在使用HttpURLConnection作为请求方式，有时候会有这样的需求。给一个接口上传文件，并且同时要提交其他的参数。但你可能会遇到这样的问题，就是无法同时上传文件的时候又提交其他类型的参数。怎么解决这个问题呢？
注释比较清晰，直接看代码吧：
private static HttpURLConnection uRLConnection; private static final String CHARSET = "UTF-8"; /** * 文件上传 * * @author：gj * @date: 2017/6/8 * @time: 11:25 * urlAddress 路径 * file 要上传的文件、 * fileKey 服务器端接收文件的字段 * param 需要同时提交的参数 * newFileName 给上传的文件重新命名，null则用文件原名 **/ public static String uploadFile(String urlAddress, File file, String fileKey, Map<String, String> param, String newFileName) { Log.i(TAG, "文件上传"); String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成 String PREFIX = "--", LINE_END = "\r\n"; String CONTENT_TYPE = "multipart/form-data"; // 内容类型 String response = "";//服务器端返回值 try { URL url = new URL(urlAddress); uRLConnection = (HttpURLConnection) url.openConnection();//打开连接 uRLConnection.setDoInput(true);//以后就可以使用conn.getOutputStream().read() uRLConnection.setDoOutput(true);//设置以后就可以使用conn.getOutputStream().write() uRLConnection.setRequestMethod("POST");//使用post提交 uRLConnection.setUseCaches(false);//不使用缓存 uRLConnection.setInstanceFollowRedirects(false);//不自动重定向 uRLConnection.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);//设置请求头 uRLConnection.setRequestProperty("connection", "keep-alive");//保持连接 uRLConnection.setRequestProperty("Charset", CHARSET); uRLConnection.setConnectTimeout(10000);//请求超时时间 //开始请求连接 uRLConnection.connect(); //获取输出流 DataOutputStream out = new DataOutputStream( uRLConnection.getOutputStream()); /*** * 以下先是用于上传参数 */ if (param != null && param.size() > 0) { Iterator<String> it = param.keySet().iterator(); while (it.hasNext()) { StringBuffer sb = new StringBuffer(); String key = it.next(); String value = param.get(key); sb.append(PREFIX).append(BOUNDARY).append(LINE_END); sb.append("Content-Disposition: form-data; name=\"") .append(key).append("\"").append(LINE_END) .append(LINE_END); sb.append(value).append(LINE_END); String params = sb.toString(); Log.i(TAG, key + "=" + params + "##"); out.write(params.getBytes()); // dos.flush(); } } //参数上传完开始上传文件 if (file != null) { StringBuffer sb = new StringBuffer(); sb.append(PREFIX); sb.append(BOUNDARY); sb.append(LINE_END); /** * 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件 * filename是文件的名字，包含后缀名 */ if (null != newFileName && "" != newFileName) { sb.append("Content-Disposition: form-data; name=\"" + fileKey + "\"; filename=\"" + newFileName + "\"" + LINE_END); } else { sb.append("Content-Disposition: form-data; name=\"" + fileKey + "\"; filename=\"" + file.getName() + "\"" + LINE_END); } sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END); sb.append(LINE_END); out.write(sb.toString().getBytes()); InputStream isinput = new FileInputStream(file); byte[] bytes = new byte[1024]; int len = 0; while ((len = isinput.read(bytes)) != -1) { out.write(bytes, 0, len); } out.write(LINE_END.getBytes()); byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END) .getBytes(); out.write(end_data); isinput.close(); out.flush(); } int i = uRLConnection.getResponseCode(); Log.i("i", i + ""); if (i == 200) { InputStream is = uRLConnection.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(is)); String readLine = null; while ((readLine = br.readLine()) != null) { // response = br.readLine(); response = readLine; } is.close(); br.close(); } else { response = uRLConnection.getResponseCode() + ""; } //关闭连接 uRLConnection.disconnect(); } catch (Exception e) { return e.getMessage(); } Log.i(TAG, "到服务器拿response" + response); return response; }
