Android 本地客户端搭建小型服务器

Android 搭建Http服务器，接收各端的 HTTP 请求访问以及 挂载HTML网页

• 依赖库

implementation 'org.nanohttpd:nanohttpd:2.3.1'

• 服务器实现

public class HttpServer extends NanoHTTPD {
private static final int HTTP_PORT = 8080;//端口，尽量设置一个不常规的
  HttpServer() {
        super(HTTP_PORT); 
        }
    }
 /**
     * 数据接收
     *
     * @param session
     * @return
     */
    @Override
    public Response serve(IHTTPSession session) {
        return parseRequest(session);
    }



    /**
     * 数据解析
     * @param session
     * @return
     */
    private NanoHTTPD.Response parseRequest(NanoHTTPD.IHTTPSession session) {
        NanoHTTPD.Response response = null;
        if (session.getMethod() == NanoHTTPD.Method.GET) {
            response = parseGetRequest(session);
        } else if (session.getMethod() == NanoHTTPD.Method.POST) {
            response = parsePostRequest(session);
        } else {
            response = responseForNotFound();
        }
        return response;
    }


 /**
     * 解析post请求
     *  /xxx/接口1：代表 两端定义的访问接口，例如：/user/info
     * @param session
     * @return
     */
    private Response parsePostRequest(IHTTPSession session) {
        final Map<String, String> files = parseBody(session);
        NanoHTTPD.Response response = null;
        String paramsMiss = "";
        Map<String, String> params = session.getParms();
        if (session.getParms() == null) {
            return responseParamsNotFound(ResourceUtil.getString(R.string.server_params_error));
        }
        switch (session.getUri()) {
            case "/xxx/接口1":
         
              //根据自己业务返回不同的需求
                response = responseForConfig(HttpResult.getConfigResult());
                break;
            case "/xxx/接口2":
               response=responseForConfig(HttpResult.getNetConfig(mEthernetHelper));
                break;
            default:
                response = responseForNotFound();
                break;
        }
        return response;
    }


   /**
     * 返回指令未知
     *
     * @return
     */
    private NanoHTTPD.Response responseForNotFound() {
        NanoHTTPD.Response.Status status = NanoHTTPD.Response.Status.NOT_FOUND;
        final String mimeType = "text/html";
        return NanoHTTPD.newFixedLengthResponse(status, mimeType, "NOT_FOUND");
    }

/**
*返回指定的错误信息
*/
rivate NanoHTTPD.Response responseParamsNotFound(String msg) {
        NanoHTTPD.Response.Status status = NanoHTTPD.Response.Status.NOT_FOUND;
        final String mimeType = "text/html";
        return NanoHTTPD.newFixedLengthResponse(status, mimeType, msg);
    }


/**
     *返回json串 
     *result:可以是任意Bean转成的字符串，
     * @return
     */
    private Response responseForConfig(String result) {
        NanoHTTPD.Response.Status status = NanoHTTPD.Response.Status.OK;
        String mimeType = "application/json;charset=UTF-8";
        LogHelper.v(TAG, "正在向客户端发送数据 -> " + result);
        return NanoHTTPD.newFixedLengthResponse(status, mimeType, result);
    }



  /**
     * 解析get 请求
     *
     * @param session
     * @return
     */
    private Response parseGetRequest(IHTTPSession session) {
        return getHtmlFileStream(session);
    }

/**
     * 解析访问的mintype类型
     * @param session
     * @return
     */
    private Response getHtmlFileStream(IHTTPSession session) {
        String uri = session.getUri();
        String filename = uri.substring(1);
        boolean is_ascii = true;
        if (uri.equals("/")) {
            filename = "index.html";
        }

