使用OkHttp的那些事兒(二)

上一篇介紹了關於OkHttp進行GET請求和POST請求最基本的用法,下面繼續介紹OkHttp的使用。
上一篇地址:http://blog.csdn.net/james_shu/article/details/55270728

首先來介紹一下有關於OkHttp將json作爲請求參數來請求服務器端並得到響應的使用流程:

        OkHttpClient client=new OkHttpClient();
        RequestBody requestBody=RequestBody.create(MediaType.parse("application/json;charset=UTF-8"),"{'name':'wangshu','age':18}");
        Request request=new Request.Builder().post(requestBody).url("http://10.0.2.2:8088/TestSpringMVC/postjson").build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
            }
            @Override
            public void onResponse(Call call, final Response response) throws IOException {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Toast.makeText(getApplicationContext(),response.body().string().toString(),Toast.LENGTH_SHORT).show();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                });
            }
        });

我們可以使用OkHTTP來將流作爲請求體以POST的方式請求服務器，通過這種方式我們可以實現文件上傳:

            OkHttpClient client = new OkHttpClient();
            final File file = new File(Environment.getExternalStorageDirectory(), "aaa.txt");
            RequestBody requestBody=new RequestBody() {
                @Override
                public MediaType contentType() {
                    return MediaType.parse("text/x-markdown; charset=utf-8");
                }

                @Override
                public void writeTo(BufferedSink sink) throws IOException {
                   BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream(file)));
                   String line=null;
                   while ((line=reader.readLine())!=null){
                       sink.write(line.getBytes());
                   }
                }

            };
            Request request=new Request.Builder().url("http://10.0.2.2:8088/TestSpringMVC/uploadfile")
                    .post(requestBody)
                    .build();
            client.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {

                }

                @Override
                public void onResponse(Call call, final Response response) throws IOException {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            try {
                                Toast.makeText(getApplicationContext(),response.body().string(),Toast.LENGTH_SHORT).show();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }
            });

下面繼續介紹OkHttp使用緩存:

        OkHttpClient.Builder builder=new OkHttpClient.Builder();
        //設置緩存
        int cacheSize=10*1024*1024;//10M
        Cache cache=new Cache(getCacheDir(),cacheSize);
        builder.cache(cache);
        final OkHttpClient client=builder.build();
        final Request request=new Request.Builder().url("http://publicobject.com/helloworld.txt").build();
        new Thread(){
            @Override
            public void run() {
                super.run();
                try {
                    Response response1=client.newCall(request).execute();
                    System.out.println("Response 1 response:          " + response1);
                    System.out.println("Response 1 cache response:    " + response1.cacheResponse());
                    System.out.println("Response 1 network response:  " + response1.networkResponse());
                    String response1Body = response1.body().string();
                    Response response2 = client.newCall(request).execute();
                    if (!response2.isSuccessful()) throw new IOException("Unexpected code " + response2);
                    String response2Body = response2.body().string();
                    System.out.println("Response 2 response:          " + response2);
                    System.out.println("Response 2 cache response:    " + response2.cacheResponse());
                    System.out.println("Response 2 network response:  " + response2.networkResponse());
                    System.out.println("Response 2 equals Response 1? " + response1Body.equals(response2Body));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }.start();