Okhttp之FormBody

FormBody繼承抽象類RequestBody

它的CONTENT_TYPE是一個靜態常量

 private static final MediaType CONTENT_TYPE = MediaType.get("application/x-www-form-urlencoded");

裏面還有一個內部類Builder

 public static final class Builder {
    private final List<String> names = new ArrayList<>();
    private final List<String> values = new ArrayList<>();
    private final Charset charset;

    public Builder() {
      this(null);
    }

    public Builder(Charset charset) {
      this.charset = charset;
    }

    public Builder add(String name, String value) {
      if (name == null) throw new NullPointerException("name == null");
      if (value == null) throw new NullPointerException("value == null");

      names.add(HttpUrl.canonicalize(name, FORM_ENCODE_SET, false, false, true, true, charset));
      values.add(HttpUrl.canonicalize(value, FORM_ENCODE_SET, false, false, true, true, charset));
      return this;
    }

    public Builder addEncoded(String name, String value) {
      if (name == null) throw new NullPointerException("name == null");
      if (value == null) throw new NullPointerException("value == null");

      names.add(HttpUrl.canonicalize(name, FORM_ENCODE_SET, true, false, true, true, charset));
      values.add(HttpUrl.canonicalize(value, FORM_ENCODE_SET, true, false, true, true, charset));
      return this;
    }

    public FormBody build() {
      return new FormBody(names, values);
    }
  }

所以可以這樣使用：

public void doPost(String url, Map<String, String> params, Callback callback) {

        FormBody.Builder builder = new FormBody.Builder();
        //遍歷集合,,,map集合遍歷方式
        for (String key : params.keySet()) {
            builder.add(key, params.get(key));
        }

        //創建Request....formBody...new formBody.Builder()...add()....build()
        Request request = new Request.Builder().url(url).post(builder.build()).build();

        Call call = okHttpClient.newCall(request);
        call.enqueue(callback);
    }