        String mimetype = "text/html";
        if (filename.contains(".html") || filename.contains(".htm")) {
            mimetype = "text/html";
            is_ascii = true;
        } else if (filename.contains(".js")) {
            mimetype = "text/javascript";
            is_ascii = true;
        } else if (filename.contains(".css")) {
            mimetype = "text/css";
            is_ascii = true;
        } else if (filename.contains(".gif")) {
            mimetype = "text/gif";
            is_ascii = false;
        } else if (filename.contains(".jpeg") || filename.contains(".jpg")) {
            mimetype = "text/jpeg";
            is_ascii = false;
        } else if (filename.contains(".png")) {
            mimetype = "image/png";
            is_ascii = false;
        } else if (filename.contains(".svg")) {
            mimetype = "image/svg+xml";
            is_ascii = false;
        } else {
            filename = "index.html";
            mimetype = "text/html";
        }
        if (is_ascii) {
            return loadHtml(filename, mimetype);
        } else {
            return loadOrder(filename, mimetype);
        }


    }


   /**
     * 加载非html 类型
     *
     * @param filename
     * @param mimetype
     * @return
     */
    private Response loadOrder(String filename, String mimetype) {
        AssetManager assetManager = BasicApplication.getAppContext().getAssets();
        InputStream isr;
        try {
            isr = assetManager.open(filename);
            return newFixedLengthResponse(Response.Status.OK, mimetype, isr, isr.available());
        } catch (IOException e) {
            e.printStackTrace();
            return newFixedLengthResponse(Response.Status.OK, mimetype, "");
        }
    }


 /**
     * 加载html
     *
     * @param filename
     * @param mimetype
     * @return
     */
    private Response loadHtml(String filename, String mimetype) {
        AssetManager assetManager = BasicApplication.getAppContext().getAssets();
        //通过AssetManager直接打开文件进行读取操作
        StringBuilder response = new StringBuilder();
        String line = "";
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new InputStreamReader(assetManager.open(filename, AssetManager.ACCESS_BUFFER)));

            while ((line = reader.readLine()) != null) {
                response.append(line);
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
            return newFixedLengthResponse(Response.Status.OK, mimetype, "");
        }
        return newFixedLengthResponse(Response.Status.OK, mimetype, response.toString());

    }

}

到此，一个既有post请求也有 HTML网页访问 的HTTP服务器 搭建完毕。

• 返回Result

   /**
     * 此类属于完全自定义，根据自己业务写
   
     */
public class HttpResult<T> {

    private static final int RESULT_CODE_SUCCESS = 0;
    private static final int RESULT_CODE_FILE = 1;
    /**
     * 状态码
     */
    public int code;
    /**
     * 返回结果信息
     */
    public String msg;

    /**
     * 预留
     */
    /**
     * 结果信息
     **/
    public T results;


    /**
     * 获取成功
     *
     * @return
     */
    public static final String getSuccess() {
        final HttpResult httpResult = new HttpResult<>();
        httpResult.code = RESULT_CODE_SUCCESS;
        httpResult.msg = ResourceUtil.getString(
                R.string.server_result_success);
        return JsonUtil.objectToJson(httpResult);
    }

   /**
     * 请求失败
     *
     * @return
     */
    public static String getFail(String paramsMiss) {
        final HttpResult httpResult = new HttpResult<>();
        httpResult.code = RESULT_CODE_FILE;
        httpResult.msg = ResourceUtil.getString(
                R.string.server_result_fail) + (TextUtils.isEmpty(paramsMiss) ? "" : ("," + paramsMiss));
        return JsonUtil.objectToJson(httpResult);
    }

}

• 启动服务
  一般来说，NanoHttp 服务器在Android 上最好放在Service 上去启动或停止 如下：

ublic class HttpService extends Service {

    private HttpServer httpServer;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        httpServer = new HttpServer();
        try {
            httpServer.start(30000);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onDestroy() {
        if (httpServer != null) {
            httpServer.stop();
        }
        super.onDestroy();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return Service.START_STICKY;
    }

    /**
     * 启动服务
     *
     * @param context
     */
    public static final void startService(Context context) {
        Intent intent = new Intent(context,
                HttpService.class);
        context.startService(intent);
    }


    /**
     * 关闭服务
     */
    public static void stopService(Context context) {
        Intent intent = new Intent(context, HttpService.class);
        context.stopService(intent);
    }

以上就是关于一个简单的NanoHTTP 搭建的场景