优点 (版本一)
优点 (版本二)
1)支持http2,对一台机器的所有请求共享同一个socket
2)内置连接池,支持连接复用,减少延迟
3)支持透明的gzip压缩响应体
4)通过缓存避免重复的请求
5)请求失败时自动重试主机的其他ip,自动重定向
6)好用的API
功能
首先记得在build.gradle 和 配置文件分别加上依赖 和 网络权限
compile 'com.squareup.okhttp3:okhttp:3.8.0'
compile 'com.squareup.okio:okio:1.12.0'
异步GET请求的4个步骤:
注意事项:
实例:
我新建了一个活动,并在布局里放入一个按钮,点击就会开始执行网络请求
private void getRequest() {
//1.创建OkHttpClient对象
OkHttpClient okHttpClient = new OkHttpClient();
//2.创建Request对象,设置一个url地址(百度地址),设置请求方式。
Request request = new Request.Builder().url("http://www.baidu.com").method("GET",null).build();
//3.创建一个call对象,参数就是Request请求对象
Call call = okHttpClient.newCall(request);
//4.请求加入调度,重写回调方法
call.enqueue(new Callback() {
//请求失败执行的方法
@Override
public void onFailure(Call call, IOException e) {
}
//请求成功执行的方法
@Override
public void onResponse(Call call, Response response) throws IOException {
String data = response.body().string();
Log.d("response",data);
runOnUiThread(new Runnable() {
@Override
public void run() {
//更新UI
}
});
}
});
}
//1.创建OkHttpClient对象
OkHttpClient okHttpClient = new OkHttpClient();
//2.创建Request对象,设置一个url地址(百度地址),设置请求方式。
Request request = new Request.Builder().url("http://www.baidu.com").method("GET",null).build();
//3.创建一个call对象,参数就是Request请求对象
Call call = okHttpClient.newCall(request);
//4.同步调用会阻塞主线程,这边在子线程进行
new Thread(new Runnable() {
@Override
public void run() {
try {
//同步调用,返回Response,会抛出IO异常
Response response = call.execute();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
private void postAsynHttp() {
mOkHttpClient=new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("size", "10")
.build();
Request request = new Request.Builder()
.url("http://api.1-blog.com/biz/bizserver/article/list.do")
.post(formBody)
.build();
Call call = mOkHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String str = response.body().string();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(), "请求成功", Toast.LENGTH_SHORT).show();
}
});
}
});
}
// step 1: 创建 OkHttpClient 对象
OkHttpClient okHttpClient = new OkHttpClient();
//step 2:创建 RequestBody 以及所需的参数
//2.1 获取文件
File file = new File(Environment.getExternalStorageDirectory() + "test.txt");
//2.2 创建 MediaType 设置上传文件类型
MediaType MEDIATYPE = MediaType.parse("text/plain; charset=utf-8");
//2.3 获取请求体
RequestBody requestBody = RequestBody.create(MEDIATYPE, file);
//step 3:创建请求
Request request = new Request.Builder().url("http://www.baidu.com")
.post(requestBody)
.build();
//step 4 建立联系
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
// 请求失败
}
@Override
public void onResponse(Call call, Response response) throws IOException {
// 请求成功
}
});
private void downAsynFile() {
mOkHttpClient = new OkHttpClient();
String url = "https://img-my.csdn.net/uploads/201603/26/1458988468_5804.jpg";
Request request = new Request.Builder().url(url).build();
mOkHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) {
InputStream inputStream = response.body().byteStream();
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(new File("/sdcard/123.jpg"));
byte[] buffer = new byte[2048];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
fileOutputStream.write(buffer, 0, len);
}
fileOutputStream.flush();
} catch (IOException e) {
e.printStackTrace();
}
Log.d("123", "文件下载成功");
}
});
}
【待补充】其实这种需求我在实际开发中暂时没有遇到过,也不是很理解
//1.创建OkHttpClient对象
OkHttpClient okHttpClient = new OkHttpClient();
//上传的图片
File file = new File(Environment.getExternalStorageDirectory(), "zhuangqilu.png");
//2.通过new MultipartBody build() 创建requestBody对象,
RequestBody requestBody = new MultipartBody.Builder()
//设置类型是表单
.setType(MultipartBody.FORM)
//添加数据
.addFormDataPart("username","zhangqilu")
.addFormDataPart("age","25")
.addFormDataPart("image","zhangqilu.png",
RequestBody.create(MediaType.parse("image/png"),file))
.build();
//3.创建Request对象,设置URL地址,将RequestBody作为post方法的参数传入
Request request = new Request.Builder().url("url").post(requestBody).build();
//4.创建一个call对象,参数就是Request请求对象
Call call = okHttpClient.newCall(request);
//5.请求加入调度,重写回调方法
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
}
});
File sdcache = getExternalCacheDir();
int cacheSize = 10 * 1024 * 1024;
OkHttpClient.Builder builder = new OkHttpClient.Builder()
.connectTimeout(15, TimeUnit.SECONDS)
.writeTimeout(20, TimeUnit.SECONDS)
.readTimeout(20, TimeUnit.SECONDS)
.cache(new Cache(sdcache.getAbsoluteFile(), cacheSize));
OkHttpClient mOkHttpClient=builder.build();
Request.Builder builder = new Request.Builder().url(url);
builder.addHeader("X-UA","android");
自己主动取消的错误的 java.net.SocketException: Socket closed
超时的错误是 java.net.SocketTimeoutException
网络出错的错误是java.net.ConnectException: Failed to connect to xxxxx
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
if(e.toString().contains("closed")) {
//如果是主动取消的情况下
}else{
//其他情况下
}
}
call.cancel()
都可以okhttpclient.dispatcher().cancelAll();
来源:https://www.jianshu.com/p/16ab28d40737