János János - 2 months ago 16
Android Question

How to pass body to OKHttp message?

I have found this example below to send HTTP POST message with

OKHttp
.

I do not understand how to pass a body string to
RequestBody
. Why it takes two argument?

RequestBody formBody = new FormBody.Builder()
.add("message", "Your message")
.build();
Request request = new Request.Builder()
.url("http://rhcloud.com")
.post(formBody).addHeader("operation", "modifyRecords")
.build();

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {

client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}

@Override
public void onResponse(Call call, Response response) throws IOException {
try (ResponseBody responseBody = response.body()) {
if (!response.isSuccessful())
throw new IOException("Unexpected code " + response);

Headers responseHeaders = response.headers();
for (int i = 0, size = responseHeaders.size(); i < size; i++) {
System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
}

System.out.println(responseBody.string());
}
}
});
}
}

Answer

I'm not sure if I understand what you mean quite right, but if you are asking why the FormBody .add() takes to arguments, it's because these are Key-Value-Pairs. The first parameter is the name and the second the value.

Anyway I think this example shows a clearer way how to post a string:

  public static final MediaType MEDIA_TYPE_MARKDOWN
      = MediaType.parse("text/x-markdown; charset=utf-8");

  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    String postBody = ""
        + "Releases\n"
        + "--------\n"
        + "\n"
        + " * _1.0_ May 6, 2013\n"
        + " * _1.1_ June 15, 2013\n"
        + " * _1.2_ August 11, 2013\n";

    Request request = new Request.Builder()
        .url("https://api.github.com/markdown/raw")
        .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody))
        .build();

    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

    System.out.println(response.body().string());
  }
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