无法在JERSEY RS中的ParamConverter中运行自定义java类型

Question

  <dependencies>
  <dependency>
   <groupId>org.glassfish.jersey.bundles</groupId>
    <artifactId>jaxrs-ri</artifactId>
    <version>2.0</version>
    <!--   <scope>provided</scope> -->
</dependency>

  <dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-moxy</artifactId>
    <version>2.16</version>
    <scope>provided</scope>
</dependency>

<dependency>
   <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet</artifactId>
    <version>2.16</version>
</dependency>

   </dependencies>

@Provider
public class MyParamConverterProvider implements ParamConverterProvider{
    @Override
    public <T> ParamConverter<T> getConverter(Class<T> rawType, Type genericType, Annotation[] annotations) {
        if(rawType.equals(DateResource.class)){
           // return (ParamConverter<T>) new MyDate();
            return (ParamConverter<T>) new DateResource();
            //return (ParamConverter<T>) new ParamConverter<DateResource>();
        }
        return null;
    }

    }

public class DateResource implements ParamConverter<MyDate> {
@Override
    public MyDate fromString(String value) {
        // TODO Auto-generated method stub
         if (value == null || value.trim().isEmpty()) {
                return null;
            }

         MyDate dateParamModel = new MyDate();
        dateParamModel.setDateAsString(value);
        return  dateParamModel;

    }

    @Override
    public String toString(MyDate mo) {


            return ((MyDate) mo).getDateAsString();
    }

}

public class MyDate {


    private String dateAsString;

    public String getDateAsString() {
        return dateAsString;
    }

    public void setDateAsString(String dateAsString) {
        this.dateAsString = dateAsString;
    }

    public LocalDateTime getDate() {
        LocalDateTime dateTime = null;
        try {
            dateTime = LocalDateTime.parse(dateAsString, DateTimeFormatter.ISO_DATE_TIME);
        } catch (DateTimeParseException ex) {
            System.err.println("Conversion of dateAsString: " + dateAsString + " using ISO date time failed.");
        }
        try {
            dateTime = LocalDateTime.parse(dateAsString, DateTimeFormatter.ISO_DATE);
        } catch (DateTimeParseException ex) {
            System.err.println("Conversion of dateAsString: " + dateAsString + " using ISO date failed.");
        }

        return dateTime;
    }
}

@Path("date/{dateString}")
public class MyCustomdate {

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    //public String getRequestedDate(@PathParam("dateString") String dateString)
    public String getRequestedDate(@PathParam("dateString") MyDate myDate)
    {
        return "Got"+ myDate.getDate() ;
    }

}

我的主要班级

@ApplicationPath("webapi")
public class MyRestApiApp extends Application {

}

请就这个问题进行指导。

Answer 1

if(rawType.equals(DateResource.class)){

这是不对的。您需要检查参数类型。在验证资源参数时，Jersey要做的是检查所有paramconverterprovider，看看它们是否都返回该参数类型的null以外的其他内容。由于您检查的是转换器类型而不是参数类型，因此在检查mydate参数期间，它返回null。这时就会发生ModelValidationExeption。

只需更改它以检查要转换的参数类型。

if(rawType.equals(MyDate.class)){

还要从依赖项中删除jaxrs-ri。你不需要它。