MultipartyFile类型也能发送，我这里是发送的File类型的
public static String postFile(String url,String file,FileBody fileBody,Map<String,String> headers,Map<String,String> param) throws Exception {
CloseableHttpClient httpClient = getHttpClient();
HttpPost post = new HttpPost(url);
//设置请求头
for (String key : headers.keySet()) {
post.setHeader(key, headers.get(key));
}
//设置参数
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
for(Map.Entry<String, String> key : param.entrySet()){
builder.addTextBody(key.getKey(),key.getValue());
}
//添加文件
builder.addPart(file,fileBody);
HttpEntity reqEntity = builder.build();
post.setEntity(reqEntity);
//发送请求
CloseableHttpResponse response = httpClient.execute(post);
//获取响应
String respStr = null;
HttpEntity responseEntity = response.getEntity();
if (responseEntity != null) {
respStr = EntityUtils.toString(responseEntity, "UTF-8");
}
//释放连接
EntityUtils.consume(response.getEntity());
response.close();
return respStr;
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