HttpClient 不会在 Android Studio 中导入

HttpClient won't import in Android Studio

我在 Android Studio 中编写了一个简单的 class:

package com.mysite.myapp;

import org.apache.http.client.HttpClient;

public class Whatever {
    public void headBangingAgainstTheWallExample () {
        HttpClient client = new DefaultHttpClient();
    }
}

由此我得到以下编译时错误:

Cannot resolve symbol HttpClient

HttpClient 是否包含在 Android Studio SDK 中?即使不是,我也将它添加到我的 Gradle 构建中,如下所示:

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile 'org.apache.httpcomponents:httpclient:4.5'
}

不管有没有最后的编译行,错误都是一样的。我错过了什么?

sdk 23 不再支持

HttpClient。您必须使用 URLConnection 或降级到 sdk 22 (compile 'com.android.support:appcompat-v7:22.2.0')

如果您需要 sdk 23,请将其添加到您的 gradle:

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

您也可以尝试下载并包含 HttpClient jar directly into your project or use OkHttp 而不是

您的项目中有哪个 API 目标?AndroidHttpClient 仅适用于 API 级别 8 <。 请查看 here

享受你的代码:)

ApacheHttp 客户端在 v23 sdk 中被移除。您可以使用 HttpURLConnection 或像 OkHttp 这样的第三方 Http 客户端。

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

HttpClient 在 API 级别 22 中被弃用并在 API 级别 23 中删除。如果必须,您仍然可以在 API 级别 23 及以后的版本中使用它,但是最好移动到支持的方法来处理 HTTP。因此,如果您使用 23 进行编译,请将其添加到您的 build.gradle:

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

1- 下载 Apache jar 文件(截至本回答)4.5.zip 文件来自:
https://hc.apache.org/downloads.cgi?Preferred=http%3A%2F%2Fapache.arvixe.com%2F

2- 打开 zip 将 jar 文件复制到您的 libs 文件夹中。如果您转到项目顶部显示 "Android" 的位置,您可以找到它,单击它时您会找到一个列表。所以,

Android -> Project -> app -> libs

,然后把罐子放在那里。

3-在build.gradle(模块:app)中添加

compile fileTree(dir: 'libs', include: ['*.jar'])

 dependency { 
   }

4- 在 java class 添加这些导入:

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.params.CoreProtocolPNames;

要为 SDK 级别 23 使用 Apache HTTP:

顶层build.gradle - /build.gradle

buildscript {
    ...
    dependencies {
        classpath 'com.android.tools.build:gradle:1.5.0' 
        // Lowest version for useLibrary is 1.3.0
        // Android Studio will notify you about the latest stable version
        // See all versions: http://jcenter.bintray.com/com/android/tools/build/gradle/
    }
    ...
}

来自 Android 工作室的关于 gradle 更新的通知:

模块特定 build.gradle - /app/build.gradle

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"
    ...
    useLibrary 'org.apache.http.legacy'
    ...
}

在 API 22 中,它们已被弃用,在 API 23 中,它们被完全删除,如果你不需要新添加的所有花哨的东西,一个简单的解决方法是简单地使用来自 apache 的 .jar 文件在 API 22 之前集成,但作为单独的 .jar 文件:

1. http://hc.apache.org/downloads.cgi
2. download httpclient 4.5.1, the zile file
3. unzip all files
4. drag in your project httpclient-4.5.1.jar, httpcore-4.4.3.jar and httpmime-4.5.1.jar
5. project, right click, open module settings, app, dependencies, +, File dependency and add the 3 files
6. now everything should compile properly

您可以简单地将其添加到 Gradle 依赖项中:

compile "org.apache.httpcomponents:httpcore:4.3.2"

TejaDroid 在下面的回答 link 帮助了我。

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.0.1'

    compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
    ...
}

Another way is if you have httpclient.jar file then you can do this :

将您的 .jar 文件粘贴到项目的 "libs folder" 中。然后在 gradle 中将此行添加到您的 build.gradle(Module: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')
}

试试这个 为我工作 将此依赖项添加到您的 build.gradle 文件

compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'

Android 6.0(API 级别 23)版本删除了对 Apache HTTP 客户端的支持。因此你不能直接在API23中使用这个库。但是有一种方法可以使用它。在您的 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,您可以应用以下 hack-

– 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{} 部分添加编译文件(‘libs/org.apache.http.legacy.jar’)。

只需使用这个:-

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

sdk 23 不再支持 HttpClient。Android 6.0(API 级别 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:

//web-service的http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'

它也会在您使用 MultipartEntity 进行 文件上传.

时帮助您

我认为根据您拥有的 Android Studio 版本,更新您的 android 工作室也很重要,我听从了大家的建议也变得很沮丧,但没有运气,直到我不得不将我的 android 版本从 1.3 升级到 1.5,错误像魔法一样消失了。

SDK 23 和 23+ 不支持 HttpClient。

如果您需要使用 sdk 23,请将以下代码添加到您的 gradle:

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

它对我有用。希望对你有用。

如果您需要 sdk 23,请将其添加到您的 gradle:

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

在dependencies下添加这两行

compile 'org.apache.httpcomponents:httpcore:4.4.1'
compile 'org.apache.httpcomponents:httpclient:4.5'

然后

useLibrary 'org.apache.http.legacy'

下android

您只需添加一行

useLibrary 'org.apache.http.legacy'

变成build.gradle(模块:app),例如

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'
}

如前所述,org.apache.http.client.HttpClient 不再受支持:

SDK(API 级别)#23。

你必须使用 java.net.HttpURLConnection.

如果您想在使用 HttpURLConnection 时简化您的代码(和生活),这里有一个 class 的 Wrapper 可以让您使用 GETPOSTPUT 使用 JSON,例如 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()

欢迎使用。

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;
    }

}

错误:(30, 0) Gradle 未找到 DSL 方法:'classpath()' 可能的原因:

  • 项目 'cid' 可能正在使用不包含该方法的 Android Gradle 插件版本(例如添加了 'testCompile'在 1.1.0 中)。 将插件升级到版本 2.3.3 并同步项目
  • 项目'cid' 可能正在使用不包含该方法的Gradle 版本。 打开 Gradle 包装文件
  • 构建文件可能缺少 Gradle 插件。 应用 Gradle 插件
  • 如果你想导入一些 class 比如:

    import org.apache.http.NameValuePair;
    import org.apache.http.client.HttpClient; 
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.params.BasicHttpParams;
    import org.apache.http.params.HttpConnectionParams;
    import org.apache.http.params.HttpParams;
    

    您可以在 build.gradle(Gradle 依赖项)中添加以下行

    dependencies {
        implementation fileTree(dir: 'libs', include: ['*.jar'])
        implementation 'com.android.support:appcompat-v7:27.1.0'
        implementation 'com.android.support:support-v4:27.1.0'
    
        .
        .
        .
    
        implementation 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
    
    }
    

    对于 android API 28 岁及以上 在 Manifest.xml 应用程序标签内

        <application
        .
        .
        .
    
        <uses-library android:name="org.apache.http.legacy" android:required="false"/>
    

    自 2021 年 4 月起,您可以使用以下内容:

    在您的应用 gradle 中,在 'dependencies { ' 下添加以下内容:

    implementation 'org.apache.httpcomponents:httpcore:4.4.10'
    implementation 'org.apache.httpcomponents:httpclient:4.5.6'
    

    在您的 Java activity 中,添加以下导入:

    import org.apache.http.client.HttpClient;
    

    然后您应该能够将 HttpClient 添加到您的方法中。