安卓网络请求只Get和Post

于 2015-01-09 17:50:52 发布
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分类专栏： android 文章标签： android
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本文链接：https://blog.youkuaiyun.com/u010335298/article/details/42557781
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这篇博客详细介绍了在Android中使用apache httpClient进行GET和POST网络请求的方法。首先需要在AndroidManifest.xml中添加INTERNET权限。对于GET请求，创建HttpClient实例，执行HttpGet并获取响应内容。对于POST请求，同样初始化HttpClient，使用HttpPost，设置UrlEncodedFormEntity作为请求体，执行请求并获取响应内容。

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用的是apache httpClient：

首先，记得在AndroidManifest.xml中添加网络请求的权限：

 <uses-permission android:name="android.permission.INTERNET"></uses-permission>

get请求：

1.HttpClient client = new DefaultHttpClient();    

2.HttpGet get = new HttpGet(url); 

3.HttpResponse response = client.execute(get);

4.HttpEntity entity = response.getEntity();

5.InputStream inputStream = entity.getContent();

代码如下：

package com.example.httpgettest;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;

import org.apache.http.*;
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.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.TextureView;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
	
	private TextView textView;
	private Button button;
	private String resultString = "";
	private String urlString ;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		textView = (TextView)findViewById(R.id.text_view);
		button = (Button)findViewById(R.id.button);
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Down down = new Down();
				urlString = "http://www.baidu.com";
				down.execute(urlString);
			}
		});		
	}

	@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;
	}
	
	class Down extends AsyncTask<String, Integer, String>{

		@Override
		protected String doInBackground(String... params) {
			// TODO Auto-generated method stub
			
				try {
					HttpClient client = new DefaultHttpClient();    
	                HttpGet get = new HttpGet(params[0]);    
	                HttpResponse response = client.execute(get);
					if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {    
	                    HttpEntity entity = response.getEntity();    
	                    InputStream inputStream = entity.getContent();
	                    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
	                    BufferedReader in = new BufferedReader(inputStreamReader);  
	                    String inputLine="";	                    
	                    while((inputLine=in.readLine())!=null){
	                        resultString+=inputLine+"\n";
	                    }
	                    return resultString;  
	                }
				} catch (ClientProtocolException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}    			
			return null;
		}

		@Override
		protected void onPostExecute(String result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);			
			textView.setText(result);
		}
		//onPreExecute方法用于在执行后台任务前做一些UI操作    
        @Override    
        protected void onPreExecute() {      
            textView.setText("loading...");    
        }  
		
	}

}



<span style="font-family:Microsoft YaHei;"><?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.httpgettest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-permission android:name="android.permission.INTERNET"></uses-permission>
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
</span>
<span style="font-family:Microsoft YaHei;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="httpGet"></Button>
    <TextView android:id="@+id/text_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/button"
        android:textSize="20sp"
        android:textColor="@android:color/darker_gray"
        android:scrollbars="vertical"/>

</RelativeLayout>
</span>

post请求：

1.HttpClient httpClient = new DefaultHttpClient();

2.HttpPost httpPost = new HttpPost(url);

3.List<NameValuePair>HttpEntity httpEntity = new UrlEncodedFormEntity(entityList);    entityList = new ArrayList<NameValuePair>();

4.httpPost.setEntity(httpEntity);

5.HttpResponse response = httpClient.execute(httpPost);

6.InputStream inputStream = response.getEntity().getContent();

代码如下：

<span style="font-family:Microsoft YaHei;">package com.example.httpposttest;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
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.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.DefaultClientConnection;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;

public class MainActivity extends Activity {
	private Button button;
	private TextView textView;
	private ProgressBar progressBar;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		button = (Button)findViewById(R.id.button);
		textView = (TextView)findViewById(R.id.text_view);
		progressBar = (ProgressBar)findViewById(R.id.progress_bar);
		
		button.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				HttpPostAsy post = new HttpPostAsy();
				post.execute("http://www.baidu.com");
				
			}
		});
	}
	
	class HttpPostAsy extends AsyncTask<String, Integer, String>{

		@Override
		protected void onProgressUpdate(Integer... values) {
			// TODO Auto-generated method stub
			super.onProgressUpdate(values);
			if(values[0] == 100){
				progressBar.setVisibility(View.GONE);
			}else {
				progressBar.setProgress(values[0]);
			}			
		}

		@Override
		protected void onPreExecute() {
			// TODO Auto-generated method stub
			super.onPreExecute();
			textView.setText("loading...");
		}

		@Override
		protected void onPostExecute(String result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
			textView.setText(result);
		}

		@Override
		protected String doInBackground(String... params) {
			// TODO Auto-generated method stub
			HttpClient httpClient = new DefaultHttpClient();
			HttpPost httpPost = new HttpPost(params[0]);
			List<NameValuePair> entityList = new ArrayList<NameValuePair>();
//			entityList.add( new BasicNameValuePair("username", ""));
			try {
				HttpEntity httpEntity = new UrlEncodedFormEntity(entityList);
				httpPost.setEntity(httpEntity);
				HttpResponse response = httpClient.execute(httpPost);
				
				if (null == response)
		        {
		            return "null";
		        }
				long totallength = response.getEntity().getContentLength();
				InputStream inputStream = response.getEntity().getContent();
				
				String filePath = null;  
			    boolean hasSDCard = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);  
			    if (hasSDCard) {  
			    	System.out.println("*do not have sd card*");
			        filePath = Environment.getExternalStorageDirectory().toString() + File.separator + "a.txt";  
			    } else  {
			    	filePath = Environment.getDownloadCacheDirectory().toString() + File.separator + "a.txt";
			    }				
				
				File file = new File(filePath);
				if(!file.exists()){
					System.out.println("*file not exist*");
					File pFile = file.getParentFile();
					pFile.mkdirs();
					file.createNewFile();
				}				
				ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
				FileOutputStream fileOutputStream = new FileOutputStream(file);
				byte[] buffer = new byte[1024];
	            String result = "";
	            String line = "";
	            int count = 0;
	            int length = -1;    
	            while ((length=inputStream.read(buffer))!=-1)
	            {
	            	byteArrayOutputStream.write(buffer, 0, length);
	            	fileOutputStream.write(buffer);
	            	count = count +length;
	            	publishProgress((int) ((count / (float) totallength) * 100));  
	                for (int i = 0; i < buffer.length; i++) {
						result = result + buffer[i];
					}
	            }
	            return result;
			} catch (UnsupportedEncodingException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (ClientProtocolException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			return "null";
		}
		
	}


	@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;
	}

}
</span>

 
<span style="font-family:Microsoft YaHei;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="httpPost"/>
    <ProgressBar android:id="@+id/progress_bar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/button"
        style="?android:attr/progressBarStyleHorizontal" />
    <ScrollView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/progress_bar">
         <TextView android:id="@+id/text_view"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    </ScrollView>
   

</RelativeLayout>
</span>


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