android 开发中使用okhttp上传文件到服务器

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
  compileSdkVersion 26
  defaultConfig {
    applicationId "com.cofox.mykt.myweather"
    minSdkVersion 19
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
  }
  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  }
  sourceSets {
    main {
      res.srcDirs =
          [
              'src/main/res/layout/menufunction',
              'src/main/res'
          ]
    }
  }
}
dependencies {
  implementation fileTree(dir: 'libs', include: ['*.jar'])
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
  implementation 'com.android.support:appcompat-v7:26.1.0'  implementation 'com.android.support.constraint:constraint-layout:1.0.2'
  testImplementation 'junit:junit:4.12'  androidTestImplementation 'com.android.support.test:runner:1.0.1' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
  implementation 'org.jetbrains.anko:anko-sdk19:0.10.3'
  implementation 'org.jetbrains.anko:anko-support-v4:0.10.3'
  implementation 'org.jetbrains.anko:anko-appcompat-v7:0.10.3'
  implementation 'com.google.code.gson:gson:2.7'
implementation 'com.android.support:percent:26.1.0'
  implementation 'com.squareup.okhttp3:okhttp:3.8.1'
}

<Button
      android:id="@+id/btnOkHttpUploadFilePost"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_weight="1"
      android:text="OkHttp上传文件(POST)"
      android:textAllCaps="false" />
  <ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <TextView
      android:id="@+id/ttviewResponse"
      android:layout_width="match_parent"
      android:layout_height="match_parent" />
  </ScrollView>

//设置访问服务端IP
  var serverIp = "192.168.1.105"

//post方式上传文件（sd卡跟路径image.png文件）
    btnOkHttpUploadFilePost.setOnClickListener {
      Thread {
        try {
          val url = "http://" + serverIp + "/upload"
          val file = File("/sdcard/image.png")
          val fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file)
          val requestBody = MultipartBody.Builder()
              .setType(MultipartBody.FORM)
              .addFormDataPart("uploadfile", "image.png", fileBody)
              .build()
          val request = Request.Builder()
              .url(url)
              .post(requestBody)
              .build()
          val httpBuilder = OkHttpClient.Builder()
          val okHttpClient = httpBuilder
              .connectTimeout(10, java.util.concurrent.TimeUnit.SECONDS)
              .writeTimeout(15, java.util.concurrent.TimeUnit.SECONDS)
              .build()
          val response = okHttpClient.newCall(request).execute()
          val responseStr = response.body()?.string()
          runOnUiThread { ttviewResponse.text = responseStr }
        } catch (e: Exception) {

        }
      }.start()
    }