Spring Cloud OpenFeign 自定义 ErrorDecoder

示例代码

配置类

形参中注入Decoder（默认启动时就会注入Decoder，参见默认配置FeignClientsConfiguration），解析response。

使用jackson的JsonNode接收，由框架自己识别类型，不用判断数组或对象。

import com.fasterxml.jackson.databind.JsonNode;
import feign.codec.Decoder;
import feign.codec.ErrorDecoder;
import java.io.IOException;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.ResponseEntity;
import org.springframework.http.ResponseEntity.BodyBuilder;

@Configuration
public class FeignSpecificDecoderConfig {

    private final ObjectFactory<HttpMessageConverters> messageConverters;

    public FeignSpecificDecoderConfig(ObjectFactory<HttpMessageConverters> objectFactory) {
        this.messageConverters = objectFactory;
    }

    @Bean
    public ErrorDecoder specificErrorDecoder(Decoder decoder) {
        return (methodKey, response) -> {
            TestException testException = new TestException();
            BodyBuilder builder = ResponseEntity.status(response.status());
            try {
                Object decode = decoder.decode(response, JsonNode.class);

                ResponseEntity<Object> body = builder
                    .body(decode);

                testException.setResponse(body);
            } catch (Exception e) {
                testException.setResponse(builder.build());
            }
            return testException;
        };
    }

}

异常包装类

public class TestException extends RuntimeException {

    private Object response;

    public Object getResponse() {
        return response;
    }

    public void setResponse(Object response) {
        this.response = response;
    }
}