簡介
OkHttp是一款適用于Android和Java應(yīng)用程序的HTTP&HTTP2客戶端。它有如下特性：
- 支持http2昧诱，對一臺機器的所有請求共享同一個socket
- 內(nèi)置連接池畔塔，支持連接復(fù)用潭辈，減少延遲
- 支持透明的gzip壓縮響應(yīng)體
- 通過緩存避免重復(fù)的請求
- 請求失敗時自動重試主機的其他ip，自動重定向
- 好用的API
引入
以Java為例澈吨，通常使用Maven構(gòu)建方式把敢，在pom文件中加入依賴。
<dependency>
<groupId>com.squareup.okhttp3</groupId>
<artifactId>okhttp</artifactId>
<version>3.9.1</version>
</dependency>
get請求
- 先實例化okhttp谅辣，構(gòu)建一個request修赞，由于get是默認(rèn)方式，所以設(shè)置一個url地址就可以了桑阶，也可以通過Request.Builder設(shè)置更多的參數(shù)柏副。
- 然后通過client創(chuàng)建一個call對象并發(fā)送請求。
- 通過response.body().string()獲取返回的字符串蚣录。這個body()其實就是ResponseBody對象割择。
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(url)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
post請求
- 提交字符串
OkHttpClient client = new OkHttpClient();
MediaType mediaType = MediaType.parse("text/plain; charset=utf-8");
String str = "abcd";
RequestBody body = RequestBody.create(mediaType, str);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
- 提交json
OkHttpClient client = new OkHttpClient();
MediaType mediaType = MediaType.parse("application/json; charset=utf-8");
String json = "{'name':'kmt','sex':'man'}";
RequestBody body = RequestBody.create(mediaType, json);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
- 提交form表單
OkHttpClient client = new OkHttpClient();
RequestBody body = new FormBody.Builder()
.add("name", "kmt")
.add("sex", "man")
.build();
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
- 上傳文件
OkHttpClient client = new OkHttpClient();
MediaType mediaType = MediaType.parse("image/png");
File file = new File("/file/test.png");
RequestBody body = RequestBody.create(mediaType, file);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
- 提交分塊請求
OkHttpClient client = new OkHttpClient();
MediaType mediaType = MediaType.parse("image/png");
File file = new File("/file/test.png");
RequestBody fileBody = RequestBody.create(mediaType, file);
RequestBody requestBody = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart("file", "test_img", fileBody)
.addFormDataPart("name", "kmt")
.build();
Request request = new Request.Builder()
.url(url)
.post(requestBody)
.build();
Response response = client.newCall(request).execute();
String responseBody = response.body().string();
其他
- 設(shè)置超時時間
OkHttpClient client = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.readTimeout(10,TimeUnit.SECONDS)
.writeTimeout(10,TimeUnit.SECONDS)
.build();
- 添加請求頭
Request request = new Request.Builder()
.url(url)
.addHeader("authorization", authorization)
.addHeader("content-type", "application/x-www-form-urlencoded")
.addHeader("cache-control", "no-cache")
.post(body)
.build();
- 異步
client.newCall(request).execute()是同步的，client.newCall(request).enqueue()是異步的萎河。onFailure是請求失敗執(zhí)行的方法荔泳，onResponse是請求成功執(zhí)行的方法。
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String responseBody = response.body().string();
}
});
