Java遍历json字符串取值

json

适用于现代 C++ 的 JSON。

项目地址：https://gitcode.com/gh_mirrors/js/json

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u010466329

38992人浏览 · 2017-05-17 17:21:17

u010466329 · 2017-05-17 17:21:17 发布

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。

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<Map<String,String>> operStr(String str) throws Exception{
        List<Map<String,String>> mList = new ArrayList<Map<String,String>>();//探针开启的服务名list
        JSONArray json = (JSONArray) JSONArray.parse(str);
        Map<String,Object> objMap = null;
        Map<String,String> resMap = null;
        for (Object obj : json) {
            objMap = Obj2Map(obj);
            @SuppressWarnings("unchecked")
            Map<String,Object> mObj = (Map<String, Object>) objMap.get("map");
            int status = (Integer) mObj.get("status");
            if(status != 0){
                resMap = new HashMap<String,String>();
                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", ((String) mObj.get("check")).split("\\.")[0]);
                resMap.put("msg", (String)mObj.get("message"));
                mList.add(resMap);
            }
        }
        return mList;
    }

    /**
     * object转map
     * @param obj
     * @return
     * @throws Exception
     */
    public Map<String,Object> Obj2Map(Object obj) throws Exception{
        if(obj == null){    
            return null;    
        }

        Map<String,Object> map=new HashMap<String, Object>();
        Field[] fields = obj.getClass().getDeclaredFields();
        for(Field field:fields){
            field.setAccessible(true);
            map.put(field.getName(), field.get(obj));
        }
        return map;
    }

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<Map<String,String>> operStr(String str) throws Exception{
        List<Map<String,String>> mList = new ArrayList<Map<String,String>>();//探针开启的服务名list
        JSONArray json = (JSONArray) JSONArray.parse(str);
        Map<String,String> resMap = null;
        for (Object obj : json) {
            JSONObject jo = (JSONObject)obj;
            int status = jo.getInteger("status");
            if(status != 0){
                resMap = new HashMap<String,String>();
                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: [<GearmanConnection localhost:4730 connected=False>]'",
        {
            "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<Map<String,String>> getExceptInfoFromAgentChecks(String agentChecksStr){

        List<Map<String,String>> mList = new ArrayList<Map<String,String>>();//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<Object>> list= (List<List<Object>>) jsonArray;
        Map<String,String> map = null;

        for(int i=0;i<list.size();i++){
            map = new HashMap<String,String>();
            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<Map<String,String>> getExceptInfoFromAgentChecks(String agentChecksStr){
        //探针开启的服务名list
        List<Map<String,String>> mList = new ArrayList<Map<String,String>>();
        JSONArray jsonArray = (JSONArray) JSONArray.parse(agentChecksStr);
        Map<String,String> map = null;
        for (Object obj : jsonArray) {
            map = new HashMap<String,String>();
            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}}";

        Set<String> set = new HashSet<String>();

        set.add(jsonstr0);
        set.add(jsonstr1);


        Gson gs = new Gson();

        List<Object> eventList = new ArrayList<Object>();

        for (String str : set) {

            JsonObject returnData = new JsonParser().parse(str).getAsJsonObject();
            JsonObject ad = returnData.get("alarmDetails").getAsJsonObject();
            JsonObject vd = returnData.get("validataDetails").getAsJsonObject();
            JsonArray vm = vd.get("validataMerges").getAsJsonArray();
            JsonArray nf = ad.get("notify").getAsJsonArray();
            JsonObject v = ad.get("view").getAsJsonObject();
            String validataTimeSeconds = vd.get("validataTimeSeconds").toString();

            for (JsonElement je : vm) {
                je.getAsJsonObject().add("view", v);
                je.getAsJsonObject().add("notify", nf);
                je.getAsJsonObject().addProperty("validataTimeSeconds", Long.parseLong(validataTimeSeconds));

                eventList.add(je);
            }
        }

        for (Object obj : eventList) {
            String inParam = gs.toJson(obj);
            System.out.println(inParam);
        }

        System.out.println(gs.toJson(eventList));

    }
}

//获取设备信息（只有硬件设备和虚拟设备有）
HashMap<String,String> paramMap = new HashMap<String,String>();
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<Map<Integer, Long>> result = new ArrayList<Map<Integer, Long>>();
Map<String, String> timeMap = null;
List<Map<String, String>> timeArr = new ArrayList<Map<String, String>>();
for (int j = 0; j < result.size(); j++) {
timeMap = new HashMap<String, String>();
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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适用于现代 C++ 的 JSON。

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