Android开发之HTTP访问网络

2022-06-06 08:14

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本文实例为大家详细介绍了Android开发之HTTP访问网络的相关代码，供大家参考，具体内容如下

代码1：


package com.ywhttpurlconnection;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class YwhttpurlconnectionActivity extends Activity {
 
 private Button btn1 = null; 
 private Button btn2 = null; 
 private Button btn3 = null; 
 private Button btn4 = null; 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  //直接获取数据
  btn1 = (Button) this.findViewById(R.id.Button01); 
  //GET方式传递
  btn2 = (Button) this.findViewById(R.id.Button02); 
  //POST方式传递
  btn3 = (Button) this.findViewById(R.id.Button03);
  //获取图片
  btn4 = (Button) this.findViewById(R.id.Button04);
  btn1.setOnClickListener(new Button.OnClickListener(){ 
   public void onClick(View v) { 
    // TODO Auto-generated method stub 
    Intent intent = new Intent(); 
    intent.setClass(YwhttpurlconnectionActivity.this, showdata.class); 
    Bundle b = new Bundle(); 
    b.putInt("id", 1); 
    intent.putExtras(b); 
    startActivity(intent); 
   } 
  }); 
  btn2.setOnClickListener(new Button.OnClickListener(){ 
   public void onClick(View v) { 
    // TODO Auto-generated method stub 
    Intent intent = new Intent(); 
    intent.setClass(YwhttpurlconnectionActivity.this, showdata.class); 
    Bundle b = new Bundle(); 
    b.putInt("id", 2); 
    intent.putExtras(b); 
    startActivity(intent); 
   } 
  }); 
  btn3.setOnClickListener(new Button.OnClickListener(){ 
   public void onClick(View v) { 
    // TODO Auto-generated method stub 
    Intent intent = new Intent(); 
    intent.setClass(YwhttpurlconnectionActivity.this, showdata.class); 
    Bundle b = new Bundle(); 
    b.putInt("id", 3); 
    intent.putExtras(b); 
    startActivity(intent); 
   } 
  }); 
  btn4.setOnClickListener(new Button.OnClickListener(){ 
   public void onClick(View v) { 
    // TODO Auto-generated method stub 
    Intent intent = new Intent(); 
    intent.setClass(YwhttpurlconnectionActivity.this, showdata.class); 
    Bundle b = new Bundle(); 
    b.putInt("id", 4); 
    intent.putExtras(b); 
    startActivity(intent); 
   } 
  }); 
 } 
}

