1. instance a HttpURLConnection , by Url.openConnection(); url=new URL(String url);
2. get an inputstream from HttpURLConnection.getInputStream();
3. get a String or write the input stream to a File .
4. get SD card file directory in android: Environment.getExternalStorageDirectory() +"/" + "file_path/ file.format"
5. remember to close all streams when done;
6. set the android permission in android manifest , out of the application element;
<uses-permission android:name="android.permission.INTERNET"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
manifest file
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.httpDownloadTest"
android:versionCode="1"
android:versionName="1.0">
<application android:label="@string/app_name" >
<activity android:name="HttpDownloadTest"
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>
<uses-sdk android:minSdkVersion="4"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</manifest>
package com.httpDownloadTest;
import com.httpDownloadTest.utils.HttpDownloader;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class HttpDownloadTest extends Activity
{
private Button txtButt;
private Button mp3Butt;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtButt=(Button)this.findViewById(R.id.downloadTxt);
txtButt.setOnClickListener(txtLtn);
mp3Butt=(Button)this.findViewById(R.id.downloadMp3);
mp3Butt.setOnClickListener(mp3Ltn);
}
OnClickListener txtLtn=new OnClickListener(){
public void onClick(View arg0) {
// throw new UnsupportedOperationException("Not supported yet.");
HttpDownloader httpDownloader=new HttpDownloader();
String lrc=httpDownloader.download(
"http://www.9ilrc.com/lrc.php?id=35174&uid=2650");
Log.i("http_test", "lrc:"+lrc);
}
};
OnClickListener mp3Ltn=new OnClickListener(){
public void onClick(View arg0) {
// throw new UnsupportedOperationException("Not supported yet.");
HttpDownloader httpDownloader=new HttpDownloader();
int result=httpDownloader.download(
"http://61.187.150.39:9206/5D606B71829EBCFF6BF81C5D00B23FFCA5CB434B4D56D81B1EAB23E213078E1C26E857860586267A3EE62F7F0/zhangmenshiting.baidu.com/data2/music/19235087/19234007255600.mp3?xcode=d1c2f7d1629355f6da42e1f1a4fa697b",
"voa/",
"a1.mp3");
Log.i("http_test",result+"");
}
};
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.httpDownloadTest.utils;
import android.util.Log;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author Administrator
*/
public class HttpDownloader {
private URL url;
public String download(String urlStr){
StringBuffer sb=new StringBuffer();
String line;
BufferedReader buffer = null;
try {
url=new URL(urlStr);
HttpURLConnection urlConn=(HttpURLConnection) url.openConnection();
buffer=new BufferedReader(new InputStreamReader(urlConn.getInputStream()));
while((line=buffer.readLine())!=null){
Log.i("http_test","every line:"+line);
sb.append(line);
}
} catch (IOException ex) {
Log.i("http_test", "txt down load:"+ex.getMessage());
}
try {
buffer.close();
} catch (IOException ex) {
Log.i("http_test", ex.getMessage());
}
return sb.toString();
}
public int download(String url,String path,String fileName){
InputStream inputStream=null;
try{
FileUtil fileUtil=new FileUtil();
if(fileUtil.isFileExist(path+fileName)){
return 1;
}
else{
inputStream=getInputStreamFromUrl(url);
File resultFile=fileUtil.write2SDFormat(path, fileName, inputStream);
if(resultFile==null){
return -1;
}
}
}
catch(Exception e){
Log.i("http_test", "mp3 down load:"+e.getMessage());
return -1;
}
try {
inputStream.close();
} catch (IOException ex) {
Log.i("http_test", ex.getMessage());
}
return 0;
}
private InputStream getInputStreamFromUrl(String urlStr) throws IOException {
HttpURLConnection urlConn=null;
try {
URL url=new URL(urlStr);
urlConn=(HttpURLConnection)url.openConnection();
} catch (IOException ex) {
Log.i("http_test", ex.getMessage());
}
return urlConn.getInputStream();
};
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.httpDownloadTest.utils;
import android.os.Environment;
import android.util.Log;
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author Administrator
*/
public class FileUtil {
private String SD_PATH;
public String getSDPATH(){
return SD_PATH;
}
public FileUtil(){
SD_PATH=Environment.getExternalStorageDirectory()+"/";
Log.i("http_test", "sd_path:"+SD_PATH);
}
public File createSDFile(String fileName){
File file=null;
try {
file=new File(SD_PATH+fileName);
file.createNewFile();
} catch (IOException ex) {
Log.i("http_test", "file create error:"+ex.getMessage());
}
return file;
}
public File createSDDir(String dirName){
File dir=new File(SD_PATH+dirName);
dir.mkdir();
return dir;
}
public boolean isFileExist(String fileName){
File file=new File(fileName);
return file.exists();
}
public File write2SDFormat(String path,String fileName,InputStream input){
File file=null;
FileOutputStream output=null;
try {
createSDDir(path);
file=createSDFile(path+fileName);
output=new FileOutputStream(file);
byte[] buffer=new byte[4*1024];
while((input.read(buffer))!=-1){
output.write(buffer);
}
output.flush();
} catch (IOException ex) {
Log.i("http_test", "file write error:"+ex.getMessage());
}
try {
output.close();
} catch (IOException ex) {
Log.i("http_test", ex.getMessage());
}
return file;
}
}