Json到其他Java对象的转换

正如在标题中一样，我需要将JSON文件转换为java对象。我正在寻找解决这个问题的Spring或Java解决方案

这是我的控制器类（稍后将进行重构）

我想把它转换成这样一个类：

@Data
@AllArgsConstructor
@NoArgsConstructor
public class RepositoryDetailsDTO
{
    String full_name;
    String description;
    String cloneUrl;
    String stars;
    String createdAt;
}

你知道我怎么做吗？我在寻找做这件事的最佳方法。谢谢你的回答。顺便说一句，http客户端目前运行良好，但仅适用于字符串响应。我试着做些类似的事情

HttpResponse<RepositoryDetailsDTO> httpResponse = httpClient.send(request,HttpResponse.BodyHandlers.replacing(repositoryDetailsDTO));

HttpResponse-HttpResponse=httpClient.send（请求，HttpResponse.BodyHandlers.replacement（repositoryDetailsDTO））；

---

但它不起作用。

问题解决了，我发现如下情况：

repositoryDetailsDTO = new ObjectMapper()
                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
                .readValue(httpResponse.body(), RepositoryDetailsDTO.class);

---

我建议为JSON数据创建一个POJO，如果您知道将在JSON中收到的字段，您可以从

然后休息如下

Example.java

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Data
public class Example {
    private Integer id;
    private String node_id;
    private String name;
    private String full_name;
    private Owner owner;
    @JsonProperty("private")
    private Boolean _private;
    private String html_url;
    private String description;
    private Boolean fork;
    private String url;
    private String archive_url;
    private String assignees_url;
    private String blobs_url;
    private String branches_url;
    private String collaborators_url;
    private String comments_url;
    private String commits_url;
    private String compare_url;
    private String contents_url;
    private String contributors_url;
    private String deployments_url;
    private String downloads_url;
    private String events_url;
    private String forks_url;
    private String git_commits_url;
    private String git_refs_url;
    private String git_tags_url;
    private String git_url;
    private String issue_comment_url;
    private String issue_events_url;
    private String issues_url;
    private String keys_url;
    private String labels_url;
    private String languages_url;
    private String merges_url;
    private String milestones_url;
    private String notifications_url;
    private String pulls_url;
    private String releases_url;
    private String ssh_url;
    private String stargazers_url;
    private String statuses_url;
    private String subscribers_url;
    private String subscription_url;
    private String tags_url;
    private String teams_url;
    private String trees_url;
    private String clone_url;
    private String mirror_url;
    private String hooks_url;
    private String svn_url;
    private String homepage;
    private Object language;
    private Integer forks_count;
    private Integer stargazers_count;
    private Integer watchers_count;
    private Integer size;
    private String default_branch;
    private Integer open_issues_count;
    private Boolean is_template;
    private List<String> topics = null;
    private Boolean has_issues;
    private Boolean has_projects;
    private Boolean has_wiki;
    @JsonIgnore
    private Map<String, Object> additionalProperties = new HashMap<String, Object>();

}

主类

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;

import java.nio.file.Files;
import java.nio.file.Paths;

public class JSONPractise {
    public static void main(String[] args) throws Exception {

        String file = "DataFile.json";
        String jsonStr = readFileAsString(file);
        ObjectMapper mapper = new ObjectMapper();
        Example example =  mapper.readValue(jsonStr, Example.class);
        RepositoryDetailsDTO repositoryDetailsDTO = new RepositoryDetailsDTO();
        BeanUtils.copyProperties(repositoryDetailsDTO, example);

        System.out.println(example.toString());
        System.out.println(repositoryDetailsDTO.toString());
    }
    public static String readFileAsString(String file)throws Exception
    {
        return new String(Files.readAllBytes(Paths.get(file)));
    }
}

