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OKHTTP3 简单使用(三) POST方法

无论是GET还是POST请求，最后都是有Call发起的，所以POST也可以有同步和异步两种方式，请求时步骤与GET基本一致

与GET不同的是，在构建Request的时候，需要传一个RequestBody对象，RequestBody用来添加请求参数以及制定MideaType(Content-Type)

POST请求-普通参数请求

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OkHttpClient client = new OkHttpClient();
FormBody.Builder formBodyBuilder = new FormBody.Builder();
formBodyBuilder.add("Param name1", "Param value1");
formBodyBuilder.add("Param name2", "Param value2");
Request request = new Request.Builder()
     .url(url)
     .post(formBodyBuilder.build())
     .build();
Call call = client.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 result = response.body().string();
    }
});

与GET对比，POST请求多了一个FormBody，构建Request的时候多了一个post()
使其GET请求构建Request的时候是有一个get()的

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Request request = new Request.Builder()
    .url(url)
    .get()
    .build();

只不过请求时默认就是GET请求，因此可以省略不写
POST请求的时候需要传递一个RequestBody，FormBody继承自RequestBody

POST请求-提交Json String

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OkHttpClient client = new OkHttpClient();
MediaType mediaType = MediaType.parse("application/json; charset=utf-8")
RequestBody requestBody = FormBody.create(mediaType, jsonString);
Request request = new Request.Builder()
     .url(url)
     .post(requestBody)
     .build();
Call call = client.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 result = response.body().string();
    }
});

与普通参数请求对比，Json String的提交多了一个MediaType，普通参数请求的时候MediaType为

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MediaType mediaType = MediaType.parse("application/x-www-form-urlencoded; charset=utf-8")

FormBody默认的MediaType就是application/x-www-form-urlencoded; charset=utf-8因此也可以省略不写

POST请求-以流方式请求

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OkHttpClient client = new OkHttpClient();
RequestBody requestBody = new RequestBody() {
    @Override public MediaType contentType() {
        return MediaType.parse("text/x-markdown; charset=utf-8");
    }
 
    @Override public void writeTo(BufferedSink sink) throws IOException {
        sink.writeUtf8("Users\n");
        for (int i = 1; i < 100; i++) {
            sink.writeUtf8(String.format("Name%d\n", i));
        }
    }
};
Request request = new Request.Builder()
     .url(url)
     .post(requestBody)
     .build();
Call call = client.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 result = response.body().string();
    }
});

RequestBody的内容通过流的方式写入，然后将流写进Okio的BufferedSink中进行提交
如果需要使用OutputStream可以通过BufferedSink.outputStream()进行获取

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