Android开发之HTTP访问网络

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 {
 /** Called when the activity is first created. */

 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。