输出：

Example(id=1296269, node_id=MDEwOlJlcG9zaXRvcnkxMjk2MjY5, name=Hello-World, full_name=octocat/Hello-World, owner=Owner(login=octocat, id=1, nodeId=MDQ6VXNlcjE=, avatarUrl=https://github.com/images/error/octocat_happy.gif, gravatarId=, url=https://api.github.com/users/octocat, htmlUrl=https://github.com/octocat, followersUrl=https://api.github.com/users/octocat/followers, followingUrl=https://api.github.com/users/octocat/following{/other_user}, gistsUrl=https://api.github.com/users/octocat/gists{/gist_id}, starredUrl=https://api.github.com/users/octocat/starred{/owner}{/repo}, subscriptionsUrl=https://api.github.com/users/octocat/subscriptions, organizationsUrl=https://api.github.com/users/octocat/orgs, reposUrl=https://api.github.com/users/octocat/repos, eventsUrl=https://api.github.com/users/octocat/events{/privacy}, receivedEventsUrl=https://api.github.com/users/octocat/received_events, type=User, siteAdmin=false, additionalProperties={}), _private=false, html_url=https://github.com/octocat/Hello-World, description=This your first repo!, fork=false, url=https://api.github.com/repos/octocat/Hello-World, archive_url=https://api.github.com/repos/octocat/Hello-World/{archive_format}{/ref}, assignees_url=https://api.github.com/repos/octocat/Hello-World/assignees{/user}, blobs_url=https://api.github.com/repos/octocat/Hello-World/git/blobs{/sha}, branches_url=https://api.github.com/repos/octocat/Hello-World/branches{/branch}, collaborators_url=https://api.github.com/repos/octocat/Hello-World/collaborators{/collaborator}, comments_url=https://api.github.com/repos/octocat/Hello-World/comments{/number}, commits_url=https://api.github.com/repos/octocat/Hello-World/commits{/sha}, compare_url=https://api.github.com/repos/octocat/Hello-World/compare/{base}...{head}, contents_url=https://api.github.com/repos/octocat/Hello-World/contents/{+path}, contributors_url=https://api.github.com/repos/octocat/Hello-World/contributors, deployments_url=https://api.github.com/repos/octocat/Hello-World/deployments, downloads_url=https://api.github.com/repos/octocat/Hello-World/downloads, events_url=https://api.github.com/repos/octocat/Hello-World/events, forks_url=https://api.github.com/repos/octocat/Hello-World/forks, git_commits_url=https://api.github.com/repos/octocat/Hello-World/git/commits{/sha}, git_refs_url=https://api.github.com/repos/octocat/Hello-World/git/refs{/sha}, git_tags_url=https://api.github.com/repos/octocat/Hello-World/git/tags{/sha}, git_url=git:github.com/octocat/Hello-World.git, issue_comment_url=https://api.github.com/repos/octocat/Hello-World/issues/comments{/number}, issue_events_url=https://api.github.com/repos/octocat/Hello-World/issues/events{/number}, issues_url=https://api.github.com/repos/octocat/Hello-World/issues{/number}, keys_url=https://api.github.com/repos/octocat/Hello-World/keys{/key_id}, labels_url=https://api.github.com/repos/octocat/Hello-World/labels{/name}, languages_url=https://api.github.com/repos/octocat/Hello-World/languages, merges_url=https://api.github.com/repos/octocat/Hello-World/merges, milestones_url=https://api.github.com/repos/octocat/Hello-World/milestones{/number}, notifications_url=https://api.github.com/repos/octocat/Hello-World/notifications{?since,all,participating}, pulls_url=https://api.github.com/repos/octocat/Hello-World/pulls{/number}, releases_url=https://api.github.com/repos/octocat/Hello-World/releases{/id}, ssh_url=git@github.com:octocat/Hello-World.git, stargazers_url=https://api.github.com/repos/octocat/Hello-World/stargazers, statuses_url=https://api.github.com/repos/octocat/Hello-World/statuses/{sha}, subscribers_url=https://api.github.com/repos/octocat/Hello-World/subscribers, subscription_url=https://api.github.com/repos/octocat/Hello-World/subscription, tags_url=https://api.github.com/repos/octocat/Hello-World/tags, teams_url=https://api.github.com/repos/octocat/Hello-World/teams, trees_url=https://api.github.com/repos/octocat/Hello-World/git/trees{/sha}, clone_url=https://github.com/octocat/Hello-World.git, mirror_url=git:git.example.com/octocat/Hello-World, hooks_url=https://api.github.com/repos/octocat/Hello-World/hooks, svn_url=https://svn.github.com/octocat/Hello-World, homepage=https://github.com, language=null, forks_count=9, stargazers_count=80, watchers_count=80, size=108, default_branch=master, open_issues_count=0, is_template=false, topics=[octocat, atom, electron, api], has_issues=true, has_projects=true, has_wiki=true, additionalProperties={})
RepositoryDetailsDTO(full_name=octocat/Hello-World, description=This your first repo!, clone_url=https://github.com/octocat/Hello-World.git, stars=null, createdAt=null)

