Android -- OkHttp的简单使用和封装

OkHttp的封装

由于是封装我们可以吧OKHttp和Gson给结合起来，那么我们在gradle文件添加以下的依赖

1 2 3

compile "com.squareup.okhttp:okhttp:2.4.0" compile 'com.squareup.okio:okio:1.5.0' compile "com.google.code.gson:gson:2.8.0"

　　①CallBack的创建　　

　　首选我们知道，当接口请求成功或者失败的时候我们需要将这个信息通知给用户，那么我们就需要创建一个抽象类RequestCallBack，请求前、成功、失败、请求后这几个方法，创建OnBefore（）、OnAfter（）、OnError（）、OnResponse（）对应

　　

/**
 * 在请求之前的方法，一般用于加载框展示
 *
 * @param request
 */
public void onBefore(Request request) {
}

/**
 * 在请求之后的方法，一般用于加载框隐藏
 */
public void onAfter() {
}

/**
 * 请求失败的时候
 *
 * @param request
 * @param e
 */
public abstract void onError(Request request, Exception e);

/**
 *
 * @param response
 */
public abstract void onResponse(T response);

　由于我们每次想要的数据不一定，所以这里我们用<T>来接收想要装成的数据格式，并通过反射得到想要的数据类型（一般是Bean、List）之类　，所以RequestCallBack的整体代码如下：

package com.qianmo.httprequest.http;

import com.google.gson.internal.$Gson$Types;
import com.squareup.okhttp.Request;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;


/**
 * Created by wangjitao on 15/10/16.
 * 抽象类，用于请求成功后的回调
 */
public abstract class ResultCallback<T> {
    //这是请求数据的返回类型，包含常见的（Bean，List等）
    Type mType;

    public ResultCallback() {
        mType = getSuperclassTypeParameter(getClass());
    }

    /**
     * 通过反射想要的返回类型
     *
     * @param subclass
     * @return
     */
    static Type getSuperclassTypeParameter(Class<?> subclass) {
        Type superclass = subclass.getGenericSuperclass();
        if (superclass instanceof Class) {
            throw new RuntimeException("Missing type parameter.");
        }
        ParameterizedType parameterized = (ParameterizedType) superclass;
        return $Gson$Types.canonicalize(parameterized.getActualTypeArguments()[0]);
    }

    /**
     * 在请求之前的方法，一般用于加载框展示
     *
     * @param request
     */
    public void onBefore(Request request) {
    }

    /**
     * 在请求之后的方法，一般用于加载框隐藏
     */
    public void onAfter() {
    }

    /**
     * 请求失败的时候
     *
     * @param request
     * @param e
     */
    public abstract void onError(Request request, Exception e);

    /**
     *
     * @param response
     */
    public abstract void onResponse(T response);
}

　　②对Get、Post方法的简单封装　

　　首先我们创建一个OkHttpClientManager类，由于是管理类，所以，单例加静态对象搞起

private static OkHttpClientManager mInstance;

 public static OkHttpClientManager getInstance() {
       if (mInstance == null){
           synchronized (OkHttpClientManager.class) {
               if (mInstance == null) {
                   mInstance = new OkHttpClientManager();
               }
           }
       }
       return mInstance;
   }

　在创建Manager对象的时候我们要把OkHttp的一些参数配置一下，顺便一提一下，由于我们我们异步get、post方法是运行在子线程中，所以这里我们添加了分发的 Handler mDelivery;，重写的OkHttpClientManager构造方法如下：

private OkHttpClientManager() {
       mOkHttpClient = new OkHttpClient();
       mOkHttpClient.setConnectTimeout(10, TimeUnit.SECONDS);
       mOkHttpClient.setWriteTimeout(10, TimeUnit.SECONDS);
       mOkHttpClient.setReadTimeout(30, TimeUnit.SECONDS);
       //cookie enabled
       mOkHttpClient.setCookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER));
       mDelivery = new Handler(Looper.getMainLooper());
       mGson = new Gson();
   }

