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如何在Android中利用OkHttp实现一个图片上传功能

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实现方法如下：

object UploadFileHelper {
 //--------ContentType
 private val MEDIA_OBJECT_STREAM = MediaType.parse("multipart/form-data")
 //--------上传延时时间
 private val WRITE_TIME_OUT:Long = 50
 private val mOkHttpClient by lazy { OkHttpClient() }
 //------基本参数----------
 val version = AppConstant.API_VERSION
 val platform = AppConstant.API_PLATFORM
 val methodName = AppConstant.API_UPLOADFILE_METHOD
 val token = ignoreException("") { UserModel.token() }
 val userId = ignoreException(0) { UserModel.id() }
 //------------------------
 //不带参数同步上传文件
 fun syncUploadFile(actionUrl: String = "",file: File,maxW: Int = 256,maxH: Int = 256):String?{
  val uploadFile = optionFileSize(file,maxW,maxH,null)
  if(uploadFile!=null){
   val response = createNoParamsOkHttpCall(actionUrl,uploadFile).execute()
   if(uploadFile.exists())
    uploadFile.delete()
   return getResponseToPath(response.body()!!.string())
  }
  return null
 }
 //不带参数异步上传文件
 fun asyncUploadFile(actionUrl:String = "", file: File,maxW: Int = 256,maxH: Int = 256,
      uploadCallBackListener: UploadCallBackListener? = null){
  val uploadFile = optionFileSize(file,maxW,maxH,uploadCallBackListener)
  if(uploadFile!=null)
  createNoParamsOkHttpCall(actionUrl,uploadFile).enqueue(object: Callback{
   override fun onFailure(c: Call, e: IOException) {
    uploadCallBackListener?.onUploadFailure(e.toString())
   }
   override fun onResponse(c: Call, response: Response) {
    if(uploadFile.exists())
    uploadFile.delete()

     uploadCallBackListener?.onUploadSuccess(getResponseToPath(response.body()!!.string()))
    response.body()!!.close()
   }
  })
 }
 //带参数同步上传文件
 fun syncParamsUploadFile(actionUrl: String= "",file: File,params:HashMap,
      maxW: Int = 256,maxH: Int = 256):String?{
  val uploadFile = optionFileSize(file,maxW,maxH,null)
  if(uploadFile!=null){
   params.put("filename",uploadFile)
   val response = createParamsOkHttpCall(actionUrl,params,null,false).execute()
   if(uploadFile.exists())
    uploadFile.delete()
   return getResponseToPath(response.body()!!.string())
  }
  return null
 }
 //带参数异步上传文件
 fun asyncParamsUploadFile(actionUrl: String= "",file: File,params:HashMap,maxW: Int = 256,maxH: Int = 256,
      uploadCallBackListener: UploadCallBackListener? = null, isProgress:Boolean = true){
  val uploadFile = optionFileSize(file,maxW,maxH,uploadCallBackListener)
  if(uploadFile!=null){
   params.put("filename",uploadFile)
   createParamsOkHttpCall(actionUrl,params,uploadCallBackListener,isProgress).enqueue(object :Callback{
    override fun onFailure(c: Call, e: IOException) {
     uploadCallBackListener?.onUploadFailure(e.toString())
    }
    override fun onResponse(c: Call, response: Response) {
      if(uploadFile.exists())
      uploadFile.delete()
     uploadCallBackListener?.onUploadSuccess(getResponseToPath(response.body()!!.string()))
     response.body()!!.close()
    }
   })
  }
 }
 //------创建一个没有带参数的Call
 fun createNoParamsOkHttpCall(actionUrl: String,file: File):Call{
  val requestUrl = "${AppConstant.HOST}/$actionUrl"
  val requestBody = RequestBody.create(MEDIA_OBJECT_STREAM,file)
  val request = Request.Builder().url(requestUrl).post(requestBody).build()
  return mOkHttpClient.newBuilder().writeTimeout(WRITE_TIME_OUT,TimeUnit.SECONDS).build().newCall(request)
 }
 //------创建一个带参数的Call
 fun createParamsOkHttpCall(actionUrl: String,params:Map,
        uploadCallBackListener: UploadCallBackListener? = null,
        isProgress:Boolean = true):Call{
  //-----AppConstant.HOST 上传图片的Server的BASE_URL http://xxx.com
  val requestUrl = "${AppConstant.HOST}/$actionUrl"
  val builder = MultipartBody.Builder()
  builder.setType(MultipartBody.FORM)
  val newParams = mutableMapOf(
    "version" to version,
    "platform" to platform,
    "methodName" to methodName,
    "token" to token,
    "user_id" to userId)
  newParams.putAll(params)
  newParams.forEach( action = {
   if(it.value is File){
    builder.addFormDataPart(it.key, (it.value as File).name,
    if(isProgress) createProgressRequestBody(MEDIA_OBJECT_STREAM!!,(it.value as File),uploadCallBackListener)
    else RequestBody.create(null, (it.value as File)))
   }else{
    builder.addFormDataPart(it.key,it.value.toString())
   }
  })
  val body = builder.build()
  val request = Request.Builder().url(requestUrl).post(body).build()
  return mOkHttpClient.newBuilder().writeTimeout(WRITE_TIME_OUT,TimeUnit.SECONDS).build().newCall(request)

