Android中实现OkHttp上传文件到服务器并带进度

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

来源：http://blog.csdn.net/gary__123456/article/details/74159042