　　前面的外部调用对象封装好了，这里我们开始来封装Get或Post方法，我这里以Post方法为例子，首先分析一下，post方法会有几个参数，参数一url，参数二参数params，参数三Callback（及我们上面的RequestCallBack）参数四flag（用于取消请求操作，可为空），基础代码如下：

/**
        * 通用基础的异步的post请求
        * @param url
        * @param callback
        * @param tag
        */
       public void postAsyn(String url, Param[] params, final ResultCallback callback, Object tag) {
           Request request = buildPostFormRequest(url, params, tag);
           deliveryResult(callback, request);
       }

　　那么我们再看一下deliveryResult方法到底是干什么的

/**
    * 请求回调处理方法并传递返回值
    * @param callback Map类型请求参数
    * @param request Request请求
    */
   private void deliveryResult(ResultCallback callback, Request request) {
       if (callback == null)
           callback = DEFAULT_RESULT_CALLBACK;
       final ResultCallback resCallBack = callback;
       //UI thread
       callback.onBefore(request);
       mOkHttpClient.newCall(request).enqueue(new Callback() {
           @Override
           public void onFailure(final Request request, final IOException e) {
               sendFailedStringCallback(request, e, resCallBack);
           }

           @Override
           public void onResponse(final Response response) {
               try {
                   final String responseMessage=response.message();
                   final String responseBody = response.body().string();
                   if(response.code()==200){
                       if (resCallBack.mType == String.class) {
                           sendSuccessResultCallback(responseBody, resCallBack);
                       } else {
                           Object o = mGson.fromJson(responseBody, resCallBack.mType);
                           sendSuccessResultCallback(o, resCallBack);
                       }
                   }else{
                       Exception exception=new Exception(response.code()+":"+responseMessage);
                       sendFailedStringCallback(response.request(), exception, resCallBack);
                   }
               } catch (IOException e) {
                   sendFailedStringCallback(response.request(), e, resCallBack);
               } catch (com.google.gson.JsonParseException e) { //Json解析的错误
                   sendFailedStringCallback(response.request(), e, resCallBack);
               }
           }
       });
   }

　　可以看到，这个方法主要是发出请求并对请求后的数据开始回调，这样我们就基本上封装好了一个post方法了  ，把代码这一部分的代码贴出来看看

public class OkHttpClientManager {
    private static final String TAG = "com.qianmo.httprequest.http.OkHttpClientManager";

    private static OkHttpClientManager mInstance;
    //默认的请求回调类
    private final ResultCallback<String> DEFAULT_RESULT_CALLBACK = new ResultCallback<String>(){
        @Override
        public void onError(Request request, Exception e) {}

        @Override
        public void onResponse(String response) {}
    };
    private OkHttpClient mOkHttpClient;
    private Handler mDelivery;
    private Gson mGson;
    private GetDelegate mGetDelegate = new GetDelegate();
    private PostDelegate mPostDelegate = new PostDelegate();
    private DownloadDelegate mDownloadDelegate = new DownloadDelegate();

    private OkHttpClientManager() {
        mOkHttpClient = new OkHttpClient();
        mOkHttpClient.setConnectTimeout(10, TimeUnit.SECONDS);
        mOkHttpClient.setWriteTimeout(10, TimeUnit.SECONDS);
        mOkHttpClient.setReadTimeout(30, TimeUnit.SECONDS);
        //cookie enabled
        mOkHttpClient.setCookieHandler(new CookieManager(null, CookiePolicy.ACCEPT_ORIGINAL_SERVER));
        mDelivery = new Handler(Looper.getMainLooper());
        mGson = new Gson();
    }

    public static OkHttpClientManager getInstance() {
        if (mInstance == null){
            synchronized (OkHttpClientManager.class) {
                if (mInstance == null) {
                    mInstance = new OkHttpClientManager();
                }
            }
        }
        return mInstance;
    }

    /**
     * 外部可调用的Post异步请求方法
     * @param url 请求url
     * @param params
     * @param callback 请求完成后回调类
     */
    public static void postAsyn(String url, Map<String, String> params, final ResultCallback callback) {
        getInstance().getPostDelegate().postAsyn(url, params, callback, null);
    }

