Java遍历json字符串取值的实例
java遍历json字符串,取得相应KV值时,各种麻烦,比如将json中的list取出来转为JSONArray,再将list中的object转化为map,再取值(之前的做法),仙子啊通过阿里的fastjson,可以很方便的直接将str转化为JSONArray,再将里面的object强转为JSONObject,然后再通过obj.getInteger(“key”)和obj.getString(“key”)等取值。
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JSONArray json = (JSONArray) JSONArray.parse(str); for (Object obj : json) { JSONObject jo = (JSONObject)obj; int status = jo.getInteger("status"); String message= jo.getString("message"); System.out.println("status---" + status + "---message---" + message); }
1.当json字符串中有数组和map对象,遍历数据,数据格式如下:
[ { "status":0, "tags":[ "check:ntp" ], "timestamp":1492151922.198, "check":"datadog.agent.check_status", "host_name":"song-2", "message":null, "id":2 }, { "status":0, "tags":null, "timestamp":1492151922.2325, "check":"datadog.agent.up", "host_name":"song-2", "message":null, "id":5 } ]
解析上面json字符串数据,如果不使用如fastjson或者Gson时,解析方法如下:
方法一
/** * 主机详情中,异常错误信息的报错的平台服务状态和message * @param str * @return * @throws Exception */ private List
方法二
/** * 主机详情中,异常错误信息的报错的平台服务状态和message * @param str * @return * @throws Exception */ private List> operStr(String str) throws Exception{ List > mList = new ArrayList >();//探针开启的服务名list JSONArray json = (JSONArray) JSONArray.parse(str); Map resMap = null; for (Object obj : json) { JSONObject jo = (JSONObject)obj; int status = jo.getInteger("status"); if(status != 0){ resMap = new HashMap (); switch (status) { case 1: resMap.put("status","WARNING"); break; case 2: resMap.put("status","ERROR"); break; case 3: resMap.put("status","CRIT"); break; default: break; } resMap.put("serviceName", (jo.getString("check")).split("\\.")[0]); resMap.put("msg", jo.getString("message")); mList.add(resMap); } } return mList; }
2.当json字符串中是数组包含数组时候,遍历数据,数据格式如下:
[ [ "haproxy", "haproxy", 0, "ERROR", "swdfghyjuikl", { } ], [ "gearmand", "gearmand", 0, "ERROR", "'Found no valid connections in list: []'", { "version":"[8, 4, 20]" } ] ]
方法一
/** * 通过查询agentChecksStr解析得到异常信息 * @param agentChecksStr * @return */ private List> getExceptInfoFromAgentChecks(String agentChecksStr){ List > mList = new ArrayList >();//探针开启的服务名list //mList 主机详情中,异常错误信息的报错的平台服务状态和message Object jsonArray = JSONArray.parse(agentChecksStr); @SuppressWarnings("unchecked") List > list= (List
>) jsonArray; Map
map = null; for(int i=0;i (); String status = list.get(i).get(3).toString(); if(!status.equals("OK")){ String serviceName = list.get(i).get(0).toString(); String msg = list.get(i).get(4).toString(); map.put("serviceName", serviceName); map.put("status", status); map.put("msg", msg); mList.add(map); } } return mList; }
方法二
/** * 通过查询agentChecksStr解析得到异常信息 * @param agentChecksStr * @return */ private List> getExceptInfoFromAgentChecks(String agentChecksStr){ //探针开启的服务名list List > mList = new ArrayList >(); JSONArray jsonArray = (JSONArray) JSONArray.parse(agentChecksStr); Map map = null; for (Object obj : jsonArray) { map = new HashMap (); JSONArray ja = (JSONArray)obj; String status = ja.getString(3); if(!status.equals("OK")){ String serviceName = ja.getString(0); String msg = ja.getString(4); map.put("serviceName", serviceName); map.put("status", status); map.put("msg", msg); mList.add(map); } } return mList; }
Gson将json字符串转化为json对象:
