OKHttp通信使用（一）

来源：互联网发布：linux mv f 目录非空编辑：程序博客网时间：2024/05/16 17:18

概念：

Android 提供了两种HTTP通信方式：一种是Java原生的Apache的HTTP通信：HttpClient ,另一种是android所使用的HttpURLConnection。

作为较为成熟的HTTP通信机制OKHTTP正在取代上述两种HTTP通信方式，在android 4.4版本后，Volley也剔除了HttpURLConnection，改为使用OKHTTP进行通信。它的优势在于更稳定，可以设置多个IP地址进行失败连接问题的处理等等。在进行HTTPS访问时也更加稳定和安全。

下面是OKHTTP的简单应用。主要来自于GitHub:https://github.com/square/okhttp/wiki

OKHTTP支持所有的HTTP请求方式：GET,POST,HEAD.....这里主要是进行GET与POST为例进行介绍。

OKHTTP有两种请求方式：

同步方式：

execute

异步方式：

enqueue

使用方式：

为一下所有函数定义全局变量：

private final OkHttpClient client = new OkHttpClient();

GET请求：

使用get请求下载文件，返回的是String。

 public void run() throws Exception {        Request request = new Request.Builder()                .url("http://publicobject.com/helloworld.txt")                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);                Headers responseHeaders = response.headers();                for (int i = 0, size = responseHeaders.size(); i < size; i++) {                    System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));                }                System.out.println(response.body().string());            }        });    }

使用Get请求JSON数据：

    static class Gist {        Map<String, GistFile> files;    }    static class GistFile {        String content;    }    private final Gson gson = new Gson();    public void run_JSON() throws Exception {        Request request = new Request.Builder()                .url("https://api.github.com/gists/c2a7c39532239ff261be")                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);                Gist gist = gson.fromJson(response.body().charStream(), Gist.class);                for (Map.Entry<String, GistFile> entry : gist.files.entrySet()) {                    System.out.println("11111111111111111111 "+entry.getKey());                    System.out.println(entry.getValue().content);                }            }        });    }

POST请求：

使用POST发送一个String型数据：

 public static final MediaType MEDIA_TYPE_MARKDOWN            = MediaType.parse("text/x-markdown; charset=utf-8"); //content-type    /**     * 发送一个string型数据     * @throws Exception     */    public void run_string() throws Exception {        String postBody = ""                + "Releases\n"                + "--------\n"                + "\n"                + " * _1.0_ May 6, 2013\n"                + " * _1.1_ June 15, 2013\n"                + " * _1.2_ August 11, 2013\n";        Request request = new Request.Builder()                .url("https://api.github.com/markdown/raw")                .post(RequestBody.create(MEDIA_TYPE_MARKDOWN, postBody))                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);                System.out.println(response.body().string());            }        });    }

使用POST请求发送一个键值对：

    /**     * 发送一个post键值对参数     * @throws Exception     */    public void run_keyValue() throws Exception {        RequestBody formBody = new FormBody.Builder()                .add("search", "Jurassic Park")                .build();        Request request = new Request.Builder()                .url("https://en.wikipedia.org/w/index.php")                .post(formBody)                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);                System.out.println(response.body().string());            }        });    }

使用POST发送一个数据流：

 /**     * //发送一个流     * @throws Exception     */    public void run_Streaming() throws Exception {        RequestBody requestBody = new RequestBody() {            @Override public MediaType contentType() {                return MEDIA_TYPE_MARKDOWN;            }            @Override public void writeTo(BufferedSink sink) throws IOException {                sink.writeUtf8("Numbers\n");                sink.writeUtf8("-------\n");                for (int i = 2; i <= 997; i++) {                    sink.writeUtf8(String.format(" * %s = %s\n", i, factor(i)));                }            }            private String factor(int n) {                for (int i = 2; i < n; i++) {                    int x = n / i;                    if (x * i == n) return factor(x) + " × " + i;                }                return Integer.toString(n);            }        };        Request request = new Request.Builder()                .url("https://api.github.com/markdown/raw")                .post(requestBody)                .build();        client.newCall(request).enqueue(new Callback() {            @Override            public void onFailure(Call call, IOException e) {            }            @Override            public void onResponse(Call call, Response response) throws IOException {                if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);                System.out.println(response.body().string());            }        });    }

0 0