android 下载程序
HttpDownloader 文件：
package zhou.demo.download;import java.io.BufferedReader;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;public class HttpDownloader { private URL url = null; public String download(String urlStr){ StringBuffer sb = new StringBuffer(); String line = null; BufferedReader buffer = null; try { url = new URL(urlStr); HttpURLConnection urlCon = (HttpURLConnection)url.openConnection(); buffer = new BufferedReader(new InputStreamReader(urlCon.getInputStream())); while((line = buffer.readLine()) != null){ sb.append(line); } } catch (Exception e) { e.printStackTrace(); }finally{ try { buffer.close(); } catch (Exception e2) { e2.printStackTrace(); } } return sb.toString(); } public int downFile(String urlStr, String path, String fileName){ InputStream inputStream = null; try { FileUtils fileUtils = new FileUtils(); if(fileUtils.isFileExist(path + fileName)){ return 1; }else{ inputStream = getInputStreamFromUrl(urlStr); File resultFile = fileUtils.write2SDFromInput(path, fileName, inputStream); if(resultFile == null){ return -1; } } } catch (Exception e) { e.printStackTrace(); return -1; }finally{ try { inputStream.close(); } catch (Exception e2) { e2.printStackTrace(); } } return 0; } /** * 根据URL得到输入流 * @throws IOException */ public InputStream getInputStreamFromUrl(String urlStr) throws IOException{ HttpURLConnection urlConn = (HttpURLConnection)url.openConnection(); InputStream inputStream = urlConn.getInputStream(); return inputStream; }}?
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package zhou.demo.download;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import android.os.Environment;public class FileUtils { private String SDPATH; public String getSDPATH(){ return SDPATH; } public FileUtils(){ //得到当前外部储存设备的目录 (***兼容写法***) SDPATH = Environment.getExternalStorageDirectory() + "/"; } public File createSDFile(String fileName) throws IOException{ File file = new File(SDPATH + fileName); file.createNewFile(); return file; } /** * 在SD上创建目录 * @param dirName * @return */ public File createSDDir(String dirName){ File dir = new File(SDPATH + dirName); dir.mkdir(); return dir; } /** * 判断SD上的文件夹是否存在 */ public boolean isFileExist(String fileName){ File file = new File(SDPATH + fileName); return file.exists(); } /** * 将数据传入SD里面 */ public File write2SDFromInput(String path, String fileName, InputStream input){ File file = null; OutputStream 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 (Exception e) { e.printStackTrace(); }finally{ try { output.close(); } catch (Exception e2) { // TODO: handle exception } } return file; }}??
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package zhou.demo.download;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class DownLoad extends Activity { private Button textButton; private Button mp3Button; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); textButton = (Button)this.findViewById(R.id.txt_button); mp3Button = (Button)this.findViewById(R.id.mp3_button); textButton.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-lgenerated method stub HttpDownloader httpDownloader = new HttpDownloader(); String lrc = httpDownloader.download("http://192.168.1.1:8060"); System.out.println(lrc); } }); mp3Button.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub HttpDownloader httpDownloader = new HttpDownloader(); int result = httpDownloader.downFile("http://mp3","voa/","a1.mp3"); System.out.println(result); } }); }}?布局文件
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Buttonandroid:id="@+id/txt_button"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/txt_button_name"/><Buttonandroid:id="@+id/mp3_button"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/mp3_button_name"/></LinearLayout>
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