OkHttp（拦截器，单例模式，get，post）

package com.bw.week3_practice.network;

import android.os.Environment;
import android.os.Handler;
import android.util.Log;

import com.google.gson.Gson;

import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class HttpUtils {

private static final String TAG = "HttpUtils";
private static volatile HttpUtils instance;
public Handler handler = new Handler();
private OkHttpClient client;

private Interceptor getAppInterceptor() {
//添加拦截器
Interceptor interceptor = new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Log.e("++++++++++", "拦截前");
//---------请求之前------------
Response response = chain.proceed(request);
Log.e("++++++++++", "拦截后");
//---------请求之后------------
return response;
}
};
return interceptor;
}

private HttpUtils() {
File file = new File(Environment.getExternalStorageDirectory(), "cache11");
client = new OkHttpClient().newBuilder()
.readTimeout(3000, TimeUnit.SECONDS)   //设置读取超时时间
.connectTimeout(3000, TimeUnit.SECONDS) //设置连接的超时时间
.addInterceptor(getAppInterceptor())//Application拦截器
.cache(new Cache(file, 10 * 1024))
.build();
}

//单例okhttp
public static HttpUtils getInstance() {
if (instance == null) {
synchronized (HttpUtils.class) {
if (null == instance) {
instance = new HttpUtils();
}
}
}
return instance;
}

public void doGet(String url, final Class clazz, final NetCallBack netCallBack) {
// 2. 创建一个请求对象
Request request = new Request.Builder()
.get()
.url(url)
.build();

// 3. 创建出一个Call对象
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
handler.post(new Runnable() {
@Override
public void run() {
netCallBack.onFailure(e);
}
});

}

@Override
public void onResponse(Call call, Response response) throws IOException {
// 注意：response.body()只能用一次
String result = response.body().string();

Gson gson = new Gson();
final Object o = gson.fromJson(result, clazz);

handler.post(new Runnable() {
@Override
public void run() {
netCallBack.onSuccess(o);
}
});
}
});
}

public void doPost(String url, final Class clazz, Map<String, String> parms, final NetCallBack netCallBack) {
//不是FormBody，而是一个Builder
FormBody.Builder body = new FormBody.Builder();
//key   value
for (String key : parms.keySet()) {
//value的值
body.add(key, parms.get(key));
}
Request request = new Request.Builder()
.url(url)
.post(body.build())
.build();
// 3. 创建出一个Call对象
Call call = client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
handler.post(new Runnable() {
@Override
public void run() {
netCallBack.onFailure(e);
}
});
}

@Override
public void onResponse(Call call, Response response) throws IOException {
// 注意：response.body()只能用一次
String result = response.body().string();
Gson gson = new Gson();
final Object oj = gson.fromJson(result, clazz);
handler.post(new Runnable() {
@Override
public void run() {
netCallBack.onSuccess(oj);
}
});
}
});
}

public interface NetCallBack {
void onSuccess(Object oj);
void onFailure(Exception e);
}

}