Android进阶2之Http操作访问网络

操作步骤：

<1>

生成请求对象

HttpGet httpGet = new HttpGet("请求地址。。。。。");

<2>

生成客户端对象

HttpClient httpClient = new DefaultHttpClient();

<3>

执行请求

HttpResponse httpResponse = httpClient.execute(httpGet);

<4>

接受响应

HttpEntity  httpEntity = httpResponse.getEntity();

<5>得到数据流

InputStream  inputStream = httpEntity.getContent();

注意：

要添加权限： <uses-permission android:name="android.permission.INTERNET" />

具体实现：

package xiaosi.httpResponse;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

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 android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class HttpResponseActivity extends Activity
{
    private Button          button          = null;
    private TextView        text            = null;
    private HttpResponse    httpResponse    = null;
    private HttpEntity      httpEntity      = null;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        text = (TextView) findViewById(R.id.text);
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v)
            {
                // 生成一个请求对象，参数就是地址
                HttpGet httpGet = new HttpGet("http://www.baidu.com");
                // 生成Http客户端
                HttpClient httpClient = new DefaultHttpClient();
                InputStream inputStream = null;
                // 使用HTTP客户端发送请求对象
                try
                {
                    // 发送请求的响应
                    httpResponse = httpClient.execute(httpGet);
                    // 代表接收的http消息，服务器返回的消息都在httpEntity
                    httpEntity = httpResponse.getEntity();
                    if(httpResponse.getStatusLine().getStatusCode() == 200){
                        inputStream = httpEntity.getContent();
                        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                        String result = "";
                        String line = "";
                        while ((line = reader.readLine()) != null)
                        {
                            result = result + line;
                        }

                        text.setText(result);
                    }
                }
                catch (ClientProtocolException e)
                {
                    e.printStackTrace();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
                finally
                {
                    try
                    {
                        inputStream.close();
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }
                }
            }
        });
    }
}

package xiaosi.httpResponse;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

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 android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class HttpResponseActivity extends Activity
{
	private Button			button			= null;
	private TextView		text			= null;
	private HttpResponse	httpResponse	= null;
	private HttpEntity		httpEntity		= null;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		text = (TextView) findViewById(R.id.text);
		button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v)
			{
				// 生成一个请求对象，参数就是地址
				HttpGet httpGet = new HttpGet("http://www.baidu.com");
				// 生成Http客户端
				HttpClient httpClient = new DefaultHttpClient();
				InputStream inputStream = null;
				// 使用HTTP客户端发送请求对象
				try
				{
					// 发送请求的响应
					httpResponse = httpClient.execute(httpGet);
					// 代表接收的http消息，服务器返回的消息都在httpEntity
					httpEntity = httpResponse.getEntity();
					if(httpResponse.getStatusLine().getStatusCode() == 200){
						inputStream = httpEntity.getContent();
						BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
						String result = "";
						String line = "";
						while ((line = reader.readLine()) != null)
						{
							result = result + line;
						}
						
						text.setText(result);
					}
				}
				catch (ClientProtocolException e)
				{
					e.printStackTrace();
				}
				catch (Exception e)
				{
					e.printStackTrace();
				}
				finally
				{
					try
					{
						inputStream.close();
					}
					catch (IOException e)
					{
						e.printStackTrace();
					}
				}
			}
		});
	}
}