Jayway JsonPath中的DEFAULT\u PATH\u LEAF\u TO\u NULL调整配置不会为内部数组返回NULL

我认为您忽略了默认的\u PATH\u LEAF\u TO\u NULL设置的叶部分。您的路径具有存储-->书籍-->authorextra-->因此,将设置为NULL的叶是authorextra缺少的那些auth1。因为第一本书是唯一一本有authorextra的书,所以它是唯一一本给你结果的书,因为它是唯一一本你可以寻找叶子的书。如果您尝试其他json文档:

{
   "store" : {
      "book" : [
         {
            "category" : "reference",
            "authorextra": [
              {
                "auth1":"Nigel Rees",
                "auth2":"xxxx"
              }
              ],
            "title" : "Sayings of the Century",
            "price" : 8.95
         },
         {
            "category" : "fiction",
            "authorextra": [
              {
                "auth2":"Evelyn Waugh"
              }
              ],
            "title" : "Sword of Honour",
            "price" : 12.99
         },
         {
            "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
         }
      ],
      "bicycle" : {
         "color" : "red",
         "price" : 19.95
      }
   },
   "expensive" : 10
}

您将得到[“Nigel Rees”,null],因为第二本书也有authorextra,但缺少auth1,即叶子。