OKHttp 上手记录

简介：Android提供了两种HTTP通信类，HttpURLConnection和HttpClient。OKHttp是一个相对成熟的解决方案，处理了很网网络疑难杂症：会从很多常用的连接问题中自动恢复。如果服务器配置了多个IP地址，当第一个IP连接失败时，OkHttp会自动尝试下一个IP。OkHttp还处理了代理服务器问题和SSL握手失败问题。OkHttp无需重写程序中的网络代码。OkHttp实现了几乎和java.net.HttpURLConnection一样的API。如果你用了Apache HttpClient，则OKHttp也提供了一个对应的okhttp-apache模块。

入门

官网：http://square.github.io/okhttp/
Git：https://github.com/square/okhttp

访问http

使用步骤：

android studio 添加引用

dependencies {    compile 'com.squareup.okio:okio:1.5.0'    compile 'com.squareup.okhttp3:okhttp:3.5.0'}

get 示例

    public static String sendGet(String url, String param) {        Request request = new Request.Builder().url(url + "?" + param).build();        try {            Response response = client.newCall(request).execute();            if (!response.isSuccessful()) {                return "";            }            return response.body().string();        }        catch(Exception e){            return "";        }    }

异步get

        Request request = new Request.Builder().url(url).build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call arg0, IOException arg1) {                //            }            @Override            public void onResponse(Call arg0, Response arg1) throws IOException {                //            }        });

post 示例

 public static String sendPost(String url, String param,String authorization) {        FormBody.Builder formBuilder = new FormBody.Builder();        String[] array=param.split("&");        for(int i=0;i<array.length;i++){            String[] temp=array[i].split("=");            if(temp.length==2)            formBuilder.add(temp[0],temp[1]);            else                formBuilder.add(temp[0],"");        }        RequestBody body=formBuilder.build();        Request request = new Request.Builder()                .url(url)                .post(body)                .addHeader("Authorization",authorization)                .build();        try {            Response response = client.newCall(request).execute();            if (!response.isSuccessful()) return "";            return response.body().string();        }catch(Exception e){            return "";        }    }

访问https

   public static String sendPost(Context mContext,String url, String param,String authorization) {        X509TrustManager trustManager;        SSLSocketFactory sslSocketFactory;        final InputStream inputStream;        try{            inputStream = mContext.getAssets().open("test1.cer"); // 得到证书的输入流            try {                trustManager = trustManagerForCertificates(inputStream);//以流的方式读入证书                SSLContext sslContext = SSLContext.getInstance("TLS");                sslContext.init(null, new TrustManager[]{trustManager}, null);                sslSocketFactory = sslContext.getSocketFactory();                //----                FormBody.Builder formBuilder = new FormBody.Builder();                String[] array=param.split("&");                for(int i=0;i<array.length;i++){                    String[] temp=array[i].split("=");                    if(temp.length==2)                        formBuilder.add(temp[0],temp[1]);                    else                        formBuilder.add(temp[0],"");                }                RequestBody body=formBuilder.build();                client=new OkHttpClient.Builder()                        .sslSocketFactory(sslSocketFactory, trustManager)                        .build();                Request request = new Request.Builder()                        .url(url)                        .post(body)                        .addHeader("Authorization",authorization)                        .build();                try {                    Response response = client.newCall(request).execute();                    if (!response.isSuccessful()) return "";                    String result=response.body().string();                    return result;                }catch(Exception e){                    return "";                }                //----            } catch (GeneralSecurityException e) {                throw new RuntimeException(e);            }        }catch(IOException e){            return "";        }    }    private static X509TrustManager trustManagerForCertificates(InputStream in)            throws GeneralSecurityException {        CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");        Collection<? extends Certificate> certificates = certificateFactory.generateCertificates(in);        if (certificates.isEmpty()) {            throw new IllegalArgumentException("expected non-empty set of trusted certificates");        }        // Put the certificates a key store.        char[] password = "password".toCharArray(); // Any password will work.        KeyStore keyStore = newEmptyKeyStore(password);        int index = 0;        for (Certificate certificate : certificates) {            String certificateAlias = Integer.toString(index++);            keyStore.setCertificateEntry(certificateAlias, certificate);        }        // Use it to build an X509 trust manager.        KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(                KeyManagerFactory.getDefaultAlgorithm());        keyManagerFactory.init(keyStore, password);        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(                TrustManagerFactory.getDefaultAlgorithm());        trustManagerFactory.init(keyStore);        TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();        if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {            throw new IllegalStateException("Unexpected default trust managers:"                    + Arrays.toString(trustManagers));        }        return (X509TrustManager) trustManagers[0];    }    /**     * 添加password     * @param password     * @return     * @throws GeneralSecurityException     */    private static KeyStore newEmptyKeyStore(char[] password) throws GeneralSecurityException {        try {            KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType()); // 这里添加自定义的密码，默认            InputStream in = null; // By convention, 'null' creates an empty key store.            keyStore.load(in, password);            return keyStore;        } catch (IOException e) {            throw new AssertionError(e);        }    }

注意事项：
如果直接引用jar包，注意引用OkHttp包后，还需要引用okio-1.11.0.jar的包才能使用。

其它网上示例：
http://blog.csdn.net/xwdoor/article/details/51063673
http://www.jcodecraeer.com/a/anzhuokaifa/androidkaifa/2015/0106/2275.html