我在 android studio 中编码，我需要使用 Http url 连接而不是 httpclient。 我如何转换我的代码？

Question

我需要帮助将我的代码从 http 客户端传输到 http URL 连接，因为 android studio 不支持 Http 客户端并且它一直给我一个错误。 我正在使用 bing faces api，这个 api 有一些特殊的格式需要完成，比如发送标题或正文，我不知道 Http url 连接是否支持。

    package com.example.test.bingfacessimilar;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        HttpClient httpclient = HttpClients.createDefault();

        try {
            URL url = new URL("https://api.projectoxford.ai/face/v1.0/detect");
            HttpURLConnection connection = (HttpURLConnection)url.openConnection();
            connection.setRequestProperty("Content-Type", "application/json");
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");


            URIBuilder builder = new URIBuilder("https://api.projectoxford.ai/face/v1.0/detect");

            builder.setParameter("returnFaceId", "true");
            builder.setParameter("returnFaceLandmarks", "true");
            builder.setParameter("returnFaceAttributes", "{string}");

            URI uri = builder.build();
            HttpPost request = new HttpPost(uri);
            request.setHeader("Content-Type", "application/json");
            request.setHeader("Ocp-Apim-Subscription-Key", "77c634fea67944ad861e73ef737bba4b\n");


            // Request body
            StringEntity reqEntity = new StringEntity("{\n" + "\"url\":\"http://tamildownloads.p4o.net/wp-content/uploads/2014/06/rajinipic.jpg?ckattempt=1\"\n" + "}");
            request.setEntity(reqEntity);

            HttpResponse response = httpclient.execute(request);
            HttpEntity entity = response.getEntity();

            if (entity != null) {
                System.out.println(EntityUtils.toString(entity));
            }
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

没有简单的方法可以从 httpclient 切换到 http urlconnection。 你将不得不重写你的代码。 如需参考，请参阅文档http://developer.android.com/reference/java/net/HttpURLConnection.html

但是，如果您仍想使用 httpclient，请执行以下操作。

在 build.gradle 文件中添加 useLibrary 'org.apache.http.legacy'，如下所示-

android {
useLibrary 'org.apache.http.legacy'
}

如果这不起作用，请执行以下操作

– 将Android SDK 目录的/platforms/android-23/optional 路径中的org.apache.http.legacy.jar 复制到项目的app/libs 文件夹中。

– 现在在 build.gradle 文件的 dependencies{} 部分中添加编译文件（'libs/org.apache.http.legacy.jar'）。