import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParser; public class MainTest { public static void main(String[] args) throws Exception{ String jsonstr0 = "{\"alarmDetails\":{\"conditionDetails\":{\"alarmId\":7,\"alarmNodataNotifyTime\":1,\"alarmNowSeriesWaitTime\":2},\"conditionStatic\":{\"alarmId\":7,\"conditionAggregate\":\"avg\",\"conditionOperator\":1,\"conditionThresholdTime\":5,\"conditionThresholdValue\":\"123\"},\"metricDetails\":{\"alarmId\":7,\"metricAggregater\":\"avg\",\"metricBy\":\"host\",\"metricExcludeTag\":\"host:paas-177\",\"metricName\":\"system.cpu.user\",\"metricQ\":\"avg:system.cpu.user{#address:wuhan,!host:paas-177}by{host}\",\"metricTag\":\"#address:wuhan\"},\"notify\":[{\"alarmId\":7,\"notifyChannel\":5,\"notifyUserId\":1},{\"alarmId\":7,\"notifyChannel\":5,\"notifyUserId\":2}],\"view\":{\"alarmExpression\":\"avg(last_5m)avg:system.cpu.user{#address:wuhan,!host:paas-177}by{host}>123.0\",\"alarmId\":7,\"alarmLastValue\":\"UP\",\"alarmName\":\"static_metric\",\"alarmStatus\":1,\"alarmType\":2,\"alarmTypeJoin\":3,\"createTime\":\"2017-06-28 17:25:52.0\",\"createUserId\":1,\"isDisable\":false,\"lastAlarmTime\":\"2017-06-28 17:25:27.0\",\"metricName\":\"system.cpu.user\",\"metricTag\":\"#address:wuhan\",\"updateTime\":\"2017-06-29 15:49:18.0\"}},\"alarmId\":7,\"allMark\":{\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\":{\"changePutTime\":true,\"lastPutTsdbTime\":1499655343,\"lastSuccessCheckTime\":1499655349,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tagMap\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"}}},\"joinType\":3,\"useMetricUnit\":\"percent\",\"validataDetails\":{\"status\":0,\"validataMerges\":[{\"alarmMarkDto\":{\"changePutTime\":true,\"lastPutTsdbTime\":1499655343,\"lastSuccessCheckTime\":1499655349,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tagMap\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"}},\"status\":0,\"tag\":\"host:cfeng-4\",\"validataNodata\":{\"currentTime\":1499655349,\"isNodata\":false,\"lastSuccessCheckTime\":1499655349,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tag\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"},\"thresholdTime\":60},\"validataStatic\":{\"converToThresholdValue\":123.0,\"end\":1499655343,\"intervalAggregator\":\"avg\",\"isAlart\":true,\"operator\":1,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"start\":1499655043,\"sysUnit\":\"percent\",\"tag\":{\"#address\":\"wuhan\",\"host\":\"cfeng-4\",\"!host\":\"paas-177\"},\"thresholdTime\":300,\"thresholdValue\":\"123\",\"value\":5.715769243240357}}],\"validataTimeSeconds\":1499655349}}"; String jsonstr1 = "{\"alarmDetails\":{\"conditionDetails\":{\"alarmId\":7,\"alarmNodataNotifyTime\":1,\"alarmNowSeriesWaitTime\":2},\"conditionStatic\":{\"alarmId\":7,\"conditionAggregate\":\"avg\",\"conditionOperator\":1,\"conditionThresholdTime\":5,\"conditionThresholdValue\":\"123\"},\"metricDetails\":{\"alarmId\":7,\"metricAggregater\":\"avg\",\"metricBy\":\"host\",\"metricExcludeTag\":\"host:paas-177\",\"metricName\":\"system.cpu.user\",\"metricQ\":\"avg:system.cpu.user{#address:wuhan,!host:paas-177}by{host}\",\"metricTag\":\"#address:wuhan\"},\"notify\":[{\"alarmId\":7,\"notifyChannel\":5,\"notifyUserId\":1},{\"alarmId\":7,\"notifyChannel\":5,\"notifyUserId\":2}],\"view\":{\"alarmExpression\":\"avg(last_5m)avg:system.cpu.user{#address:wuhan,!host:paas-177}by{host}>123.0\",\"alarmId\":7,\"alarmLastValue\":\"UP\",\"alarmName\":\"static_metric\",\"alarmStatus\":1,\"alarmType\":2,\"alarmTypeJoin\":3,\"createTime\":\"2017-06-28 17:25:52.0\",\"createUserId\":1,\"isDisable\":false,\"lastAlarmTime\":\"2017-06-28 17:25:27.0\",\"metricName\":\"system.cpu.user\",\"metricTag\":\"#address:wuhan\",\"updateTime\":\"2017-06-29 15:49:18.0\"}},\"alarmId\":7,\"allMark\":{\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\":{\"changePutTime\":true,\"lastPutTsdbTime\":1499655374,\"lastSuccessCheckTime\":1499655379,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tagMap\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"}}},\"joinType\":3,\"useMetricUnit\":\"percent\",\"validataDetails\":{\"status\":0,\"validataMerges\":[{\"alarmMarkDto\":{\"changePutTime\":true,\"lastPutTsdbTime\":1499655374,\"lastSuccessCheckTime\":1499655379,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tagMap\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"}},\"status\":0,\"tag\":\"host:cfeng-4\",\"validataNodata\":{\"currentTime\":1499655379,\"isNodata\":false,\"lastSuccessCheckTime\":1499655379,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"tag\":{\"host\":\"cfeng-4\",\"#address\":\"wuhan\",\"!host\":\"paas-177\"},\"thresholdTime\":60},\"validataStatic\":{\"converToThresholdValue\":123.0,\"end\":1499655374,\"intervalAggregator\":\"avg\",\"isAlart\":true,\"operator\":1,\"series\":\"avg:system.cpu.user{host:cfeng-4,#address:wuhan,!host:paas-177}\",\"start\":1499655074,\"sysUnit\":\"percent\",\"tag\":{\"#address\":\"wuhan\",\"host\":\"cfeng-4\",\"!host\":\"paas-177\"},\"thresholdTime\":300,\"thresholdValue\":\"123\",\"value\":5.089640821729388}}],\"validataTimeSeconds\":1499655379}}"; Setset = new HashSet (); set.add(jsonstr0); set.add(jsonstr1); Gson gs = new Gson(); List
//获取设备信息(只有硬件设备和虚拟设备有) HashMapparamMap = new HashMap (); paramMap.put("hostid", mHostId); paramMap.put("ptype", dto.getPtype()); paramMap.put("type_flag", dto.getTypeFlag()); paramMap.put("api_key", apikey); String resStr = HttpUtils.get(DEVICE_INFO_URL, paramMap); JSONObject jobj = JSON.parseObject(resStr); JSONObject obj = (JSONObject)jobj.get("result"); if(obj.size() != 0){ String restr = jobj.get("result").toString(); DeviceInfoDto deviceInfoDto = new Gson().fromJson(restr, DeviceInfoDto.class); dto.setDeviceInfo(deviceInfoDto); }
List> result = new ArrayList >(); Map timeMap = null; List > timeArr = new ArrayList >(); for (int j = 0; j < result.size(); j++) { timeMap = new HashMap (); if (j == result.size() - 1) { timeMap.put("startTime",result.get(j).get(result.get(j).keySet().iterator().next()) + ""); timeMap.put("endTime", System.currentTimeMillis() + ""); } else { timeMap.put("startTime", result.get(j).get(result.get(j).keySet().iterator().next()) + ""); timeMap.put("endTime", (result.get(j+1).get(result.get(j+1).keySet().iterator().next()) - 1) + ""); } timeMap.put("hostName", "*"); //1:info,2:error,3:success,4:warning Integer key = result.get(j).keySet().iterator().next(); if (key == 1) { timeMap.put("status", "info"); } else if (key == 2) { timeMap.put("status", "error"); } else if (key == 3) { timeMap.put("status", "success"); } else if (key == 4) { timeMap.put("status", "warning"); } timeArr.add(timeMap); }
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