拦截器

定义一个接口

OnFinishListener.java

public interface OnFinishListener {
    void onFailed(String msg);

    void onSuccess(Object obj);
}

CommonParamsInterceptor.java

public class CommonParamsInterceptor implements Interceptor {


    @Override
    public Response intercept(Chain chain) throws IOException {
        //得到原始的请求对象
        Request request = chain.request();
        //得到用户所使用的请求方式
        String method = request.method();

        if("GET".equals(method)){
            //url
            //原始的请求接口
            String oldUrl = request.url().toString();

            //拼接成一个新的URL
            String newUrl = oldUrl + "&source=android";

            //重新构建请求体
            request = new Request.Builder()
                    .url(newUrl)
                    .build();
        }else if("POST".equals(method)){
            //得到原始的url
            String oldUrl = request.url().toString();
            //得到原有的请求参数
            FormBody oldBody = (FormBody) request.body();//1 2 3

            //新的构建项
            FormBody.Builder builder = new FormBody.Builder();
            for (int i =0 ; i < oldBody.size(); ++i){
                //取出相关请求参数(原有的)
                String name = oldBody.name(i);
                String value = oldBody.value(i);
                //将原始的参数拼装到新的构建体当中
                builder.add(name,value);
            }

            //拼装我们的公共参数
            builder.add("source","android");

            request = new Request.Builder()
                    .url(oldUrl)
                    .post(builder.build())
                    .build();


        }
        //重新发送请求
        return chain.proceed(request);
    }
}

使用：

在okHttpClient后添加拦截器：

  OkHttpClient okHttpClient = new OkHttpClient.Builder()
                //添加应用拦截器
                .addInterceptor(new CommonParamsInterceptor())
                //.addNetworkInterceptor() //添加网络拦截器
                .build();