Sayaka617 opened a new issue #2449:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2449
参考文件上传下载开发的文件下载接口，调用时报错“ File input parameter of null could be
javax.servlet.http.Part / java.io.InputStream /
org.springframework.core.io.Resource / byte[] or java.io.File, but got
org.springframework.http.ResponseEntity.”(PartUtils.java)
接口定义
```java
@ApiResponses({
@ApiResponse(code = 200, response = File.class, message = "success")
})
@PostMapping(value = "/export", produces =
"application/json;charset=utf-8")
public ResponseEntity<FileResource> export() {
// doSomething
return ResponseEntity.ok()
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment;
filename=" + fileName)
.header(HttpHeaders.CONTENT_TYPE, getContentType(fileType))
.header(HttpHeaders.CONTENT_LENGTH,
String.valueOf(content.length))
.body(new FileResource(content, fileName));
}
```
body体对象:
```java
public class FileResource extends ByteArrayResource {
private String downloadFileName;
public FileResource(byte[] byteArray, String downloadFileName) {
super(byteArray);
this.downloadFileName= downloadFileName;
}
@Override
public String getFilename() {
return downloadFileName;
}
}
```
debug查看org.apache.servicecomb.common.rest.filter.inner.ServerRestArgsFilter
```java
Response response = (Response)
responseEx.getAttribute(RestConst.INVOCATION_HANDLER_RESPONSE);
ProduceProcessor produceProcessor =
(ProduceProcessor)
responseEx.getAttribute(RestConst.INVOCATION_HANDLER_PROCESSOR);
Object body = response.getResult();
if (response.isFailed()) {
body = ((InvocationException) body).getErrorData();
}
if (null != invocation && isDownloadFileResponseType(invocation,
response)) {
return responseEx.sendPart(PartUtils.getSinglePart(null, body));
}
```
对比正常的文件下载接口，`Object
body`应该是responseEntity.getBody()的内容，实际是整个responseEntity，麻烦帮忙分析一下问题。
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