java解析json转Map
大家好，又见面了，我是你们的朋友全栈君。
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}] */
}
}发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/148305.html原文链接：https://javaforall.cn
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