android通过网络下载文字和Mp3的例子

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。(简单吧)

废话不多说，上代码：

网络处理类 HttpDownloader.java

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;欠款

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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