Post Java and other files with File parameters for file upload request, the client is usually the page, implemented in front-end web pages upload files is not difficult to write a form, add enctype = "multipart / form-data", in writing received on it, not that hard. If you want java.net.HttpURLConnection, java background to achieve file upload, really engage in a little head, ideas and specific steps to achieve the request is to simulate the page, the page format issued as follows: ----------- ------------------ 7da2e536604c8 Content-Disposition: form-data; name = "luid" 123 ----------------- ------------ 7da2e536604c8 Content-Disposition: form-data; name = "file1"; filename = "D: \ haha.txt" Content-Type: text / plain haha hahaha ---- ------------------------- 7da2e536604c8 Content-Disposition: form-data; name = "file"; filename = "D: \ huhu.png" Content-Type: application / octet-stream here is a picture of binary data ----------------------------- 7da2e536604c8-
demo code only two parameters, a File, a String ---------------- Disclaimer: This article is the original article CSDN bloggers "jianbin.huang", and follow CC 4.0 by- sa copyright agreement, reproduced, please attach the original source link and this statement. Original link: https: //blog.csdn.net/qq_17782389/article/details/91519554
public static void sendPostWithFile(String filePath) { DataOutputStream out = null; final String newLine = "\r\n"; final String prefix = "--"; try { URL url = new URL("https://ws-di1.sit.cmrh.com/aiisp/v1/mixedInvoiceFileOCR"); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); String BOUNDARY = "-------7da2e536604c8"; conn.setRequestMethod("POST"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("Charsert", "UTF-8"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); out = new DataOutputStream(conn.getOutputStream()); File (filePath);new new File File =add parameters File// the StringBuilder SB1= new StringBuilder(); sb1.append(prefix); sb1.append(BOUNDARY); sb1.append(newLine); sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine); sb1.append("Content-Type:application/octet-stream"); sb1.append(newLine); sb1.append(newLine); out.write(sb1.toString().getBytes()); DataInputStream in = new DataInputStream(new FileInputStream(file)); byte[] bufferOut = new byte[1024]; int bytes = 0; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } out.write(newLine.getBytes()); in.close(); // 添加参数sysName StringBuilder sb = new StringBuilder(); sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=\"sysName\""); sb.append(newLine); sb.append(newLine); sb.append("test"); out.write(sb.toString().getBytes()); // 添加参数returnImage StringBuilder sb2 = new StringBuilder(); sb2.append(newLine); sb2.append(prefix); sb2.append(BOUNDARY); sb2.append(newLine); sb2.append("Content-Disposition: form-data;name=\"returnImage\""); sb2.append(newLine); sb2.append(newLine); sb2.append("false"); out.write(sb2.toString().getBytes()); byte[] = End_data ( "\ R & lt \ N--" the BOUNDARY + + "- \ R & lt \ n-" ) .getBytes (); // write end identification out.write (end_data); out.flush (); OUT .close (); // define BufferedReader input stream in response to read the URL BufferedReader Reader = new new BufferedReader ( new new the InputStreamReader (conn.getInputStream ())); String Line = null ; the while ((Line = reader.readLine ()) ! = null ) { System.out.println (Line); } } the catch(Exception E) { System.out.println ( "POST request transmission abnormality!" + E); e.printStackTrace (); } } --------
/** * post请求 不带file * 参数使用 * JSONObject jp = new JSONObject(); * String param = jp.toJSONString() */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); // URL realUrl = new URL("https://testzoms.txffp.com/pcs/app/common/checkInvoice"); URLConnection conn = realUrl.openConnection(); conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); out = new PrintWriter(conn.getOutputStream()); out.print(param); out.flush(); define BufferedReader input stream to read the URL of the response// = in new new the BufferedReader ( new new the InputStreamReader (conn.getInputStream ())); String Line; the while (! (= in.readLine Line ()) = null ) { Result + = Line; // System.out.println (Result) ; } } the catch (exception E) { System.out.println ( "! sending a POST abnormal" + E); e.printStackTrace (); } // use the finally block to close the output stream, the input stream finally { the try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException e) { e.printStackTrace(); } } return result; }
/** * post请求 带file,map是其余参数 */ public static JSONObject sendPostWithFile(MultipartFile file, HashMap<String, Object> map) { DataOutputStream out = null; DataInputStream in = null; final String newLine = "\r\n"; final String prefix = "--"; JSONObject json = null; PropUtils propUtils = new PropUtils("cfg.properties"); try { String fileOCRUrl = propUtils.getProp("fileOCRUrl"); URL url = new URL(fileOCRUrl); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); String BOUNDARY = "-------KingKe0520a"; conn.setRequestMethod("POST"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); conn.setUseCaches(false); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("Charsert", "UTF-8"); conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY); out = new DataOutputStream(conn.getOutputStream()); // 添加参数file // File file = new File(filePath); StringBuilder sb1 = new StringBuilder(); sb1.append(prefix); sb1.append(BOUNDARY); sb1.append(newLine); sb1.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"" + newLine); sb1.append("Content-Type:application/octet-stream"); sb1.append(newLine); sb1.append(newLine); out.write(sb1.toString().getBytes()); // in = new DataInputStream(new FileInputStream(file)); in = new DataInputStream(file.getInputStream()); byte[] bufferOut = new byte[1024]; int bytes = 0; while ((bytes = in.read(bufferOut)) != -1) { out.write(bufferOut, 0, bytes); } out.write(newLine.getBytes()); StringBuilder sb = new StringBuilder(); int k = 1; for (String key : map.keySet()) { if (k != 1) { sb.append(newLine); } sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=" + key + ""); sb.append(newLine); sb.append(newLine); sb.append(map.get(key)); out.write(sb.toString().getBytes()); sb.delete(0, sb.length()); k++; } // 添加参数sysName /*StringBuilder sb = new StringBuilder(); sb.append(prefix); sb.append(BOUNDARY); sb.append(newLine); sb.append("Content-Disposition: form-data;name=\"sysName\""); sb.append(newLine); sb.append(newLine); sb.append("test"); out.write(sb.toString().getBytes());*/ // 添加参数returnImage /*StringBuilder sb2 = new StringBuilder(); sb2.append(newLine); sb2.append(prefix); sb2.append(BOUNDARY); sb2.append(newLine); sb2.append("Content-Disposition: form-data;name=\"returnImage\""); sb2.append(newLine); sb2.append(newLine); sb2.append("false"); out.write(sb2.toString().getBytes());*/ byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes(); out.write(end_data); out.flush(); new new BufferedReader Reader =define BufferedReader input stream to retrieve the response of the URL// BufferedReader(new InputStreamReader(conn.getInputStream())); String line = null; StringBuffer resultStr = new StringBuffer(); while ((line = reader.readLine()) != null) { resultStr.append(line); } json = (JSONObject)JSONObject.parse(resultStr.toString()); } catch (Exception e) { System.out.println("发送POST请求出现异常！" + e); e.printStackTrace(); } finally { try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException e) { e.printStackTrace(); } } return json; }
/ ** * profile generic class * Usage: instantiated directly call getprop () * new new PropUtils (filePath) incoming file paths, resources following partial path * @author Jianbin * / public class PropUtils { Private the Properties Properties; public PropUtils (String propertisFile) { the InputStream in = null ; the try { Properties = new new the Properties (); in = PropUtils. class .getResourceAsStream ( "/" + propertisFile); Properties.load (in); } the catch (IOException e) { e.printStackTrace(); } } public String getProp(String key){ return properties.getProperty(key); } /*public static void main(String[] args) { PropUtils propUtils = new PropUtils("cfg.properties"); String str = propUtils.getProp("jobStatus.3"); System.out.println(str); }*/ }