对RocketMQTemplate主要方法进行二次封装 okhttp二次封装

/**
 * 懒汉 安全 加同步
 * 私有的静态成员变量 只声明不创建
 * 私有的构造方法
 * 提供返回实例的静态方法
 */
private static OkHttpClient okHttpClient = null;


private NetWorkOkHttp() {
}

public static OkHttpClient getInstance() {
    if (okHttpClient == null) {
        //加同步安全
        synchronized (NetWorkOkHttp.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())//添加的是应用拦截器...公共参数
                        //.addNetworkInterceptor(new CacheInterceptor())//添加的网络拦截器

                        .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
 */

public static void doGet(String oldUrl, Callback callback) {

    //要添加的公共参数...map
    Map<String,String> map = new HashMap<>();
    map.put("source","android");

    StringBuilder stringBuilder = new StringBuilder();//创建一个stringBuilder

    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....
    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("&"));
    }

    String newUrl = stringBuilder.toString();//新的路径


    //创建OkHttpClient请求对象
    OkHttpClient okHttpClient = getInstance();
    //创建Request
    Request request = new Request.Builder().url(newUrl).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) {
    //要添加的公共参数...map
    Map<String,String> map = new HashMap<>();
    map.put("source","android");


    //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
    for (String key : params.keySet()) {
        builder.add(key, params.get(key));

    }

    //添加公共参数
    for (Map.Entry<String,String> entry: map.entrySet()) {
        builder.add(entry.getKey(),entry.getValue());
    }

    //创建Request
    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) {
    //创建OkHttpClient请求对象
    OkHttpClient okHttpClient = getInstance();

    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(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
        }

        @Override
        public void onResponse(Call call, Response response) throws IOException {
            //上传成功回调 目前不需要处理
            if (response.isSuccessful()){
                String s = response.body().string();
            }
        }
    });

}

/**
 * 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) {
    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 {
                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
                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();
        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);
}

/**
 * 公共参数拦截器
 */
private static class CommonParamsInterceptor implements Interceptor {

    //拦截的方法
    @Override
    public Response intercept(Chain chain) throws IOException {

        //获取到请求
        Request request = chain.request();
        //获取请求的方式
        String method = request.method();
        //获取请求的路径
        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)){
            // 1.http://www.baoidu.com/login                --------？ key=value&key=value
            // 2.http://www.baoidu.com/login?               --------- key=value&key=value
            // 3.http://www.baoidu.com/login?mobile=11111    -----&key=value&key=value

            StringBuilder stringBuilder = new StringBuilder();//创建一个stringBuilder

            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....
            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("&"));
            }

            String newUrl = stringBuilder.toString();//新的路径

            //拿着新的路径重新构建请求
            request = request.newBuilder()
                    .url(newUrl)
                    .build();


        }else if ("POST".equals(method)){
            //先获取到老的请求的实体内容
            RequestBody oldRequestBody = request.body();//....之前的请求参数,,,需要放到新的请求实体内容中去

            //如果请求调用的是上面doPost方法
            if (oldRequestBody instanceof FormBody){
                FormBody oldBody = (FormBody) oldRequestBody;

                //构建一个新的请求实体内容
                FormBody.Builder builder = new FormBody.Builder();
                //1.添加老的参数
                for (int i=0;i<oldBody.size();i++){
                    builder.add(oldBody.name(i),oldBody.value(i));
                }
                //2.添加公共参数
                for (Map.Entry<String,String> entry:map.entrySet()) {

                    builder.add(entry.getKey(),entry.getValue());
                }

                FormBody newBody = builder.build();//新的请求实体内容

                //构建一个新的请求
                request = request.newBuilder()
                        .url(oldUrl)
                        .post(newBody)
                        .build();
            }


        }


        Response response = chain.proceed(request);

        return response;
    }
}

/**
 * 网络缓存的拦截器......注意在这里更改cache-control头是很危险的,一般客户端不进行更改,,,,服务器端直接指定
 *
 * 没网络取缓存的时候,一般都是在数据库或者sharedPerfernce中取出来的
 *
 *
 *
 */