HttpClientGetActivity

最新推荐文章于 2019-07-08 17:30:44 发布

原创最新推荐文章于 2019-07-08 17:30:44 发布 · 351 阅读

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本文介绍了一个使用Java的HttpClient库来从网络获取数据的例子。通过创建一个简单的Android应用，我们展示了如何设置HTTP请求参数，执行GET请求，并将返回的数据展示在界面上。

package com.example.homework6.internet;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;

import com.example.homework6.R;
import com.example.homework6.R.id;
import com.example.homework6.R.layout;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;

public class HttpClientGetActivity extends Activity {

   private TextView textView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       // TODO Auto-generated method stub
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       textView=(TextView) findViewById(R.id.tv_title);
       MyThread myThread=new MyThread();
       myThread.start();
   }
   Handler hander =new Handler(){
       @Override
       public void handleMessage(Message msg) {
           String a=(String) msg.obj;
           textView.setText(a);
       }
   };
   class MyThread extends Thread{
       private String string;

       @Override
       public void run() {
           HttpGet httpGet=new HttpGet("http://apis.juhe.cn/cook/query?key=a8cceb02be610927c66a843b6b1421d0&"
                   + "menu=西红柿&rn=10&pn=3");
           HttpParams httpParams=new BasicHttpParams();
           HttpConnectionParams.setConnectionTimeout(httpParams, 5000);
           HttpConnectionParams.setSoTimeout(httpParams, 5000);
           HttpClient httpClient=new DefaultHttpClient();
           HttpResponse httpResponse;
           try {
               httpResponse = httpClient.execute(httpGet);
               if (httpResponse.getStatusLine().getStatusCode()==200) {
                   HttpEntity httpEntity=httpResponse.getEntity();
                   string = EntityUtils.toString(httpEntity,"utf-8");
               }
               Message message=Message.obtain();
               message.obj=string;
               hander.sendMessage(message);
           } catch (ClientProtocolException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }

       }
   }
}