java - Jackson 数据绑定(bind) MismatchedInputException

Question

使用 spring 配置将数据从 json 读取到 spring bean 中，它适用于简单类型，但在尝试读取数组时出现上述错误这是我的配置

@Bean
Container container() throws IOException {

    ObjectMapper objectMapper = new ObjectMapper();

    return objectMapper.readValue(getClass().getClassLoader().getResource("book.json"), Container.class);
}

我决定按照建议放入一个容器，所以我的配置看起来像这样可以吗？因为我将使用这些数据来创建一些 Spring Controller 。POJO类

public class Container {
String requestedUrl;
  List<Item> items;}

这是json数据，

{
  "requestedUrl": "https://www.googleapis.com/books/v1/volumes?q=java&maxResults=40",
  "items": [
    {
      "kind": "books#volume",
      "id": "7tkN1CYzn2cC",
      "etag": "pfjjxSpetIM",
      "selfLink": "https://www.googleapis.com/books/v1/volumes/7tkN1CYzn2cC",
      "volumeInfo": {
        "title": "A Hypervista of the Java Landscape",
        "publisher": "InfoStrategist.com",
        "industryIdentifiers": [
          {
            "type": "ISBN_13",
            "identifier": "9781592432172"
          },
          {
            "type": "ISBN_10",
            "identifier": "1592432174"
          }
        ],
        "readingModes": {
          "text": true,
          "image": true
        },
        "printType": "BOOK",
        "maturityRating": "NOT_MATURE",
        "allowAnonLogging": false,
        "contentVersion": "1.0.1.0.preview.3",
        "imageLinks": {
          "smallThumbnail": "http://books.google.com/books/content?id=7tkN1CYzn2cC&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_api",
          "thumbnail": "http://books.google.com/books/content?id=7tkN1CYzn2cC&printsec=frontcover&img=1&zoom=1&edge=curl&source=gbs_api"
        },
        "language": "en",
        "previewLink": "http://books.google.pl/books?id=7tkN1CYzn2cC&pg=PP1&dq=java&hl=&cd=1&source=gbs_api",
        "infoLink": "http://books.google.pl/books?id=7tkN1CYzn2cC&dq=java&hl=&source=gbs_api",
        "canonicalVolumeLink": "https://books.google.com/books/about/A_Hypervista_of_the_Java_Landscape.html?hl=&id=7tkN1CYzn2cC"
      },
      "saleInfo": {
        "country": "PL",
        "saleability": "NOT_FOR_SALE",
        "isEbook": false
      }, //Shortened for brevity 

如何编辑配置以使其正常工作

Answer 1

您正在传递以 {} 为界的 json 对象，但尝试将其转换为数组。使用此 json，您应该转换为另一个类，例如

public class Container {
    private String requestedUrl;
    private List<Item> items;

    // getters/setters
}