---

我可能错过了什么。。。。但是你考虑过使用Jackson（注释）吗？哪种注释？你能扩展吗？谢谢你的回答，但我想避免创建超过1个pojo类，因为我只需要4个变量的pojo。但你的建议可能会在将来对我有所帮助：）

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;

import java.util.HashMap;
import java.util.Map;

@Data
public class Owner {

@JsonProperty("login")
private String login;
@JsonProperty("id")
private Integer id;
@JsonProperty("node_id")
private String nodeId;
@JsonProperty("avatar_url")
private String avatarUrl;
@JsonProperty("gravatar_id")
private String gravatarId;
@JsonProperty("url")
private String url;
@JsonProperty("html_url")
private String htmlUrl;
@JsonProperty("followers_url")
private String followersUrl;
@JsonProperty("following_url")
private String followingUrl;
@JsonProperty("gists_url")
private String gistsUrl;
@JsonProperty("starred_url")
private String starredUrl;
@JsonProperty("subscriptions_url")
private String subscriptionsUrl;
@JsonProperty("organizations_url")
private String organizationsUrl;
@JsonProperty("repos_url")
private String reposUrl;
@JsonProperty("events_url")
private String eventsUrl;
@JsonProperty("received_events_url")
private String receivedEventsUrl;
@JsonProperty("type")
private String type;
@JsonProperty("site_admin")
private Boolean siteAdmin;
@JsonIgnore
private Map<String, Object> additionalProperties = new HashMap<String, Object>();

import lombok.Data;

@Data
public class RepositoryDetailsDTO {
    String full_name;
    String description;
    String clone_url;
    String stars;
    String createdAt;
}

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;

import java.nio.file.Files;
import java.nio.file.Paths;

public class JSONPractise {
    public static void main(String[] args) throws Exception {

        String file = "DataFile.json";
        String jsonStr = readFileAsString(file);
        ObjectMapper mapper = new ObjectMapper();
        Example example =  mapper.readValue(jsonStr, Example.class);
        RepositoryDetailsDTO repositoryDetailsDTO = new RepositoryDetailsDTO();
        BeanUtils.copyProperties(repositoryDetailsDTO, example);

        System.out.println(example.toString());
        System.out.println(repositoryDetailsDTO.toString());
    }
    public static String readFileAsString(String file)throws Exception
    {
        return new String(Files.readAllBytes(Paths.get(file)));
    }
}

