Question

我之前跟着这个article来构建我自己的RESTful API服务器。现在，我想向android studio中的API服务器发送POST请求。我遵循了reply，但没有成功。

以下是我的代码的一部分：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_events_create);

    ActionBar actionBar = this.getSupportActionBar();
    actionBar.setTitle("Test");
    actionBar.setDisplayHomeAsUpEnabled(true);


    URL url;
    HttpURLConnection connection = null;
    try {
        url = new URL("http://myip/task_manager/v1/register");
        connection = (HttpURLConnection)url.openConnection();
        connection.setDoOutput(true);
        connection.setRequestMethod("POST"); // hear you are telling that it is a POST request, which can be changed into "PUT", "GET", "DELETE" etc.
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // here you are setting the `Content-Type` for the data you are sending which is `application/json`
        connection.connect();

        //Send request
        DataOutputStream wr = new DataOutputStream(
                connection.getOutputStream ());
        wr.writeBytes("Parameter String"); // I dunno how to write this string..
        wr.flush();
        wr.close ();

        InputStream is;
        int response = connection.getResponseCode();
        if (response >= 200 && response <=399){
            //return is = connection.getInputStream();
            //return true;
        } else {
            //return is = connection.getErrorStream();
            //return false;
        }


    } catch (Exception e) {

        e.printStackTrace();
        //return false;

    } finally {

        if(connection != null) {
            connection.disconnect();
        }
    }

}

这是我的问题：
1.当＆＃34; connection.connect（）;＆＃34;运行，控制台出错。我的网址字符串是错误的吗？ 2.＆＃34;参数字符串＆＃34;像？（我的参数是email = xxx，name = yyy）
3.有没有更好的方法来发送POST请求？

非常感谢!!!!!!〜

Answer 1

回答你的问题＃3会建议使用像OkHTTP这样的库来发出帖子请求。这将使您的代码更简单，更容易调试。

确保您在Manifest上拥有以下权限：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

将库添加到gradle文件中：

compile 'com.squareup.okhttp3:okhttp:3.10.0'

然后，将您的onCreate方法更改为以下内容：

private final OkHttpClient client = new OkHttpClient();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_events_create);

    ActionBar actionBar = this.getSupportActionBar();
    actionBar.setTitle("Test");
    actionBar.setDisplayHomeAsUpEnabled(true);

    makePost();
}

private void makePost(){
    RequestBody requestBody = new MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("email", "your-email@email.com")
        .addFormDataPart("name", "your-name")
        .build();

    request = new Request.Builder()
        .url("http://myip/task_manager/v1/register")
        .post(requestBody)
        .build();

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

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

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

这应该向您的终端发出一个帖子请求。

如果您想记录它，您只需添加logging interceptor即可。

希望这会帮助你！

Answer 2

请在android中使用针对api调用的volley或retrofit依赖项，因为它易于使用

排球教程： https://www.androidtutorialpoint.com/networking/android-volley-tutorial/

改装教程： https://www.androidhive.info/2016/05/android-working-with-retrofit-http-library/

请参考这两个

在android studio中发送POST请求

2 个答案: