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feign响应Image流对象

feign面向方法签名的http调用,越来越受欢迎,类型于rpc的thrift,只需要关注方法签名和返回值即可,当然feign响应流对象时,需要我们做一下特殊处理,否则会出现异常。也有一些文章通过重写HttpMessageConvert来实现,但我测试后发现还是失败的。

> Accept: image/*会返回406 Not Acceptable

### 解决方法

feign代码,注意返回值必须是`feign.Response`

```

@PostMapping(value = "/wxa/getwxacodeunlimit")

feign.Response getQrImagePath(@RequestParam("access_token") String accessToken,@RequestBody Map<String, Object> body);

class WeixinClientFallback implements WeixinClient {

```

restcontroller代码,需要显示声明`produces`类型,这里因为是图片,所以声明为`MediaType.IMAGE_JPEG_VALUE`

```

@GetMapping(value = "/v1/api/sales/qrcode", produces = MediaType.IMAGE_JPEG_VALUE)

public void qrcode(HttpServletResponse response) {

//获取token

Map<String, Object> tokenMap = weixinClient.getToken("client_credential", wxAppId, wxAppSecret);

if (tokenMap == null) {

throw Exceptions.paramError("获取token失败");

}

if (tokenMap.containsKey("errcode")) {

throw Exceptions.paramError(MapUtils.getString(tokenMap, "errmsg"));

}

String scene = String.format("salesPersonId=%s&agencyId=%s",

TokenContext.getToken().getUserId(),

TokenContext.getToken().getCompanyId());

String token = MapUtils.getString(tokenMap, "access_token");

Map<String, Object> requestParams = new HashMap<>();

requestParams.put("scene", scene);

requestParams.put("page", weixinPage);

feign.Response imgReponse = weixinClient.getQrImagePath(token, requestParams);

if (imgReponse == null) {

throw Exceptions.paramError("获取二维码失败");

}

try (InputStream inputStream = imgReponse.body().asInputStream();

ServletOutputStream outputStream = response.getOutputStream()) {

response.setContentType("image/png");

outputStream.write(IOUtils.toByteArray(inputStream));

} catch (RuntimeException e) {

throw Exceptions.paramError("获取二维码失败");

} catch (Exception ex) {

throw Exceptions.paramError("获取二维码失败");

}

}

```

原文  http://www.cnblogs.com/lori/p/11305032.html
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