如何在不知道键的情况下动态地将嵌套的 Json object/array 转换为基于键的多个列表

Question

The below is a sample Json file.

{"Yjson":
[
{
"Name": "crunchify.com",
    "Author": "App Shah",
    "Address": "New York",
    "Company Services": [{
        "Service": "Site SEO Review",
        "Link": "https://crunchify.com/services/site-seo-review-service/"
    }, {
        "Service": "Full Website Design Service",
        "Link": "https://crunchify.com/services/full-website-design-service/"
    }, {
        "Service": "WordPress Optimization & Consultation",
        "Link": "https://crunchify.com/services/wordpress-optimization-service/"
    }, {
        "Service": "WordPress Optimization & Consultation",
        "Link": "https://crunchify.com/services/wordpress-optimization-service/"
    }]
},
{
    "Name": "xyz.com",
    "Author": "xyz Shah",
    "Address": "toronto",
    "Company Services": [{
        "Service": "Site SEO Review",
        "Link": "https://crunchify.com/services/site-seo-review-service/"
    }, {
        "Service": "Full Website Design Service",
        "Link": "https://crunchify.com/services/full-website-design-service/"
    }, {
        "Service": "WordPress Optimization & Consultation",
        "Link": "https://crunchify.com/services/wordpress-optimization-service/"
    }]
}
]
}

How to store all the values of each key in a Arraylist in java ?

例如键名数组列表将包含[crunchicy.com,xyz.com]。同样，每个键都应该有一个数组列表。

示例：

列表名称：[crunchify.com,xyz]
列表作者：[aap shah,xyz shah]
列表名称：[纽约，多伦多]

How to parse every json object that can be nested and dynamic in nature and keep them in array lists according to keys ??

Answer 1

这是使用 Jackson Databind and writing it to CSV using Apache Commons CSV.

阅读您的 JSON 文本的代码

使用 Databind 时，您需要 Java POJO 类，可选择使用 @JsonProperty 注释以指定 JSON 字段名称。

您的 JSON 文本内嵌在底部以生成 MCVE。

import java.util.List;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Test {
    public static void main(String[] args) throws Exception {
        Root root = new ObjectMapper().readValue(Input.json, Root.class);
        CSVPrinter printer = CSVFormat.DEFAULT
                                      .withHeader("Name", "Author", "Address", "Service", "Link")
                                      .print(System.out);
        for (Site site : root.getSites())
            for (Service service : site.getServices())
                printer.printRecord(site.getName(), site.getAuthor(), site.getAddress(),
                                    service.getService(), service.getLink());
    }
}
class Root {
    private List<Site> sites;

    @JsonProperty("Yjson")
    public List<Site> getSites() {
        return this.sites;
    }
    public void setSites(List<Site> sites) {
        this.sites = sites;
    }
}
class Site {
    private String        name;
    private String        author;
    private String        address;
    private List<Service> services;

    @JsonProperty("Name")
    public String getName() {
        return this.name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @JsonProperty("Author")
    public String getAuthor() {
        return this.author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }

    @JsonProperty("Address")
    public String getAddress() {
        return this.address;
    }
    public void setAddress(String address) {
        this.address = address;
    }

    @JsonProperty("Company Services")
    public List<Service> getServices() {
        return this.services;
    }
    public void setServices(List<Service> services) {
        this.services = services;
    }
}
class Service {
    private String service;
    private String link;

    @JsonProperty("Service")
    public String getService() {
        return this.service;
    }
    public void setService(String service) {
        this.service = service;
    }

    @JsonProperty("Link")
    public String getLink() {
        return this.link;
    }
    public void setLink(String link) {
        this.link = link;
    }
}
class Input {
    static final String json =
        "{\"Yjson\":\n" +
        "[\n" +
        "{\n" +
        "\"Name\": \"crunchify.com\",\n" +
        "    \"Author\": \"App Shah\",\n" +
        "    \"Address\": \"New York\",\n" +
        "    \"Company Services\": [{\n" +
        "        \"Service\": \"Site SEO Review\",\n" +
        "        \"Link\": \"https://crunchify.com/services/site-seo-review-service/\"\n" +
        "    }, {\n" +
        "        \"Service\": \"Full Website Design Service\",\n" +
        "        \"Link\": \"https://crunchify.com/services/full-website-design-service/\"\n" +
        "    }, {\n" +
        "        \"Service\": \"WordPress Optimization & Consultation\",\n" +
        "        \"Link\": \"https://crunchify.com/services/wordpress-optimization-service/\"\n" +
        "    }, {\n" +
        "        \"Service\": \"WordPress Optimization & Consultation\",\n" +
        "        \"Link\": \"https://crunchify.com/services/wordpress-optimization-service/\"\n" +
        "    }]\n" +
        "},\n" +
        "{\n" +
        "    \"Name\": \"xyz.com\",\n" +
        "    \"Author\": \"xyz Shah\",\n" +
        "    \"Address\": \"toronto\",\n" +
        "    \"Company Services\": [{\n" +
        "        \"Service\": \"Site SEO Review\",\n" +
        "        \"Link\": \"https://crunchify.com/services/site-seo-review-service/\"\n" +
        "    }, {\n" +
        "        \"Service\": \"Full Website Design Service\",\n" +
        "        \"Link\": \"https://crunchify.com/services/full-website-design-service/\"\n" +
        "    }, {\n" +
        "        \"Service\": \"WordPress Optimization & Consultation\",\n" +
        "        \"Link\": \"https://crunchify.com/services/wordpress-optimization-service/\"\n" +
        "    }]\n" +
        "}\n" +
        "]\n" +
        "}";
}

输出

Name,Author,Address,Service,Link
crunchify.com,App Shah,New York,Site SEO Review,https://crunchify.com/services/site-seo-review-service/
crunchify.com,App Shah,New York,Full Website Design Service,https://crunchify.com/services/full-website-design-service/
crunchify.com,App Shah,New York,WordPress Optimization & Consultation,https://crunchify.com/services/wordpress-optimization-service/
crunchify.com,App Shah,New York,WordPress Optimization & Consultation,https://crunchify.com/services/wordpress-optimization-service/
xyz.com,xyz Shah,toronto,Site SEO Review,https://crunchify.com/services/site-seo-review-service/
xyz.com,xyz Shah,toronto,Full Website Design Service,https://crunchify.com/services/full-website-design-service/
xyz.com,xyz Shah,toronto,WordPress Optimization & Consultation,https://crunchify.com/services/wordpress-optimization-service/

如果您使用 Maven，这些是您需要的两个依赖项：

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.0</version>
</dependency>
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-csv</artifactId>
    <version>1.4</version>
</dependency>

如何在不知道键的情况下动态地将嵌套的 Json object/array 转换为基于键的多个列表

How to converting a nested Json object/array to multiple lists based on keys Dynamically without knowing the keys

java

json

jackson

gson

jsonobject