feign.codec

Interface Encoder

All Known Implementing Classes:

Encoder.Default

public interface Encoder

Encodes an object into an HTTP request body. Like javax.websocket.Encoder. Encoder is used when a method parameter has no @Param annotation. For example:

 @POST
 @Path("/")
 void create(User user);
 

Example implementation:

 public class GsonEncoder implements Encoder {
   private final Gson gson;

   public GsonEncoder(Gson gson) {
     this.gson = gson;
   }

   @Override
   public void encode(Object object, Type bodyType, RequestTemplate template) {
     template.body(gson.toJson(object, bodyType));
   }
 }
 

Form encoding

If any parameters are found in MethodMetadata.formParams(), they will be collected and passed to the Encoder as a map.

Ex. The following is a form. Notice the parameters aren't consumed in the request line. A map including "username" and "password" keys will passed to the encoder, and the body type will be MAP_STRING_WILDCARD.

 @RequestLine("POST /")
 Session login(@Param("username") String username, @Param("password") String
 password);
 

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	Encoder.Default Default implementation of Encoder.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.reflect.Type	MAP_STRING_WILDCARD Type literal for Map<String, ?>, indicating the object to encode is a form.

Method Summary

Modifier and Type	Method and Description
void	encode(java.lang.Object object, java.lang.reflect.Type bodyType, RequestTemplate template) Converts objects to an appropriate representation in the template.

Field Detail

MAP_STRING_WILDCARD

static final java.lang.reflect.Type MAP_STRING_WILDCARD

Type literal for Map<String, ?>, indicating the object to encode is a form.

Method Detail

encode

void encode(java.lang.Object object,
            java.lang.reflect.Type bodyType,
            RequestTemplate template)
     throws EncodeException

Converts objects to an appropriate representation in the template.

Parameters:

object - what to encode as the request body.

bodyType - the type the object should be encoded as. MAP_STRING_WILDCARD indicates form encoding.

template - the request template to populate.

Throws:

EncodeException - when encoding failed due to a checked exception.