【Android】OkHttp3總結與封裝

摘要： 開始使用 在app目錄下的build.gradle中新增依賴： implementation 'com.squareup.okhttp3:okhttp:3.13.1' implementation 'com.squareup.okio:okio:2....

開始使用

在app目錄下的build.gradle中新增依賴：

implementation 'com.squareup.okhttp3:okhttp:3.13.1'
implementation 'com.squareup.okio:okio:2.2.2'

GET方法

OkHttpClient client = new OkHttpClient.Builder().build();
Request.Builder builder = new Request.Builder().url(url);
builder.method("GET", null);
Request request = builder.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
...
}

@Override
public void onResponse(Call call, Response response) throws IOException {
...
}
});

GET引數的傳遞可以使用拼接字串的方式直接拼接到url中。

POST方法

OkHttpClient client = new OkHttpClient.Builder().build();
FormBody.Builder formBody = new FormBody.Builder();
formBody.add(key,value);
... // 新增引數
RequestBody form = formBody.build();
Request.Builder builder = new Request.Builder();
Request request = builder.post(form)
.url(url)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
...
}

@Override
public void onResponse(Call call, Response response) throws IOException {
...
}
});

封裝

由於OkHttp傳送請求的方式比較繁瑣，需要構建許多引數，所以需要我們自己進行封裝，以下是我的封裝方式:

/**
- @author:y4ngyy
*/

public class HttpClient {
private OkHttpClient client;
private static HttpClient mClient;
private Context context;
private HttpClient(Context c) {
context = c;
client = new OkHttpClient.Builder()
.cookieJar(new PersistentCookieJar(new SetCookieCache(), new SharedPrefsCookiePersistor(context)))
.followRedirects(true)
.followSslRedirects(true)
.build();
}

public static HttpClient getInstance(Context c){
if (mClient == null) {
mClient = new HttpClient(c);
}
returnmClient;
}


// GET方法
public void get(String url, HashMap<String,String> param, MyCallback callback) {
// 拼接請求引數
if (!param.isEmpty()) {
StringBuffer buffer = new StringBuffer(url);
buffer.append('?');
for (Map.Entry<String,String> entry: param.entrySet()) {
buffer.append(entry.getKey());
buffer.append('=');
buffer.append(entry.getValue());
buffer.append('&');
}
buffer.deleteCharAt(buffer.length()-1);
url = buffer.toString();
}
Request.Builder builder = new Request.Builder().url(url);
builder.method("GET", null);
Request request = builder.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
callback.failed(e);
}

@Override
public void onResponse(Call call, Response response) throws IOException {
callback.success(response);
}
});
}

public void get(String url, MyCallback callback) {
get(url, new HashMap<String, String>(), callback);
}

// POST 方法
public void post(String url, HashMap<String, String> param, MyCallback callback) {
FormBody.Builder formBody = new FormBody.Builder();
if(!param.isEmpty()) {
for (Map.Entry<String,String> entry: param.entrySet()) {
formBody.add(entry.getKey(),entry.getValue());
}
}
RequestBody form = formBody.build();
Request.Builder builder = new Request.Builder();
Request request = builder.post(form)
.url(url)
.build();
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
callback.failed(e);
}

@Override
public void onResponse(Call call, Response response) throws IOException {
callback.success(response);
}
});
}
public interface MyCallback {
void success(Response res) throws IOException;
void failed(IOException e);
}
}

想法有以下幾點：

1. 在get() 和post() 方法中，將需要的引數以HashMap傳遞鍵值對，並把相應操作封裝。
2. 第二個get() 過載是考慮到不需要引數的GET請求的情況。
3. 留下myCallback 介面來對不同請求做處理。
4. 由於需要保持cookie來做登入等操作，所以用到了第三方庫PersistentCookieJar
5. 考慮到cookie的問題，在不同的activity間需要使用同一個例項才行，有想過使用Intent序列化傳遞物件，但由於activity太多，傳遞太繁瑣，所以直接寫成單例模式。

對於OkHttp的原始碼還沒有深究，有時間再繼續研究。

只是菜雞一個..有錯還請指正..繼續努力學習