    /**
         * 异步的post请求
         * @param url
         * @param params
         * @param callback
         * @param tag
         */
        public void postAsyn(String url, Map<String, String> params, final ResultCallback callback, Object tag) {
            Param[] paramsArr = map2Params(params);
            postAsyn(url, paramsArr, callback, tag);
        }
    /**
         * 通用基础的异步的post请求
         * @param url
         * @param callback
         * @param tag
         */
        public void postAsyn(String url, Param[] params, final ResultCallback callback, Object tag) {
            Request request = buildPostFormRequest(url, params, tag);
            deliveryResult(callback, request);
        }

    /**
     * 请求回调处理方法并传递返回值
     * @param callback Map类型请求参数
     * @param request Request请求
     */
    private void deliveryResult(ResultCallback callback, Request request) {
        if (callback == null)
            callback = DEFAULT_RESULT_CALLBACK;
        final ResultCallback resCallBack = callback;
        //UI thread
        callback.onBefore(request);
        mOkHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(final Request request, final IOException e) {
                sendFailedStringCallback(request, e, resCallBack);
            }

            @Override
            public void onResponse(final Response response) {
                try {
                    final String responseMessage=response.message();
                    final String responseBody = response.body().string();
                    if(response.code()==200){
                        if (resCallBack.mType == String.class) {
                            sendSuccessResultCallback(responseBody, resCallBack);
                        } else {
                            Object o = mGson.fromJson(responseBody, resCallBack.mType);
                            sendSuccessResultCallback(o, resCallBack);
                        }
                    }else{
                        Exception exception=new Exception(response.code()+":"+responseMessage);
                        sendFailedStringCallback(response.request(), exception, resCallBack);
                    }
                } catch (IOException e) {
                    sendFailedStringCallback(response.request(), e, resCallBack);
                } catch (com.google.gson.JsonParseException e) { //Json解析的错误
                    sendFailedStringCallback(response.request(), e, resCallBack);
                }
            }
        });
    }
     /**
     * 处理请求成功的回调信息方法
     * @param object 服务器响应信息
     * @param callback 回调类
     */
    private void sendSuccessResultCallback(final Object object, final      ResultCallback callback) {
        mDelivery.post(() -> {
            callback.onResponse(object);
            callback.onAfter();
        });
    }
}

　　这样我们就把Post方法封装好了，同理Get方法，ok，现在我们可以来调用调用了，在调用之前我们可以对返回数据格式再来封装封装，一般我们后台返回的数据格式是类似如下：

{
 "code": 200,
  "data": {},
 "message": "登录成功"
}

　而data中有可能是对象，也有可能是数组，所以我们用两个类来实现一下

　CommonResultBean

package com.qianmo.httprequest.bean;

/**
 * 服务端返回通用接收实体
 * Created by wangjitao on 15/10/30.
 */
public class CommonResultBean<T> {
    private String code;
    private T data;
    private String message;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

　CommonResultListBean

package com.qianmo.httprequest.bean;

import java.util.List;

/**
 * 服务端返回带有List数据的通用接收实体
 * Created by wangjitao on 15/12/1.
 */
public class CommonResultListBean<T> {
    private String code;
    private List<T> data;
    private String message;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public List<T> getData() {
        return data;
    }

    public void setData(List<T> data) {
        this.data = data;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

　　ok，现在还是以上面我们登录的接口为例子开始我们的方法调用，返回的数据格式如图所示

　　我们创建UserMenu.java类

package com.qianmo.httprequest.bean;

import java.util.List;

/**
 * Created by wangjitao on 2016/12/21 0021.
 * E-Mail：[email protected]
 * 用户菜单权限按钮
 */
public class UserMenu {