Example(id=1296269, node_id=MDEwOlJlcG9zaXRvcnkxMjk2MjY5, name=Hello-World, full_name=octocat/Hello-World, owner=Owner(login=octocat, id=1, nodeId=MDQ6VXNlcjE=, avatarUrl=https://github.com/images/error/octocat_happy.gif, gravatarId=, url=https://api.github.com/users/octocat, htmlUrl=https://github.com/octocat, followersUrl=https://api.github.com/users/octocat/followers, followingUrl=https://api.github.com/users/octocat/following{/other_user}, gistsUrl=https://api.github.com/users/octocat/gists{/gist_id}, starredUrl=https://api.github.com/users/octocat/starred{/owner}{/repo}, subscriptionsUrl=https://api.github.com/users/octocat/subscriptions, organizationsUrl=https://api.github.com/users/octocat/orgs, reposUrl=https://api.github.com/users/octocat/repos, eventsUrl=https://api.github.com/users/octocat/events{/privacy}, receivedEventsUrl=https://api.github.com/users/octocat/received_events, type=User, siteAdmin=false, additionalProperties={}), _private=false, html_url=https://github.com/octocat/Hello-World, description=This your first repo!, fork=false, url=https://api.github.com/repos/octocat/Hello-World, archive_url=https://api.github.com/repos/octocat/Hello-World/{archive_format}{/ref}, assignees_url=https://api.github.com/repos/octocat/Hello-World/assignees{/user}, blobs_url=https://api.github.com/repos/octocat/Hello-World/git/blobs{/sha}, branches_url=https://api.github.com/repos/octocat/Hello-World/branches{/branch}, collaborators_url=https://api.github.com/repos/octocat/Hello-World/collaborators{/collaborator}, comments_url=https://api.github.com/repos/octocat/Hello-World/comments{/number}, commits_url=https://api.github.com/repos/octocat/Hello-World/commits{/sha}, compare_url=https://api.github.com/repos/octocat/Hello-World/compare/{base}...{head}, contents_url=https://api.github.com/repos/octocat/Hello-World/contents/{+path}, contributors_url=https://api.github.com/repos/octocat/Hello-World/contributors, deployments_url=https://api.github.com/repos/octocat/Hello-World/deployments, downloads_url=https://api.github.com/repos/octocat/Hello-World/downloads, events_url=https://api.github.com/repos/octocat/Hello-World/events, forks_url=https://api.github.com/repos/octocat/Hello-World/forks, git_commits_url=https://api.github.com/repos/octocat/Hello-World/git/commits{/sha}, git_refs_url=https://api.github.com/repos/octocat/Hello-World/git/refs{/sha}, git_tags_url=https://api.github.com/repos/octocat/Hello-World/git/tags{/sha}, git_url=git:github.com/octocat/Hello-World.git, issue_comment_url=https://api.github.com/repos/octocat/Hello-World/issues/comments{/number}, issue_events_url=https://api.github.com/repos/octocat/Hello-World/issues/events{/number}, issues_url=https://api.github.com/repos/octocat/Hello-World/issues{/number}, keys_url=https://api.github.com/repos/octocat/Hello-World/keys{/key_id}, labels_url=https://api.github.com/repos/octocat/Hello-World/labels{/name}, languages_url=https://api.github.com/repos/octocat/Hello-World/languages, merges_url=https://api.github.com/repos/octocat/Hello-World/merges, milestones_url=https://api.github.com/repos/octocat/Hello-World/milestones{/number}, notifications_url=https://api.github.com/repos/octocat/Hello-World/notifications{?since,all,participating}, pulls_url=https://api.github.com/repos/octocat/Hello-World/pulls{/number}, releases_url=https://api.github.com/repos/octocat/Hello-World/releases{/id}, ssh_url=git@github.com:octocat/Hello-World.git, stargazers_url=https://api.github.com/repos/octocat/Hello-World/stargazers, statuses_url=https://api.github.com/repos/octocat/Hello-World/statuses/{sha}, subscribers_url=https://api.github.com/repos/octocat/Hello-World/subscribers, subscription_url=https://api.github.com/repos/octocat/Hello-World/subscription, tags_url=https://api.github.com/repos/octocat/Hello-World/tags, teams_url=https://api.github.com/repos/octocat/Hello-World/teams, trees_url=https://api.github.com/repos/octocat/Hello-World/git/trees{/sha}, clone_url=https://github.com/octocat/Hello-World.git, mirror_url=git:git.example.com/octocat/Hello-World, hooks_url=https://api.github.com/repos/octocat/Hello-World/hooks, svn_url=https://svn.github.com/octocat/Hello-World, homepage=https://github.com, language=null, forks_count=9, stargazers_count=80, watchers_count=80, size=108, default_branch=master, open_issues_count=0, is_template=false, topics=[octocat, atom, electron, api], has_issues=true, has_projects=true, has_wiki=true, additionalProperties={})
RepositoryDetailsDTO(full_name=octocat/Hello-World, description=This your first repo!, clone_url=https://github.com/octocat/Hello-World.git, stars=null, createdAt=null)