Android中实现OkHttp上传文件到服务器并带进度

Posted 2020-10-16

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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;
}
}

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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" />

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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);
}

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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);
}
};
}
}

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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);

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