[英]Minimum using Jayway JsonPath
我正在嘗試使用JsonPath從Give json中找到最小的特定值。
給定以下json(從此處獲取 ):
{
"store": {
"book": [{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
}, {
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}]
},
"expensive": 10
}
我試圖找出所有書籍價格中的最低價格。 所以基本上我期望:
min(8.99,22.99) = 8.99
通過查看jsonPath github頁面上有關函數的示例,我嘗試了以下表達式,但它似乎不起作用。
$..book[*].price.min()
但我收到以下錯誤:
Aggregation function attempted to calculate value using empty array
難道我做錯了什么?
做這樣的事情的正確方法是什么?
編輯:您可以在這里測試表達式
只是為了那些不檢查評論的人,
正如@ cricket_007所評論的,這是一個打開的錯誤, 請在此處檢查
以下是您用解決方案類編寫的解決方案...
import java.util.ArrayList;
import com.google.gson.GsonBuilder;
public class Solution {
public static void main(String[] args) {
//building your object
SolutionTo objSolutionTo = new SolutionTo();
StoreTO objStoreTO = new StoreTO();
ArrayList<BookTo> objArrayList = new ArrayList<BookTo>();
BookTo objBookTo = new BookTo();
objBookTo.setAuthor("Herman Melville");
objBookTo.setCategory("fiction");
objBookTo.setTitle("Moby Dick");
objBookTo.setIsbn("0-553-21311-3");
objBookTo.setPrice(8.99);
BookTo objBookTo2 = new BookTo();
objBookTo2.setAuthor("J. R. R. Tolkien");
objBookTo2.setCategory("fiction");
objBookTo2.setTitle("The Lord of the Rings");
objBookTo2.setIsbn("0-553-21311-3");
objBookTo2.setPrice(22.99);
objArrayList.add(objBookTo);
objArrayList.add(objBookTo2);
objStoreTO.setBook(objArrayList);
objSolutionTo.setStore(objStoreTO);
objSolutionTo.setExpensive(10.0);
System.out.println(new GsonBuilder().serializeNulls().setPrettyPrinting().create().toJson(objSolutionTo));
//The logic you require to find the min value of price
Double minPrice = Double.MAX_VALUE;
for (BookTo bookTo : objSolutionTo.getStore().getBook()) {
if (minPrice > bookTo.getPrice())
minPrice = bookTo.getPrice();
}
System.out.println(minPrice);
}
}
以下是solutionTO類:
public class SolutionTo {
private StoreTO store;
private Double expensive;
public StoreTO getStore() {
return store;
}
public void setStore(StoreTO store) {
this.store = store;
}
public Double getExpensive() {
return expensive;
}
public void setExpensive(Double expensive) {
this.expensive = expensive;
}
}
以下是StoreTo類:
import java.util.ArrayList;
public class StoreTO {
private ArrayList<BookTo> book;
public ArrayList<BookTo> getBook() {
return book;
}
public void setBook(ArrayList<BookTo> book) {
this.book = book;
}
}
以下是bookTo對象:
public class BookTo {
private String category;
private String author;
private String title;
private String isbn;
private Double price;
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
}
在解決方案類中運行main方法,您將找到想要的...
樂於助人... :)
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