相关疑难解决方法(0)

我的目标是配置objectMapper它只序列化带注释的元素@JsonProperty.

为了做到这一点,我按照这个解释说明了如何配置对象映射器.

我在这里描述了自定义objectmapper .

但是,当NumbersOfNewEvents序列化类时,它仍然包含json中的所有属性.

有人有提示吗？提前致谢

杰克逊1.8.0春季3.0.5

CustomObjectMapper

public class CompanyObjectMapper extends ObjectMapper {
    public CompanyObjectMapper() {
        super();
        setVisibilityChecker(getSerializationConfig()
                .getDefaultVisibilityChecker()
                .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)
                .withFieldVisibility(JsonAutoDetect.Visibility.NONE)
                .withGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withIsGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withSetterVisibility(JsonAutoDetect.Visibility.DEFAULT));
    }
}

servlet.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="de.Company.backend.web" />

    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                    <property name="objectMapper" ref="jacksonObjectMapper" />
                </bean>
            </list>
        </property>
    </bean>

    <bean id="jacksonObjectMapper" class="de.Company.backend.web.CompanyObjectMapper" />
</beans>

NumbersOfNewEvents

public class …

我有一个使用嵌入式tomcat服务器运行的spring启动应用程序.我部分成功地将springfox-swagger与应用程序集成在一起.如果我执行/ v2/api-docs,我可以在webapp中查看所有api的所有文档.但是,当我尝试从UI访问相同时,它不起作用.以下是详细结果.

输出 - localhost:8080/api/swagger-resources

[ {
  "name" : "default",
  "location" : "/v2/api-docs",
  "swaggerVersion" : "2.0"
} ]

输出 - localhost:8080/api/v2/api-docs

I get valid results. I can confirm that and the output is too large to paste here

但是当我尝试访问swagger-ui时,它不起作用.下面是我调用以访问swagger-ui的不同URL.

http://localhost:8080/swagger-ui.html - UI is loading, but no documentation of API's is present
http://localhost:8080/api/swagger-ui.html  - 404 Not Found
http://localhost:8080/springfox - 404 Not Found
http://localhost:8080/api/springfox - 404 Not Found

下面是我的SwaggerConfig.java类

package com.vmware.vrack.lcm;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import …

从 Spring Boot 2.4.5 更新到 Spring 2.5.0 后，我注意到应用程序日志中存在以下异常：

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.Instant` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: org.telegram.telegrambots.meta.api.objects.Update["my_chat_member"]->org.telegram.telegrambots.meta.api.objects.ChatMemberUpdated["new_chat_member"]->org.telegram.telegrambots.meta.api.objects.ChatMember["untilDateAsInstant"])
    at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1276) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.impl.UnsupportedTypeSerializer.serialize(UnsupportedTypeSerializer.java:35) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:770) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:178) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1514) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ObjectWriter._writeValueAndClose(ObjectWriter.java:1215) ~[jackson-databind-2.12.3.jar!/:2.12.3]
    at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:1059) …

我正在使用 springBoot 开发 REST APi。我在 GET 端点的响应模型中有一个 LocalDate 字段“firstDate”。但是这个 LocalDate 可以在响应的 json 中序列化为数组！

"firstDate": [
        2021,
        3,
        1
      ],

因此，为了使用此 APi，我必须在 DTO 中将此日期定义为数组！这不好！我的 API 响应模型是用 swagger 生成的，所以我不能使用 @JsonFormat(pattern="yyyy-MM-dd")

您能帮助我并告诉我在这种情况下如何正确序列化 LocalDate 吗？

非常感谢。

在我的春季启动应用程序中,我使用Jackson通过注入ObjectMapper所需的位置来序列化对象.我找到了这个答案:https://stackoverflow.com/a/32842962/447426 但是这个创建了一个新的映射器 - 带有jacksons默认设置.

另一方面,我在官方文件中发现了这一点.我真的不明白.没有示例代码.

那么如何在Springs默认对象映射器的基础上配置弹簧ObjectMapper？

注入时,此配置应在"ObjectMapper"上处于活动状态.

我有一个设置返回自定义ObjectMapper的类。据我所知，让Spring Boot使用此ObjectMapper的正确方法是将其声明为@Primary。

@Configuration
public class MyJacksonConfiguration {

    @Bean
    @Primary
    public ObjectMapper objectMapper() {
        return Jackson2ObjectMapperBuilder
            .json()
            .findModulesViaServiceLoader(true)
            .mixIn(Throwable.class, ThrowableMixin.class)
            .featuresToDisable(
                    WRITE_DATES_AS_TIMESTAMPS)
            .serializationInclusion(
                    Include.NON_ABSENT)
            .build();
    }
}

但是，当我从控制器方法返回对象时，它将使用默认的Jackson ObjectMapper配置进行序列化。

如果我在控制器上添加一个显式的ObjectMapper并调用writeValueAsString，则可以看到该ObjectMapper是我希望Spring Boot使用的自定义对象。

@RestController
public class TestController {

    @Autowired
    private TestService service;

    @Autowired
    private ObjectMapper mapper;

    @GetMapping(value = "/test", produces = "application/json")
    public TestResult getResult() {

        final TestResult ret = service.getResult();

        String test = "";
        try {
            test = mapper.writeValueAsString(ret);
            // test now contains the value I'd like returned by the controller!
        } …

我想在从AbstractEndpoints派生的端点上使用不同的 jackson ObjectMapper实例（而不是用于其他映射 url 的实例）。