HttpURLConnection下载文件，byte数组POST multipart/form-data

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import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.Closeable; import java.io.DataOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; import java.util.HashMap; import java.util.Iterator; import java.util.Map; public class HttpDownload { * @param urlPath 下载路径 * @param downloadDir 下载存放目录 * @return 返回下载文件 public static byte [] downloadFile(String urlPath, String downloadDir, String fileName) { BufferedInputStream in = null ; OutputStream out = null ; HttpURLConnection connection = null ; try { URL url = new URL(urlPath); connection = (HttpURLConnection)url.openConnection(); connection.setRequestMethod( "GET" ); connection.setRequestProperty( "Content-Type", "application/octet-stream;charset=utf-8" ); connection.setRequestProperty( "Connection", "close" ); connection.setConnectTimeout( 5000 ); connection.setDoOutput( true ); connection.setDoInput( true ); connection.connect(); // 文件大小 int fileLength = connection.getContentLength(); System.out.println( "file length-------------" + fileLength + " (byte)" ); in = new BufferedInputStream(connection.getInputStream()); String path = downloadDir + File.separatorChar + fileName; // 下载文件到本地 File file = new File(path); if (! file.getParentFile().exists()) { file.getParentFile().mkdirs(); out = new FileOutputStream(file); int size = 0 ; int len = 0 ; byte [] buf = new byte [1024 * 1024 ]; byte [] data = new byte [fileLength]; int dataPos = 0 ; while ((size = in.read(buf)) != -1 ) { len += size; out.write(buf, 0 , size); for ( int i = 0; i < size; i++ ) { data[dataPos] = buf[i]; dataPos ++ ; System.out.println( "download finish--" + fileLength + "," + len + "," + dataPos + " (byte)" ); return data; } catch (Exception e) { e.printStackTrace(); } finally { close(in, out); closeConnection(connection); return new byte [0 ]; public static String uploadFile(String actionUrl, Map<String, String> textMap, String filekey, byte [] data, String fileName) { String end = "\r\n" ; String boundary = "----WebKitFormBoundaryLBFuobxXx0AmQVFR" ; DataOutputStream out = null ; BufferedReader reader = null ; HttpURLConnection connection = null ; try { URL url = new URL(actionUrl); connection = (HttpURLConnection)url.openConnection(); connection.setDoInput( true ); connection.setDoOutput( true ); connection.setUseCaches( false ); connection.setRequestMethod( "POST" ); connection.setRequestProperty( "Connection", "close" ); connection.setRequestProperty( "Charset", "utf-8" ); connection.setRequestProperty( "Content-Type", "multipart/form-data; boundary=" + boundary); out = new DataOutputStream(connection.getOutputStream()); // 处理文本============================== String strData = "" ; if (textMap != null ) { Iterator <Map.Entry<String, String>> iter = textMap.entrySet().iterator(); while (iter.hasNext()) { Map.Entry <String, String> entry = iter.next(); String name = (String)entry.getKey(); String value = (String)entry.getValue(); if (value == null ) { continue ; value = new String(value.getBytes("utf-8" )); strData = end + "--" + boundary + end; System.out.println(strData); out.writeBytes(strData); strData = "Content-Disposition: form-data; name=\"" + name + "\"" + end + end + value; System.out.println(strData); out.writeBytes(strData); // 处理文本结束============================== // 开始上传文件======================================== strData = end + "--" + boundary + end; System.out.println(strData); out.writeBytes(strData); strData = "Content-Disposition: form-data;" + " name=\"" + filekey + "\"; filename=\"" + fileName + "\"" + end; System.out.println(strData); out.writeBytes(strData); strData = "Content-Type:" + " text/plain" + end + end; System.out.println(strData); out.writeBytes(strData); System.out.println( "二进制..." ); out.write(data); System.out.println(end); out.writeBytes(end); strData = "--" + boundary + "--" + end; System.out.println(strData); // 开上传文件结束======================================== // 请求结束标志 out.writeBytes(strData); out.flush(); // 获取响应 if (connection.getResponseCode() >= 300 ) { throw new Exception("HTTP Request fail,response code " + connection.getResponseCode()); StringBuilder sb = new StringBuilder(); if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { reader = new BufferedReader( new InputStreamReader(connection.getInputStream())); String strLine = null ; while ((strLine = reader.readLine()) != null ) { sb.append(strLine); return sb.toString(); } catch (Exception e) { e.printStackTrace(); } finally { close(out, reader); closeConnection(connection); return "" ; public static void close(Closeable... args) { for (Closeable closeable : args) { if (closeable != null ) { try { closeable.close(); } catch (IOException e) { e.printStackTrace(); private static void closeConnection(HttpURLConnection connection) { if (connection != null ) { connection.disconnect(); public static void main(String[] args) { byte [] data = downloadFile( "https://4f7fce38e855e98a0d722672fc0a4ef4.dlied1.cdntips.net/dl.softmgr.qq.com/original/Picture/FocusOnIV64_1.23.exe?mkey=607322a66f1278d3&f=9870&cip=111.18.94.38&proto=https" , "C:\\Users\\admin\\Desktop", "FocusOnIV64_1.23.exe" ); Map <String, String> textMap = new HashMap<String, String> (); textMap.put( "id", "123" ); textMap.put( "name", "zinredible" ); String responseStr = uploadFile( "http://127.0.0.1/api/his/upload", textMap, "testFile", data, "FocusOnIV64_1.23.exe" ); System.out.println(responseStr);

// springboot接口
@PostMapping(value = "/api/his/upload", produces = "multipart/form-data;charset=UTF-8")
    @ApiImplicitParams({@ApiImplicitParam(name = "id", paramType = "form"),
        @ApiImplicitParam(name = "name", paramType = "form")})
    public String uploadFile(TestParam param, MultipartFile testFile,HttpServletRequest request) throws Exception