JSON簡介
- JSON是一種輕量級的數據交換格式，採用完全獨立於編程語言的文本格式來存儲和表示數據。本質上就是一個"特殊格式"的字符串。
- JSON 是網絡上用來傳輸數據使用最廣泛的數據格式沒有之一，且JSON比XML更輕量級
JSON的數據結構
- {對象}：保存對象（JSONObject）
- [數組]： 保存數組（JSONArray）
- 提示 : JSON描述對象的語法格式很像字典，但是不是字典，僅僅是鍵值對的形式很像。
json示例:
{
"code":200,
"data":{
"cars":[
{
"maxCapOfLuggage":5,
"capOfLuggage":2,
"capOfPerson":4,
"carDesc":"經濟5座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/100005.png"
],
"carType":1,
"carTypeId":100005,
"currency":"RMB",
"currencyRate":1,
"priceId":"bd1434bb-f0c3-4b2b-b30a-785149b58f4a",
"price":199,
"priceLabel":"199.00",
"basePrice":199,
"priceSign":"a32c5cee4652db098d190c1646eadc94",
"models":"服務車型:xB或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":5,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":8,
"capOfLuggage":3,
"capOfPerson":6,
"carDesc":"經濟7座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/100007.png"
],
"carType":1,
"carTypeId":100007,
"currency":"RMB",
"currencyRate":1,
"priceId":"1bafa544-6af9-4c42-af60-4a976e2575f1",
"price":246,
"priceLabel":"246.00",
"basePrice":246,
"priceSign":"675f81a66d2f0199cb55962e79daa405",
"models":"服務車型:格銳Maxcruz或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":7,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":5,
"capOfLuggage":2,
"capOfPerson":4,
"carDesc":"舒適5座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/200005.png"
],
"carType":2,
"carTypeId":200005,
"currency":"RMB",
"currencyRate":1,
"priceId":"17eefa46-e3fe-45d3-be74-3948b4627f6e",
"price":230,
"priceLabel":"230.00",
"basePrice":230,
"priceSign":"28be1fedbc722b5e3ae598e2334748ce",
"models":"服務車型:LS400或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":5,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":8,
"capOfLuggage":3,
"capOfPerson":6,
"carDesc":"舒適7座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/200007.png"
],
"carType":2,
"carTypeId":200007,
"currency":"RMB",
"currencyRate":1,
"priceId":"903994cb-f3b0-4acc-978e-ed85786af622",
"price":261,
"priceLabel":"261.00",
"basePrice":261,
"priceSign":"57443a58f36c6633a8d809de0096652f",
"models":"服務車型:Express或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":7,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":12,
"capOfLuggage":5,
"capOfPerson":8,
"carDesc":"舒適9座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/200009.png"
],
"carType":2,
"carTypeId":200009,
"currency":"RMB",
"currencyRate":1,
"priceId":"4a86aefd-4cbf-4088-afb2-ac5a605011d0",
"price":431,
"priceLabel":"431.00",
"basePrice":431,
"priceSign":"b1c60f5e19378dfa067d77ba8783230a",
"models":"服務車型:海獅（Hiace）或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":9,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":15,
"capOfLuggage":6,
"capOfPerson":10,
"carDesc":"舒適12座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/200012.png"
],
"carType":2,
"carTypeId":200012,
"currency":"RMB",
"currencyRate":1,
"priceId":"1644b59e-8324-4813-ad3e-75d4f03612ce",
"price":385,
"priceLabel":"385.00",
"basePrice":385,
"priceSign":"5b0896f661dceb42f1fb3540ed73d3e1",
"models":"服務車型:或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":12,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":6,
"capOfLuggage":3,
"capOfPerson":4,
"carDesc":"豪華5座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/300005.png"
],
"carType":3,
"carTypeId":300005,
"currency":"RMB",
"currencyRate":1,
"priceId":"01a25068-7256-466a-b6af-7f11cc08a5ae",
"price":323,
"priceLabel":"323.00",
"basePrice":323,
"priceSign":"86caaf12fc7a50b1ddea7807522829fb",
