Java遍历json字符串取值的实例

2023-09-14 17:27:05 142

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。

JSONArrayjson=(JSONArray)JSONArray.parse(str);
for(Objectobj:json){
JSONObjectjo=(JSONObject)obj;
intstatus=jo.getInteger("status");
Stringmessage=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
*@paramstr
*@return
*@throwsException
*/
privateList>operStr(Stringstr)throwsException{
List>mList=newArrayList>();//探针开启的服务名list
JSONArrayjson=(JSONArray)JSONArray.parse(str);
MapobjMap=null;
MapresMap=null;
for(Objectobj:json){
objMap=Obj2Map(obj);
@SuppressWarnings("unchecked")
MapmObj=(Map)objMap.get("map");
intstatus=(Integer)mObj.get("status");
if(status!=0){
resMap=newHashMap();
switch(status){
case1:
resMap.put("status","WARNING");
break;
case2:
resMap.put("status","ERROR");
break;
case3:
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);
}
}
returnmList;
}
/**
*object转map
*@paramobj
*@return
*@throwsException
*/
publicMapObj2Map(Objectobj)throwsException{
if(obj==null){
returnnull;
}
Mapmap=newHashMap();
Field[]fields=obj.getClass().getDeclaredFields();
for(Fieldfield:fields){
field.setAccessible(true);
map.put(field.getName(),field.get(obj));
}
returnmap;
}

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
*@paramstr
*@return
*@throwsException
*/
privateList>operStr(Stringstr)throwsException{
List>mList=newArrayList>();//探针开启的服务名list
JSONArrayjson=(JSONArray)JSONArray.parse(str);
MapresMap=null;
for(Objectobj:json){
JSONObjectjo=(JSONObject)obj;
intstatus=jo.getInteger("status");
if(status!=0){
resMap=newHashMap();
switch(status){
case1:
resMap.put("status","WARNING");
break;
case2:
resMap.put("status","ERROR");
break;
case3:
resMap.put("status","CRIT");
break;
default:
break;
}
resMap.put("serviceName",(jo.getString("check")).split("\\.")[0]);
resMap.put("msg",jo.getString("message"));
mList.add(resMap);
}
}
returnmList;
}

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",
"'Foundnovalidconnectionsinlist:[]'",
{
"version":"[8,4,20]"
}
]
]

方法一

/**
*通过查询agentChecksStr解析得到异常信息
*@paramagentChecksStr
*@return
*/
privateList>getExceptInfoFromAgentChecks(StringagentChecksStr){
List>mList=newArrayList>();//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
ObjectjsonArray=JSONArray.parse(agentChecksStr);
@SuppressWarnings("unchecked")
List>list=(List>)jsonArray;
Mapmap=null;
for(inti=0;i();
Stringstatus=list.get(i).get(3).toString();
if(!status.equals("OK")){
StringserviceName=list.get(i).get(0).toString();
Stringmsg=list.get(i).get(4).toString();
map.put("serviceName",serviceName);
map.put("status",status);
map.put("msg",msg);
mList.add(map);
}
}
returnmList;
}

方法二

/**
*通过查询agentChecksStr解析得到异常信息
*@paramagentChecksStr
*@return
*/
privateList>getExceptInfoFromAgentChecks(StringagentChecksStr){
//探针开启的服务名list
List>mList=newArrayList>();
JSONArrayjsonArray=(JSONArray)JSONArray.parse(agentChecksStr);
Mapmap=null;
for(Objectobj:jsonArray){
map=newHashMap();
JSONArrayja=(JSONArray)obj;
Stringstatus=ja.getString(3);
if(!status.equals("OK")){
StringserviceName=ja.getString(0);
Stringmsg=ja.getString(4);
map.put("serviceName",serviceName);
map.put("status",status);
map.put("msg",msg);
mList.add(map);
}
}
returnmList;
}

Gson将json字符串转化为json对象：

importcom.google.gson.Gson;
importcom.google.gson.JsonArray;
importcom.google.gson.JsonElement;
importcom.google.gson.JsonObject;
importcom.google.gson.JsonParser;
publicclassMainTest{
publicstaticvoidmain(String[]args)throwsException{
Stringjsonstr0="{\"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\":\"2017-06-2817:25:52.0\",\"createUserId\":1,\"isDisable\":false,\"lastAlarmTime\":\"2017-06-2817:25:27.0\",\"metricName\":\"system.cpu.user\",\"metricTag\":\"#address:wuhan\",\"updateTime\":\"2017-06-2915:49:18.0\"}},\"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}}";
Stringjsonstr1="{\"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\":\"2017-06-2817:25:52.0\",\"createUserId\":1,\"isDisable\":false,\"lastAlarmTime\":\"2017-06-2817:25:27.0\",\"metricName\":\"system.cpu.user\",\"metricTag\":\"#address:wuhan\",\"updateTime\":\"2017-06-2915:49:18.0\"}},\"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=newHashSet();
set.add(jsonstr0);
set.add(jsonstr1);
Gsongs=newGson();
List

Java遍历json字符串取值的实例

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