目录

概述

get请求

post请求

post文件上传

post上传字符串

概述

第一步，app/build.gradle里添加okhttp3的依赖，分为Okhttp，和logging-interceptor

    // define a BOM and its versionimplementation(platform("com.squareup.okhttp3:okhttp-bom:4.10.0"))// define any required OkHttp artifacts without versionimplementation("com.squareup.okhttp3:okhttp")implementation("com.squareup.okhttp3:logging-interceptor")

第二步，AndroidManifest.xml里添加网络权限

<uses-permission android:name="android.permission.INTERNET">
</uses-permission>

第三步，新建网络请求类Hiokhttp

get请求

1. 通过OkHttpClient构造client对象
2. 通过Request.Builder构建一个request实例（要在子线程里完成）
3. 通过client.newCall构建Call实例
4. 通过call.execute发起同步请求/通过call.enqueue发起异步请求
5. 通过response转String类型接收响应结果

同步请求execute，会阻塞线程，因此需要在子线程完成

object Hiokhttp {private const val TAG = "Hiokhttp"private var BASE_URL = "https://jsonplaceholder.typicode.com/users"//构造Http对象private var client:OkHttpClient = OkHttpClient().newBuilder().connectTimeout(10L,TimeUnit.SECONDS).readTimeout(10L,TimeUnit.SECONDS).writeTimeout(10L,TimeUnit.SECONDS).build()//发起同步请求fun getExe(){Thread {//构造请求体requestval request = Request.Builder().url("$BASE_URL?id=2").get().build()//发起call请求val call: Call = client.newCall(request)//同步请求val response = call.execute()//接收返回响应val result = response.body?.string()Log.d(TAG, "result:{$result}")}.start()}}

异步请求enqueue，无需创建子线程发起请求。

无论同步还是异步请求，onFailure、onResponse的回调都是在子线程，我们需要切换到主线程才能操作UI控件。

子线程切换的方式有handle和runOnUiThread()

//发起异步请求fun getEnq(){//构造请求体requestval request = Request.Builder().url("$BASE_URL?id=3").get().build()//发起call请求val call: Call = client.newCall(request)//异步请求call.enqueue(object :Callback{override fun onFailure(call: Call, e: IOException) {Log.d(TAG, "onFailure IOException:{$e}")}override fun onResponse(call: Call, response: Response) {//接收返回响应val result = response.body?.string()Log.d(TAG, "result:{$result}")}})

post请求

post请求与get请求类似，不同在于，post方法接收的是FormBody.Builder()构造的body对象

 //post发起同步请求fun postExe(){val body: RequestBody = FormBody.Builder().add("id","1").build()val request = Request.Builder().url(BASE_URL).post(body).build()Thread(Runnable {val call = client.newCall(request)val response  = call.execute()val result = response.body?.string()Log.d(TAG,"result:{$result}")}).start()}//post发起异步请求fun postAsync(){val body = FormBody.Builder().add("id","2").build()val request = Request.Builder().url(BASE_URL).post(body).build()client.newCall(request).enqueue(object:Callback{override fun onFailure(call: Call, e: IOException) {Log.d(TAG, "onFailure IOException:{$e}")}override fun onResponse(call: Call, response: Response) {//接收返回响应val result = response.body?.string()Log.d(TAG, "result:{$result}")}})}

post文件上传

post文件上传，需要MultiPartBody.Builder()构造的body对象

    fun postMult() {val file = File(Environment.getExternalStorageDirectory(), "logo.png")if (!file.exists()) {return}val body = MultipartBody.Builder().addFormDataPart("key", "value").addFormDataPart("key1", "value1").addFormDataPart("file", "logo.png",file.asRequestBody("application/octet-stream".toMediaType())).build()val request = Request.Builder().url("支持文件上传的接口").post(body).build()client.newCall(request).enqueue(object : Callback {override fun onFailure(call: Call, e: IOException) {TODO("Not yet implemented")}override fun onResponse(call: Call, response: Response) {TODO("Not yet implemented")}})}

post上传字符串

post也支持上传字符串，字符串类型可以text,也可以json字符串。

    fun postString() {//上传json字符串val json = JSONObject().put("key", "value").put("key1", "value1").toString()val body = json.toRequestBody("application/json;charset=utf-8".toMediaType())//上传文本格式的字符串，注意MediaType类型val text = "text text text"val body1 = text.toRequestBody("text/plain;charset-utf-8".toMediaType())val request =Request.Builder().url("支持上传字符串的接口，这个字符串可以是json,也可以是text文本").post(body).build()client.newCall(request).enqueue(object : Callback {override fun onFailure(call: Call, e: IOException) {TODO("Not yet implemented")}override fun onResponse(call: Call, response: Response) {TODO("Not yet implemented")}})}