Java以post请求发送文件或json数据

分别给出了post发送文件和json数据的函数，其中使用到了Jackson库来转化Json数据，使用log4j2来打印日记，可自行剔除。

public class HttpUtils {static private ObjectMapper objectMapper=new ObjectMapper();static private Logger logger= LogManager.getLogger();/*** 以post请求方式发送文件* @param url * @param name 文件的请求参数名* @param fileName 文件名* @param fileInput 文件的输入流* @return 默认返回参数为Json格式的数据* @throws IOException* @throws InterruptedException*/static public Map<String,Object> postFile2(String url,String name,String fileName,InputStream fileInput) throws IOException, InterruptedException {String charset = "UTF-8";String boundary = Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.String CRLF = "\r\n"; // Line separator required by multipart/form-data.URLConnection connection = new URL(url).openConnection();connection.setDoOutput(true);connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);try (OutputStream output = connection.getOutputStream();PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);) {// Send binary file.writer.append("--" + boundary).append(CRLF);writer.append("Content-Disposition: form-data; name=\""+URLEncoder.encode(name,"UTF-8")+"\"; filename=\"" + URLEncoder.encode(fileName,"UTF-8") + "\"").append(CRLF);writer.append("Content-Type: " + URLConnection.guessContentTypeFromName(fileName)).append(CRLF);writer.append("Content-Transfer-Encoding: binary").append(CRLF);writer.append(CRLF).flush();fileInput.transferTo(output);output.flush(); // Important before continuing with writer!writer.append(CRLF).flush(); // CRLF is important! It indicates end of boundary.// End of multipart/form-data.writer.append("--" + boundary + "--").append(CRLF).flush();}// Request is lazily fired whenever you need to obtain information about response.int responseCode = ((HttpURLConnection) connection).getResponseCode();System.out.println(responseCode); // Should be 200//读取响应消息BufferedReader reader=new BufferedReader(new InputStreamReader(connection.getInputStream()));StringBuilder stringBuilder=new StringBuilder();String tempStr=null;while((tempStr=reader.readLine())!=null){stringBuilder.append(tempStr);}//转化为JSONMap<String,Object> response= objectMapper.readValue(stringBuilder.toString(),Map.class);return response;}/*** 以post请求发送Json文件*/public static Map<String,Object> sendJsonPost(String url,String jsonStr) throws IOException, Utils.ReceiveBadCodeException {HttpURLConnection httpURLConnection= (HttpURLConnection) new URL(url).openConnection();//配置连接httpURLConnection.setDoOutput(true);httpURLConnection.setRequestMethod("POST");httpURLConnection.setRequestProperty("Content-Type","application/json;charset=UTF-8");OutputStream out=httpURLConnection.getOutputStream();//发送out.write(jsonStr.getBytes("UTF-8"));//检查响应InputStream in=httpURLConnection.getInputStream();StringBuilder stringBuilder=new StringBuilder();byte[] bytes=new byte[1024];int num;while((num=in.read(bytes))!=-1){stringBuilder.append(new String(bytes,"utf-8"));}Map<String,Object> response=objectMapper.readValue(stringBuilder.toString(),Map.class);return response;}}

参考：

Upload files from Java client to a HTTP server
Sending HTTP POST Request In Java

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