package com.example.myhttp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import com.example.myhttp.Util.LogUtil;

import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button http = findViewById(R.id.http);
        http.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            URL url = new URL("http://localhost:9102/get/text");
                            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                            connection.setConnectTimeout(10000);//连接时间
                            connection.setRequestMethod("GET");//请求方法
                            connection.setRequestProperty("Accept-Language","zh-CN,zh;q=0.9");
                            connection.setRequestProperty("Accept","*/*");
                            connection.connect();
                            //结果码
                            int resultcode = connection.getResponseCode();
                            if (resultcode == 200) {
                                Map<String, List<String>> entries = connection.getHeaderFields();
                                for (Map.Entry<String, List<String>> entry : entries.entrySet()) {
                                    LogUtil.d(TAG,entry.getKey() +"=="+entry.getValue()) ;
                                }
                                Object object = connection.getContent();
                                LogUtil.d(TAG,""+object);

                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        });
    }


}

--------------------------------------------------------------------------------------------------------------------------------上面这是我的代码。

01-30 16:23:04.137 21310-21310/? I/art: Late-enabling -Xcheck:jni

01-30 16:23:04.177 21310-21310/? D/Environment: 111 rawUserId = 0

01-30 16:23:04.177 21310-21310/? D/AndroidKeyStoreProvider: not overseas product

01-30 16:23:04.417 21310-21310/com.example.myhttp W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter androidx.vectordrawable.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable

01-30 16:23:04.437 21310-21310/com.example.myhttp D/STATUSBAR_DEBUG: vivo statusbar style

01-30 16:23:04.437 21310-21310/com.example.myhttp D/STATUSBAR_DEBUG: windowDrawsFlag set

01-30 16:23:04.437 21310-21310/com.example.myhttp D/STATUSBAR_DEBUG: IconColor=1

01-30 16:23:04.437 21310-21310/com.example.myhttp D/STATUSBAR_DEBUG: StatusBarColor final set ff00574b

01-30 16:23:04.497 21310-21310/com.example.myhttp I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>

01-30 16:23:04.497 21310-21310/com.example.myhttp I/art: Rejecting re-init on previously-failed class java.lang.Class<androidx.core.view.ViewCompat$OnUnhandledKeyEventListenerWrapper>

01-30 16:23:04.627 21310-21338/com.example.myhttp D/OpenGLRenderer: Render dirty regions requested: true

01-30 16:23:04.637 21310-21310/com.example.myhttp D/Atlas: Validating map...

01-30 16:23:04.677 21310-21338/com.example.myhttp I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BR.1.2.1.C1.05.00.02.085.142_msm8916_32_refs/tags/AU_LINUX_ANDROID_LA.BR.1.2.1.C1.05.00.02.085.142__release_AU (I1d82aa3ca9)

   OpenGL ES Shader Compiler Version: E031.25.03.04

   Build Date: 01/04/16 Mon

   Local Branch:

   Remote Branch: refs/tags/AU_LINUX_ANDROID_LA.BR.1.2.1.C1.05.00.02.085.142

   Local Patches: NONE

   Reconstruct Branch: NOTHING

01-30 16:23:04.677 21310-21338/com.example.myhttp I/OpenGLRenderer: Initialized EGL, version 1.4

01-30 16:23:04.697 21310-21338/com.example.myhttp D/OpenGLRenderer: Enabling debug mode 0

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err: java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 9102) after 10000ms: isConnected failed: ECONNREFUSED (Connection refused)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at libcore.io.IoBridge.isConnected(IoBridge.java:238)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at libcore.io.IoBridge.connectErrno(IoBridge.java:171)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at libcore.io.IoBridge.connect(IoBridge.java:122)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at java.net.Socket.connect(Socket.java:882)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.internal.Platform.connectSocket(Platform.java:139)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.Connection.connect(Connection.java:148)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at com.example.myhttp.MainActivity$1$1.run(MainActivity.java:39)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at java.lang.Thread.run(Thread.java:818)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err: Caused by: android.system.ErrnoException: isConnected failed: ECONNREFUSED (Connection refused)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err:    at libcore.io.IoBridge.isConnected(IoBridge.java:223)

01-30 16:23:17.097 21310-21405/com.example.myhttp W/System.err: ... 13 more

----------------------------------------------------------------------------------------------------------------报错

大概好像是因为拒绝访问，百度上没有解决到这个问题。这个是因为端口问题嘛