另一种方法是如果你有httpclient。jar文件你就可以 这样的:

将.jar文件粘贴到项目的“libs文件夹”中。然后在gradle中添加这一行到build.gradle(模块:app)

dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
compile 'com.android.support:appcompat-v7:23.0.0'
compile files('libs/httpcore-4.3.3.jar')
}

HttpClient在API Level 22中已弃用，并在API Level 23中被移除。如果你必须，你仍然可以在API级别23及以上使用它，但是最好转移到受支持的方法来处理HTTP。所以，如果你用23编译，在build.gradle中添加这个:

android {
    useLibrary("org.apache.http.legacy")
}

在sdk 23中不再支持HttpClient。Android 6.0 (API Level 23)版本删除了对Apache HTTP客户端的支持。 你必须使用

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

并在您的依赖项中添加以下代码片段:

//http web服务的最终解决方案(包括文件上传)

compile('org.apache.httpcomponents:httpmime:4.3.6') {
        exclude module: 'httpclient'
}
 compile 'org.apache.httpcomponents:httpclient-android:4.3.5'

它也将帮助你，当你使用使用多亲子文件上传。

如前所述，org.apache.http.client.HttpClient在以下版本中不再被支持:

SDK (API级别)#23。

你必须使用java。net。httpurlconnection。

如果你想让你的代码(和生活)在使用HttpURLConnection时更容易，这里是这个类的包装器，它可以让你使用JSON对GET、POST和PUT进行简单的操作，例如，执行HTTP PUT。

HttpRequest request = new HttpRequest(API_URL + PATH).addHeader("Content-Type", "application/json");
int httpCode = request.put(new JSONObject().toString());
if (HttpURLConnection.HTTP_OK == httpCode) {
    response = request.getJSONObjectResponse();
} else {
  // log error
}
httpRequest.close()

请随意使用。

package com.calculistik.repository;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * <p>
 * Copyright © 2017, Calculistik . All rights reserved.
 * <p>
 * Oracle and Java are registered trademarks of Oracle and/or its
 * affiliates. Other names may be trademarks of their respective owners.
 * <p>
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * https://netbeans.org/cddl-gplv2.html or
 * nbbuild/licenses/CDDL-GPL-2-CP. See the License for the specific
 * language governing permissions and limitations under the License.
 * When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP. Oracle designates this particular file
 * as subject to the "Classpath" exception as provided by Oracle in the
 * GPL Version 2 section of the License file that accompanied this code. If
 * applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 * <p>
 * Contributor(s):
 * Created by alejandro tkachuk @aletkachuk
 * www.calculistik.com
 */
public class HttpRequest {

    public static enum Method {
        POST, PUT, DELETE, GET;
    }

    private URL url;
    private HttpURLConnection connection;
    private OutputStream outputStream;
    private HashMap<String, String> params = new HashMap<String, String>();

    public HttpRequest(String url) throws IOException {
        this.url = new URL(url);
        connection = (HttpURLConnection) this.url.openConnection();
    }

    public int get() throws IOException {
        return this.send();
    }

    public int post(String data) throws IOException {
        connection.setDoInput(true);
        connection.setRequestMethod(Method.POST.toString());
        connection.setDoOutput(true);
        outputStream = connection.getOutputStream();
        this.sendData(data);
        return this.send();
    }

    public int post() throws IOException {
        connection.setDoInput(true);
        connection.setRequestMethod(Method.POST.toString());
        connection.setDoOutput(true);
        outputStream = connection.getOutputStream();
        return this.send();
    }

    public int put(String data) throws IOException {
        connection.setDoInput(true);
        connection.setRequestMethod(Method.PUT.toString());
        connection.setDoOutput(true);
        outputStream = connection.getOutputStream();
        this.sendData(data);
        return this.send();
    }

    public int put() throws IOException {
        connection.setDoInput(true);
        connection.setRequestMethod(Method.PUT.toString());
        connection.setDoOutput(true);
        outputStream = connection.getOutputStream();
        return this.send();
    }

    public HttpRequest addHeader(String key, String value) {
        connection.setRequestProperty(key, value);
        return this;
    }

    public HttpRequest addParameter(String key, String value) {
        this.params.put(key, value);
        return this;
    }

    public JSONObject getJSONObjectResponse() throws JSONException, IOException {
        return new JSONObject(getStringResponse());
    }

    public JSONArray getJSONArrayResponse() throws JSONException, IOException {
        return new JSONArray(getStringResponse());
    }

    public String getStringResponse() throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        StringBuilder response = new StringBuilder();
        for (String line; (line = br.readLine()) != null; ) response.append(line + "\n");
        return response.toString();
    }

    public byte[] getBytesResponse() throws IOException {
        byte[] buffer = new byte[8192];
        InputStream is = connection.getInputStream();
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        for (int bytesRead; (bytesRead = is.read(buffer)) >= 0; )
            output.write(buffer, 0, bytesRead);
        return output.toByteArray();
    }

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

    private int send() throws IOException {
        int httpStatusCode = HttpURLConnection.HTTP_BAD_REQUEST;

        if (!this.params.isEmpty()) {
            this.sendData();
        }
        httpStatusCode = connection.getResponseCode();

        return httpStatusCode;
    }

    private void sendData() throws IOException {
        StringBuilder result = new StringBuilder();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            result.append((result.length() > 0 ? "&" : "") + entry.getKey() + "=" + entry.getValue());//appends: key=value (for first param) OR &key=value(second and more)
        }
        sendData(result.toString());
    }

    private HttpRequest sendData(String query) throws IOException {
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
        writer.write(query);
        writer.close();
        return this;
    }

}

ApacheHttp Client在v23 sdk中被移除。您可以使用HttpURLConnection或第三方Http客户端，如OkHttp。

参考:https://developer.android.com/preview/behavior-changes.html#behavior-apache-http-client

你只需要加一行

useLibrary 'org.apache.http.legacy'

为构建。例如gradle(Module: app)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "25.0.0"

    useLibrary 'org.apache.http.legacy'

    defaultConfig {
        applicationId "com.avenues.lib.testotpappnew"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    testCompile 'junit:junit:4.12'
}