//OkHttp网络请求工具类

电玩女神 2023-10-17 22:11 22阅读 0赞

//OkHttp网络请求工具类
    public class OkHttp3Util_03 {
        /**
         * 懒汉 安全 加同步
         * 1.私有的静态成员变量 只声明不创建
         * 2.私有的构造方法
         * 3.提供返回实例的静态方法
         */
        private static OkHttpClient okHttpClient = null;
        private OkHttp3Util_03() {
        }
        public static OkHttpClient getInstance() {
            if (okHttpClient == null) {
                //加同步安全
                synchronized (OkHttp3Util_03.class) {
                    if (okHttpClient == null) {
                        //okhttp可以缓存数据....指定缓存路径
                        File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
                        //指定缓存大小
                        int cacheSize = 10 * 1024 * 1024;
                        okHttpClient = new OkHttpClient.Builder()//构建器
                                .connectTimeout(15, TimeUnit.SECONDS)//连接超时
                                .writeTimeout(20, TimeUnit.SECONDS)//写入超时
                                .readTimeout(20, TimeUnit.SECONDS)//读取超时
                                .addInterceptor(new CommonParamsInterceptor())//添加应用拦截器的方法
                                .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))//设置缓存
                                .build();
                    }
                }
            }
            return okHttpClient;
        }
        /**
         * get请求
         * 参数1 url
         * 参数2 回调Callback
         *
         * oldUrl表示老的地址,,,是没封装公共参数之前的地址....公共参数指的是source=android
         *
         */
        public static void doGet(String oldUrl, Callback callback) {
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getInstance();
            //创建Request
            Request request = new Request.Builder().url(oldUrl).build();
            //得到Call对象
            Call call = okHttpClient.newCall(request);
            //执行异步请求
            call.enqueue(callback);
        }
        /**
         * post请求
         * 参数1 url
         * 参数2 Map<String, String> params post请求的时候给服务器传的数据
         *      add..("","")
         *      add()
         */
        public static void doPost(String url, Map<String, String> params, Callback callback) {
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getInstance();
            //3.x版本post请求换成FormBody 封装键值对参数
    
            FormBody.Builder builder = new FormBody.Builder();
            //遍历集合,,,map集合遍历方式
            for (String key : params.keySet()) {
                builder.add(key, params.get(key));
            }
    
            //创建Request....formBody...new formBody.Builder()...add()....build()
            Request request = new Request.Builder().url(url).post(builder.build()).build();
            Call call = okHttpClient.newCall(request);
            call.enqueue(callback);
        }
        /**
         * post请求上传文件....包括图片....流的形式传任意文件...
         * 参数1 url
         * file表示上传的文件
         * fileName....文件的名字,,例如aaa.jpg
         * params ....传递除了file文件 其他的参数放到map集合
         *
         */
        public static void uploadFile(String url, File file, String fileName,Map<String,String> params,Callback callback) {
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getInstance();
    
            //MultipartBody多功能的请求实体对象,,,formBody只能传表单形式的数据
            MultipartBody.Builder builder = new MultipartBody.Builder();
            builder.setType(MultipartBody.FORM);
    
