发送POST请求,包含文件MultipartFile参数,普通字符串参数,请求头参数
与别人对接时经常会遇到既发送文件参数又发送字符串参数的请求,此请求的核心是
文件参数的ContenType=multipart/form-data
字符串参数的ContenType=application/json
/** * 使用httpclint 发送文件,如果不传输文件,直接设置fileParams=null, * 如果不设置请求头参数,直接设置headerParams=null,就可以进行普通参数的POST请求了 * * @param url 请求路径 * @param fileParams 文件参数 * @param otherParams 其他字符串参数 * @param headerParams 请求头参数 * @return */ public static String uploadFile(String url, Map<String, MultipartFile> fileParams, Map<String, String> otherParams, Map<String, String> headerParams) { CloseableHttpClient httpClient = HttpClients.createDefault(); String result = ""; try { HttpPost httpPost = new HttpPost(url); //设置请求头 if (headerParams != null && headerParams.size() > 0) { for (Map.Entry<String, String> e : headerParams.entrySet()) { String value = e.getValue(); String key = e.getKey(); if (StringUtils.isNotBlank(value)) { httpPost.setHeader(key, value); } } } MultipartEntityBuilder builder = MultipartEntityBuilder.create(); builder.setCharset(Charset.forName("utf-8")); builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//加上此行代码解决返回中文乱码问题 // 文件传输http请求头(multipart/form-data) if (fileParams != null && fileParams.size() > 0) { for (Map.Entry<String, MultipartFile> e : fileParams.entrySet()) { String fileParamName = e.getKey(); MultipartFile file = e.getValue(); if (file != null) { String fileName = file.getOriginalFilename(); builder.addBinaryBody(fileParamName, file.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流 } } } // 字节传输http请求头(application/json) ContentType contentType = ContentType.create("application/json", Charset.forName("UTF-8")); if (otherParams != null && otherParams.size() > 0) { for (Map.Entry<String, String> e : otherParams.entrySet()) { String value = e.getValue(); if (StringUtils.isNotBlank(value)) { builder.addTextBody(e.getKey(), value, contentType);// 类似浏览器表单提交,对应input的name和value } } } HttpEntity entity = builder.build(); httpPost.setEntity(entity); HttpResponse response = httpClient.execute(httpPost);// 执行提交 HttpEntity responseEntity = response.getEntity(); if (responseEntity != null) { // 将响应内容转换为字符串 result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8")); } } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { try { httpClient.close(); } catch (IOException e) { e.printStackTrace(); } } return result; }
上面是发送请求的核心代码
下面是请求demo
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