(listMap);map.put("returnStatus", list);System.out.println("map : " + map);System.out.println("json : " + jsonEnclose(map).toString());/** 封装结果* map : {returnCode=0, returnMsg=成功, returnStatus=[{test=测试, fucp=fucp}, {test=测试, fucp=fucp}]}* json : {"returnCode":"0","returnMsg":"成功","returnStatus":[{"test":"测试","fucp":"fucp"},{"test":"测试","fucp":"fucp"}]}       */}}

2、多结点多层级json转map

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.simpleproxy.dataparse.json.JsonUtil;/*** 功能：通过属性文件处理JSON报文* @author lmb * @version 1.0* @date 2017-6-5*/
public class ParseJSONByPropertyFile {/*** 根据json报文和结点全路径获取相应的节点值* @param respStr json报文* @param nodePath 要获取的字段在json中的节点全路径（用">"分割）* @return*/@SuppressWarnings("unchecked")public static List<Map<String,Object>> json2MapbyHandler(String respStr,String nodePath){List<Map<String,Object>> resultList = new ArrayList<Map<String,Object>>();Map map = JsonUtil.parseJSON2Map(respStr);String[] strArray = nodePath.split(">");String key = null;Object value = null;for (int i = 0; i < strArray.length; i++) {if (map.get(strArray[i]) instanceof List) {if (i < strArray.length - 1 && null != map.get(strArray[i]) && "" != map.get(strArray[i])) {Map<String,Object> mapList = map;if (((List<Map<String,Object>>)mapList.get(strArray[i])).size() > 0) {for (int j = 0; j < ((List<Map<String,Object>>)mapList.get(strArray[i])).size(); j++) {Map<String,Object> mapj = new HashMap<String,Object>();map = ((List<Map<String,Object>>)mapList.get(strArray[i])).get(j);mapj.put(strArray[i+1],map.get(strArray[i + 1]));resultList.add(mapj);}}}break;}else{if (i < strArray.length - 1 && null != map.get(strArray[i]) && "" != map.get(strArray[i])) {map = JsonUtil.parseJSON2Map(map.get(strArray[i]).toString());}else{Map<String,Object> resultMap = new HashMap<String,Object>();resultMap.put(strArray[i],map.get(strArray[i]));resultList.add(resultMap);}}}return resultList;      }/*** 根据json报文和结点获取相应的值* @param respStr json报文* @param listNode 要获取的字段在json中的节点路径（用">"分割）* @return*/@SuppressWarnings({ "unchecked", "rawtypes" })public static List<Map<String,Object>> json2ListbyHandler(String respStr,String listNode){List<Map<String,Object>> resultList = new ArrayList<Map<String,Object>>();Double d = new Double("0.0000");Map map = JsonUtil.parseJSON2Map(respStr);String[] strArray = listNode.split(">");String key = null;Object value = null;for (int i = 0; i < strArray.length; i++) {if (map.get(strArray[i]) instanceof List) {if (i < strArray.length - 1 && null != map.get(strArray[i]) && "" != map.get(strArray[i])) {Map<String,Object> mapList = map;if (((List<Map<String,Object>>)mapList.get(strArray[i])).size() > 0) {for (int j = 0; j < ((List<Map<String,Object>>)mapList.get(strArray[i])).size(); j++) {Map mapj = new HashMap();map = ((List<Map<String,Object>>)mapList.get(strArray[i])).get(j);mapj.put(strArray[i+1],map.get(strArray[i + 1])+"");//listNoderesultList.add(mapj);}}}break;}else{if (i < strArray.length - 1 && null != map.get(strArray[i]) && "" != map.get(strArray[i])) {map = JsonUtil.parseJSON2Map(map.get(strArray[i]).toString());}else{Map<String,Object> resultMap = new HashMap<String,Object>();resultMap.put(strArray[i],map.get(strArray[i])+"");//listNoderesultList.add(resultMap);}}}System.out.println(resultList);return resultList;      }/*** 根据节点的list集合将json报文组装成多包体list* @param nodeList* @param respXml* @return*/public static List<Map<String,Object>> str2ListbyHandler(List<String> nodeList,String respStr){Map<String,Object> resultMap = new HashMap<String,Object>();List<Map<String,Object>> resultList = new ArrayList<Map<String,Object>>();Map<String,Object> commonMap = new HashMap<String,Object>();int flag = 0;if (null != nodeList && nodeList.size() > 0) {for(String field : nodeList){List<Map<String,Object>> thirdList = new ArrayList<Map<String,Object>>();thirdList = json2ListbyHandler(respStr,field);if (thirdList.size() > 0) {if (thirdList.size() < 2) {//公共参数commonMap.putAll(thirdList.get(0));}else{//某节点下为list集合if (flag == 0) {resultList = thirdList;}for (int i = 0; i < thirdList.size(); i++) {resultList.get(i).putAll(thirdList.get(i));}flag++;}}}}if (resultList.size() == 0) {resultList.add(commonMap);}else{for (int i = 0; i < resultList.size(); i++) {resultList.get(i).putAll(commonMap);}}System.out.println("resultList >> " + resultList);return resultList;}public static void main(String[] args) {String str = "{\"ROOT\":{" +"       \"HEADER\":{" +"           \"ROUTING\":{" +"               \"ROUTE_KEY\":\"qqq\"," +"               \"ROUTE_VALUE\":\"ccc\"" +"           }," +"           \"DB_ID\":\"USA\"," +"           \"ENV_ID\":\"bbb\"," +"           \"KEEP_LIVE\":\"yes\"," +"           \"PROVINCE_GROUP\":\"\"," +"           \"POOL_ID\":\"11\"," +"           \"TENANT_ID\":\"USA\"," +"           \"LANG\":\"en_US\"" +"       }," +"       \"BODY\":{" +"           \"RETURN_CODE\":\"10111109000000003\"," +"           \"RETURN_MSG\":\"Failed to get user info!\"," +"           \"USER_MSG\":\"取用户信息错误!\"," +"           \"DETAIL_MSG\":\"error\"," +"           \"PROMPT_MSG\":\"取用户信息错误!\"," +"           \"RUN_IP\":\"192.168.50.112\"," +"           \"OUT_DATA\":{" +"               \"FREE_INFO\"= [" +"                   {\"BUSI_CODE\"= \"EUR_CUEasy ￡ 36(UK-CHINA)\"," +"                       \"FAV_TYPE\"= \"ECH0\"," +"                       \"PRIORITY\"= \"0\"," +"                       \"PROD_PRCID\"= \"10000000017607\"," +"                       \"PROD_PRC_NAME\"= \"CUEasy ￡ 36(UK-CHINA)\"," +"                       \"TOTAL\"= \"2000\"," +"                       \"UNIT\"= \"3\"," +"                       \"UNIT_NAME\"= \"Minute\"," +"                       \"USED\"= \"0\"" +"                   }," +"                   {\"BUSI_CODE\"= \"USA_CUEasy ￡ 36(UK-CHINA)\"," +"                       \"FAV_TYPE\"= \"ECH0\"," +"                       \"PRIORITY\"= \"0\"," +"                       \"PROD_PRCID\"= \"10000000017607\"," +"                       \"PROD_PRC_NAME\"= \"CUEasy ￡ 36(UK-CHINA)\"," +"                       \"TOTAL\"= \"1000\"," +"                       \"UNIT\"= \"1\"," +"                       \"UNIT_NAME\"= \"piece\"," +"                       \"USED\"= \"0\"" +"                   }" +"               ]" +"           }" +"       }" +"     }" +"   }" +"}";System.out.println("********从json中将单个节点的值查找出来*********************");String nodePath = "ROOT>BODY>OUT_DATA>FREE_INFO>BUSI_CODE";System.out.println(json2MapbyHandler(str,nodePath));/** [{BUSI_CODE=EUR_CUEasy ￡ 36(UK-CHINA)}, {BUSI_CODE=USA_CUEasy ￡ 36(UK-CHINA)}]*/System.out.println("***************从json中将节点集合中的所有节点值都查找出来***********************");List<String> nodeList = new ArrayList<String>();nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>FAV_TYPE");nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>PRIORITY");nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>PROD_PRCID");nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>PROD_PRC_NAME");nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>TOTAL");nodeList.add("ROOT>BODY>OUT_DATA>FREE_INFO>UNIT");str2ListbyHandler(nodeList,str);/** [{FAV_TYPE=ECH0, UNIT=3, PROD_PRC_NAME=CUEasy ￡ 36(UK-CHINA), PRIORITY=0, TOTAL=2000, PROD_PRCID=10000000017607}, * {FAV_TYPE=ECH0, UNIT=1, PROD_PRC_NAME=CUEasy ￡ 36(UK-CHINA), PRIORITY=0, TOTAL=1000, PROD_PRCID=10000000017607}]*/}
}

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1、单节点单层级、单节点多层级json转map

2、多结点多层级json转map

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