如何使用 Java 在 Spring 引导中创建父子 Json 响应

Question

我正在尝试从 Spring 引导应用程序创建一个 json 响应，其中枚举的名称将是父结构，并且所有子结构都将居住在该名称之下。 我创建的只是显示子层次结构，但我也想要父级。就像我想要的下面

items: [
  {
    title: "ABC ",
    subTitle: "",
    description:
         "123  ",
    url: "",
  },
  {
    title: "Revenue",
    subTitle: "",
    description:
      "Digitally ",
    url: "",
  },
  {
    title: "xyz",
    subTitle: "",
    description:
      "345,",
    url: "stackoverflow.com",
  },
  {
    title: "kji",
    subTitle: "",
    description:
      "890",
    url: "",
  },
  {
    title: "KOI",
    subTitle: "",
    description:
      "054,",
    url: "",
  },
]

我得到的是

[
  {
    title: "ABC ",
    subTitle: "",
    description:
         "123  ",
    url: "",
  },
  {
    title: "Revenue",
    subTitle: "",
    description:
      "Digitally ",
    url: "",
  },
  {
    title: "xyz",
    subTitle: "",
    description:
      "345,",
    url: "stackoverflow.com",
  },
  {
    title: "kji",
    subTitle: "",
    description:
      "890",
    url: "",
  },
  {
    title: "KOI",
    subTitle: "",
    description:
      "054,",
    url: "",
  },
]

以下是我使用过的代码

import java.util.Arrays;
import java.util.List;

 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;

 @RestController
 public class EnumController {

@GetMapping("/getEnumResponse")
public List<TreeEnum> getCurrentContent() {
    MyData  mData = new MyData ();
   return Arrays.asList(TreeEnum.values());
    
    } 

   }



import com.fasterxml.jackson.annotation.JsonFormat;

@JsonFormat(shape=JsonFormat.Shape.OBJECT)
public enum TreeEnum {
VALUE1 ("Pay","","Digitally.",""),
VALUE2 ("Revenue","","enable",""),
VALUE3("Banking","","Treasury Reporting etc","CHOICE"),
VALUE4("Accounting","","Corporate","");

private String title;
private String subTitle;
private  String url;
private String description;

Response(String title,String subTitle,String description,String url) {
    this.title = title;
    this.subTitle = subTitle;
    this.description = description;
    this.url = url;
    
}

public String getTitle() {
    return title;
}


public String getSubTitle() {
    return subTitle;
}

public String getUrl() {
    return url;
}

public String getDescription() {
    return description;
    }
  

   }







import java.util.List;

 public class MyData {
 private List<TreeEnum > responses;

  public List<TreeEnum > getResponses() {
    return responses;
  }

    public void setResponses(List<Response> responses) {
    this.responses = responses;
     }
  }

Answer 1

您正在返回项目的集合，您需要返回 object 以及包含 collections 的属性项目。

这可以通过 Map 来实现。

@GetMapping("/getEnumResponse")
public Map getCurrentContent() {
   Map response = new HashMap();
   response.put("items", TreeEnum.values());
   return response;
} 

如果您使用的是 Java9 或更高版本，您可以这样做

@GetMapping("/getEnumResponse")
public Map getCurrentContent() {
   return Map.of("items", TreeEnum.values());
} 

Answer 2

创建一个 ItemDto 并在其中传递 TreeEnum 列表。 你也可以使用 @JsonRootName("Item") 如果你不想列出并在你的映射中启用根值 mapper.enable(SerializationFeature.WRAP_ROOT_VALUE);