android通过网络下载文字和Mp3的例子,androidmp3
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android通过网络下载文字和Mp3的例子,androidmp3
android通过网络下载文件分2步:
1.建立网络连接获取数据流;
2.创建文件把数据流写到文件中即可。
1.[文件] HttpDownloader.java~2KB 下载(275)
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.MalformedURLException; import java.net.URL; /*** * 通过http协议下载文件 * ***/ public class HttpDownloader { private URL url = null; public InputStream getInputStreamFormUrl(String urlStr) throws MalformedURLException,IOException{ url = new URL(urlStr); HttpURLConnection httpc = (HttpURLConnection)url.openConnection(); return httpc.getInputStream(); } public String downloadText(String urlStr){ StringBuffer sb = new StringBuffer(); String line = null; BufferedReader breader = null; try{ url = new URL(urlStr); HttpURLConnection httpc = (HttpURLConnection)url.openConnection(); InputStream inputs = httpc.getInputStream(); breader = new BufferedReader(new InputStreamReader(inputs)); while((line=breader.readLine())!=null){ sb.append(line); } }catch(Exception e){ e.printStackTrace(); }finally{ try { breader.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return sb.toString(); } public int downloadFile(String urlStr,String path,String name){ InputStream input = null; try{ FileUtils fu = new FileUtils(); if(fu.isFileExist(path+name)){ // 是否存在文件,如果存在返回1 return 1; }else{ input = getInputStreamFormUrl(urlStr); File f = fu.inputStream2File(path, name, input);软件开发 if(f==null){ return -1; // 数据有异常的时候返回-1 } input.close(); } }catch(Exception e){ e.printStackTrace(); return -1; } return 0; // 数据正常的时候返回0 } }
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