OkHttp3網絡請求（一）

OkHttp3使用

導入依賴：implementation 'com.squareup.okhttp3:okhttp:4.6.0'
wiki：點擊進入Github
一、GET請求
1、創建OkHttpClient對象，最好使用單例模式：

		okHttpClient = new OkHttpClient.Builder()
                .retryOnConnectionFailure(true)
                .connectTimeout(time_out, TimeUnit.SECONDS)
                .writeTimeout(time_out, TimeUnit.SECONDS)
                .readTimeout(time_out, TimeUnit.SECONDS)
                .build();

2、構造請求：

	Request request = new Request.Builder()
                .url(url)
                .build();

3、處理響應結果

	okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                // handling exception
            }

            @Override
            public void onResponse(Call call, Response response) {
				// Handling response results
            }

        });

二、POST請求
1、創建OkHttpClient對象：

		okHttpClient = new OkHttpClient.Builder()
                .retryOnConnectionFailure(true)
                .connectTimeout(time_out, TimeUnit.SECONDS)
                .writeTimeout(time_out, TimeUnit.SECONDS)
                .readTimeout(time_out, TimeUnit.SECONDS)
                .build();

2、構建請求體RequestBody：

		// 參數
		Map<String, String> params = new HashMap<>();
		FormBody.Builder builder = new FormBody.Builder();
        for (Map.Entry entry : params.entrySet()) {
            builder.add((String) entry.getKey(), (String) entry.getValue());
        }
        RequestBody requestBody = builder.build();
        return new Request.Builder()
                .url(url)
                .post(requestBody)
                .build();

3、處理響應結果

	okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                // handling exception
            }

            @Override
            public void onResponse(Call call, Response response) {
				// Handling response results
            }

        });

這裏是簡單的網絡請求方法，真正開發中肯定少不止這麼簡單，比如你有一些公共參數，你總不能沒創建一個請求都添加一次，所以要添加功能參數就可以在攔截器中做；再比如要對請求參數做加密處理等；攔截器的功能很強大，請移步下一篇。