Jackson Json：将 Json 树节点转换为 Java 对象并将其添加到 ArrayList

Question

我仍然是 Java 和解析 Json 的新手。我正在尝试使用 Spring 构建一个 Comic Webapp。数据库是一个 Json 文件，其中包含一系列不同的漫画。 我想将 Json Array 转换为 Java Objects 并将其放入 ArrayList 但我似乎在此过程中的某个地方犯了错误。也许你可以告诉我我做错了什么？在进行 JUnit 测试时，我收到以下错误：

Error com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "Comic" (class de.uni_koeln.comics.data.Comic), not marked as ignorable (6 known properties: , "title", "issue", "id", "box", "publisher", "comment"])
 at [Source: N/A; line: -1, column: -1] (through reference chain: de.uni_koeln.comics.data.Comic["Comic"])

漫画类

package de.uni_koeln.comics.data;

import de.uni_koeln.comics.service.JsonImportService;

public class Comic {
    private JsonImportService jservice;

public String title;
public int id;
public int issue;
public int box;
public String publisher;
public String comment;

public Comic() {

}
public Comic(String title, int issue, int box, String publisher, String   comment) {
        this.title = title;
        this.issue = issue;
        this.box = box;
        this.comment = comment;
        this.publisher = publisher;
    }

//setter and getter

` JsonImportService

package de.uni_koeln.comics.service;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;


@Service
public class JsonImportService {
    private List<Comic> comicList;

    @Test
    public void readComicJson() throws JsonParseException, JsonMappingException, IOException {

        ObjectMapper mapper = new ObjectMapper();
        JsonNode root = mapper.readTree(new File("src/main/resources/Comics.json"));
    Comic comic = mapper.treeToValue(root, Comic.class);

    JsonNode contactNode = root.path("Comic");
    if (contactNode.isArray()) {
        for (JsonNode node : contactNode) {

            String title = node.path("Title").asText();
            int issue = node.path("Issue #").asInt();
            int box = node.path("Box #").asInt();
            String publisher = node.path("Publisher").asText();
            String comment = node.path("Comments").asText();

            comic.setTitle(title);
            comic.setIssue(issue);
            comic.setBox(box);
            comic.setPublisher(publisher);
            comic.setComment(comment);
            comicList.add(new Comic(title,box,issue,publisher,comment));
        }
    }
}

public List<Comic> getComicList() {
    return comicList;
}

Answer 1

尽量使用@JsonIgnoreProperties注解，比如blow。

@JsonIgnoreProperties(ignoreUnknown = true)

公开课漫画{

}