OkHttp以及Volley简答介绍以及使用
Android
- OkHttp
- Volley
OkHttp
Okhttp(第三方框架，必须掌握，需要封装)
okhttp是一个第三方类库，用于android中请求网络。
这是一个开源项目,是安卓端最火热的轻量级框架,由移动支付Square公司贡献(该公司还贡献了Picasso和LeakCanary) 。用于替代HttpUrlConnection和Apache HttpClient(android API23 里已移除HttpClient)。
1.同步get请求：开启子线程
2.同步post请求：开启子线程
3.异步get请求：不需要开启子线程
4.异步post请求：不需要开启子线程
Volley
所谓Volley,它是2013年Google I/O上发布的一款网络框架，基于Android平台，能使网络通信更快，更简单，更健全
优点：
（1）默认Android2.3及以上基于HttpURLConnection，2.3以下使用基于HttpClient；
（2）符合Http 缓存语义 的缓存机制（提供了默认的磁盘和内存等缓存）；
（3）请求队列的优先级排序；
（4）提供多样的取消机制；
（5）提供简便的图片加载工具（其实图片的加载才是我们最为看重的功能）；（6）一个优秀的框架。
缺点：
它只适合数据量小，通信频繁的网络操作，如果是数据量大的，像音频，视频等的传输，还是不要使用Volley的为好
工作原理
其中蓝色的是主线程，绿色的是缓存线程，黄色的是网络线程
1.当一个Request请求添加到RequestQueue请求队列中，Volley就开始工作了。RequestQueue请求队列中持有一个CacheDispatcher缓存管家和一组NetworkDispatcher网络管家。
2.RequestQueue会先叫来CacheDispatcher缓存管家，让他去看看，当前请求的数据在没在cache中。
2.1.当前的数据在cache中，那就把数据从cache中取出来，然后经过一番加工，将加工好的数据交付给主线程
2.2.当前数据没在cache中，进行第3步
3.进行到了这一步，那肯定是数据没有在缓存中，那只能去网络中获取了，这时候RequestQueue会叫来NetworkDispatcher，NetworkDispatcher可是有一帮呢，其实这是一个线程池，默认情况下会启动4个线程去网络下载数据。所以RequestQueue把当前闲着的NetworkDispatcher叫来，给他们分配任务。
4.拿到任务的NetworkDispatcher就会去网络上下载数据了，与此同时，他会判断下载到的数据能否写入到cache缓存中，如果可以的话就写入cache，以便于下一次直接从cache中获取到数据。最后，将数据加工，交付给主线程。
package com.example.posthhttpurl;
import android.graphics.Bitmap;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import com.android.volley.AuthFailureError;
import com.android.volley.RequestQueue;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.ImageRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView=findViewById(R.id.image);
//http://10.211.55.6:8080/lianxi/login
//同步get的
// new MythreadPost("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&").start();
// new MyOkHttpThread().start();//同步post的
// ayncGet();//异步get的
// asyncPost();//异步post的
// Bolleyget();//Volleyget的
// volleypost();//Volleypost的
volleyImage();//图片的
}
class MythreadPost extends Thread {
String ss;
public MythreadPost(String ss) {
this.ss = ss;
}
@Override
public void run() {
super.run();
try {
URL url = new URL(ss);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setReadTimeout(200);
connection.setConnectTimeout(200);
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setUseCaches(false);
OutputStream outputStream = connection.getOutputStream();
String parm = "page";
String vlaue = "2";
outputStream.write("page=2".getBytes());
// outputStream.flush();
outputStream.close();
Log.d("3######", ss);
if (connection.getResponseCode() == 200) {
byte[] bytes = new byte[1024];
int len = 0;
StringBuilder builder = new StringBuilder();
InputStream inputStream = connection.getInputStream();
while ((len = inputStream.read(bytes)) != -1) {
String s = new String(bytes, 0, len);
builder.append(s);
}
Log.d("3######", builder.toString());
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
class MyOkHttpThread extends Thread {
@RequiresApi(api = Build.VERSION_CODES.N)
@Override
public void run() {
super.run();
// mYokHttp();
OkHTTP_post();
}
}
/**
* OKHttp 同步的方式获取网络数据
*/
@RequiresApi(api = Build.VERSION_CODES.N)
public void mYokHttp() {
// OkHttpClient.Builder builder = new OkHttpClient.Builder();
// builder.connectTimeout(20000, TimeUnit.MILLISECONDS);//设置链接超时
// builder.readTimeout(4,TimeUnit.MINUTES);//分钟
// OkHttpClient client=builder.build();//客户端
//
//// Request.Builder builder1=new Request.Builder();
//// builder1.url("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&");//访问网址
//// Request request=builder1.build();
//
Request request1=new Request.Builder().url("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&").get().build();
Call call=client.newCall(request1);
try {
Response execute = call.execute();
String s = execute.body().string();//拿到Json串
Log.d("3######", s);
} catch (IOException e) {
e.printStackTrace();
}
Request request = new Request.Builder().url("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&").get().build();
