36. 网络加载框架OkHttp的同步与异步请求
36.1 简介
官方地址
https://github.com/square/okhttp
android网络框架之OKhttp
一个处理网络请求的开源项目,是安卓端最火热的轻量级框架,由移动支付Square公司贡献(该公司还贡献了Picasso) 。
用于替代HttpUrlConnection和Apache HttpClient(android API23 6.0里已移除HttpClient,现在已经打不出来)
36.2 基本配置
引入依赖
最新4.10
同步
服务器
一个开源项目，测试各种请求
https://www.httpbin.org/
清单文件中加上网络权限
36.3 OkHttp基本用法
布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="getSync"
android:text="get同步请求"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="getAsync"
android:text="get异步请求"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="postSync"
android:text="post同步请求"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="postAsync"
android:text="post异步请求"
/>
</LinearLayout>
四个按钮
四个点击响应事件：
创建OkhttpClient实例对象
36.4 get同步请求
//get同步请求
public void getSync(View view) {
new Thread(){
@Override
public void run() {
Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();
//准备好请求的Call对象
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
Log.e("dingjiaxiong", "getSync: " + response.body().string() );
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
运行
36.5 get异步请求
//get异步请求(这个就不需要自己创建线程)
public void getAsync(View view) {
Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();
//准备好请求的Call对象
Call call = okHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
if (response.isSuccessful()){
Log.e("dingjiaxiong", "get异步请求: " + response.body().string() );
}
}
});
}
运行
36.6 post同步请求
//post同步请求
public void postSync(View view) {
new Thread(new Runnable() {
@Override
public void run() {
FormBody formBody = new FormBody.Builder().add("a", "1").add("b", "2").build();
Request request = new Request.Builder().url("https://www.httpbin.org/post")
.post(formBody)
.build();
Call call = okHttpClient.newCall(request);
try {
Response response = call.execute();
Log.e("dingjiaxiong", "postSync: " + response.body().string() );
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
36.7 post异步请求
//post异步请求
public void postAsync(View view) {
FormBody formBody = new FormBody.Builder().add("a", "1").add("b", "2").build();
Request request = new Request.Builder().url("https://www.httpbin.org/post")
.post(formBody)
.build();
Call call = okHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
Log.e("dingjiaxiong", "post异步请求: " + response.body().string() );
}
});
}
36.8 post请求数据格式
常用的编码方式
https://www.runoob.com/http/http-content-type.html
默认的form表单提交方式，数据被编码为名称/值对，默认类型；
数据被编码为一条消息，一般用于文件上传。
提交二进制数据，如果用于文件上传，只能上传一个文件。
提交json数据。
post上传两个文件测试：
@Test
public void uploadFileTest() throws IOException {
OkHttpClient okHttpClient = new OkHttpClient();
File file1 = new File("D:\\DingJiaxiong\\AndroidStudioProjects\\MyOkhttp\\app\\src\\test\\java\\com\\dingjiaxiong\\myokhttp\\1.txt");
File file2 = new File("D:\\DingJiaxiong\\AndroidStudioProjects\\MyOkhttp\\app\\src\\test\\java\\com\\dingjiaxiong\\myokhttp\\2.txt");
MultipartBody multipartBody = new MultipartBody.Builder()
.addFormDataPart("file1", file1.getName(), RequestBody.create(file1, MediaType.parse("text/plain")))
.addFormDataPart("file2", file2.getName(), RequestBody.create(file2, MediaType.parse("text/plain")))
.build();
Request request = new Request.Builder().url("https://www.httpbin.org/post").post(multipartBody).build();
Call call = okHttpClient.newCall(request);
Response response = call.execute();
System.out.println(response.body().string());
}
上传json数据测试
@Test
public void jsonTest() throws IOException {
OkHttpClient okHttpClient = new OkHttpClient();
RequestBody requestBody = RequestBody.create("{\"a\":1,\"b\":2}", MediaType.parse("application/json"));
Request request = new Request.Builder().url("https://www.httpbin.org/post").post(requestBody).build();
Call call = okHttpClient.newCall(request);
Response response = call.execute();
System.out.println(response.body().string());
}