"models":"服務車型:ML500或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":5,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":9,
"capOfLuggage":4,
"capOfPerson":6,
"carDesc":"豪華7座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/300007.png"
],
"carType":3,
"carTypeId":300007,
"currency":"RMB",
"currencyRate":1,
"priceId":"b1b240b7-d75e-480c-8386-d8e57bd317e4",
"price":365,
"priceLabel":"365.00",
"basePrice":365,
"priceSign":"bc1cc906d39dbb946831e677f54f3f3f",
"models":"服務車型:V Class或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":7,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":6,
"capOfLuggage":3,
"capOfPerson":4,
"carDesc":"尊享5座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/400005.png"
],
"carType":4,
"carTypeId":400005,
"currency":"RMB",
"currencyRate":1,
"priceId":"83993089-a410-4cd9-aacd-f639415ef7f6",
"price":489,
"priceLabel":"489.00",
"basePrice":489,
"priceSign":"6db3e48a5082f4d554fe20cee7adbb16",
"models":"服務車型:歐陸飛馳或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":5,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
},
{
"maxCapOfLuggage":9,
"capOfLuggage":4,
"capOfPerson":6,
"carDesc":"尊享7座",
"carIntroduction":"",
"carPictures":[
"http://basedata.bj.bcebos.com/cartype/400007.png"
],
"carType":4,
"carTypeId":400007,
"currency":"RMB",
"currencyRate":1,
"priceId":"a891b1bf-0bc9-4126-a3e6-2bf237c44c1c",
"price":572,
"priceLabel":"572.00",
"basePrice":572,
"priceSign":"20208f6974eefc17d1b19bec4be1d608",
"models":"服務車型:GL450或同級別車型",
"priceDeadTime":"2019-07-03 15:53:16",
"quoteList":[
"Quote1",
"Quote2",
"Quote3"
],
"seatType":7,
"serviceTags":[
"中文司導"
],
"urgentFlag":0,
"expenseDetail":null
}
],
"additionalServicePrice":{
"childSeatPrice":0,
"isSupportCheckIn":false,
"checkInPrice":0,
"isSupportWelcomeboard":true,
"welcomeboardPrice":50
},
"distance":27,
"enableLocal":0,
"estTime":26,
"noneCarsReason":"",
"noneCarsState":0
},
"desc":""
}
json解析
-
FastJson
引入依賴：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
fastjson常用API：
抽象類JSON中的常用方法（部分）：
public static Object parse(String text);//將字符串解析爲對象
public static JSONArray parseArray(String text);//將字符串解析爲JSONArray
public static <T> List<T> parseArray(String text, Class<T> clazz);//將字符串解析爲List
public static List<Object> parseArray(String text, Type[] types);//將字符串解析爲List
public static <T> T parseObject(String text, Class<T> clazz);//將字符串解析爲對象
public static JSONObject parseObject(String text)//將字符串解析爲JSONObeject
public static Object toJSON(Object javaObject)//
public static String toJSONString(Object object)//將對象轉換爲JSONString
類JSONObject中的常用方法（部分）：
public boolean containsKey(Object key)//是否包含指定對象Key，返回布爾值
public boolean containsValue(Object value)//是否包含指定對象Value，返回布爾值
public Object get(Object key)//通過對象Key，返回對象
public Boolean getBoolean(String key)//通過字符串Key，返回布爾值
public int getIntValue(String key)//通過指定字符串Key，返回int
public JSONArray getJSONArray(String key)//通過指定字符串Key，返回JSONArray
public JSONObject getJSONObject(String key)//通過指定字符串Key，返回JSONObject
public <T> T getObject(String key, Class<T> clazz)//通過指定字符串Key和類對象，返回指定的對象
類JSONArray中的常用方法（部分）：
public boolean add(Object e)//添加指定對象，添加成功返回true,否則返回false
public boolean contains(Object o)//是否包含指定對象，包含返回true，不包含返回false
public Object get(int index)//通過索引返回對象
public Boolean getBoolean(int index)//通過索引返回布爾值
public Long getLong(int index)//通過索引返回Long
public JSONObject getJSONObject(int index)//通過索引返回JSONObject
public Object remove(int index)//通過索引刪除指定對象，並返回刪除的對象
