Android使用NanoHttpd在app内搭建http server(一)

一、场景：

想没想过在自己的Android的 app里内嵌一个http server服务端，这样咱们就可以从PC和手机上的浏览器遥控app了。接下来就使用一个GitHub的开源库Nanohttpd在app内搭建一个小型http的server。开源库地址：GitHub - NanoHttpd/nanohttpd: Tiny, easily embeddable HTTP server in Java.

二、简单集成使用

引入依赖库：implementation 'org.nanohttpd:nanohttpd:2.3.1'

写一个类继承依赖库的NanoHTTPD.java，具体对外提供资源访问的代码在重写的serve方法中，

/*** Date: 2022/4/19* Author: SunBinKang* Description: 传入主机IP和自定义的端口号，这里的主机明要为安装app的那台设备的网络IP地址*/
class HttpServerV1(hostname: String?, port: Int) : NanoHTTPD(hostname, port) {//继承NanoHTTPDprivate val TAG = "binkang"private var count = 0 //用于记录请求为第几次private var mGson: Gson = Gson() //用于记录请求为第几次override fun serve(session: IHTTPSession?): Response {return dealWith(session)}private fun dealWith(session: IHTTPSession?): Response {//日志输出外部请求相关的日志信息Log.i(TAG,"dealWith: session.uri = ${session?.uri}, method = ${session?.method}, header = ${session?.headers}, " +"params = ${session?.parameters}")//响应get请求if (Method.GET == session?.method) {if (session.uri == HTTP_URI_SAYSOMETHING) {count++val param = session.parametersreturn responseJsonString(200,"${param["name"]?.get(0)}, say somthing to me $count, ok?","请求成功！")}} else if (Method.POST == session?.method) {//响应post请求//获取请求头数据val header = session.headers//获取传参参数val param = session.parametersreturn when (session.uri) {HTTP_URI_SUM -> {var b: Int = param["number"]?.get(0).toString().toInt()for (i in 0..100) {b += 1}responseJsonString(200, b, "Success！")}HTTP_URI_HELLO -> responseJsonString(200,"Hello ${param["name"]?.get(0)} !","Success！")else -> responseJsonString(404, "It's nothing!", "Success！")}}return responseJsonString(404, "", "Request not support!")}private fun <T : Any> responseJsonString(code: Int, data: T, msg: String): Response {val response = Responser<T>(code, data, msg)Log.i(TAG, "responseJsonString: $response")return newFixedLengthResponse(mGson.toJson(response))//返回对应的响应体Response}
}

再新建一个配置常量类：Config.kt

const val HTTP_IP = "10.153.205.27"//这是我当前手机流量下的IP地址
const val HTTP_PORT = 8080
const val HTTP_URL = "http://${HTTP_IP}:${HTTP_PORT}/"/*** POST请求:* @param number (integer 数字）* {*   "code":200,*   "data":106,*   "msg":"请求成功！"* }*/
const val HTTP_URI_SUM = "/api/sumHundredTime"/*** POST请求:* @param name (String 数字）* {*   "code":200,*   "data":"Hello 叫啥来着 !",*   "msg":"请求成功！"* }*/
const val HTTP_URI_HELLO = "/api/holleMan"/*** GET请求：* @param name (String 数字）* {*   "code":200,*   "data":"哈哈哈哈, say somthing to me 1, ok?",*   "msg":"请求成功！"* }*/
const val HTTP_URI_SAYSOMETHING = "/api/saySomething"

上面的IP是我手机流量下的IP地址：如果是连了WiFi的写上WiFi的IP地址也行，端口port自定义就行。

Responser.kt类

class Responser<T>(val code: Int, val data: T, val msg: String) {
}

然后就是在AndroidManifest.xml加上网络权限

<uses-permission android:name="android.permission.INTERNET" />

最后就是我们在mainActivity.java中启动这个server了：

class MainActivity : AppCompatActivity() {var mHttpServer: HttpServerV1? = nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)mHttpServer = HttpServerV1(HTTP_IP, HTTP_PORT)//三种启动方式都行
//        mHttpServer.start()
//        mHttpServer.start(NanoHTTPD.SOCKET_READ_TIMEOUT)mHttpServer?.start(NanoHTTPD.SOCKET_READ_TIMEOUT, false)}override fun onDestroy() {super.onDestroy()mHttpServer?.stop()//停止}
}

以上就完成了。说明一下我的build.gradle环境

plugins {id 'com.android.application'id 'kotlin-android'
}android {compileSdkVersion 30buildToolsVersion "30.0.2"defaultConfig {applicationId "com.example.nanohttpd"minSdkVersion 19targetSdkVersion 30versionCode 1versionName "1.0"testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'}}compileOptions {sourceCompatibility JavaVersion.VERSION_1_8targetCompatibility JavaVersion.VERSION_1_8}kotlinOptions {jvmTarget = '1.8'}
}dependencies {implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"implementation 'com.android.support:appcompat-v7:28.0.0'implementation 'androidx.constraintlayout:constraintlayout:2.1.3'testImplementation 'junit:junit:4.+'androidTestImplementation 'com.android.support.test:runner:1.0.2'androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'implementation 'org.nanohttpd:nanohttpd:2.3.1'implementation 'com.google.code.gson:gson:2.8.6'
}

运行试试，手机浏览器访问成功：

电脑postman访问get请求：

这样在android中，一个简单的http server就搭建好了。

后续会上传项目到GitHub上。代码地址在下一篇的文章最后面~。