无法获取jersey 2应用程序以使用自定义杰克逊XmlMapper

Question

我正在使用Jersey 2.22.1和Jackson 2.6.3编写Web应用程序。我的pom.xml看起来像这样：

<!-- JERSEY -->
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-client</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-jackson</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-multipart</artifactId>
        <version>2.22.1</version>
    </dependency>
    <dependency>
        <groupId>asm</groupId>
        <artifactId>asm</artifactId>
        <version>3.3.1</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.woodstox</groupId>
        <artifactId>woodstox-core-asl</artifactId>
        <version>4.4.1</version>
    </dependency>
    <!-- JACKSON -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>2.6.3</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.dataformat</groupId>
        <artifactId>jackson-dataformat-xml</artifactId>
        <version>2.6.3</version>
    </dependency>

目标是将不同的自定义ObjectMappers用于JSON和XML映射。我创建了两个提供程序类：JSONMapperProvider

    @Provider
    @Produces(MediaType.APPLICATION_JSON)
    public class JSONMapperProvider implements ContextResolver<ObjectMapper> {
    private static ObjectMapper objectMapper;

    public JSONMapperProvider() {
    init();
    }

    public static void init() {
    if (objectMapper == null) {
        objectMapper = new ObjectMapper();
        // SERIALIZATION
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
            .configure(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS, false)
            .setSerializationInclusion(Include.NON_NULL)
            .setSerializationInclusion(Include.NON_EMPTY);
        // DESERIALIZATION
        objectMapper.configure(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS, true)
            .configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        // set up ISO 8601 date/time stamp format:
        ObjectMapperProvider.DATE_FORMAT_ISO8601.setTimeZone(TimeZone.getTimeZone("GMT"));
        objectMapper.setDateFormat(ObjectMapperProvider.DATE_FORMAT_ISO8601);
        // Custom deserializer for date which helps deserialization of date
        // without time
        SimpleModule dateDeserializerModule = new SimpleModule("DateDeserializerModule", Version.unknownVersion());
        dateDeserializerModule.addDeserializer(Date.class, new CustomJsonDateDeserializer());
        //objectMapper.registerModule(dateDeserializerModule);
    }
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
    System.out.println("JSONMapperProvider.getContext() called with type: "
        + type);
    return objectMapper;
    }

    private static class CustomJsonDateDeserializer extends JsonDeserializer<Date> {
    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext deserializationcontext) throws IOException, JsonProcessingException {
        String date = jsonparser.getText();
        try {
        return DateUtil.parseDate(date);
        } catch (ParseException e) {
        throw new RuntimeException(e);
        }
    }
    }
}

和XMLMapperProvider

    @Provider
    @Produces({ MediaType.APPLICATION_XML })
    public class XMLMapperProvider implements ContextResolver<ObjectMapper>     {

    private static ObjectMapper objectMapper;

    public XMLMapperProvider() {
    init();
    }

    public static void init() {
    if (objectMapper == null) {
        JacksonXmlModule module = new JacksonXmlModule();
        module.setDefaultUseWrapper(false);
        objectMapper = new XmlMapper(module);
        // SERIALIZATION
        objectMapper.configure(SerializationFeature.INDENT_OUTPUT, true)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
            .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
            .configure(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS, false)
            .setSerializationInclusion(Include.NON_NULL)
            .setSerializationInclusion(Include.NON_EMPTY);
        // DESERIALIZATION
        objectMapper.configure(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS, true)
            .configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
        // set up ISO 8601 date/time stamp format:
        ObjectMapperProvider.DATE_FORMAT_ISO8601.setTimeZone(TimeZone.getTimeZone("GMT"));
        objectMapper.setDateFormat(ObjectMapperProvider.DATE_FORMAT_ISO8601);
        // Custom deserializer for date which helps deserialization of date
        // without time
        SimpleModule dateDeserializerModule = new SimpleModule("DateDeserializerModule", Version.unknownVersion());
        dateDeserializerModule.addDeserializer(Date.class, new CustomJsonDateDeserializer());
        objectMapper.registerModule(dateDeserializerModule);
    }
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
    System.out.println("XMLMapperProvider.getContext() called with type: "
        + type);
    return objectMapper;
    }

    private static class CustomJsonDateDeserializer extends JsonDeserializer<Date> {
    @Override
    public Date deserialize(JsonParser jsonparser, DeserializationContext deserializationcontext) throws IOException, JsonProcessingException {
        String date = jsonparser.getText();
        try {
        return DateUtil.parseDate(date);
        } catch (ParseException e) {
        throw new RuntimeException(e);
        }
    }
    }
}

它们都在同一包中，并在Application资源类中注册

@ApplicationPath("resources")
public class CCRestResources extends ResourceConfig {
    public CCRestResources() {
        register(JacksonFeature.class);
        packages("com.cc.rest.jersey");
    }
}

如果我向@Produces（MediaType.APPLICATION_JSON）的方法发出GET请求，则一切正常，并使用了我的自定义映射器。但是，如果我提出相同的要求，请@Produces（MediaType.APPLICATION_XML）应用程序使用某些默认映射器，而不是我的自定义映射器。如果您有任何想法请帮助。谢谢！

Answer 1

有几件事。首先，您不仅需要核心Jackson
xml依赖项，还需要实际的jaxrs提供程序

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-xml-provider</artifactId>
    <version>${jackson2.version}</version>
</dependency>

然后，您应该排除JAXB提供程序，这是Jersey所使用的默认提供程序。（我在测试时保留它没有问题，但是如果您不打算使用它，我将排除它）。它是由jersey- server插入的，因此您应明确声明jersey-server并jersey-media-jaxb从中排除

<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-server</artifactId>
    <version>${jersey2.version}</version>
    <exclusions>
        <exclusion>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-jaxb</artifactId>
        </exclusion>
    </exclusions>
</dependency>

然后，您将需要注册JacksonJaxbXMLProvider（或JacksonXMLProvider不需要或计划使用JAXB批注的）。

public CCRestResources() {
    register(JacksonFeature.class);
    register(JacksonJaxbXMLProvider.class);
    packages("com.cc.rest.jersey");
}

最后，您需要将参数ContextResolver化为XmlMapper类型，而不是ObjectMapper。可以看出这里的供应商寻找一ContextResolver对XmlMapper，没有ObjectMapper。