 }

 //创建带进度RequestBody
 fun createProgressRequestBody(contentType:MediaType,file:File,
         uploadCallBackListener: UploadCallBackListener? = null):RequestBody{
  return object:RequestBody(){
   override fun contentType(): MediaType = contentType
   override fun contentLength() = file.length()
   override fun writeTo(sink: BufferedSink) {
    ignoreException {
     val source = Okio.source(file)
     val buf = Buffer()
     val remaining = contentLength()
     var current: Long = 0
     var readCount: Long = source.read(buf, 2048)
     while (readCount != -1L) {
      sink.write(buf, readCount)
      current += readCount
      uploadCallBackListener?.onUploadProgress(current,remaining)
      readCount = source.read(buf, 2048)
     }

    }
   }
  }
 }
 //根据图片大小简单压缩
 fun optionFileSize(file: File,maxW:Int,maxH:Int,uploadCallBackListener: UploadCallBackListener?):File?{
  try {
   val uploadFile = File(AppBridge.AppContext().externalCacheDir, file.hashCode().toString())
   ImageUtils.resize(file, maxW, maxH, uploadFile)
   return uploadFile
  } catch (e: Exception) {
   uploadCallBackListener?.onUploadFailure("压缩图片失败")
   return null
  }

 }
 //解析Server返回的数据获取图片路径，
 /*
  {"code":200,"msg":"上传成功","data":{"path":""}}
 */
 fun getResponseToPath(response:String):String{
  val dataJsonObj = JSONObject(response).get("data") as JSONObject
  return dataJsonObj.get("path") as String
 }
 //回调方法
 interface UploadCallBackListener{
  fun onUploadFailure(error:String)
  fun onUploadProgress(currentSize:Long,totalSize:Long)
  fun onUploadSuccess(path:String)
 }
}
inline fun  ignoreException(def: T, f: () -> T): T {
 try {
  return f()
 } catch(e: Exception) {
  Timber.e(e, "")
  return def
 }
}

最后根据是否要带参数、同步或异步调用其中对应的方法可以了

syncUploadFile(xxx)

asyncUploadFile(xxx)

syncParamsUploadFile(xxx)

asyncParamsUploadFile(xxx)

总结

首先根据是否要带参数上传，如果不带参数上传，直接创建RequestBody;如果带参数上传,创建MultipartBody.Builder(),然后把所有参数addFormDataPart进去，其中addFormDataPart方法有个RequestBody参数通过是否要监听进度创建，如果需要进度，需重写RequestBody的writeTo()方法，如果不监听进度，直接创建RequestBody，最后builder.build()得到RequestBody

通过上步骤得到的RequestBody以及上传图片的Server路径，可以配置出一个Request对象。

把Request对象通过.newCall(request)配置在OkHttpClient得到Call对象

最后Call调用同步.execute()或者异步.enqueue(callBack),在回调里面处理返回的数据。

以上就是如何在Android中利用OkHttp实现一个图片上传功能，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。


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