Java 在 Spring MVC REST 中返回文件
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Return file in Spring MVC REST
提问by arpit joshi
I have the REST Service Code Below code which returns a File ,now the problem is in the response body on the PostMan Client I get a raw response ,how can I can convert it so that it displays the contents of the file to the client ,Goal is to return a file to the user .File Name is "File1.jpeg"
我有 REST 服务代码下面的代码返回一个文件，现在问题出在 PostMan 客户端上的响应正文中我得到一个原始响应，我该如何转换它以便它向客户端显示文件的内容，目标是向用户返回一个文件。文件名是“File1.jpeg”
Code:
代码：
@RequestMapping(value = URIConstansts.GET_FILE, produces = { "application/json" }, method = RequestMethod.GET)
public @ResponseBody ResponseEntity getFile(@RequestParam(value="fileName", required=false) String fileName,HttpServletRequest request) throws IOException{
ResponseEntity respEntity = null;
byte[] reportBytes = null;
File result=new File("/home/arpit/Documents/PCAP/dummyPath/"+fileName);
if(result.exists()){
InputStream inputStream = new FileInputStream("/home/arpit/Documents/PCAP/dummyPath/"+fileName);
byte[]out=org.apache.commons.io.IOUtils.toByteArray(inputStream);
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.add("content-disposition", "attachment; filename=" + fileName);
respEntity = new ResponseEntity(out, responseHeaders,HttpStatus.OK);
}else{
respEntity = new ResponseEntity ("File Not Found", HttpStatus.OK);
}
return respEntity;
}
采纳答案by arpit joshi
The code below solved my problem:
下面的代码解决了我的问题：
@RequestMapping(value = URIConstansts.GET_FILE, produces = { "application/json" }, method = RequestMethod.GET)
public @ResponseBody ResponseEntity getFile(@RequestParam(value="fileName", required=false) String fileName,HttpServletRequest request) throws IOException{
ResponseEntity respEntity = null;
byte[] reportBytes = null;
File result=new File("/home/arpit/Documents/PCAP/dummyPath/"+fileName);
if(result.exists()){
InputStream inputStream = new FileInputStream("/home/arpit/Documents/PCAP/dummyPath/"+fileName);
String type=result.toURL().openConnection().guessContentTypeFromName(fileName);
byte[]out=org.apache.commons.io.IOUtils.toByteArray(inputStream);
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.add("content-disposition", "attachment; filename=" + fileName);
responseHeaders.add("Content-Type",type);
respEntity = new ResponseEntity(out, responseHeaders,HttpStatus.OK);
}else{
respEntity = new ResponseEntity ("File Not Found", HttpStatus.OK);
}
return respEntity;
}
回答by DhruvG
You need to use different content type instead of produces = { application/json" }
您需要使用不同的内容类型而不是产生 = { application/json" }
Content-types
内容类型
http://silk.nih.gov/public/[email protected]
http://silk.nih.gov/public/[email protected]
If it still dont work then try to get HttpServletResponse and write your file data to Stream with response.setContentType();
如果它仍然不起作用，那么尝试获取 HttpServletResponse 并使用 response.setContentType() 将您的文件数据写入 Stream ；
Note :: Recently I have use response.getOutputStream to write a Excel file. Due to some reasons setting produces wasnt working for me.
注意 :: 最近我用 response.getOutputStream 写了一个 Excel 文件。由于某些原因，设置产品对我不起作用。
Also you can use Firebug in firefox to see Response headers.
您也可以在 firefox 中使用 Firebug 来查看响应头。
