gson 在泽西用格森代替Jackson

k4aesqcs  于 2023-03-23  发布在  其他
关注(0)|答案(5)|浏览(147)

我有一个使用和生成JSON对象的RESTful服务,我希望Jersey使用Gson而不是Jackson。
怎么能这样做...?

cbjzeqam

cbjzeqam1#

您需要编写MessageBodyReaderMessageBodyWriter的自定义实现(可能在同一个类中),并在Jersey注册(如果您使用包扫描,@Provider注解就足够了)-与JacksonJsonProvider非常相似:

@Provider
@Consumes({MediaType.APPLICATION_JSON, "text/json"})
@Produces({MediaType.APPLICATION_JSON, "text/json"})
class GsonJsonProvider implements
    MessageBodyReader<Object>,
    MessageBodyWriter<Object> { ...
rm5edbpk

rm5edbpk2#

你可以在这里找到一个完整的工作示例:https://github.com/DominikAngerer/java-GsonJerseyProvider
将有一个http://eclipsesource.com/blogs/2012/11/02/integrating-gson-into-a-jax-rs-based-application/的工作实现,但有一些新的成就-像GsonUtilExpose只的东西。

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonJerseyProvider implements MessageBodyWriter<Object>,
        MessageBodyReader<Object> {

    private static final String UTF_8 = "UTF-8";

    @Override
    public boolean isReadable(Class<?> type, Type genericType,
            java.lang.annotation.Annotation[] annotations, MediaType mediaType) {
        return true;
    }

    @Override
    public Object readFrom(Class<Object> type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException {
        InputStreamReader streamReader = new InputStreamReader(entityStream,
                UTF_8);
        try {
            return GsonUtil.getInstance().fromJson(streamReader, genericType);
        } catch (com.google.gson.JsonSyntaxException e) {
            // Log exception
        } finally {
            streamReader.close();
        }
        return null;
    }

    @Override
    public boolean isWriteable(Class<?> type, Type genericType,
            Annotation[] annotations, MediaType mediaType) {
        return true;
    }

    @Override
    public long getSize(Object object, Class<?> type, Type genericType,
            Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(Object object, Class<?> type, Type genericType,
            Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> httpHeaders,
            OutputStream entityStream) throws IOException,
            WebApplicationException {
        OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8);
        try {
            GsonUtil.getInstance().toJson(object, genericType, writer);
        } finally {
            writer.close();
        }
    }
}
pxq42qpu

pxq42qpu3#

Payara 4

我很难让我的自定义Gson @Provider与GlassFish / Payara中嵌入的Jersey一起工作。在这种情况下,您必须将属性jersey.config.server.disableMoxyJson设置为true
例如:

@ApplicationPath("/api")
public class MyApplication extends Application {
    @Override
    public Map<String, Object> getProperties() {
        Map<String, Object> props = new HashMap<>();
        props.put("jersey.config.server.disableMoxyJson", true);
        return props;
    }
}

另见:

同样的事情也发生在一个新泽西客户身上:

new ClientConfig()
        .register(MyGsonProvider.class)
        .property("jersey.config.client.disableMoxyJson", true);

Payara 5

Payara 5支持JSON Binding API,所以继续使用Gson没有意义。我建议迁移到JSON-B。

jc3wubiy

jc3wubiy4#

你应该解决仅仅在你的pom中添加这个依赖

<dependency>
    <groupId>org.zalando.phrs</groupId>
    <artifactId>jersey-media-json-gson</artifactId>
    <version>0.1</version>
</dependency>

在这里你可以找到repo的源代码:https://github.com/zalando/jersey-media-json-gson

fivyi3re

fivyi3re5#

一个永恒之后...
您可以使用真实的的依赖泽西岛媒体gson

<dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-gson</artifactId>
        <version>${jersey.version}</version>
</dependency>

要注册的类是:

JsonGsonFeature.class

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