android json 解析 kotlin

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前面写了一次 kotlin解析json 但是，真的写得太烂，直接删掉了，现在重新整理一下。顺便记录一下今天坑了我很久的小问题。

1.首先从最简单的入手吧

一个json的字符串：=====就叫做jsonString吧

{
"code": "200",
"msg": "success",
"debugMsg": "",
"result": {
"data": "1231414"
}
}

好了怎么解析呢？？？

用一个函数即可

fun get_key_string(key:String,jsonString:String):String {
var str: String = ""
try { val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getString(key)
} catch (e: JSONException) {
e.printStackTrace()
}
return str
}

怎么用呢？？？

val msg=get_key_string("msg","jsonString")

第一个参数=====在json字符串中，你想要解析的key，我上面的例子有 code,msg,debugMsg,result，我选择的是msg

第二个参数=====就是json字符串的名称，就是一个字符串，不要想得太复杂了

msg解析后的结果=====success

2.多重解析

依旧是上面的例子吧=====json字符串名字依旧叫做jsonString

{
"code": "200",
"msg": "success",
"debugMsg": "",
"result": {
"data": "1231414"
}
}

我想要得到data怎么办呢？？？

很简单，两步即可。

val result=get_key_String("result","jsonString")//=====这里的第二个参数依旧是jsonString

val data=get_key_String("data","result")//=====注意这里的第二个参数已经变成了result了

3.解析整型，boolean类型

这个和解析String类型类似，直接上代码吧

fun get_key_boolean(key:String,jsonString:String):Boolean {//解析成Boolean
var str: Boolean =true
try {
val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getBoolean(key)
} catch (e: JSONException) {
e.printStackTrace()
}
return str
} fun get_key_int(key:String,jsonString:String):Int {//解析成Int
var str: Int=0
try {
val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getInt(key)
} catch (e: JSONException) {
e.printStackTrace()
}
return str
}

4.稍微牛逼一点的解析=====解析成List<Map<String,Any>>=====其实这个就比较通用了，很多东西直接用这个就可以了

比如来一个复杂一点的jsonString吧

{
"code": "200",
"msg": "success",
"debugMsg": "",
"result": {
"data": [
"key1": "string"
"key2": 123
"key3": true

]

}
}

这样一个jsonString，key1对应一个字符串，key2对应一个整型，key3对应一个布尔类型

怎么解析呢？？？

fun getListMap(key: String, jsonString: String): List<Map<String, Any>> {
val list = ArrayList<Map<String, Any>>()
try {
val jsonObject = JSONObject(jsonString)
val jsonArray = jsonObject.getJSONArray(key)
for (i in 0..jsonArray.length() - 1) {
val jsonObject2 = jsonArray.getJSONObject(i)
val map = HashMap<String, Any>()
val iterator = jsonObject2.keys()
while (iterator.hasNext()) {
val json_key = iterator.next()
var json_value: Any? = jsonObject2.get(json_key)
if (json_value == null) {
json_value = ""
}
map.put(json_key, json_value)
}
list.add(map)
}
} catch (e: JSONException) { e.printStackTrace()
}
return list
}

主要有2个步骤

val result=get_key_string("result","jsonString")

val data=getListMap("data","result")

就这么666

5.将所有的可以用到的方法封装起来吧

class JsonUtil {
companion object { fun get_key_string(key:String,jsonString:String):String {
var str: String = "" try { val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getString(key) } catch (e: JSONException) {
e.printStackTrace()
}
return str
} fun get_key_boolean(key:String,jsonString:String):Boolean {
var str: Boolean =true
try {
val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getBoolean(key)
} catch (e: JSONException) {
e.printStackTrace()
}
return str
} fun get_key_int(key:String,jsonString:String):Int {
var str: Int=0
try {
val jsonObj:JSONObject= JSONObject(jsonString)
str=jsonObj.getInt(key)
} catch (e: JSONException) {
e.printStackTrace()
}
return str
} fun getList(key: String, jsonString: String): List<String> {
val list = ArrayList<String>()
try {
val jsonObject = JSONObject(jsonString)
val jsonArray = jsonObject.getJSONArray(key)
for (i in 0..jsonArray.length() - 1) {
val msg = jsonArray.getString(i)
list.add(msg)
}
} catch (e: JSONException) {
e.printStackTrace()
} return list
} fun getListMap(key: String, jsonString: String): List<Map<String, Any>> {
val list = ArrayList<Map<String, Any>>()
try {
val jsonObject = JSONObject(jsonString)
val jsonArray = jsonObject.getJSONArray(key)
for (i in 0..jsonArray.length() - 1) {
val jsonObject2 = jsonArray.getJSONObject(i)
val map = HashMap<String, Any>()
val iterator = jsonObject2.keys()
while (iterator.hasNext()) {
val json_key = iterator.next()
var json_value: Any? = jsonObject2.get(json_key)
if (json_value == null) {
json_value = ""
}
map.put(json_key, json_value)
}
list.add(map)
}
} catch (e: JSONException) { e.printStackTrace()
}
return list
} fun get_ask_Item(key:String,jsonString:String): ArrayList<MyAsk>? {
var myAsk=ArrayList<MyAsk>()
try{
val jsonObject=JSONObject(jsonString)
val jsonArray=jsonObject.getJSONArray(key)
for(i in 0..jsonArray.length()-1){
val json_ask=jsonArray.getJSONObject(i)
var my_ask=MyAsk()
val commentCount=json_ask.getString("commentCount")
val commentID=json_ask.getString("commentID")
val content=json_ask.getString("content")
val createTime=json_ask.getString("createTime")
val gender=json_ask.getString("gender")
val icon=json_ask.getString("icon")
val id=json_ask.getString("id")
val isFavorite=json_ask.getString("isFavorite")
val isZan=json_ask.getString("isZan")
val label=json_ask.getString("label")
val link=json_ask.getString("link")
val nickname=json_ask.getString("nickname")
val publisherID=json_ask.getString("publisherID")
val reward=json_ask.getString("reward")
val type=json_ask.getString("type")
val zan=json_ask.getString("zan") val image_array=json_ask.getJSONArray("image")
var image_list:ArrayList<String>?=null
for(j1 in 0..image_array.length()-1){
val image_item=image_array.getString(j1)
image_list?.add(image_item)
} val thumbnailImage_array=json_ask.getJSONArray("thumbnailImage")
var image_list2:ArrayList<String>?=null
for(j2 in 0..thumbnailImage_array.length()-1){
val image_item=thumbnailImage_array.getString(j2)
image_list2?.add(image_item)
} my_ask.commentID=commentID
my_ask.commentCount=commentCount
my_ask.content=content
my_ask.createTime=createTime
my_ask.gender=gender
my_ask.icon=icon
my_ask.id=id
my_ask.favoriteIs=isFavorite
my_ask.zan=zan
my_ask.zanIs=isZan
my_ask.label=label
my_ask.link=link
my_ask.nickname=nickname
my_ask.publisherID=publisherID
my_ask.reward=reward
my_ask.type=type
my_ask.image=image_list
my_ask.thumbnailImage=image_list2 myAsk?.add(my_ask)
}
return myAsk
}catch (e:JSONException){
e.printStackTrace()
}
return myAsk
} }}