from 數據如下

			
key=value&other=data			
			
			

			
		String url = "https://api.netkiller.cn/oauth/token";

		OkHttpClient client = new OkHttpClient();

        RequestBody formBody = new FormBody.Builder()
                .add("grant_type", "password")
                .add("username", "netkiller")
                .add("password", "123456")
                .build();

        Request request = new Request.Builder()
                .url(url)
                .post(formBody)
                .build();

        Response response = client.newCall(request).execute();
        if (!response.isSuccessful()) {
            throw new IOException("伺服器端錯誤: " + response);
        }
			
			

POST RAW Json 數據，數據的形態這樣的

			
{"key":"value"}
			
			

			
public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

String post(String url, String json) throws IOException {
  RequestBody body = RequestBody.create(JSON, json);
  Request request = new Request.Builder()
      .url(url)
      .post(body)
      .build();
  Response response = client.newCall(request).execute();
  return response.body().string();
}		
			
			

			
OkHttpClient client = new OkHttpClient();
final MediaType MEDIA_TYPE_TEXT = MediaType.parse("text/plain");
final String postBody = "Hello World";

RequestBody requestBody = new RequestBody() {
    @Override
    public MediaType contentType() {
        return MEDIA_TYPE_TEXT;
    }
    @Override
    public void writeTo(BufferedSink sink) throws IOException {
        sink.writeUtf8(postBody);
    }
    @Override
    public long contentLength() throws IOException {
        return postBody.length();
    }
};

Request request = new Request.Builder()
        .url("https://www.google.com")
        .post(requestBody)
        .build();
Response response = client.newCall(request).execute();
if (!response.isSuccessful()) {
    throw new IOException("伺服器端錯誤: " + response);
}
System.out.println(response.body().string());