Android_OkHttp封装

一:定义一个接口里面有请求成功与失败的方法

public interface CallBack {
    void onSuccess(Object o);
    void onFailed(Exception e);
}

二:工具类中

package activity.example.com.httputils;

import android.os.Handler;

import com.google.gson.Gson;

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

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

/**
 * Created by 壹颗大金星 on 2017/11/9.
 */

public class HttpUtils {
    private static volatile HttpUtils instance;

    private static Handler handler = new Handler();

    private HttpUtils(){

    }
    public static HttpUtils getInstance() {
        if (instance == null) {
            synchronized (HttpUtils.class) {
                if (instance == null) {
                    instance = new HttpUtils();
                }
            }
        }
        return instance;
    }
    //get请求
    public void get(String url, Map<String,String> map, final CallBack callBack, final Class c){
        //对url和参数做拼接处理
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append(url);
        //判断是否存在?   if中是存在
        if(stringBuffer.indexOf("?")!=-1 ){
            //判断?是否在最后一位    if中是不在最后一位
            if(stringBuffer.indexOf("?")!=stringBuffer.length()-1){
                stringBuffer.append("&");
            }
        }else{
            stringBuffer.append("?");
        }
        for(Map.Entry<String,String> entry:map.entrySet()){
            stringBuffer.append(entry.getKey())
                        .append("=")
                        .append(entry.getValue())
                        .append("&");
        }
	//判断是否存在&   if中是存在
	if(stringBuffer.indexOf("&")!=-1){
        stringBuffer.deleteCharAt(stringBuffer.lastIndexOf("&"));
	}


        //1:创建OkHttpClient对象
        OkHttpClient okHttpClient = new OkHttpClient();
        //2:创建Request对象
        final Request request = new Request.Builder()
                .get()
                .url(stringBuffer.toString())
                .build();
        //3:创建Call对象
        Call call = okHttpClient.newCall(request);
        //4:请求网络
        call.enqueue(new Callback() {
            //请求失败
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        callBack.onFailed(e);
                    }
                });
            }
            //请求成功
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();
                //拿到数据解析
                final Object o = new Gson().fromJson(result, c);
                //当前是在子线程,回到主线程中
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        //回调
                        callBack.onSuccess(o);
                    }
                });
            }
        });

    }
    //post请求
    public void post(String url, Map<String,String> map, final CallBack callBack, final Class c){
        //1:创建OkHttpClient对象
        OkHttpClient okHttpClient = new OkHttpClient();
        //2:提供post请求需要的body对象
        FormBody.Builder builder = new FormBody.Builder();
        for(Map.Entry<String,String> entry:map.entrySet()){
            builder.add(entry.getKey(),entry.getValue());
        }
        FormBody body = builder.build();
        //3:创建Request对象
        final Request request = new Request.Builder()
                .post(body)
                .url(url)
                .build();
        //4:创建Call对象
        Call call = okHttpClient.newCall(request);
        //5:请求网络
        call.enqueue(new Callback() {
            //请求失败
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        callBack.onFailed(e);
                    }
                });
            }
            //请求成功
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();
                //拿到数据解析
                final Object o = new Gson().fromJson(result, c);
                //当前是在子线程,回到主线程中
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        //回调
                        callBack.onSuccess(o);
                    }
                });
            }
        });
    }

}

三:MainActivity引用

package activity.example.com.httputils;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

    private Button get;
    private TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        get = (Button)findViewById(R.id.get);
        text = (TextView)findViewById(R.id.text);
        get.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Map<String,String> map = new HashMap<String, String>();
                map.put("mobile","00000000000");
                map.put("password","123456");
                HttpUtils.getInstance().get("http://120.27.23.105/user/login", map,
                        new CallBack() {
                            @Override
                            public void onSuccess(Object o) {
                                //o请求回来的数据,已经解析完
                                final User user = (User)o;
                                //请求出来的数据展示到textview上
                                text.setText(user.getMsg());
                            }

                            @Override
                            public void onFailed(Exception e) {

                            }
                        },User.class);//最后一个参数是解析的实体类
            }
        });
    }
}