在Spring MVC REST中返回文件

  • Z时代
  • 2024-01-10
  • 分类：问答

我有下面的REST服务代码，该代码返回一个文件，现在问题出在PostMan客户端的响应正文中，我得到了原始响应，该如何转换它以便将文件内容显示给客户端，目标是将文件返回给用户。文件名是“

File1.jpeg”

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;
}

回答：

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;
}

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