Android系统提供了两种HTTP通信类，HttpURLConnection和HttpClient。
尽管Google在大部分安卓版本中推荐使用HttpURLConnection，但是这个类相比HttpClient实在是太难用，太弱爆了。OkHttp 处理了很多网络疑难杂症：会从很多常用的连接问题中自动恢复。如果您的服务器配置了多个IP地址，当第一个IP连接失败的时候，OkHttp会自动尝试下一个IP。OkHttp还处理了代理服务器问题和SSL握手失败问题。使用 OkHttp 无需重写您程序中的网络代码。OkHttp实现了几乎和java.net.HttpURLConnection一样的API。如果你用了 Apache HttpClient，则OkHttp也提供了一个对应的okhttp-apache 模块。
以下是我写的一个OKHttp原生API的使用以及国内某大牛封装的OKHttpUtil的使用方法Demo
package com.jereh.learnbymyself.OKHttp;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.jereh.learnbymyself.R;
import com.zhy.http.okhttp.OkHttpUtils;
import com.zhy.http.okhttp.callback.BitmapCallback;
import com.zhy.http.okhttp.callback.FileCallBack;
import com.zhy.http.okhttp.callback.StringCallback;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import okhttp3.Call;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public class OKHttpActivity extends AppCompatActivity implements View.OnClickListener {
public static final int POST = 2;
private static final int GET = 1;
private Button btn_get_post, btn_get_okhttputils, btn_downloadfile,btn_uploadfile,btn_image;
private TextView tv_result;
private ProgressBar progressBar;
private ImageView iv_icon;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_okhttp);
btn_get_post = (Button) findViewById(R.id.btn_get_post);
tv_result = (TextView) findViewById(R.id.tv_result);
btn_get_okhttputils = (Button) findViewById(R.id.btn_get_okhttputils);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
btn_downloadfile = (Button) findViewById(R.id.btn_downloadfile);
btn_uploadfile = (Button) findViewById(R.id.btn_uploadfile);
btn_image = (Button) findViewById(R.id.btn_image);
iv_icon = (ImageView) findViewById(R.id.iv_icon);
tv_result.setOnClickListener(this);
btn_uploadfile.setOnClickListener(this);
btn_get_post.setOnClickListener(this);
btn_get_okhttputils.setOnClickListener(this);
btn_downloadfile.setOnClickListener(this);
btn_image.setOnClickListener(this);
}
private static final String TAG = "haoren";
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_get_post: //使用原生的OKHttp 请求网络，get和post:
tv_result.setText("");
getDataFromPost();
break;
case R.id.btn_get_okhttputils: //使用封装util
getDataByUtil();
break;
case R.id.btn_downloadfile:
downloadFile();
break;
case R.id.btn_uploadfile:
fileUpload();
break;
case R.id.btn_image:
getImg();
break;
}
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 1:
//获取数据
tv_result.setText((String) msg.obj);
break;
case POST:
//获取数据
tv_result.setText((String) msg.obj);
break;
}
}
};
/**
* 使用get请求
*/
private void getDataFromGet() {
new Thread() {
@Override
public void run() {
try {
String result = get(url);
Log.d(TAG, "onClick: " + result.toString());
Message msg = new Message();
msg.what = 1;
msg.obj = result;
handler.sendMessage(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
/**
* 使用post请求
*/
private void getDataFromPost() {
new Thread() {
@Override
public void run() {
try {
String result = post(url, "");
Log.d(TAG, "onClick: " + result.toString());
Message msg = new Message();
msg.what = POST;
msg.obj = result;
handler.sendMessage(msg);
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
OkHttpClient client = new OkHttpClient();
private String url = "http://tingapi.ting.baidu.com/v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=1&offset=0";
/**
* http://tingapi.ting.baidu.com/v1/restserver/ting?method=baidu.ting.billboard.billList&type=1&size=1&offset=0
* get请求 网络连接
*
* @param url
* @return
* @throws IOException
*/
private String get(String url) throws IOException {
Request request = new Request.Builder()