public Object set(int index, Object element)//設置指定索引的元素，返回原有對象
public int size() //返回JSONArray的大小
示例：
package com.xyj.testplatform.util;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import static com.xyj.testplatform.util.FileUtils.ReadFile;
public class JsonUtil {
public static void main(String[] args) {
String str = ReadFile("E:\\Myproject\\server-pricecheck\\src\\main\\java\\com\\xyj\\testplatform\\util\\a.txt");
JSONObject resultObject = JSONObject.parseObject(str);
JSONArray cars = resultObject.getJSONObject("data").getJSONArray("cars");
JSONArray respData = new JSONArray();
for (int j = 0; j < cars.size(); j++) {
JSONObject car = cars.getJSONObject(j);
JSONObject respObject = new JSONObject();
respObject.put("carTypeId", car.getInteger("carTypeId"));
respObject.put("carDesc", car.getString("carDesc"));
respObject.put("basePrice", car.getInteger("basePrice"));
respData.add(respObject);
}
System.out.println(respData);
}
}
控制檯輸出：
[{"carDesc":"經濟5座","carTypeId":100005,"basePrice":199},{"carDesc":"經濟7座","carTypeId":100007,"basePrice":246},{"carDesc":"舒適5座","carTypeId":200005,"basePrice":230},{"carDesc":"舒適7座","carTypeId":200007,"basePrice":261},{"carDesc":"舒適9座","carTypeId":200009,"basePrice":431},{"carDesc":"舒適12座","carTypeId":200012,"basePrice":385},{"carDesc":"豪華5座","carTypeId":300005,"basePrice":323},{"carDesc":"豪華7座","carTypeId":300007,"basePrice":365},{"carDesc":"尊享5座","carTypeId":400005,"basePrice":489},{"carDesc":"尊享7座","carTypeId":400007,"basePrice":572}]
-
JsonPath
引入依賴：
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<version>2.3.0</version>
</dependency>
JSONPaht 用一個抽象的名字$來表示最外層對象。
示例：
List<Integer> car1 = context.read("$.data.cars[*].carTypeId");
System.out.println( car1);//[100005,100007,200005,200007,200009,200012,300005,300007,400005,400007]
List<Integer> car2 = context.read("$..carTypeId");
System.out.println( car2);//[100005,100007,200005,200007,200009,200012,300005,300007,400005,400007]
Integer car3 = context.read("$.data.cars[0].carTypeId");
System.out.println( car3);//100005
List<Integer> car4 = context.read("$.data.cars[0,2].carTypeId");
System.out.println( car4);//[100005,200005]
List<Integer> car5 = context.read("$.data.cars[1:].carTypeId");
System.out.println( car5);//[100007,200005,200007,200009,200012,300005,300007,400005,400007]
List<Integer> car6 = context.read("$.data.cars[:3].carTypeId");
System.out.println( car6);//[100005,100007,200005]
List<Integer> car7 = context.read("$.data.cars[?(@.price> 500)]");
System.out.println( car7);//[{"maxCapOfLuggage":9,"capOfLuggage":4,"capOfPerson":6,"carDesc":"尊享7座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/400007.png"],"carType":4,"carTypeId":400007,"currency":"RMB","currencyRate":1,"priceId":"a891b1bf-0bc9-4126-a3e6-2bf237c44c1c","price":572,"priceLabel":"572.00","basePrice":572,"priceSign":"20208f6974eefc17d1b19bec4be1d608","models":"服務車型:GL450或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":7,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null}]
List<Integer> car8 = context.read("$.data.cars[?(@.carDesc=='經濟7座')]");
System.out.println( car8);//[{"maxCapOfLuggage":8,"capOfLuggage":3,"capOfPerson":6,"carDesc":"經濟7座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/100007.png"],"carType":1,"carTypeId":100007,"currency":"RMB","currencyRate":1,"priceId":"1bafa544-6af9-4c42-af60-4a976e2575f1","price":246,"priceLabel":"246.00","basePrice":246,"priceSign":"675f81a66d2f0199cb55962e79daa405","models":"服務車型:格銳Maxcruz或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":7,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null}]
