OKHTTP3的简单使用，表单提交，json传递

OKHTTP3的简单使用

使用okhttp3需引入以下依赖

compile 'com.squareup.okio:okio:1.13.0'
compile 'com.squareup.okhttp3:okhttp:3.9.0'

1.okhttp GET方式请求

//创建OkHttpClient对象
OkHttpClient okHttpClient  = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10,TimeUnit.SECONDS)
.readTimeout(20, TimeUnit.SECONDS)
.build();

final Request request = new Request.Builder()
.url("http://172.20.192.168:8080/getbookByFrom?name=android基础&price=50")//请求的url
.get()//设置请求方式，get()/post()  查看Builder()方法知，在构建时默认设置请求方式为GET
.build(); //构建一个请求Request对象

//创建/Call
Call call = okHttpClient.newCall(request);
//加入队列 异步操作
call.enqueue(new Callback() {
//请求错误回调方法
@Override
public void onFailure(Call call, IOException e) {
System.out.println("连接失败");
}
//异步请求(非主线程)
@Override
public void onResponse(Call call, Response response) throws IOException {
if(response.code()==200) {
System.out.println(response.body().string());
}
});

注：在okhttp2中 如果想设置超时时间直接通过OkHttpClient 对象来设置

okHttpClient .setConnectTimeout(10, TimeUnit.SECONDS);
okHttpClient .setWriteTimeout(10, TimeUnit.SECONDS);
okHttpClient .setReadTimeout(20, TimeUnit.SECONDS);

但okhttp3OkHttpClient 对象没有这个方法，需要借助new OkHttpClient.Builder()按照上面的方法设置超时时间。

2.okhttp POST方式请求（提交表单方式）

OkHttpClient okHttpClient  = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10,TimeUnit.SECONDS)
.readTimeout(20, TimeUnit.SECONDS)
.build();

//post方式提交的数据
FormBody formBody = new FormBody.Builder()
.add("name", "android基础")
.add("price", "50")
.build();

final Request request = new Request.Builder()
.url("http://172.20.192.168:8080/getbookByFrom")//请求的url
.post(formBody)
.build();

//创建/Call
Call call = okHttpClient.newCall(request);
//加入队列 异步操作
call.enqueue(new Callback() {
//请求错误回调方法
@Override
public void onFailure(Call call, IOException e) {
System.out.println("连接失败");
}

@Override
public
4000
void onResponse(Call call, Response response) throws IOException {
if(response.code()==200) {
System.out.println(response.body().string());
}
}
});

3.okhttp POST方式请求（提交json方式）

OkHttpClient okHttpClient  = new OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10,TimeUnit.SECONDS)
.readTimeout(20, TimeUnit.SECONDS)
.build();

Book book = new Book();
book.setName("android基础");
book.setPrice(59);
//使用Gson 添加 依赖 compile 'com.google.code.gson:gson:2.8.1'
Gson gson = new Gson();
//使用Gson将对象转换为json字符串
String json = gson.toJson(book);

//MediaType  设置Content-Type 标头中包含的媒体类型值
RequestBody requestBody = FormBody.create(MediaType.parse("application/json; charset=utf-8")
, json);

Request request = new Request.Builder()
.url("http://172.20.192.168:8080/getbookByJson")//请求的url
.post(requestBody)
.build();

//创建/Call
Call call = okHttpClient.newCall(request);
//加入队列 异步操作
call.enqueue(new Callback() {
//请求错误回调方法
@Override
public void onFailure(Call call, IOException e) {
System.out.println("连接失败");
}
@Override
public void onResponse(Call call, Response response) throws IOException {
System.out.println(response.body().string());
}
});