android文件上传前后端实现，okhttp+servlet

#android端 okhttp的项目地址github

private void asyncSendFile(String filename){//在子线程中实现网络操作，传入文件名 //获取文件夹 String filepath = Environment.getExternalStorageDirectory().getPath() + "/temp"; File file = new File(filepath, filename); //文件夹存在，文件存在开启新线程进行传输 if(file.exists() && file.isFile()){ new Thread(new Runnable() { @Override public void run() { OkHttpClient okHttpClient = new OkHttpClient(); MediaType mediaType = MediaType.parse("text/x-markdown; charset=utf-8");//设置头信息 //新建请求 RequestBody requestBody = RequestBody.create(wavfile, mediaType); Request request = new Request.Builder() .url(url_file) .post(requestBody).build(); //发起请求，并重写回调函数 okHttpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NotNull Call call, @NotNull IOException e) { showLogMsg(LoginActivity.this, 0, "请求服务器失败："+e.getMessage()); } @Override public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException { //获取回复消息，使用json形式处理 String resData = response.body().string(); try { JSONArray jsonArray = new JSONArray(resData); JSONObject jsonObject = jsonArray.getJSONObject(0); String sendOk = jsonObject.getString("sendOk"); if(sendOk.equals("true")){ Snackbar.make(getWindow().getDecorView(), "发送成功", Snackbar.LENGTH_SHORT).show(); }else{ Snackbar.make(getWindow().getDecorView(), "发送失败", Snackbar.LENGTH_SHORT).show(); } } catch (JSONException e) { e.printStackTrace(); } } }); } }).start(); }else{ Toast.makeText(LoginActivity.this, "录制失败，请重新尝试", Toast.LENGTH_SHORT).show(); } }

#服务器端servlet实现

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); ServletInputStream is = request.getInputStream(); String filepath = "E:/"; String filename = "1.txt" File file0 = new File(filepath); if(!file0.exists()) { file0.mkdirs(); } File file = new File(filepath, filename); if(!file.exists()) { file.createNewFile(); } FileOutputStream fos = new FileOutputStream(file); int len = 0; byte[] buf = new byte[1024]; while((len = is.read(buf)) != -1) { fos.write(buf, 0, len); } fos.flush(); fos.close(); JSONArray jsonArray3 = new JSONArray(); JSONObject jsonObject3 = new JSONObject(); jsonObject3.put("sendOk", "true"); jsonArray3.add(jsonObject3); PrintWriter out = response.getWriter(); out.println(jsonArray3); }