OKHTTP的单例和再封装

Posted 2023-02-27 下一个丶奇迹

/**
 * Created by zm on 16-2-1
 * okhttp的再封装,对于2.x版本，3.x版本将原有对okhttpclient配置
 * 改成了builder模式配
 * 置,对于超时、代理、dns，okhttp已经做好了配置，
 * 若不需要特殊配置，可以跳过
 */
public class OkHttpUtil

    private static OkHttpClient singleton;
    //非常有必要，要不此类还是可以被new，但是无法避免反射，好恶心
    private OkHttpUtil()

    
    public static OkHttpClient getInstance() 
        if (singleton == null)
        
            synchronized (OkHttpUtil.class)
            
                if (singleton == null)
                
                    singleton = new OkHttpClient();
                
            
        
        return singleton;
    

之前在看okhttp源码的时候，发现square没有对okhttpclient进行单例，网上也没找到合适的解释，以下是自己的猜测

优点：使用单例模式，避免了多次创建所产生的垃圾
缺点：对于一些特殊需求的代码进行一些灵活的配置，单例模式难以实现
总结：做为优秀的开源框架，square出发点是让用户更好更灵活的使用和扩展，从用户角度来说，对于不需要多次配置的项目，可以手动写一个单例模式，便于内存的高效利用

/**
 * okhttp再次封装
 * Created by zm on 16-2-1
 * update by zm on 16-3-19 增加Builder，方便以后内容或者字段的扩展
 * 
 */
public class HttpTools

    private Context context;
    private final RequestParams req;
    private final Handler handler;

    public HttpTools(Builder builder)
    
        // TODO Auto-generated constructor stub
        context = builder.context;
        req = builder.req;
        handler = builder.handler;
    

    public static class Builder
    
        private final RequestParams req;
        private final Context context;
        private final Handler handler;

        public Builder(RequestParams req, Context mContext, Handler handler)
        
            // TODO Auto-generated constructor stub
            this.req = req;
            this.context = mContext;
            this.handler = handler;
        

        public HttpTools build() 
            return new HttpTools(this);
        
    

    public void requestBuilder() 
        // TODO Auto-generated method stub
        if(req==null||context==null||handler==null)
            throw new NullPointerException("NullPointerException");
        
        requestGet(req, context, handler);
    

    private static void parse(Call call, final Handler handler,
            final RequestParams req) 
        // 请求加入调度
        call.enqueue(new Callback()
        
            @Override
            public void onResponse(Call call, Response response)
                    throws IOException 
                // TODO Auto-generated method stub
                String result = response.body().string();
                if (result != null)
                
                    Message message = Message.obtain();
                    message.obj = result;
                    message.what = req.getSuccessMsgWhat();
                    handler.sendMessage(message);
                
            

            @Override
            public void onFailure(Call call, IOException e) 
                // TODO Auto-generated method stub
                handler.sendEmptyMessage(req.getFailMsgWhat());
            
        );
    

    /**
     * 
     * @param req
     * @param context
     * @param handler
     * 
     *            get请求
     */
    public static void requestGet(final RequestParams req,
            final Context context, final Handler handler) 
        // 创建一个Request
        final Request request = new Request.Builder().url(req.getRequestUrl()).build();
        Call call = OkHttpUtil.getInstance().newCall(request);
        parse(call, handler, req);
    

    /**
     * post请求
     */
    public static void requestPost(final RequestParams req,
            final Context context, final Handler handler) 
        FormBody.Builder builder = new FormBody.Builder();
        //此处是对RequestParams的遍历，RequestParams类省略
        for (Map.Entry<String, Object> mEntry : req.getParamEntry())
        
            String mEntryKey = mEntry.getKey();
            Object mEntryValue = mEntry.getValue();
            if (TextUtils.isEmpty(mEntryKey))
            
                continue;
            
            builder.add(mEntryKey, mEntryValue.toString());
        
        RequestBody body = builder.build();
        Request request = new Request.Builder().url(req.getUrl()).post(body).build();

        Call call = OkHttpUtil.getInstance().newCall(request);
        parse(call, handler, req);
    

    /**
     *            数据请求的集中管理，方便以后一键替换，从get到post
     */
    public static void request(RequestParams req, Context mContext,
            Handler handler) 
        // TODO Auto-generated method stub
        requestGet(req, mContext, handler);
    

最后再奉献上一个封装类

/**
 * 
 * Created by zm on 16-2-1
 * 基于Gson的json转model封装类
 *
 */
public class JsonToModel


private static String info = "info";

    public static String getInfo()
    
        return info;
    

    public static void setInfo(String info)
    
        JsonToModel.info = info;
    
    /**
     * 
     * @param msg
     * @param t
     *            model类
     * @param model
     *            model对象
     * @return
     */
    public static <T> List<T> getJsonArrayToModel(Message msg, Class<T> t,
            T model) 
        // TODO Auto-generated method stub
        List<T> list = new ArrayList<T>();
        try 
            JSONObject json = new JSONObject(msg.obj.toString());
            for (int i = 0; i < json.getJSONArray(getInfo()).length(); i++) 
                model = GsonHelper.toType(json.getJSONArray(getInfo()).get(i).toString(), t);
                list.add(model);
            
            return list;
         catch (Exception e) 
            // TODO Auto-generated catch block
            Log.e("getJsonArrayToModel", "error");
            e.printStackTrace();
        
        return null;
    

json转model的这个类中，当时没考虑到过多性能的问题，在此类中即使用了org.json.JSONObject也使用了gson，此处还可以做出相应的优化