java如何在Google Guice中使用Jersey ExceptionMapper？

Question

我正在使用Jersey Guice，需要配置一个自定义ExceptionMapper

我的模块如下所示：

public final class MyJerseyModule extends JerseyServletModule
{
   @Override
   protected void configureServlets()
   {
      ...
      filter("/*").through(GuiceContainer.class);
      ...
   }
}

这是我的ExceptionMapper：

import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;

public class MyExceptionMapper implements ExceptionMapper<MyException>
{
   @Override
   public Response toResponse(final MyException exception)
   {
      return Response.status(Status.NOT_FOUND).entity(exception.getMessage()).build();
   }
}

Answer 1

您的ExceptionMapper必须用@Provider注释，并且是单例

import com.google.inject.Singleton;

import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

@Provider
@Singleton
public class MyExceptionMapper implements ExceptionMapper<MyException>
{
   @Override
   public Response toResponse(final MyException exception)
   {
      return Response.status(Status.NOT_FOUND).entity(exception.getMessage()).build();
   }
}

然后只需将ExceptionMapper绑定到与JerseyServletModule相同的Injector中的一个Guice模块中，Jersey Guice就会自动找到它

import com.google.inject.AbstractModule;

public class MyModule extends AbstractModule
{
   @Override
   protected void configure()
   {
      ...
      bind(MyExceptionMapper.class);
      ...
   }
}

如果您想：

public final class MyJerseyModule extends JerseyServletModule
{
   @Override
   protected void configureServlets()
   {
      ...
      filter("/*").through(GuiceContainer.class);
      bind(MyExceptionMapper.class);
      ...
   }
}