OkHttpClient client1 = new OkHttpClient();
try {
Response response = client1.newCall(request).execute();
if (response.isSuccessful()) {
String json = response.body().string();
Log.d("#####", json);
} else {
Log.d("#####", "失败");
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 同步的Post方式
*/
public void OkHTTP_post() {
// Request.Builder rebuilder=new Request.Builder();
//
// rebuilder.url("https://www.apiopen.top/createUser?key=00d91e8e0cca2b76f515926a36db68f5&");
// FormBody.Builder builder=new FormBody.Builder();
// builder.add("phone","156416518613");
// builder.add("passwd","00000");
// FormBody build = builder.build();
// rebuilder.post(build);
//
//
// Request request=rebuilder.build();
// OkHttpClient.Builder builder1=new OkHttpClient.Builder();
// OkHttpClient build1 = builder1.build();
//Call call = build1.newCall(request);
// try {
// String string = call.execute().body().string();
// Log.d("#####", string);
// } catch (IOException e) {
// e.printStackTrace();
// }
RequestBody body = new FormBody.Builder().add("phone", "sdf")
.add("passwd", "123").build();
Request request = new Request.Builder().url("https://www.apiopen.top/createUser?key=00d91e8e0cca2b76f515926a36db68f5&")
.post(body).build();
OkHttpClient client = new OkHttpClient();
try {
Response execute = client.newCall(request).execute();
if (execute.isSuccessful()) {
String string = execute.body().string();
Log.d("#####", string);
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 异步getOkhttp
*/
public void ayncGet() {
//获得请求对象
Request request = new Request.Builder().url("http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&").get().build();
//获取客户端对象
OkHttpClient client = new OkHttpClient();
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 {
String string = response.body().string();
Log.d("#####", string);
}
});
}
public void asyncPost() {
OkHttpClient okHttpClient = new OkHttpClient();
FormBody body = new FormBody.Builder()
.add("phone", "qqeasd")
.add("passwd", "123")
.build();
Request request = new Request.Builder().url("https://www.apiopen.top/createUser?key=00d91e8e0cca2b76f515926a36db68f5&").post(body).build();
Call call = okHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String string = response.body().string();
Log.d("#####", string);
}
});
}
//VolleyGet
public void Bolleyget() {
RequestQueue queue = Volley.newRequestQueue(this);
StringRequest request = new StringRequest(StringRequest.Method.GET, "http://www.qubaobei.com/ios/cf/dish_list.php?stage_id=1&limit=10&", listener, errlistener);
queue.add(request);//将请求添加到队列
queue.start();//启动队列
}
//VolleyPost
public void volleypost(){
RequestQueue queue = Volley.newRequestQueue(this);
StringRequest request=new StringRequest(StringRequest.Method.POST,"https://www.apiopen.top/createUser?key=00d91e8e0cca2b76f515926a36db68f5&", listener, errlistener){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
HashMap<String,String> map=new HashMap<>();
map.put("phone","yzh");
map.put("passwd","yzh");
return map;
}
};
queue.add(request);
queue.start();
}
//VolleyImage
public void volleyImage(){
RequestQueue queue = Volley.newRequestQueue(this);
ImageRequest request=new ImageRequest("http://e0.ifengimg.com/07/2019/0203/7909002DC8B62C351C154574DE1C071F2B30AE62_size15_w580_h326.jpeg",imager,500,500, Bitmap.Config.RGB_565,errlistener);
queue.add(request);
queue.start();
}
com.android.volley.Response.Listener imager = new com.android.volley.Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap response) {
imageView.setImageBitmap(response);
}
};
com.android.volley.Response.Listener listener = new com.android.volley.Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("#####", response);
}
};
com.android.volley.Response.ErrorListener errlistener = new com.android.volley.Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
};
}