如何从json响应中动态删除字段？

  • Z时代
  • 2024-01-10
  • 分类：问答

我正在使用spring创建一个宁静的api，到目前为止，我的问题是如何动态建模响应的字段？

那就是我正在使用的控制器：

@Controller
public class AlbumController {
@Autowired
private MusicService musicService;
@RequestMapping(value = "/albums", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Collection<Resource<Album>> getAllAlbums() {
    Collection<Album> albums = musicService.getAllAlbums();
    List<Resource<Album>> resources = new ArrayList<Resource<Album>>();
    for (Album album : albums) {
        resources.add(this.getAlbumResource(album));
    }
    return resources;
}
@RequestMapping(value = "/album/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Resource<Album> getAlbum(@PathVariable(value = "id") String id) {
    Album album = musicService.getAlbum(id);
    return getAlbumResource(album);
}
private Resource<Album> getAlbumResource(Album album) {
    Resource<Album> resource = new Resource<Album>(album);
    // Link to Album
    resource.add(linkTo(methodOn(AlbumController.class).getAlbum(album.getId())).withSelfRel());
    // Link to Artist
    resource.add(linkTo(methodOn(ArtistController.class).getArtist(album.getArtist().getId())).withRel("artist"));
    // Option to purchase Album
    if (album.getStockLevel() > 0) {
        resource.add(linkTo(methodOn(AlbumController.class).purchaseAlbum(album.getId())).withRel("album.purchase"));
    }
    return resource;
}
@RequestMapping(value = "/album/purchase/{id}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public Resource<Album> purchaseAlbum(@PathVariable(value = "id") String id) {
    Album a = musicService.getAlbum(id);
    a.setStockLevel(a.getStockLevel() - 1);
    Resource<Album> resource = new Resource<Album>(a);
    resource.add(linkTo(methodOn(AlbumController.class).getAlbum(id)).withSelfRel());
    return resource;
}
}

和模型：

public class Album {
private final String id;
private final String title;
private final Artist artist;
private int stockLevel;
public Album(final String id, final String title, final Artist artist, int stockLevel) {
    this.id = id;
    this.title = title;
    this.artist = artist;
    this.stockLevel = stockLevel;
}
public String getId() {
    return id;
}
public String getTitle() {
    return title;
}
public Artist getArtist() {
    return artist;
}
public int getStockLevel() {
    return stockLevel;
}
public void setStockLevel(int stockLevel) {
    this.stockLevel = stockLevel;
}
}

回答：

我也在为此要求而苦苦挣扎。

我正在使用Spring Boot 1.2.3。

Views.java

package demo;
public class Views {
    static interface Public {}
    static interface Internal extends Public {}
}

album.java

package demo;
import com.fasterxml.jackson.annotation.JsonView;
public class Album {
    @JsonView(Views.Public.class)
    private String id;
    @JsonView(Views.Public.class)
    private String title;
    @JsonView(Views.Public.class)
    private String artist;
    @JsonView(Views.Internal.class)
    private String secret;
    public Album(String id, String title, String artist, String secret) {
        this.id = id;
        this.title = title;
        this.artist = artist;
        this.secret = secret;
    }
}

AlbumController.java

package demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;
@RestController
public class AlbumController {
    @Autowired
    ObjectMapper mapper;
    @RequestMapping(value = "/album", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public String getAlbum() throws JsonProcessingException {
        Album foo = new Album("1", "foo", "John Doe", "secretProperty");
        // replace the following value with runtime logic of your choice,
        // e.g. role of a user
        boolean forInternal = false;
        ObjectWriter viewWriter;
        if (forInternal) {
            viewWriter = mapper.writerWithView(Views.Internal.class);
        } else {
            viewWriter = mapper.writerWithView(Views.Public.class);
        }
        return viewWriter.writeValueAsString(foo);
    }
}

因此，关键是使用杰克逊的ObjectMapper和ObjectWriter生成对象的json表示形式的

。

对我来说有点丑陋，但是有效。当然，问题仍然在于定义多个时如何缩放RequestMapping。

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