            //参数
            if (params != null){
                for (String key : params.keySet()){
                    builder.addFormDataPart(key,params.get(key));
                }
            }
            //文件...参数name指的是请求路径中所接受的参数...如果路径接收参数键值是fileeeee,此处应该改变
            builder.addFormDataPart("file",fileName, RequestBody.create(MediaType.parse("application/octet-stream"),file));
            //构建
            MultipartBody multipartBody = builder.build();
            //创建Request
            Request request = new Request.Builder().url(url).post(multipartBody).build();
            //得到Call
            Call call = okHttpClient.newCall(request);
            //执行请求
            call.enqueue(callback);
        }
        /**
         * Post请求发送JSON数据....{"name":"zhangsan","pwd":"123456"}
         * 参数一：请求Url
         * 参数二：请求的JSON
         * 参数三：请求回调
         */
        public static void doPostJson(String url, String jsonParams, Callback callback) {
            RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
            Request request = new Request.Builder().url(url).post(requestBody).build();
            Call call = getInstance().newCall(request);
            call.enqueue(callback);
        }
        /**
         * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装
         * 参数er：请求Url
         * 参数san：保存文件的文件夹....download
         */
        public static void download(final Activity context, final String url, final String saveDir) {
            //get请求
            Request request = new Request.Builder().url(url).build();
            Call call = getInstance().newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    //com.orhanobut.logger.Logger.e(e.getLocalizedMessage());
                }
                @Override
                public void onResponse(Call call, final Response response) throws IOException {
                    InputStream is = null;
                    byte[] buf = new byte[2048];
                    int len = 0;
                    FileOutputStream fos = null;
                    try {
                        //response.body().string()...json限制是1M大小...byteStream()流的方式
                        is = response.body().byteStream();//以字节流的形式拿回响应实体内容
                        //apk保存路径
                        final String fileDir = isExistDir(saveDir);
                        //文件
                        File file = new File(fileDir, getNameFromUrl(url));
                        fos = new FileOutputStream(file);
                        while ((len = is.read(buf)) != -1) {
                            fos.write(buf, 0, len);
                        }
                        fos.flush();
                        context.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(context, "下载成功:" + fileDir + "," + getNameFromUrl(url), Toast.LENGTH_SHORT).show();
                            }
                        });
                        //apk下载完成后 调用系统的安装方法......覆盖安装,,,只有包名和签名的应用,并且版本和版本号升级后的才能安装
                        Intent intent = new Intent(Intent.ACTION_VIEW);
                        intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
                        context.startActivity(intent);
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (is != null) is.close();
                        if (fos != null) fos.close();
                    }
                }
            });
        }
        /**
         * 判断下载目录是否存在......并返回绝对路径
         * @param saveDir
         * @return
         * @throws IOException
         */
        public static String isExistDir(String saveDir) throws IOException {
            // 下载位置
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    
                File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);
                if (!downloadFile.mkdirs()) {
                    downloadFile.createNewFile();
                }
                String savePath = downloadFile.getAbsolutePath();
                Log.e("savePath", savePath);
                return savePath;
            }
            return null;
        }
        /**
         * @param url
         * @return 从下载连接中解析出文件名
         */
        private static String getNameFromUrl(String url) {
            return url.substring(url.lastIndexOf("/") + 1);
        }
        /**
         * 封装公共参数的拦截器
         */
        private static class CommonParamsInterceptor implements Interceptor {
            //intercept方法就是拦截的意思....拦截的是一个请求,,,一旦拦截之后可以对请求的参数进行处理
            //Chain chain 链条的意思
            @Override
            public Response intercept(Chain chain) throws IOException {
                Log.e("----","拦截器------");
    
                //调用request()方法得到拦截的请求
                Request request = chain.request();
    
                //获取请求的方式
                String method = request.method();//GET POST
                //拦截的请求的路径
                String oldUrl = request.url().toString();
    
                //要添加的公共参数...map
                Map<String,String> map = new HashMap<>();
                map.put("source","android");
                if ("GET".equals(method)){
                    StringBuilder stringBuilder = new StringBuilder();//创建一个stringBuilder...字符串缓冲区
                    stringBuilder.append(oldUrl);
                    if (oldUrl.contains("?")){
                        //?在最后面....2类型
                        if (oldUrl.indexOf("?") == oldUrl.length()-1){
                        }else {
                            //3类型...拼接上&
                            stringBuilder.append("&");
                        }
                    }else {
                        //不包含? 属于1类型,,,先拼接上?号
                        stringBuilder.append("?");
                    }
    
                    //添加公共参数....source=android&appVersion=100&
                    for (Map.Entry<String,String> entry: map.entrySet()) {
                        //拼接
                        stringBuilder.append(entry.getKey())
                                .append("=")
                                .append(entry.getValue())
                                .append("&");
                    }
    
                    //删掉最后一个&符号
                    if (stringBuilder.indexOf("&") != -1){
                        stringBuilder.deleteCharAt(stringBuilder.lastIndexOf("&"));
                    }
                    //得到含有公共参数的新路径.....使用新路径去请求
                    String newUrl = stringBuilder.toString();
                    //新的路径构建一个新的请求
                    request = request.newBuilder().url(newUrl).build();
    
                }else if ("POST".equals(method)){
                    Log.e("--oldUrl--",oldUrl);
                    //参数在请求的实体内容上....拿到以前的参数,把以前的参数和公共参数全都添加到请求实体上
                    RequestBody requestBody = request.body();
                    if (requestBody instanceof FormBody){
      //前边是不是后边的子类/实例对象
                        FormBody oldBody = (FormBody) requestBody;//keywords...page
                        FormBody.Builder builder = new FormBody.Builder();
                        //先添加之前的参数
                        for (int i = 0;i<oldBody.size();i++){
                            //键值对的形式添加
                            builder.add(oldBody.name(i),oldBody.value(i));
                        }
                        //添加公共参数
                        for (Map.Entry<String,String> entry: map.entrySet()) {
                            builder.add(entry.getKey(),entry.getValue());
                        }
                        //构建一个新的请求
                        request = request.newBuilder().url(oldUrl).post(builder.build()).build();
                    }
                }
                //执行请求 获取到响应
                Response response = chain.proceed(request);
                return response;
            }
        }
    }