Integer car9 = context.read("$.data.cars.length()");
System.out.println( car9);//10
List<Integer> car10 = context.read("$.data.cars[?(@.price > 200 && @.price <400)]");
System.out.println( car10);//[{"maxCapOfLuggage":8,"capOfLuggage":3,"capOfPerson":6,"carDesc":"經濟7座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/100007.png"],"carType":1,"carTypeId":100007,"currency":"RMB","currencyRate":1,"priceId":"1bafa544-6af9-4c42-af60-4a976e2575f1","price":246,"priceLabel":"246.00","basePrice":246,"priceSign":"675f81a66d2f0199cb55962e79daa405","models":"服務車型:格銳Maxcruz或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":7,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null},{"maxCapOfLuggage":5,"capOfLuggage":2,"capOfPerson":4,"carDesc":"舒適5座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/200005.png"],"carType":2,"carTypeId":200005,"currency":"RMB","currencyRate":1,"priceId":"17eefa46-e3fe-45d3-be74-3948b4627f6e","price":230,"priceLabel":"230.00","basePrice":230,"priceSign":"28be1fedbc722b5e3ae598e2334748ce","models":"服務車型:LS400或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":5,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null},{"maxCapOfLuggage":8,"capOfLuggage":3,"capOfPerson":6,"carDesc":"舒適7座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/200007.png"],"carType":2,"carTypeId":200007,"currency":"RMB","currencyRate":1,"priceId":"903994cb-f3b0-4acc-978e-ed85786af622","price":261,"priceLabel":"261.00","basePrice":261,"priceSign":"57443a58f36c6633a8d809de0096652f","models":"服務車型:Express或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":7,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null},{"maxCapOfLuggage":15,"capOfLuggage":6,"capOfPerson":10,"carDesc":"舒適12座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/200012.png"],"carType":2,"carTypeId":200012,"currency":"RMB","currencyRate":1,"priceId":"1644b59e-8324-4813-ad3e-75d4f03612ce","price":385,"priceLabel":"385.00","basePrice":385,"priceSign":"5b0896f661dceb42f1fb3540ed73d3e1","models":"服務車型:或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":12,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null},{"maxCapOfLuggage":6,"capOfLuggage":3,"capOfPerson":4,"carDesc":"豪華5座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/300005.png"],"carType":3,"carTypeId":300005,"currency":"RMB","currencyRate":1,"priceId":"01a25068-7256-466a-b6af-7f11cc08a5ae","price":323,"priceLabel":"323.00","basePrice":323,"priceSign":"86caaf12fc7a50b1ddea7807522829fb","models":"服務車型:ML500或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":5,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null},{"maxCapOfLuggage":9,"capOfLuggage":4,"capOfPerson":6,"carDesc":"豪華7座","carIntroduction":"","carPictures":["http:\/\/basedata.bj.bcebos.com\/cartype\/300007.png"],"carType":3,"carTypeId":300007,"currency":"RMB","currencyRate":1,"priceId":"b1b240b7-d75e-480c-8386-d8e57bd317e4","price":365,"priceLabel":"365.00","basePrice":365,"priceSign":"bc1cc906d39dbb946831e677f54f3f3f","models":"服務車型:V Class或同級別車型","priceDeadTime":"2019-07-03 15:53:16","quoteList":["Quote1","Quote2","Quote3"],"seatType":7,"serviceTags":["中文司導"],"urgentFlag":0,"expenseDetail":null}]
Double car11 = context.read("$.max($.data.cars[0].price,$.data.cars[2].price)");
System.out.println( car11);//230.0
表達式彙總：
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