okhttp3Util工具类二次封装//及拦截器添加公共参数

public class OkHttp3Util {    /**     * 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 OkHttp3Util() {    }    public static OkHttpClient getInstance() {        if (okHttpClient == null) {            //加同步安全            synchronized (OkHttp3Util.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                            //添加应用拦击器,添加公共参数//                            .addInterceptor(new CommonParamsInterceptor())//添加应用拦击器,添加公共参数                            .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 url, Callback callback) {        //创建OkHttpClient请求对象        OkHttpClient okHttpClient = getInstance();        //创建Request        Request request = new Request.Builder().url(url).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        for (String key : params.keySet()) {            builder.add(key, params.get(key));        }        //创建Request        Request request = new Request.Builder().url(url).post(builder.build()).build();        Call call = okHttpClient.newCall(request);        call.enqueue(callback);    }    /**     * 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();            Log.e("---拦截器",request.url()+"---"+request.method()+"--"+request.header("User-agent"));            //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;        }    }}