Rest 下载文件接口 httpclient调用方法

下载文件被调用接口：

@PostMapping("/download")
@Transactional
public ResponseEntity<byte[]> downloadFile(@Valid @RequestBody XXXVo vo) throws IOException {
 
if(null==vo){
return new ResponseEntity<byte[]>(HttpStatus.BAD_REQUEST);
}
String path = ResourceUtils.CLASSPATH_URL_PREFIX + "templates/";
String fileName = "temp.xls";
File file = ResourceUtils.getFile(path + fileName);
FileInputStream in = new FileInputStream(file);
HSSFWorkbook workbook = new HSSFWorkbook(in);
byte[] fileArray = null;
try {
fixedWorkbook(workbook, vo);
fileArray = readWorkbookStream(workbook);
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtil.close(workbook, in);
}

return new ResponseEntity<byte[]>(fileArray, HttpStatus.OK);
}

public static byte[] readWorkbookStream(HSSFWorkbook wb) throws IOException{
ByteArrayOutputStream out = new ByteArrayOutputStream();
wb.write(out);
close(wb, out);
return out.toByteArray();
}

 下载文件调用方法：

 
@SuppressWarnings("unchecked")
public Map<String, Object> downloadFile(Map<String, Object> params,HttpServletRequest request,HttpServletResponse response) throws ParseException, UnsupportedEncodingException {

String url=“http://127.0.0.1:9080/download”;
byte[] buffer = new byte[1024];
int len = -1;
CloseableHttpClient httpClient = HttpClients.createDefault();
String jsonMap = comnSvc.mapToString(paramMap);
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("Content-type","application/json; charset=utf-8");
httpPost.setHeader("Accept", "application/json");
httpPost.setEntity(new StringEntity(jsonMap,"UTF-8"));
try (CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
InputStream input = httpResponse.getEntity().getContent();
OutputStream output = response.getOutputStream();) {

String tt= System.currentTimeMillis()+ ".xls";
String header = "attachment;filename="+ tt;
response.setHeader("Content-disposition", header);
response.setContentType("application/vnd.ms-excel;charset=UTF-8");//xls 文件；xml 为"text/xml; charset=UTF-8" 

while((len=input.read(buffer))!=-1){
output.write(buffer, 0, len);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

转载请注明地址：https://www.cnblogs.com/zhima/p/9890312.html