【移动应用开发技术】Android中怎么利用OkHttp上传文件到服务器

【移动应用开发技术】Android中怎么利用OkHttp上传文件到服务器

Android中怎么利用OkHttp上传文件到服务器，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。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"

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

=

"04:8080/OkHttpServer/UploadFileServlet";

OkHttpUtil.postFile(postUrl,

new

ProgressListener()

{

@Override

public

void

onProgress(long

currentBytes,

long

contentLength,

boolean

done)

{

Log.i(TAG,

"currentBytes=="

+

currentBytes

+

"==contentLength=="

+

conten