Question

我需要为休息服务显示以下类型的Json响应：

{
    "Server up": false,
    "database running": true,
    "dependency 1 up": true
}

为此，我定义了Java对象HealthCheckResponse.java，它有一个map字段。

public class HealthCheckResponse {
    @JsonProperty
    private Map<String, Boolean> statusMap;

    public Map<String, Boolean> getStatusMap() {
        return statusMap;
    }
    public void setStatusMap(Map<String, Boolean> statusMap) {
        statusMap = statusMap;
    }}

但是当我打印最终答案时，它也会出现在地图字段的名称中。

{
   "statusMap":
   {
       "Server up": false,
"database running": true,
"dependency 1 up": true
   }
}

请建议我需要在HealthCheckResponse.java中进行更改，以摆脱＆＃34; statusMap＆＃34;和输出显示中的额外花括号。这是我正在使用的对象映射器：

public class CustomObjectMapper extends ObjectMapper {

    public CustomObjectMapper() {
        super();

        configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        setVisibilityChecker(getSerializationConfig().getDefaultVisibilityChecker().withFieldVisibility(JsonAutoDetect.Visibility.NONE)
.withGetterVisibility(JsonAutoDetect.Visibility.NONE).withSetterVisibility(JsonAutoDetect.Visibility.NONE)
.withCreatorVisibility(JsonAutoDetect.Visibility.NONE).withIsGetterVisibility(JsonAutoDetect.Visibility.NONE));

        setSerializationInclusion(Include.NON_NULL);

        registerModule(new StringModule());
        registerModule(new GuavaModule());
    }
}

Answer 1

我相信@JsonValue可以在这里提供帮助。如果您将响应更改为以下内容：

public class HealthCheckResponse {
    private Map<String, Boolean> statusMap;

    @JsonValue
    public Map<String, Boolean> getStatusMap() {
        return statusMap;
    }

    public void setStatusMap(Map<String, Boolean> statusMap) {
        this.statusMap = statusMap;
    }
}

// The mapper can be used like this
final ObjectMapper mapper = new ObjectMapper();

// The POJO
final HealthCheckResponse healthCheckResponse = new HealthCheckResponse();
final Map<String, Boolean> statusMap = new HashMap<>();
statusMap.put("Server up", false);
statusMap.put("database running", true);
statusMap.put("dependency 1 up", true);
healthCheckResponse.setStatusMap(statusMap);

System.out.println(mapper.writeValueAsString(healthCheckResponse));

并且输出将是：

{＆＃34; Server up＆＃34;：false，＆＃34;数据库正在运行＆＃34;：true，＆＃34;依赖1 up＆＃34;：true}

Answer 2

您应该使用@JsonValue和@JsonAnySetter批注：

public class HealthCheckResponse {

    private Map<String, Boolean> statusMap = new HashMap<>();

    @JsonValue
    public Map<String, Boolean> getStatusMap() {
        return statusMap;
    }

    @JsonAnySetter
    public void add(String key, Boolean value) {
        statusMap.put(key, value);
    }
}

并使用：

   ObjectMapper objectMapper = new ObjectMapper();

    HealthCheckResponse healthCheckResponse = new HealthCheckResponse();
    healthCheckResponse.add("Server up", false);
    healthCheckResponse.add("database running", true);
    healthCheckResponse.add("dependency 1 up", true);

    String json = objectMapper.writeValueAsString(healthCheckResponse);
    System.out.println(json);

    HealthCheckResponse object = objectMapper.readerFor(HealthCheckResponse.class).readValue(json);
    System.out.println(object.getStatusMap());

将地图序列化为json，而不使用Jackson显示输出中的地图名称

2 个答案: