OKHTTP3的简单使用，表单提交，json传递

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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 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());            }        });

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