标签：导致 col lse jar stringbu efault 方式 line ide
Feign声明式调用服务 feign.codec.DecodeException: Error while extracting response for type [class **] and...
日前在做项目时候遇到feign调用出现返回乱码，导致程序出错事件。原因是因为cloud的依赖版本过低，feign不支持 gzip 解码。在不升级jar的情况下，增加了一个过滤器。
代码如下：
public class FeignResponseDecoder implements Decoder {
private final Decoder delegate;
public FeignResponseDecoder(Decoder delegate) {
Objects.requireNonNull(delegate, "Decoder must not be null. ");
this.delegate = delegate;
}
@Override
public Object decode(Response response, Type type) throws IOException {
Collection<String> values = response.headers().get(HttpEncoding.CONTENT_ENCODING_HEADER);
if (Objects.nonNull(values) && !values.isEmpty() && values.contains(HttpEncoding.GZIP_ENCODING)) {
byte[] compressed = Util.toByteArray(response.body().asInputStream());
if ((compressed == null) || (compressed.length == 0)) {
return delegate.decode(response, type);
}
//decompression part
//after decompress we are delegating the decompressed response to default
//decoder
if (isCompressed(compressed)) {
final StringBuilder output = new StringBuilder();
final GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed));
final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(gis, StandardCharsets.UTF_8));
String line;
while ((line = bufferedReader.readLine()) != null) {
output.append(line);
}
Response uncompressedResponse = response.toBuilder().body(output.toString().getBytes()).build();
return delegate.decode(uncompressedResponse, type);
} else {
return delegate.decode(response, type);
}
} else {
return delegate.decode(response, type);
}
}
private static boolean isCompressed(final byte[] compressed) {
return (compressed[0] == (byte) (GZIPInputStream.GZIP_MAGIC)) && (compressed[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8));
}
}
再把这个类，以bean的方式注入即可:
@Bean
public Decoder GZIPResponseDecoder(ObjectFactory<HttpMessageConverters> messageConverters) {
Decoder decoder = new FeignResponseDecoder(new SpringDecoder(messageConverters));
return decoder;
}
标签：导致 col lse jar stringbu efault 方式 line ide
原文地址：https://www.cnblogs.com/woshuaile/p/14754978.html