    /**
     * last_login_time : 2016-12-21 15:40:28
     * member_id : 1
     * modules : []
     * phone : 18900532225
     * real_name : 超级管理员
     * role : {"role_id":1,"role_name":"超级管理员"}
     * username : superadmin
     */

    private String last_login_time;
    private int member_id;
    private String phone;
    private String real_name;
    /**
     * role_id : 1
     * role_name : 超级管理员
     */

    private RoleBean role;
    private String username;
    /**
     * module_code : 100
     * module_id : 1
     * module_name : 首页
     * pid : 0
     * type : 1
     * value : P_index
     */

    private List<ModulesBean> modules;

    public String getLast_login_time() {
        return last_login_time;
    }

    public void setLast_login_time(String last_login_time) {
        this.last_login_time = last_login_time;
    }

    public int getMember_id() {
        return member_id;
    }

    public void setMember_id(int member_id) {
        this.member_id = member_id;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getReal_name() {
        return real_name;
    }

    public void setReal_name(String real_name) {
        this.real_name = real_name;
    }

    public RoleBean getRole() {
        return role;
    }

    public void setRole(RoleBean role) {
        this.role = role;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public List<ModulesBean> getModules() {
        return modules;
    }

    public void setModules(List<ModulesBean> modules) {
        this.modules = modules;
    }

    public static class RoleBean {
        private int role_id;
        private String role_name;

        public int getRole_id() {
            return role_id;
        }

        public void setRole_id(int role_id) {
            this.role_id = role_id;
        }

        public String getRole_name() {
            return role_name;
        }

        public void setRole_name(String role_name) {
            this.role_name = role_name;
        }
    }

    public static class ModulesBean {
        private String module_code;
        private int module_id;
        private String module_name;
        private int pid;
        private int type;
        private String value;

        public String getModule_code() {
            return module_code;
        }

        public void setModule_code(String module_code) {
            this.module_code = module_code;
        }

        public int getModule_id() {
            return module_id;
        }

        public void setModule_id(int module_id) {
            this.module_id = module_id;
        }

        public String getModule_name() {
            return module_name;
        }

        public void setModule_name(String module_name) {
            this.module_name = module_name;
        }

        public int getPid() {
            return pid;
        }

        public void setPid(int pid) {
            this.pid = pid;
        }

        public int getType() {
            return type;
        }

        public void setType(int type) {
            this.type = type;
        }

        public String getValue() {
            return value;
        }

        public void setValue(String value) {
            this.value = value;
        }
    }

}

　　所以MainActivity代码如下：

package com.qianmo.httprequest;

import android.os.Environment;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.qianmo.httprequest.bean.CommonResultBean;
import com.qianmo.httprequest.bean.UserMenu;
import com.qianmo.httprequest.http.IRequestCallBack;
import com.qianmo.httprequest.http.IRequestManager;
import com.qianmo.httprequest.http.OkHttpClientManager;
import com.qianmo.httprequest.http.RequestFactory;
import com.qianmo.httprequest.http.ResultCallback;
import com.squareup.okhttp.Call;
import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


public class MainActivity extends AppCompatActivity implements OnClickListener {
    private Handler handler;
    private TextView tv_message;
    private Button btn_login;
    private ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_message = (TextView) findViewById(R.id.tv_message);
        btn_login = (Button) findViewById(R.id.btn_login);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
        handler = new Handler();
        btn_login.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        progressBar.setVisibility(View.VISIBLE);


        String url = "http://192.168.1.123:8081/api/login";
        Map<String, String> params = new HashMap();
        params.put("username", "superadmin");
        params.put("pwd", "ba3253876aed6bc22d4a6ff53d8406c6ad864195ed144ab5c87621b6c233b548baeae6956df346ec8c17f5ea10f35ee3cbc514797ed7ddd3145464e2a0bab413");
        OkHttpClientManager.postAsyn(url, params,
                new ResultCallback<CommonResultBean<UserMenu>>() {
                    @Override
                    public void onError(Request request, Exception e) {

                    }

                    @Override
                    public void onResponse(CommonResultBean<UserMenu> response) {
                        if (response.getData() != null) {
                            UserMenu userMenu = response.getData();
                            tv_message.setText(userMenu.getReal_name());
                            progressBar.setVisibility(View.GONE);
                        }
                    }
                });

    }
}

　　这样我们就可以简单的调用了，最后看一下我们的效果：

　See You Next Time···