最近开发一个自己玩的小东西，发现android 9 不支持http了，把org.apache.http.legacy.jar移除了，只支持https，很烦人。

有以下三种解决方案

1、APP改用https请求，网站也需要支持ssl

2、targetSdkVersion 降到27以下

3、使用OKHTTP库

这里说说第三种办法：

OKHTTP官网：

https://square.github.io/okhttp/

https://github.com/square/okhttp/

需要2个jar包：

下载链接：

https://download.csdn.net/download/x1131230123/11820098

android stdoi新建空工程后，添加到libs

添加依赖jar

访问百度http

MainActivity.java

package com.example.myapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import java.io.IOException;
import okhttp3.Call;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Thread thread = new Thread() {
            @Override
            public void run() {
                OkHttpClient client = new OkHttpClient();
                Request request = new Request.Builder()
                        .get()
                        .url("http://www.baidu.com")
                        .build();
                Call call = client.newCall(request);
                try {
                    Response response = call.execute();
                    Log.i("http-", response.toString());
                    assert response.body() != null;
                    String body = response.body().string();
                    Log.i("http-", body);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };
        thread.start();
    }
}

添加网络权限，并给一个android

manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:networkSecurityConfig="@xml/network_security_config"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <meta-data
            android:name="com.google.android.actions"
            android:resource="@xml/network_security_config" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

res里新建action xml，然后建立

network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
    <base-config cleartextTrafficPermitted="true" />
</network-security-config>