.url(url)
.build();
Response response = client.newCall(request).execute();
return response.body().string();
}
public static final MediaType JSON
= MediaType.parse("application/json; charset=utf-8");
/**
* post 请求
*
* @param url
* @return
* @throws IOException
*/
private String post(String url, String json) throws IOException {
RequestBody body = RequestBody.create(JSON, json);
Request request = new Request.Builder()
.url(url)
.post(body)
.build();
Response response = client.newCall(request).execute();
return response.body().string();
}
/**
* 使用OKHttpUtil
*/
public void getDataByUtil() {
OkHttpUtils
.post()
.url(url)
.id(100)
.build()
.execute(new MyStringCallback());
}
public class MyStringCallback extends StringCallback {
@Override
public void onBefore(Request request, int id) {
setTitle("loading...");
}
@Override
public void onAfter(int id) {
setTitle("Sample-okHttp");
}
@Override
public void onError(Call call, Exception e, int id) {
e.printStackTrace();
tv_result.setText("onError:" + e.getMessage());
}
@Override
public void onResponse(String response, int id) {
Log.e(TAG, "onResponse：complete");
tv_result.setText("onResponse:" + response);
switch (id) {
case 100:
Toast.makeText(OKHttpActivity.this, "http", Toast.LENGTH_SHORT).show();
break;
case 101:
Toast.makeText(OKHttpActivity.this, "https", Toast.LENGTH_SHORT).show();
break;
}
}
@Override
public void inProgress(float progress, long total, int id) {
Log.e(TAG, "inProgress:" + progress);
progressBar.setProgress((int) (100 * progress));
}
}
/**
* 下载大文件
*/
private void downloadFile() {
String url = "http://dl.download.csdn.net/down10/20150110/225fe49dc61fba661b2b06b27caf9e16.jar?response-content-disposition=attachment%3Bfilename%3D%22gson-2.3.1.jar%22&OSSAccessKeyId=9q6nvzoJGowBj4q1&Expires=1486181058&Signature=O6n47e7oK3JwnYl%2FaLdcXHy8KT0%3D";
OkHttpUtils
.get()
.url(url)
.build()
.execute(new FileCallBack(Environment.getExternalStorageDirectory().getAbsolutePath(),
"gson.jar") {
@Override
public void onError(Call call, Exception e, int id) {
Log.e(TAG, "onError: " + e.getMessage());
}
@Override
public void onResponse(File response, int id) {
Log.e(TAG, "onResponse: " + response.getAbsolutePath());
}
@Override
public void inProgress(float progress, long total, int id) {
progressBar.setProgress((int) (100 * progress));
}
});
}
private String address = "http://172.20.10.2:8080/FileUpload/index.jsp";
/**
* 文件上传
*/
private void fileUpload(){
File file = new File(Environment.getExternalStorageDirectory(), "gson.jar");
File file2 = new File(Environment.getExternalStorageDirectory(), "123.jpg");
if (!file.exists() || !file2.exists()) {
Toast.makeText(this, "文件不存在", Toast.LENGTH_SHORT).show();
return;
}
Map<String, String> params = new HashMap<>();
params.put("username", "haoren");
params.put("password", "123");
String mBaseUrl = "http://192.168.155.1:8080/FileUpload/FileUploadServlet";
OkHttpUtils.post()
.addFile("mFile", "gson.jar", file)
.addFile("mFile", "123.jpg", file2)
.url(mBaseUrl)
.params(params)
.build()
.execute(new MyStringCallback());
}
/**
* 请求图片
*/
private void getImg(){
tv_result.setText("");
String url = "http://images.csdn.net/20150817/1.jpg";
OkHttpUtils
.get()
.url(url)
.tag(this)
.build()
.connTimeOut(2000)
.readTimeOut(2000)
.writeTimeOut(2000)
.execute(new BitmapCallback() {
@Override
public void onError(Call call, Exception e, int id) {
tv_result.setText(e.getMessage());
}
@Override
public void onResponse(Bitmap response, int id) {
iv_icon.setImageBitmap(response);
}
});
}
}
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