代码2：


package com.ywhttpurlconnection;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;
public class showdata extends Activity { 
 private TextView tv = null; 
 private ImageView iv = null; 
 private Bitmap mBitmap = null; 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.http); 
  Intent intent = this.getIntent(); 
  Bundle b = intent.getExtras(); 
  int id = b.getInt("id"); 
  tv = (TextView) this.findViewById(R.id.TextView_HTTP); 
  iv = (ImageView) this.findViewById(R.id.ImageView01); 
  //直接获取数据
  if (id == 1) { 
//   String httpUrl = "http://192.168.0.132:8080/Android/http.jsp"; 
   String httpUrl = "http://www.jb-aptech.com.cn";
   URL url = null; 
   try { 
    url = new URL(httpUrl); 
   } catch (MalformedURLException e) { 
    e.printStackTrace(); 
   } 
   if (url != null) { 
    try { 
     // 打开连接，此处只是创建一个实例，并没有真正的连接 
     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
     // 连接 
     urlConn.connect();
     InputStream input = urlConn.getInputStream(); 
     InputStreamReader inputReader = new InputStreamReader(input); 
     BufferedReader reader = new BufferedReader(inputReader); 
     String inputLine = null; 
     StringBuffer sb = new StringBuffer(); 
     while ((inputLine = reader.readLine()) != null) { 
      sb.append(inputLine).append("\n"); 
     } 
     reader.close(); 
     inputReader.close(); 
     input.close(); 
     urlConn.disconnect(); 
     if(sb !=null){ 
      tv.setText(sb.toString()); 
     }else{ 
      tv.setText("读取的内容:NULL"); 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
   }else{ 
    Log.i("TAG", "url is null"); 
   } 
  }else if(id==2){ 
   //GET方式传递
//   String httpUrl = "http://192.168.0.132:8080/Android/httpreq.jsp?par=hk"; 
   String httpUrl = "http://liveat.acewill.cn/liveat/?cmd=1&uid=xiaoming"; 
   URL url = null; 
   try { 
    url = new URL(httpUrl); 
   } catch (MalformedURLException e) { 
    e.printStackTrace(); 
   } 
   if (url != null) { 
    try { 
     HttpURLConnection urlConn = (HttpURLConnection) url 
       .openConnection();// 打开连接，此处只是创建一个实力，并没有真正的连接 
     urlConn.setDoInput(true); 
     urlConn.setDoOutput(true); 
     urlConn.connect();// 连接 
     InputStream input = urlConn.getInputStream(); 
     InputStreamReader inputReader = new InputStreamReader(input); 
     BufferedReader reader = new BufferedReader(inputReader); 
     String inputLine = null; 
     StringBuffer sb = new StringBuffer(); 
     while ((inputLine = reader.readLine()) != null) { 
      sb.append(inputLine).append("\n"); 
     } 
     reader.close(); 
     inputReader.close(); 
     input.close(); 
     urlConn.disconnect(); 
     if(sb !=null){ 
      tv.setText(sb.toString()); 
     }else{ 
      tv.setText("读取的内容:NULL"); 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
   }else{ 
    Log.i("TAG", "url is null"); 
   } 
  }else if(id==3){ 
   //POST方式传递
//   String httpUrl = "http://192.168.0.132:8080/Android/httpreq.jsp"; 
   String httpUrl = "http://www.jb-aptech.com.cn"; 
   URL url = null; 
   try { 
    url = new URL(httpUrl); 
   } catch (MalformedURLException e) { 
    e.printStackTrace(); 
   } 
   if (url != null) { 
    try { 
     HttpURLConnection urlConn = (HttpURLConnection) url 
       .openConnection();// 打开连接，此处只是创建一个实例，并没有真正的连接 
     urlConn.setDoInput(true); 
     urlConn.setDoOutput(true); 
     urlConn.setRequestMethod("POST"); 
     urlConn.setUseCaches(false);//post请求不能使用缓存. 
     urlConn.setInstanceFollowRedirects(true);//是否自动重定向. 
     urlConn.connect();// 连接 
     OutputStream out = urlConn.getOutputStream(); 
     DataOutputStream data = new DataOutputStream(out); 
     data.writeBytes("par="+URLEncoder.encode("hk", "GBK")); 
     data.flush(); 
     data.close(); 
     out.close(); 
     InputStream input = urlConn.getInputStream(); 
     InputStreamReader inputReader = new InputStreamReader(input); 
     BufferedReader reader = new BufferedReader(inputReader); 
     String inputLine = null; 
     StringBuffer sb = new StringBuffer(); 
     while ((inputLine = reader.readLine()) != null) { 
      sb.append(inputLine).append("\n"); 
     } 
     reader.close(); 
     inputReader.close(); 
     input.close(); 
     urlConn.disconnect(); 
     if(sb !=null){ 
      tv.setText(sb.toString()); 
     }else{ 
      tv.setText("读取的内容:NULL"); 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
   }else{ 
    Log.i("TAG", "url is null"); 
   } 
  }else if(id==4){ 
   String httpUrl = "http://www.google.com.hk/intl/zh-CN/images/logo_cn.gif"; 
   URL url = null; 
   try { 
    url = new URL(httpUrl); 
   } catch (MalformedURLException e) { 
    e.printStackTrace(); 
   } 
   if (url != null) { 
    try { 
     // 打开连接，此处只是创建一个实例，并没有真正的连接 
     HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
     urlConn.connect();// 连接 
     InputStream input = urlConn.getInputStream(); 
     mBitmap = BitmapFactory.decodeStream(input); 
     if(mBitmap != null){ 
      iv.setImageBitmap(mBitmap); 
     } 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
   }else{ 
    Log.i("TAG", "url is null"); 
   } 
  } 
 } 
}

代码3：


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.ywhttpurlconnection"
 android:versionCode="1"
 android:versionName="1.0" >
 <uses-sdk android:minSdkVersion="10" />
 <uses-permission android:name="android.permission.INTERNET"/>
 <application
  android:icon="@drawable/ic_launcher"
  android:label="@string/app_name" >
  <activity
   android:label="@string/app_name"
   android:name=".YwhttpurlconnectionActivity" >
   <intent-filter >
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
   <activity android:name=".showdata"></activity> 
 </application>
</manifest>

代码4：http.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 <TextView
  android:id="@+id/TextView_HTTP"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  />
  <ImageView
  android:id="@+id/ImageView01"
  android:layout_width="172dp"
  android:layout_height="307dp" >
 </ImageView>
</LinearLayout>

代码5.mail.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical" >
 <TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/hello" />
  <Button android:text="直接获取数据" android:id="@+id/Button01" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content"> 
 </Button> 
 <Button android:text="GET方式传递" android:id="@+id/Button02" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content"> 
 </Button> 
 <Button android:text="POST方式传递" android:id="@+id/Button03" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content"> 
 </Button> 
 <Button android:text="获取图片" android:id="@+id/Button04" 
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content"> 
 </Button> 
</LinearLayout>

6.运行结果

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