Java 使用jackson时registerModule代码应位于何处

这是我的测试代码

DynaBean bean1 = new LazyDynaBean();
bean1.set("p1", 1);
bean1.set("p2", 2);
ObjectMapper mapper = new ObjectMapper();
try {
    LOGGER.error(mapper.writeValueAsString(bean1));
} catch (JsonProcessingException ex) {
    LOGGER.catching(ex);
}
SimpleModule simpleModule = new SimpleModule("SimpleModule", new Version(1, 0, 0, null, "com.bolan", "oa"));
simpleModule.addSerializer(DynaBean.class, new DynaBeanSerializer());
mapper.registerModule(simpleModule);

DynaBean bean2 = new LazyDynaBean();
bean2.set("p1", 1);
bean2.set("p2", 2);
try {
    LOGGER.error(mapper.writeValueAsString(bean2));
} catch (JsonProcessingException ex) {
    LOGGER.catching(ex);
}

这是DynaBeanSerializer的来源：

public class DynaBeanSerializer extends JsonSerializer<DynaBean> {

    private final static Logger LOGGER = LogManager.getLogger(DynaBeanSerializer.class);

    @Override
    public void serialize(DynaBean value, JsonGenerator gen, SerializerProvider serializers) throws IOException, JsonProcessingException {
        LOGGER.info("serializing the byna bean!");
        gen.writeStartObject();
        DynaProperty[] dynaProperties = value.getDynaClass().getDynaProperties();
        for (DynaProperty dynaProperty : dynaProperties) {
            try {
                gen.writeObjectField(dynaProperty.getName(), PropertyUtils.getProperty(value, dynaProperty.getName()));
            } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException ex) {
                LOGGER.error(ex);
            }
        }
        gen.writeEndObject();
    }

    @Override
    public Class<DynaBean> handledType() {
        LOGGER.info("get JsonSerializer type!");
        return DynaBean.class;
    }

}

然而，我希望输出如下：

10:21:03.933 [JavaFX Application Thread] ERROR com.bolan.test.javafx.test.FXMLController - {"p1":1,"p2":2}

此外，如果我按照以下方式编辑测试代码：

DynaBean bean1 = new LazyDynaBean();
bean1.set("p1", 1);
bean1.set("p2", 2);
ObjectMapper mapper = new ObjectMapper();
SimpleModule simpleModule = new SimpleModule("SimpleModule", new Version(1, 0, 0, null, "com.bolan", "oa"));
simpleModule.addSerializer(DynaBean.class, new DynaBeanSerializer());
mapper.registerModule(simpleModule);

DynaBean bean2 = new LazyDynaBean();
bean2.set("p1", 1);
bean2.set("p2", 2);
try {
    LOGGER.error(mapper.writeValueAsString(bean2));
} catch (JsonProcessingException ex) {
    LOGGER.catching(ex);
}

---

输出结果是我希望~这非常奇怪。

在第一次使用

ObjectMapper

之前，必须注册所有要使用的模块。使用后的注册可能有效，也可能无效；但是，由于序列化程序和反序列化程序的缓存，为已经序列化/反序列化的类型添加自定义（反）序列化程序将不会产生效果。

这是我的resteasy代码，用于将objectmapper演示到框架：

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

    private final static Logger LOGGER = LogManager.getLogger(CustomJsonProvider.class);
    private final ObjectMapper mapper;

    public CustomJsonProvider() {
        LOGGER.info("Register provider CustomJsonProvider for resteasy");
        this.mapper = new CustomObjectMapper();
    }

    @Override
    public ObjectMapper getContext(Class<?> type) {
        LOGGER.info("Get provider CustomJsonProvider for resteasy");
        return mapper;
    }

}

问题中给出了DynaBeanSerializer的源代码

这是我的web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <display-name>Restful Test</display-name>
    <context-param>
        <param-name>resteasy.jndi.resources</param-name>
        <param-value>java:app/service/LocatingResourceBean,java:app/service/SimpleResourceBean</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.providers</param-name>
        <param-value>com.bolan.rest.provider.CustomJsonProvider,com.bolan.rest.provider.CustomJsonBodyWriter</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.providers</param-name>
        <param-value>true</param-value>
    </context-param>
<!--    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>-->
    <servlet>
        <servlet-name>oa</servlet-name>
        <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>oa</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>

静息试验
resteasy.jndi.resources
java:app/service/LocatingResourceBean，java:app/service/SimpleResourceBean
resteasy.providers
com.bolan.rest.provider.CustomJsonProvider，com.bolan.rest.provider.CustomJsonBodyWriter
resteasy.scan.providers
符合事实的
骨性关节炎
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
骨性关节炎
/*
30

事实上，我正在使用resteasy。我想自定义某个类的序列化程序。但它不起作用。调试时，我发现自定义objectmapper是由reateasy创建的，但自定义序列化程序无法工作。我将在下面的回复中显示我的代码。我想知道RestEasy是否有任何代理类创建。你的代码在我看来是正确的，没有问题。

public class CustomObjectMapper extends ObjectMapper {

    private static final Logger LOGGER = LogManager.getLogger(CustomObjectMapper.class);

    public CustomObjectMapper() {
        SimpleModule simpleModule = new SimpleModule("SimpleModule", new Version(1, 0, 0, null, "com.bolan", "oa"));
        simpleModule.addSerializer(DynaBean.class, new DynaBeanSerializer());
        registerModule(simpleModule);
    }

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <display-name>Restful Test</display-name>
    <context-param>
        <param-name>resteasy.jndi.resources</param-name>
        <param-value>java:app/service/LocatingResourceBean,java:app/service/SimpleResourceBean</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.providers</param-name>
        <param-value>com.bolan.rest.provider.CustomJsonProvider,com.bolan.rest.provider.CustomJsonBodyWriter</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.scan.providers</param-name>
        <param-value>true</param-value>
    </context-param>
<!--    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>-->
    <servlet>
        <servlet-name>oa</servlet-name>
        <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>oa</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
</web-app>