在Spring MVC REST中返回文件

Question

我有REST服務代碼下面的代碼返回一個文件，現在問題是在PostMan客戶端的響應體中我得到一個原始響應，我怎么能轉換它以便它向客戶端顯示文件的內容，目標是將文件返回給用戶.File Name是“File1.jpeg”

碼：

@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;

}

Answer 1

下面的代碼解決了我的問題：

@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;
}

Answer 2

您需要使用不同的內容類型而不是produce = {application / json“}

內容類型

http://silk.nih.gov/public/zzyzzap.@www.silk.types.html

如果它仍然無法工作，那么嘗試獲取HttpServletResponse並使用response.setContentType（）將文件數據寫入Stream;

注意::最近我使用response.getOutputStream來編寫Excel文件。 由於某些原因，設置產品對我不起作用。

您還可以在firefox中使用Firebug來查看響應標頭。