Android模仿jquery异步请求

最新推荐文章于 2021-08-05 16:29:27 发布

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本文介绍了一段使用Java实现的异步网络请求代码，通过ExecutorService管理和处理多个并发任务，并展示了如何利用Handler传递数据和回调结果。此外，还提供了WebUtil类用于获取网页内容，实现了HTTP请求的简化操作。

 
package com.xbl.task;
 
 
 
import java.io.BufferedReader;
 
import java.io.InputStream;
 
import java.io.InputStreamReader;
 
import java.net.URL;
 
import java.util.concurrent.Executor;
 
import java.util.concurrent.ExecutorService;
 
import java.util.concurrent.Executors;
 
 
 
import android.os.Bundle;
 
import android.os.Handler;
 
import android.os.Message;
 
import android.util.Log;
 
 
 
 
 
public class JQuery {
 
     
 
    private static final String KEY = "key";
 
    private static String TAG = "JQuery";
 
    private static final int N = 5;// 5个工人 
 
    private static final Executor worker = Executors.newFixedThreadPool(N);// 线程池
 
    private static final Handler handler = new Handler(){
 
        @Override
 
        public void handleMessage(Message msg) {
 
            TaskListener listener = (TaskListener)msg.obj;
 
            Object result = msg.getData();
 
            if(listener !=null ){
 
                listener.callBack(result);
 
            }
 
            destory();
 
        }
 
    };
 
     
 
    private JQuery(){      
 
    }
 
     
 
    public static void execute(final String url,final TaskListener listener){
 
        worker.execute(new Runnable() {
 
            @Override
 
            public void run() {
 
                String result = null;
 
                try {
 
                    result = WebUtil.get(url);
 
                } catch (Exception e) {
 
                    Log.e(TAG, e.getMessage());
 
                }
 
                 
 
                Message msg = new Message();
 
                Bundle data = new Bundle();
 
                data.putSerializable(KEY, result);
 
                msg.setData(data);
 
                msg.obj = listener;
 
                handler.sendMessage(msg);
 
            }
 
        });
 
    }
 
     
 
    //销毁线程
 
    private static void destory() {
 
        if (worker != null && worker instanceof ExecutorService) {
 
            ExecutorService es = (ExecutorService) worker;
 
            if (!es.isShutdown()) {
 
                es.shutdown();
 
            }
 
        }
 
    }  
 
     
 
    public interface TaskListener{
 
        public void callBack(Object result);
 
    }
 
    /**
 
     *
 
     * 不必太在意此处代码，只是示例
 
     *
 
     */
 
    public static class WebUtil{
 
         
 
        public static String get(String url) throws Exception{
 
            InputStream inputStream = new URL(url).openStream();
 
            StringBuilder strBuilder = new StringBuilder();
 
            BufferedReader reader = new BufferedReader(newInputStreamReader(inputStream));
 
            for (String s = reader.readLine(); s != null; s = reader.readLine())
 
                strBuilder.append(s);
 
             
 
            inputStream.close();
 
            return strBuilder.toString();
 
        }
 
    }
 
}

2. [代码][Java]代码

 
//调用方法：
 
JQuery.execute("http://weather.news.qq.com/inc/minisite_125.js", newJQuery.TaskListener() {               
 
                @Override
 
                public void callBack(Object result) {
 
                    TextView t = new TextView(TaskDemoActivity.this);
 
                    t.setText(String.valueOf(result));
 
                    LinearLayout layout = (LinearLayout)findViewById(R.id.layout1);
 
                    layout.addView(t);
 
                }
 
            });