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:warningInteger 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);
}
以上这篇Java遍历json字符串取值的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
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