Android使用OkHttp实例，以及OkHttp方法封装
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本文在Android中使用OkHttp3实现数据的上传获取，图片的下载
一、在AndroidStudio中新建项目
二、在build.gradle中添加依赖
compile 'com.squareup.okhttp3:okhttp:3.6.0'
三、新建utils包，并在包中新建OkManager.java 类
package cc.example.com.utils;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Handler;import android.os.Looper;import org.json.JSONException;import org.json.JSONObject;import java.io.IOException;import java.util.Map;import okhttp3.Call;import okhttp3.Callback;import okhttp3.FormBody;import okhttp3.MediaType;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.RequestBody;import okhttp3.Response;/** * Created by Administrator on 2017/2/15 0015. * 封装工具类 * 这一个类主要将OkHttp3工具类进行封装，用于对数据的传输，包括Spring,Json,img，表单等数据的提交与获取 */public class OkManager { private OkHttpClient client; private volatile static OkManager manager; //防止多个线程访问时 private final String TAG = OkManager.class.getSimpleName(); //获得类名 private Handler handler; //提交json数据 private static final MediaType JSON = MediaType.parse("application/json;charset=utf-8"); //提交字符串数据 private static final MediaType MEDIA_TYPE_MARKDOWN = MediaType.parse("text/x-markdown;charset=utf-8"); private OkManager() { client = new OkHttpClient(); handler = new Handler(Looper.getMainLooper()); } //采用单例模式获取对象 public static OkManager getInstance() { OkManager instance = null; if (manager == null) { synchronized (OkManager.class) { //同步代码块 if (instance == null) { instance = new OkManager(); manager = instance; } } } return instance; } /** * 请求返回的是JSON字符串 * * @param jsonValue * @param callBack */ private void onSuccessJsonStringMethod(final String jsonValue, final Fun1 callBack) { handler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.onResponse(jsonValue); } catch (Exception e) { } } } }); } /** * 请求返回相应结果的是Json对象 * * @param jsonValue * @param callBack */ private void onSuccessJsonObjectMethod(final String jsonValue, final Fun4 callBack) { handler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.onResponse(new JSONObject(jsonValue)); } catch (JSONException e) { } } } }); } /** * 返回响应的对象是一个字节数组 * * @param data * @param callBack */ private void onSuccessByteMethod(final byte[] data, final Fun2 callBack) { handler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.onResponse(data); } catch (Exception e) { } } } }); } private void onSuccessImgMethod(final Bitmap bitmap, final Fun3 callBack) { handler.post(new Runnable() { @Override public void run() { if (callBack != null) { try { callBack.onResponse(bitmap); } catch (Exception e) { } } } }); } /** * 同步请求,在Android开发中不常用，因为会阻塞UI线程 * * @param url * @return */ public String synaGetByUrl(String url) { //构建一个Request请求 Request request = new Request.Builder().url(url).build(); Response response = null; try { response = client.newCall(request).execute(); //execute用于同步请求数据 if (response.isSuccessful()) { return response.body().string(); } } catch (Exception e) { } return null; } /** * 异步请求,请求返回Json字符串 * * @param url * @param callback */ public void asyncJsonStringByURL(String url, final Fun1 callback) { final Request request = new Request.Builder().url(url).build(); client.newCall(request).enqueue(new Callback() { //enqueue是调用了一个入队的方法 @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { onSuccessJsonStringMethod(response.body().string(), callback); } } }); } /** * 异步请求，请求返回Json对象 * * @param url * @param callback */ public void asyncJsonObjectByUrl(String url, final Fun4 callback) { final Request request = new Request.Builder().url(url).build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { onSuccessJsonObjectMethod(response.body().string(), callback); } } }); } /** * 异步请求，请求返回的byte字节数组 * * @param url * @param callback */ public void asyncGetByteByUrl(String url, final Fun2 callback) { final Request request = new Request.Builder().url(url).build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { onSuccessByteMethod(response.body().bytes(), callback); } } }); } /** * 异步请求，请求返回图片 * * @param url * @param callback */ public void asyncDownLoadImgtByUrl(String url, final Fun3 callback) { final Request request = new Request.Builder().url(url).build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { byte[] data = response.body().bytes(); Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); onSuccessImgMethod(bitmap, callback); System.out.println(data.length); } } }); } /** * 模拟表单的提交 * * @param url * @param param * @param callback */ public void sendComplexForm(String url, Map<String, String> param, final Fun4 callback) { FormBody.Builder form_builder = new FormBody.Builder(); //表单对象，包含以input开始的对象，模拟一个表单操作，以HTML表单为主 //如果键值对不为空，且值不为空 if (param != null && !param.isEmpty()) { //循环这个表单，zengqiang for循环 for (Map.Entry<String, String> entry : param.entrySet()) { form_builder.add(entry.getKey(), entry.getValue()); } } //声明一个请求对象体 RequestBody request_body = form_builder.build(); //采用post的方式进行提交 Request request = new Request.Builder().url(url).post(request_body).build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { onSuccessJsonObjectMethod(response.body().string(), callback); } } }); } /** * 向服务器提交String请求 * * @param url * @param content * @param callback */ public void sendStringByPost(String url, String content, final Fun4 callback) { Request request = new Request.Builder().url(url).post(RequestBody.create(MEDIA_TYPE_MARKDOWN, content)).build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if (response != null && response.isSuccessful()) { onSuccessJsonObjectMethod(response.body().string(), callback); } } }); } //回调 public interface Fun1 { void onResponse(String result); } interface Fun2 { void onResponse(byte[] result); } public interface Fun3 { void onResponse(Bitmap bitmap); } public interface Fun4 { void onResponse(JSONObject jsonObject); }}四、编写activity_main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/test" android:layout_width="match_parent" android:layout_height="50dp" android:text="用于获取图片" /> <ImageView android:id="@+id/testImageView" android:layout_width="match_parent" android:layout_height="100dp" /> <Button android:id="@+id/getjson" android:layout_width="match_parent" android:layout_height="50dp" android:text="获取Json数据请求" /> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="50dp" android:text="用于登录验证" /></LinearLayout>
五、编写MainActivity.java
package cc.example.com.datatransimission;import android.graphics.Bitmap;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import org.json.JSONObject;import java.io.IOException;import java.util.HashMap;import java.util.Map;import cc.example.com.utils.OkManager;import okhttp3.Call;import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;public class MainActivity extends AppCompatActivity { private Button testButton, getJsonButton, button3; private ImageView testImageView; private final static int SUCCESS_SATUS = 1; private final static int FAILURE = 0; private final static String Tag = MainActivity.class.getSimpleName(); private OkManager manager; private OkHttpClient clients; //图片下载的请求地址 private String img_path = "http://192.168.191.1:8080/OkHttp3Server/UploadDownloadServlet?method=download"; //请求返回值为Json数组 private String jsonpath = "http://192.168.191.1:8080/OkHttp3Server/ServletJson"; //登录验证请求 private String login_path="http://192.168.191.1:8080/OkHttp3Server/OkHttpLoginServlet"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); testButton = (Button) findViewById(R.id.test); getJsonButton = (Button) findViewById(R.id.getjson); testImageView = (ImageView) findViewById(R.id.testImageView); button3 = (Button) findViewById(R.id.button3); //----------------------------------------------------------------------------------------- manager = OkManager.getInstance(); getJsonButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { manager.asyncJsonStringByURL(jsonpath, new OkManager.Fun1() { @Override public void onResponse(String result) { Log.i(Tag, result); //获取JSON字符串 } }); } }); //------------------------------------------------------------------------- //用于登录请求测试，登录用户名和登录密码应该Sewrver上的对应 button3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Map<String, String> map = new HashMap<String, String>(); map.put("username", "123"); map.put("password", "123"); manager.sendComplexForm(login_path, map, new OkManager.Fun4() { @Override public void onResponse(JSONObject jsonObject) { Log.i(Tag, jsonObject.toString()); } }); } }); testButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { manager.asyncDownLoadImgtByUrl(img_path, new OkManager.Fun3() { @Override public void onResponse(Bitmap bitmap) { // testImageView.setBackgroundResource(0); testImageView.setImageBitmap(bitmap); Log.i(Tag, "231541645"); } }); } }); }}六、运行结果：
七：客户端Android源码地址：https://github.com/HankZhaoSE/OkHttp3
服务器地址：https://github.com/HankZhaoSE/OkHttp3Server
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