給定一個 JSON 對象，如："book": [ { "category": "reference", "author": "Nigel Rees", "book_id": "214515", "title": "Sayings of the Century", "price": 8.95, "reviews": [ { "rating": 2, "reviewer": "Amazon", "weight": 0 }, { ... } ] }, { ... }是否可以選擇 book_id 以及該書的部分或全部評論？結(jié)果可能如下所示：[ { "book_id": "...", "reviews": [ ... ] }, { ... }]我一直在使用 Jayway jsonpath：https : //github.com/json-path/JsonPath以下不適合處理數(shù)組時的解決方案，例如“評論”，然后以編程方式加入： List ids = JsonPath.read(json, "$.store.books[*].book_id"); List reviews = JsonPath.read(json, "$.store.books[*].reviews[*]");
1 回答
Qyouu
TA貢獻1786條經(jīng)驗 獲得超11個贊
按照 上的文檔https://github.com/json-path/JsonPath，這應該給你你正在尋找的東西。
List output = JsonPath.read(json, "$.books[*].['book_id', 'reviews'])");
看看這個測試用例。
@Test
final void test2() {
String json = "{ \"books\": ["
+ " {"
+ " \"category\": \"reference\","
+ " \"author\": \"Nigel Rees\","
+ " \"book_id\": \"214515\","
+ " \"title\": \"Sayings of the Century\","
+ " \"price\": 8.95,"
+ " \"reviews\": ["
+ " {"
+ " \"rating\": 2,"
+ " \"reviewer\": \"Amazon\","
+ " \"weight\": 0"
+ " }"
+ " ]"
+ " },"
+ " {"
+ " \"category\": \"reference\","
+ " \"author\": \"Nigel Rees\","
+ " \"book_id\": \"314515\","
+ " \"title\": \"Sayings of the Century\","
+ " \"price\": 8.95,"
+ " \"reviews\": ["
+ " {"
+ " \"rating\": 4,"
+ " \"reviewer\": \"Trip\","
+ " \"weight\": 5"
+ " }"
+ " ]"
+ " }"
+ " ]"
+ "}";
List output = JsonPath.read(json, "$.books[*].['book_id', 'reviews'])");
String expectedOutput =
"["
+ "{"
+ "\"book_id\":\"214515\","
+ "\"reviews\":["
+ "{"
+ "\"rating\":2,\"reviewer\":\"Amazon\",\"weight\":0"
+ "}"
+ "]"
+ "},"
+ "{"
+ "\"book_id\":\"314515\","
+ "\"reviews\":["
+ "{\"rating\":4,\"reviewer\":\"Trip\",\"weight\":5}"
+ "]"
+ "}"
+ "]";
assertEquals(expectedOutput, output.toString());
}
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