一、需求：
前端multipartfile 上传文件，后端接收后构造post请求，调用外部接口，传送文件流及其他参数
二、内容包括：
1.前端postman调用上传接口
2.后端接收multipartfile文件
3.后端用httpclient构造post请求
三、代码
@PostMapping(value ="uploadImage")
public void uploadImage(Model model, @RequestParam(value ="image") MultipartFile image, String label) {
log.info("=============uploadImage start=================");
log.info("图像处理的标签"+label);
Map data =new HashMap();
log.info("开始post请求构造======");
String url ="http://ip:port/mytest/fileup";//服务端要调用的外部接口
Map resultMap =new HashMap();
//httpclients构造post请求
CloseableHttpClient httpClient = HttpClients.createDefault();
try {
log.info("post请求的url"+url);
HttpPost httpPost =new HttpPost(url);
//HttpMultipartMode.RFC6532参数的设定是为避免文件名为中文时乱码
MultipartEntityBuilder builder = MultipartEntityBuilder.create().setMode(HttpMultipartMode.RFC6532);
String originFileName =null;
originFileName = image.getOriginalFilename();
// File file1 = new File("/home/temp/下载/1200-560.jpg"); //测试外部接口直接上传本地图片
//builder.addBinaryBody("image", image.getInputStream(), ContentType.MULTIPART_FORM_DATA, originFileName);// 设置上传文件流(需要是输出流)，设置contentType的类型
//重中之重！！！！contentType的类型的设置 如果你只传一个文件可以设置成ContentType.MULTIPART_FORM_DATA 如果你传多个文件必须设置如下格式图片类型---》image/jpeg pdf类型---》application/pdf 其他类型可百度 重点是不能笼统的设置成MULTIPART_FORM_DATA
builder.addBinaryBody("image", image.getInputStream(), "image/jpeg", originFileName);
builder.addBinaryBody("pdf", image.getInputStream(), "application/pdf", originFileName);
builder.addTextBody("label",label);//post请求中的其他参数
// log.info("上传图的标签label"+label);
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
HttpResponse response = httpClient.execute(httpPost);// 执行提交
HttpEntity responseEntity = response.getEntity();//接收调用外部接口返回的内容
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){// String imageUrl = stringStringMap.get("data"); // data.put("path",imageUrl);
result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));
}
logger.info("http请求结果是："+result);
}catch (Exception e) {
model.addAttribute("code", "错误码");
model.addAttribute("message","错误的提示信息");
}finally {//处理结束后关闭httpclient的链接
try {
httpClient.close();
}catch (IOException e) {
e.printStackTrace();
}
}
}
四、总结
无论你使用HttpPost还是PostMethod，只要上传多个文件ContentType的类型必须分开设置不能笼统的设置成MULTIPART_FORM_DATA