java解析json转Map
来源：互联网 发布：linux yum jdk 1.8 编辑：程序博客网 时间：2024/05/21 15:39
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JsonObject Map<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JsonArray List<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 exception return 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])+"");//listNode 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])+"");//listNode resultList.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}] */ }}阅读全文
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