在上一讲中 OkHttp下载文件并带进度条 中，我们知道怎样去下载文件了。那上传文件呢
一、编写服务器端
在上一讲服务器下新建UploadFileServlet，代码如下：然后重启服务器！
@WebServlet("/UploadFileServlet") @MultipartConfig public class UploadFileServlet extends HttpServlet { private static final long serialVersionUID = 1L; public UploadFileServlet() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse * response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("doPost=="); request.setCharacterEncoding("utf-8"); //获取file命名的part，注意要与Android端一样 Part part = request.getPart("file"); // 获取请求头，请求头的格式：form-data; name="file"; filename="snmp4j--api.zip" String header = part.getHeader("content-disposition"); System.out.println(header); String fileName = getFileName(header); // 存储路径 String savePath = "D:/huang/upload"; // 把文件写到指定路径 part.write(savePath + File.separator + fileName); response.setCharacterEncoding("UTF-8"); PrintWriter writer = response.getWriter(); writer.print("上传成功"); } public String getFileName(String header) { /** * header 为 form-data; name="file"; filename="dial.png" * String[] tempArr1 = * header.split(";");代码执行完之后，在不同的浏览器下，tempArr1数组里面的内容稍有区别 * 火狐或者google浏览器下：tempArr1={form-data,name="file",filename= * "snmp4j--api.zip"} * IE浏览器下：tempArr1={form-data,name="file",filename="E:\snmp4j--api.zip"} */ String[] tempArr1 = header.split(";"); /** * 火狐或者google浏览器下：tempArr2={filename,"snmp4j--api.zip"} * IE浏览器下：tempArr2={filename,"E:\snmp4j--api.zip"} */ String[] tempArr2 = tempArr1[2].split("="); // 获取文件名，兼容各种浏览器的写法 String fileName = tempArr2[1].substring(tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", ""); return fileName; } }
二、Android端
1.布局，上一讲activity_main代码中添加 ：
<Button android:id="@+id/ok_post_file" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="上传文件" /> <TextView android:id="@+id/post_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center" android:text="0" /> <ProgressBar android:id="@+id/post_progress" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="100" />
2.OkHttpUtil新增上传文件方法：
public static void postFile(String url, final ProgressListener listener, Callback callback, File...files){ MultipartBody.Builder builder = new MultipartBody.Builder(); builder.setType(MultipartBody.FORM); Log.i("huang","files[0].getName()=="+files[0].getName()); //第一个参数要与Servlet中的一致 builder.addFormDataPart("file",files[0].getName(), RequestBody.create(MediaType.parse("application/octet-stream"),files[0])); MultipartBody multipartBody = builder.build(); Request request = new Request.Builder().url(url).post(new ProgressRequestBody(multipartBody,listener)).build(); okHttpClient.newCall(request).enqueue(callback); }
3.ProgressRequestBody是自定义RequestBody类，用来监听进度：
public class ProgressRequestBody extends RequestBody { public static final int UPDATE = 0x01; private RequestBody requestBody; private ProgressListener mListener; private BufferedSink bufferedSink; private MyHandler myHandler; public ProgressRequestBody(RequestBody body, ProgressListener listener) { requestBody = body; mListener = listener; if (myHandler==null){ myHandler = new MyHandler(); } } class MyHandler extends Handler { //放在主线程中显示 public MyHandler() { super(Looper.getMainLooper()); } @Override public void handleMessage(Message msg) { switch (msg.what){ case UPDATE: ProgressModel progressModel = (ProgressModel) msg.obj; if (mListener!=null)mListener.onProgress(progressModel.getCurrentBytes(),progressModel.getContentLength(),progressModel.isDone()); break; } } } @Override public MediaType contentType() { return requestBody.contentType(); } @Override public long contentLength() throws IOException { return requestBody.contentLength(); } @Override public void writeTo(BufferedSink sink) throws IOException { if (bufferedSink==null){ bufferedSink = Okio.buffer(sink(sink)); } //写入 requestBody.writeTo(bufferedSink); //刷新 bufferedSink.flush(); } private Sink sink(BufferedSink sink) { return new ForwardingSink(sink) { long bytesWritten = 0L; long contentLength = 0L; @Override public void write(Buffer source, long byteCount) throws IOException { super.write(source, byteCount); if (contentLength==0){ contentLength = contentLength(); } bytesWritten += byteCount; //回调 Message msg = Message.obtain(); msg.what = UPDATE; msg.obj = new ProgressModel(bytesWritten,contentLength,bytesWritten==contentLength); myHandler.sendMessage(msg); } }; } }
4.在MainActivity添加上传按钮点击事件，代码如下：
File file = new File(basePath + "/1.mp4"); String postUrl = "http://192.168.0.104:8080/OkHttpServer/UploadFileServlet"; OkHttpUtil.postFile(postUrl, new ProgressListener() { @Override public void onProgress(long currentBytes, long contentLength, boolean done) { Log.i(TAG, "currentBytes==" + currentBytes + "==contentLength==" + contentLength + "==done==" + done); int progress = (int) (currentBytes * 100 / contentLength); post_progress.setProgress(progress); post_text.setText(progress + "%"); } }, new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null) { String result = response.body().string(); Log.i(TAG, "result===" + result); } } }, file);
相关效果图：
上传完成后，在电脑D:\huang\upload下可以看到：
源码下载
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。