Android 利用AsyncTask異步請求站點。

前邊有一篇使用get和post方式請求站點的文章，此篇使用異步方式請求：

同時解決了android 4.0以後的主線程不能訪問網絡的問題。

簡寫了代碼和記錄以防忘記備查：

自己編寫了GetOrPost類繼承了AsyncTask 全部代碼如下：

package ytbk.soft.getorpost;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;

public class GetOrPost extends AsyncTask<String, Integer,String>
{
	//要請求的網站地址
	private String baseUrl="http://192.168.10.86:8080/service/indexService";
	//客戶端
	private HttpClient client=null;
	//請求參數或者返回實體
	private HttpEntity entity=null;
	//post請求
	private HttpPost post=null;
	//get請求
	private HttpGet get=null;
	//返回值
	private HttpResponse response=null;
	//流對象
	private InputStream stream=null;
	
	private String getResult()
	{
		try {
			BufferedReader reder=new BufferedReader(new InputStreamReader(stream));
			
			String result="";
			String line="";
			while((line=reder.readLine())!=null)
			{
				result=result+line;
			}
			
			return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return "";
	}
	
	@Override
	protected String doInBackground(String... params) 
	{
		String name=params[0];
		String age=params[1];
		
		try 
		{	
			if (params[2].toString().trim().equals("get"))
			{
				String Url=baseUrl+"?name="+name+"&age="+age;
				get=new HttpGet(Url);
				client=new DefaultHttpClient();
				response=client.execute(get);
			}
			if (params[2].toString().trim().equals("post"))
			{
				NameValuePair namevalue=new BasicNameValuePair("name1",name);
				NameValuePair agevalue=new BasicNameValuePair("age1",age);
				List<NameValuePair> list=new ArrayList<NameValuePair>();
				list.add(namevalue);
				list.add(agevalue);
				
				HttpEntity entity=new UrlEncodedFormEntity(list);
				HttpPost post=new HttpPost(baseUrl);
				post.setEntity(entity);
				HttpClient client=new DefaultHttpClient();
				response=client.execute(post);
			}
			
			entity=response.getEntity();
			stream=entity.getContent();
			
			return getResult();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return "";
	}

	@Override
	protected void onPostExecute(String result) {
		// TODO Auto-generated method stub
		//打印請求數據
		System.out.println(result);
		super.onPostExecute(result);
	}
}

住UI全部代碼：

package ytbk.soft.activity;

import ytbk.soft.getorpost.GetOrPost;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity 
{

	private Button getButton = null;
	private Button postButton=null;
	private EditText name=null;
	private EditText age=null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.mainactivity);
		
		
		
		getButton=(Button)this.findViewById(R.id.getButton);
		postButton=(Button)this.findViewById(R.id.postButton);
		name=(EditText)this.findViewById(R.id.name);
		age=(EditText)this.findViewById(R.id.age);
		
		getButton.setOnClickListener(new OnClickListener() 
		{
			@Override
			public void onClick(View v) 
			{
				String sname=name.getText().toString();
				String sage=age.getText().toString();
				
				GetOrPost post=new GetOrPost();
				post.execute(sname,sage,"get");
			}
		});
		
		
		postButton.setOnClickListener(new OnClickListener() 
		{
			@Override
			public void onClick(View v) 
			{
				String sname=name.getText().toString();
				String sage=age.getText().toString();
				
				GetOrPost post=new GetOrPost();
				post.execute(sname,sage,"post");
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}