[置顶] Android OkHttp网络请求拦截器

public class HttpUtils {
private static HttpUtils httpUtils;
private final OkHttpClient client;

private HttpUtils() {
//创建OkHttpClient
//创建拦截器

client = new OkHttpClient.Builder()
.addInterceptor(new MyInterceptor())
.build();
}

public static HttpUtils getHttpUtils() {
if (httpUtils == null) {
synchronized (HttpUtils.class) {
if (httpUtils == null) {
httpUtils = new HttpUtils();
}
}
}
return httpUtils;
}

/**
* GET请求
*
* @param url      请求地址
* @param callback 回调
*/
public void doGet(String url, Callback callback) {
Request request = new Request.Builder().url(url).build();
client.newCall(request).enqueue(callback);
}

/**
* POST请求
*
* @param url      请求地址
* @param params   请求的参数
* @param callback 回调
*/
public void doPost(String url, Map<String, String> params, Callback callback) {
//这里可以加网络判断

//判断参数
if (params == null || params.size() == 0) {
throw new RuntimeException("params is null！！！");
}
// 创建Request
FormBody.Builder builder = new FormBody.Builder();
for (Map.Entry<String, String> entry : params.entrySet()) {
builder.add(entry.getKey(), entry.getValue());
}
FormBody formBody = builder.build();
Request request = new Request.Builder()
.url(url)
.post(formBody)
.build();
client.newCall(request).enqueue(callback);
}
}

public class MyInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
//获取原始的Request请求
//        Request orginRequest = chain.request();
//        FormBody body = (FormBody) orginRequest.body();
//      String name = body.name(0);
//        Request.Builder builder = orginRequest.newBuilder();
//        FormBody formBody = new FormBody.Builder().add("source", "android").build();
//        Request request = builder.post(formBody).build();
//        return chain.proceed(request);

Request original = chain.request();

FormBody formBody = (FormBody) original.body();

String name = formBody.name(0);
String value = formBody.value(0);
FormBody formBody2 = new FormBody.Builder()
.add(name, value)
.add("source", "android").build();

//请求定制：添加请求头
Request request = original.newBuilder()
.url(original.url())
.post(formBody2).build();
return chain.proceed(request);
}